diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/ImageGenerators.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/ImageGenerators.java
index bbe7a85463d49da3a0641ebe1086900535722026..def4fbc887b886ef0abcce359c77e7b2ea308ba3 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/ImageGenerators.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/ImageGenerators.java
@@ -89,9 +89,11 @@ public class ImageGenerators {
 	 * @return {@link MimeType} of the generated object
 	 * @throws IOException
 	 *           thrown when there is a problem with output file
-	 * @throws DrawingException 
+	 * @throws DrawingException
+	 *           thrown when there is a problem drawing map
 	 */
-	public MimeType generate(Class<? extends AbstractImageGenerator> generatorClass, AbstractImageGenerator.Params params, String filename) throws IOException, DrawingException {
+	public MimeType generate(Class<? extends AbstractImageGenerator> generatorClass, AbstractImageGenerator.Params params, String filename)
+			throws IOException, DrawingException {
 		try {
 			AbstractImageGenerator generator = generatorClass.getConstructor(AbstractImageGenerator.Params.class).newInstance(params);
 			generator.saveToFile(filename);
@@ -125,7 +127,8 @@ public class ImageGenerators {
 	 * @return {@link MimeType} of the generated object
 	 * @throws IOException
 	 *           thrown when there is a problem with output file
-	 * @throws DrawingException 
+	 * @throws DrawingException
+	 *           thrown when there is a problem drawing map
 	 */
 	public MimeType generate(String generatorClass, Params params, String filename) throws IOException, DrawingException {
 		for (Pair<String, Class<? extends AbstractImageGenerator>> element : availableGenerators) {
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/BioEntityConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/BioEntityConverter.java
index 3c0969d891be604f9df1bd07431ce44885f34655..7f85a9f5e76f309a1d654980f0a0bfe83e6c0a80 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/BioEntityConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/BioEntityConverter.java
@@ -39,18 +39,23 @@ public abstract class BioEntityConverter<T extends BioEntity> {
 	 * Default class logger.
 	 */
 	@SuppressWarnings("unused")
-	private final Logger						 logger										= Logger.getLogger(BioEntityConverter.class);
+	private final Logger						 logger						= Logger.getLogger(BioEntityConverter.class);
 
+	/**
+	 * Class that allows to check if element is visible (or transparent) when
+	 * drawing. It's used to filter out invisible elements when drawing
+	 * semantic/hierarchy view.
+	 */
 	private SemanticZoomLevelMatcher zoomLevelMatcher	= new SemanticZoomLevelMatcher();
 
 	/**
 	 * Alpha value (0..255) used for visualizing overlay data that are normally
 	 * visualized in javascript.
 	 */
-	public static final int					 LAYOUT_ALPHA							= 200;
+	public static final int					 LAYOUT_ALPHA			= 200;
 
 	/**
-	 * This function draw representation of the alias on the graphics object.
+	 * This function draw {@link BioEntity} on the {@link Graphics2D} object.
 	 * 
 	 * @param bioEntity
 	 *          {@link BioEntity} that should be drawn
@@ -60,7 +65,8 @@ public abstract class BioEntityConverter<T extends BioEntity> {
 	 *          visuzalization params (like, should the object be filled with
 	 *          solid color, etc.), for more information see
 	 *          {@link ConverterParams}
-	 * @throws DrawingException 
+	 * @throws DrawingException
+	 *           thrown when there is a problem with drawing {@link BioEntity}
 	 * 
 	 */
 	public void draw(T bioEntity, Graphics2D graphics, ConverterParams params) throws DrawingException {
@@ -82,23 +88,25 @@ public abstract class BioEntityConverter<T extends BioEntity> {
 	 *          list of {@link ColorSchema} that were used for visualizing this
 	 *          bioentity in different data overlays that should be overlayed on
 	 *          the alias
-	 * @throws DrawingException 
+	 * @throws DrawingException
+	 *           thrown when there is a problem with drawing {@link BioEntity}
 	 * 
 	 */
-	public abstract void draw(T bioEntity, Graphics2D graphics, ConverterParams params, List<ColorSchema> visualizedOverlaysColorSchemas) throws DrawingException;
+	public abstract void draw(T bioEntity, Graphics2D graphics, ConverterParams params, List<ColorSchema> visualizedOverlaysColorSchemas)
+			throws DrawingException;
 
 	/**
 	 * This function will find proper font size to display text within it. Then it
 	 * will print this text.
 	 * 
 	 * @param bioEntity
-	 *          bioEntity with description to be drawn
+	 *          {@link BioEntity} with description to be drawn
 	 * @param graphics
 	 *          where the description should be drawn
 	 * @param params
 	 *          parameters of visualization (centering, scale)
 	 * @throws DrawingException
-	 *           thrown when there is a problem with drawing bioEntity
+	 *           thrown when there is a problem with drawing {@link BioEntity}
 	 */
 	public abstract void drawText(T bioEntity, Graphics2D graphics, ConverterParams params) throws DrawingException;
 
@@ -186,6 +194,17 @@ public abstract class BioEntityConverter<T extends BioEntity> {
 		return true;
 	}
 
+	/**
+	 * Checks if {@link Element} given in the argument is transparent accordind to
+	 * the level given in the {@link ConverterParams}.
+	 * 
+	 * @param bioEntity
+	 *          {@link BioEntity} to be checked
+	 * @param params
+	 *          params against which check is run
+	 * @return <code>true</code> if object is transparent, <code>false</code>
+	 *         otherwise
+	 */
 	protected boolean isTransparent(Element bioEntity, ConverterParams params) {
 		return zoomLevelMatcher.isTransparent(params.getLevel(), bioEntity.getTransparencyLevel());
 	}
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/BottomSquareCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/BottomSquareCompartmentConverter.java
index b2af327cf2453121bd80963f61a6a657b3bb54ec..862cdb82efa56b106a3f560cb038e447d77adf4a 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/BottomSquareCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/BottomSquareCompartmentConverter.java
@@ -9,16 +9,15 @@ import java.awt.geom.Line2D;
 import java.awt.geom.Point2D;
 import java.awt.geom.Rectangle2D;
 
+import org.apache.log4j.Logger;
+
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.graphics.LineType;
 import lcsb.mapviewer.model.map.compartment.BottomSquareCompartment;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
-import org.apache.log4j.Logger;
-
 /**
  * Class responsible for drawing BottomSquareCompartment on the Graphics2D.
  * 
@@ -31,7 +30,7 @@ public class BottomSquareCompartmentConverter extends CompartmentConverter<Botto
 	 * Default class logger.
 	 */
 	@SuppressWarnings("unused")
-	private static Logger	logger	= Logger.getLogger(BottomSquareCompartmentConverter.class.getName());
+	private static Logger logger = Logger.getLogger(BottomSquareCompartmentConverter.class.getName());
 
 	/**
 	 * Default constructor.
@@ -45,24 +44,24 @@ public class BottomSquareCompartmentConverter extends CompartmentConverter<Botto
 	}
 
 	@Override
-	public void draw(final BottomSquareCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final BottomSquareCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		// keep the old values of colors and line
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
 		// create shape of the compartment
-		Shape s1 = new Line2D.Double(0, alias.getY(), alias.getWidth(), alias.getY());
-		Shape s3 = new Line2D.Double(0, alias.getY() + alias.getThickness(), alias.getWidth(), alias.getY() + alias.getThickness());
-		Area a1 = new Area(new Rectangle2D.Double(0.0, alias.getY(), alias.getWidth(), alias.getHeight()));
+		Shape s1 = new Line2D.Double(0, compartment.getY(), compartment.getWidth(), compartment.getY());
+		Shape s3 = new Line2D.Double(0, compartment.getY() + compartment.getThickness(), compartment.getWidth(), compartment.getY() + compartment.getThickness());
+		Area a1 = new Area(new Rectangle2D.Double(0.0, compartment.getY(), compartment.getWidth(), compartment.getHeight()));
 
-		Color c1 = alias.getColor();
+		Color c1 = compartment.getColor();
 		Color c2 = new Color(c1.getRed(), c1.getGreen(), c1.getBlue(), HIGH_ALPHA_LEVEL);
 		if (c1.equals(Color.WHITE)) {
 			c1 = Color.BLACK;
 		}
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(c1);
 		} else {
@@ -87,10 +86,10 @@ public class BottomSquareCompartmentConverter extends CompartmentConverter<Botto
 
 		// draw description
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		}
 	}
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/CompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/CompartmentConverter.java
index 4db51f040bdcc18e9b7636c5d3abf9c386def466..2221b5a5d7acac56a3492111056ef1bf19917165 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/CompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/CompartmentConverter.java
@@ -9,7 +9,6 @@ import java.util.List;
 import org.apache.log4j.Logger;
 
 import lcsb.mapviewer.commands.ColorExtractor;
-import lcsb.mapviewer.commands.SemanticZoomLevelMatcher;
 import lcsb.mapviewer.common.Configuration;
 import lcsb.mapviewer.common.exception.InvalidArgumentException;
 import lcsb.mapviewer.common.geometry.EllipseTransformation;
@@ -99,32 +98,33 @@ public abstract class CompartmentConverter<T extends Compartment> extends Elemen
 	};
 
 	@Override
-	public void drawText(final T alias, final Graphics2D graphics, final ConverterParams params) {
-		if (alias.getWidth() < Configuration.EPSILON || alias.getHeight() < Configuration.EPSILON) {
+	public void drawText(final T compartment, final Graphics2D graphics, final ConverterParams params) {
+		if (compartment.getWidth() < Configuration.EPSILON || compartment.getHeight() < Configuration.EPSILON) {
 			throw new InvalidArgumentException(
-					"Dimension of the alias must be bigger than 0. Alias id: " + alias.getElementId() + " (name: \"" + alias.getName() + "\")");
+					"Dimension of the alias must be bigger than 0. Alias id: " + compartment.getElementId() + " (name: \"" + compartment.getName() + "\")");
 		}
-		Rectangle2D border = alias.getBorder();
-		if (isVisible(alias, params) && !isTransparent(alias, params)) {
+		Rectangle2D border = compartment.getBorder();
+		if (isVisible(compartment, params) && !isTransparent(compartment, params)) {
 			synchronized (placeFinderSynchronization) {
-				if (placeFinder == null || placeFinder.getModel() != alias.getModelData()) {
-					placeFinder = new PlaceFinder(alias.getModelData().getModel());
+				if (placeFinder == null || placeFinder.getModel() != compartment.getModelData()) {
+					placeFinder = new PlaceFinder(compartment.getModelData().getModel());
 				}
-				border = placeFinder.getRetangle(alias, params.getLevel());
+				border = placeFinder.getRetangle(compartment, params.getLevel());
 			}
 		} else if (!params.isTextCentered()) {
 			border = new Rectangle2D.Double(
-					alias.getNamePoint().getX(), alias.getNamePoint().getY(), alias.getWidth() - (alias.getNamePoint().getX() - alias.getX()),
-					alias.getHeight() - (alias.getNamePoint().getY() - alias.getY()));
+					compartment.getNamePoint().getX(), compartment.getNamePoint().getY(),
+					compartment.getWidth() - (compartment.getNamePoint().getX() - compartment.getX()),
+					compartment.getHeight() - (compartment.getNamePoint().getY() - compartment.getY()));
 		}
 		double fontSize = DEFAULT_FONT_SIZE * params.getScale();
-		if (alias.getFontSize() != null) {
-			fontSize = alias.getFontSize() * params.getScale();
+		if (compartment.getFontSize() != null) {
+			fontSize = compartment.getFontSize() * params.getScale();
 		}
 		String fontName = Font.SANS_SERIF;
 		try {
-			fontSize = FontFinder.findMaxFontSize((int) Math.round(fontSize), fontName, graphics, border, alias.getName());
-			FontFinder.drawText((int) fontSize, fontName, graphics, border, alias.getName(), params.isTextCentered());
+			fontSize = FontFinder.findMaxFontSize((int) Math.round(fontSize), fontName, graphics, border, compartment.getName());
+			FontFinder.drawText((int) fontSize, fontName, graphics, border, compartment.getName(), params.isTextCentered());
 		} catch (RectangleTooSmallException e) {
 			// if it's too small then don't draw
 			return;
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/LeftSquareCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/LeftSquareCompartmentConverter.java
index e6767a608f602797e282f952b321c19f302e23d9..cacd7fa860b2fac75d447b62ccac7d998e12cb46 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/LeftSquareCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/LeftSquareCompartmentConverter.java
@@ -44,24 +44,25 @@ public class LeftSquareCompartmentConverter extends CompartmentConverter<LeftSqu
 	}
 
 	@Override
-	public void draw(final LeftSquareCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final LeftSquareCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		// keep the old values of color and line type
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
 		// create shape of the compartment
-		Shape s1 = new Line2D.Double(alias.getWidth(), alias.getHeight(), alias.getWidth(), 0);
-		Shape s3 = new Line2D.Double(alias.getWidth() - alias.getThickness(), 0, alias.getWidth() - alias.getThickness(), alias.getHeight());
-		Area a1 = new Area(new Rectangle2D.Double(0.0, 0.0, alias.getWidth(), alias.getHeight()));
+		Shape s1 = new Line2D.Double(compartment.getWidth(), compartment.getHeight(), compartment.getWidth(), 0);
+		Shape s3 = new Line2D.Double(
+				compartment.getWidth() - compartment.getThickness(), 0, compartment.getWidth() - compartment.getThickness(), compartment.getHeight());
+		Area a1 = new Area(new Rectangle2D.Double(0.0, 0.0, compartment.getWidth(), compartment.getHeight()));
 
-		Color c1 = alias.getColor();
+		Color c1 = compartment.getColor();
 		Color c2 = new Color(c1.getRed(), c1.getGreen(), c1.getBlue(), HIGH_ALPHA_LEVEL);
 		if (c1.equals(Color.WHITE)) {
 			c1 = Color.BLACK;
 		}
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(c1);
 		} else {
@@ -87,10 +88,10 @@ public class LeftSquareCompartmentConverter extends CompartmentConverter<LeftSqu
 
 		// draw description
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		}
 	}
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/OvalCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/OvalCompartmentConverter.java
index ea5a579a5aad3c38e683933a718782a2bf05d708..94bf3c470241e0fe1c5c09feeaef1c03c3be91a2 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/OvalCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/OvalCompartmentConverter.java
@@ -11,9 +11,9 @@ import java.awt.geom.Point2D;
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.graphics.LineType;
+import lcsb.mapviewer.model.map.compartment.Compartment;
 import lcsb.mapviewer.model.map.compartment.OvalCompartment;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
@@ -38,27 +38,27 @@ public class OvalCompartmentConverter extends CompartmentConverter<OvalCompartme
 	/**
 	 * Returns shape representing alias.
 	 * 
-	 * @param alias
+	 * @param compartment
 	 *          alias for which we are looking for a Shape
 	 * @return Shape object that represents alias
 	 */
-	private Shape getShape(final Element alias) {
-		return new Ellipse2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight());
+	private Shape getShape(final Compartment compartment) {
+		return new Ellipse2D.Double(compartment.getX(), compartment.getY(), compartment.getWidth(), compartment.getHeight());
 	}
 
 	@Override
-	public void draw(final OvalCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final OvalCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		// keep the old values of color and line type
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
 		// create shape of the compartment
-		Shape s1 = getShape(alias);
-		alias.increaseBorder(-alias.getThickness());
-		Shape s3 = getShape(alias);
-		alias.increaseBorder(alias.getThickness());
+		Shape s1 = getShape(compartment);
+		compartment.increaseBorder(-compartment.getThickness());
+		Shape s3 = getShape(compartment);
+		compartment.increaseBorder(compartment.getThickness());
 
-		Color c1 = alias.getColor();
+		Color c1 = compartment.getColor();
 		Color c2 = new Color(c1.getRed(), c1.getGreen(), c1.getBlue(), HIGH_ALPHA_LEVEL);
 		if (c1.equals(Color.WHITE)) {
 			c1 = Color.BLACK;
@@ -68,7 +68,7 @@ public class OvalCompartmentConverter extends CompartmentConverter<OvalCompartme
 		a1.subtract(new Area(s3));
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(c1);
 		} else {
@@ -92,13 +92,13 @@ public class OvalCompartmentConverter extends CompartmentConverter<OvalCompartme
 
 		// draw description
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		} else {
-			if (!alias.containsIdenticalSpecies()) {
-				drawText(alias, graphics, params);
+			if (!compartment.containsIdenticalSpecies()) {
+				drawText(compartment, graphics, params);
 			}
 		}
 	}
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/PathwayCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/PathwayCompartmentConverter.java
index b9ff85306fdb47ea1c2eee4576774e348a14cd24..fb3518522110b69d730092da16c54e940b3063e1 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/PathwayCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/PathwayCompartmentConverter.java
@@ -40,17 +40,17 @@ public class PathwayCompartmentConverter extends CompartmentConverter<PathwayCom
 	private Color backgroundColor = Color.LIGHT_GRAY;
 
 	@Override
-	public void draw(final PathwayCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final PathwayCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		// keep the old values of colors and line
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
-		Shape shape = new Rectangle2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight());
+		Shape shape = new Rectangle2D.Double(compartment.getX(), compartment.getY(), compartment.getWidth(), compartment.getHeight());
 
-		Color color = alias.getColor();
+		Color color = compartment.getColor();
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(backgroundColor);
 		} else {
@@ -70,13 +70,13 @@ public class PathwayCompartmentConverter extends CompartmentConverter<PathwayCom
 
 		// draw description of the compartment
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		} else {
-			if (!alias.containsIdenticalSpecies()) {
-				drawText(alias, graphics, params);
+			if (!compartment.containsIdenticalSpecies()) {
+				drawText(compartment, graphics, params);
 			}
 		}
 	}
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/RightSquareCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/RightSquareCompartmentConverter.java
index 92303a36f88bcc4bcc0008c1bdb270693a1f9f90..a9461ebb57a23f986f6502d192abbe30f10ad1ea 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/RightSquareCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/RightSquareCompartmentConverter.java
@@ -44,24 +44,24 @@ public class RightSquareCompartmentConverter extends CompartmentConverter<RightS
 	}
 
 	@Override
-	public void draw(final RightSquareCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final RightSquareCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		// keep the old values of color and line type
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
 		// create shape of the compartment
-		Shape s1 = new Line2D.Double(alias.getX(), alias.getHeight(), alias.getX(), 0);
-		Shape s3 = new Line2D.Double(alias.getX() + alias.getThickness(), alias.getHeight(), alias.getX(), 0);
-		Area a1 = new Area(new Rectangle2D.Double(alias.getX(), 0.0, alias.getWidth(), alias.getHeight()));
+		Shape s1 = new Line2D.Double(compartment.getX(), compartment.getHeight(), compartment.getX(), 0);
+		Shape s3 = new Line2D.Double(compartment.getX() + compartment.getThickness(), compartment.getHeight(), compartment.getX(), 0);
+		Area a1 = new Area(new Rectangle2D.Double(compartment.getX(), 0.0, compartment.getWidth(), compartment.getHeight()));
 
-		Color c1 = alias.getColor();
+		Color c1 = compartment.getColor();
 		Color c2 = new Color(c1.getRed(), c1.getGreen(), c1.getBlue(), HIGH_ALPHA_LEVEL);
 		if (c1.equals(Color.WHITE)) {
 			c1 = Color.BLACK;
 		}
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(c1);
 		} else {
@@ -85,18 +85,18 @@ public class RightSquareCompartmentConverter extends CompartmentConverter<RightS
 		graphics.setStroke(oldStroke);
 
 		// three lines below are only temporary fix...
-		double x = alias.getNamePoint().getX() - alias.getX();
-		double y = alias.getNamePoint().getY();
-		alias.getNamePoint().setLocation(x, y);
+		double x = compartment.getNamePoint().getX() - compartment.getX();
+		double y = compartment.getNamePoint().getY();
+		compartment.getNamePoint().setLocation(x, y);
 
 		// draw description
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		}
-		x += alias.getX();
-		alias.getNamePoint().setLocation(x, y);
+		x += compartment.getX();
+		compartment.getNamePoint().setLocation(x, y);
 	}
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/SquareCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/SquareCompartmentConverter.java
index c19e0deb0c9fd9a2abf9735ff134fa4eee39c168..2cd4017c5eaefa760d42456e522be50c03cdf9e2 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/SquareCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/SquareCompartmentConverter.java
@@ -13,13 +13,13 @@ import org.apache.log4j.Logger;
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.graphics.LineType;
+import lcsb.mapviewer.model.map.compartment.Compartment;
 import lcsb.mapviewer.model.map.compartment.SquareCompartment;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
- * Class responsible for drawing SquareCompartment on the Graphics2D.
+ * Class responsible for drawing SquareCompartment on the {@link Graphics2D}.
  * 
  * @author Piotr Gawron
  * 
@@ -48,29 +48,30 @@ public class SquareCompartmentConverter extends CompartmentConverter<SquareCompa
 	}
 
 	/**
-	 * Returns shape representing alias.
+	 * Returns shape representing compartment.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a Shape
-	 * @return Shape object that represents alias
+	 * @param compartment
+	 *          compartment for which we are looking for a {@link Shape}
+	 * @return {@link Shape} object that represents compartment
 	 */
-	private Shape getShape(final Element alias) {
-		return new RoundRectangle2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight(), RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE);
+	private Shape getShape(final Compartment compartment) {
+		return new RoundRectangle2D.Double(
+				compartment.getX(), compartment.getY(), compartment.getWidth(), compartment.getHeight(), RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE);
 	}
 
 	@Override
-	public void draw(final SquareCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final SquareCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		// keep the old values of color and line type
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
 		// create shape of the compartment
-		Shape s1 = getShape(alias);
-		alias.increaseBorder(-alias.getThickness());
-		Shape s3 = getShape(alias);
-		alias.increaseBorder(alias.getThickness());
+		Shape s1 = getShape(compartment);
+		compartment.increaseBorder(-compartment.getThickness());
+		Shape s3 = getShape(compartment);
+		compartment.increaseBorder(compartment.getThickness());
 
-		Color c1 = alias.getColor();
+		Color c1 = compartment.getColor();
 		Color c2 = new Color(c1.getRed(), c1.getGreen(), c1.getBlue(), HIGH_ALPHA_LEVEL);
 		if (c1.equals(Color.WHITE)) {
 			c1 = Color.BLACK;
@@ -80,7 +81,7 @@ public class SquareCompartmentConverter extends CompartmentConverter<SquareCompa
 		a1.subtract(new Area(s3));
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(c1);
 		} else {
@@ -104,10 +105,10 @@ public class SquareCompartmentConverter extends CompartmentConverter<SquareCompa
 
 		// draw description
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		}
 	}
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/TopSquareCompartmentConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/TopSquareCompartmentConverter.java
index 33a325562f0c7fc4322b2083f7ea13b4166f9ffa..7832bd282364731c4245f950f3e5959ff1ea4a01 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/TopSquareCompartmentConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/compartment/TopSquareCompartmentConverter.java
@@ -19,7 +19,7 @@ import lcsb.mapviewer.model.map.species.Species;
 import org.apache.log4j.Logger;
 
 /**
- * Class responsible for drawing TopSquareCompartment on the Graphics2D.
+ * Class responsible for drawing TopSquareCompartment on the {@link Graphics2D}.
  * 
  * @author Piotr Gawron
  * 
@@ -44,22 +44,23 @@ public class TopSquareCompartmentConverter extends CompartmentConverter<TopSquar
 	}
 
 	@Override
-	public void draw(final TopSquareCompartment alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final TopSquareCompartment compartment, final Graphics2D graphics, final ConverterParams params) {
 		Color oldColor = graphics.getColor();
 		Stroke oldStroke = graphics.getStroke();
 
-		Shape s1 = new Line2D.Double(0, alias.getHeight(), alias.getWidth(), alias.getHeight());
-		Shape s3 = new Line2D.Double(0, alias.getHeight() - alias.getThickness(), alias.getWidth(), alias.getHeight() - alias.getThickness());
-		Area a1 = new Area(new Rectangle2D.Double(0.0, 0.0, alias.getWidth(), alias.getHeight()));
+		Shape s1 = new Line2D.Double(0, compartment.getHeight(), compartment.getWidth(), compartment.getHeight());
+		Shape s3 = new Line2D.Double(
+				0, compartment.getHeight() - compartment.getThickness(), compartment.getWidth(), compartment.getHeight() - compartment.getThickness());
+		Area a1 = new Area(new Rectangle2D.Double(0.0, 0.0, compartment.getWidth(), compartment.getHeight()));
 
-		Color c1 = alias.getColor();
+		Color c1 = compartment.getColor();
 		Color c2 = new Color(c1.getRed(), c1.getGreen(), c1.getBlue(), HIGH_ALPHA_LEVEL);
 		if (c1.equals(Color.WHITE)) {
 			c1 = Color.BLACK;
 		}
 
 		// fill the background
-		boolean fill = !isTransparent(alias, params);
+		boolean fill = !isTransparent(compartment, params);
 		if (fill) {
 			graphics.setColor(c1);
 		} else {
@@ -83,10 +84,10 @@ public class TopSquareCompartmentConverter extends CompartmentConverter<TopSquar
 		graphics.setStroke(oldStroke);
 		// draw description
 		if (fill) {
-			Point2D tmpPoint = alias.getNamePoint();
-			alias.setNamePoint(alias.getCenter());
-			drawText(alias, graphics, params);
-			alias.setNamePoint(tmpPoint);
+			Point2D tmpPoint = compartment.getNamePoint();
+			compartment.setNamePoint(compartment.getCenter());
+			drawText(compartment, graphics, params);
+			compartment.setNamePoint(tmpPoint);
 		}
 	}
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/AntisenseRnaConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/AntisenseRnaConverter.java
index 84d00dc02a8c969fcc03de52697d7d17a7f988cb..f8b7777cdc7a41ecf1397b49f59c5ff9c86d61e8 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/AntisenseRnaConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/AntisenseRnaConverter.java
@@ -15,16 +15,15 @@ import org.apache.log4j.Logger;
 
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
-import lcsb.mapviewer.model.map.species.Element;
-import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
 import lcsb.mapviewer.model.map.species.AntisenseRna;
+import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.species.field.AntisenseRnaRegion;
 import lcsb.mapviewer.model.map.species.field.ModificationState;
 
 /**
- * This class defines methods used for drawing Antisense Rna SpeciesAlias on the
- * graphics2d object.
+ * This class defines methods used for drawing {@link AntisenseRna} on the
+ * {@link Graphics2D} object.
  * 
  * @author Piotr Gawron
  * 
@@ -48,40 +47,39 @@ public class AntisenseRnaConverter extends SpeciesConverter<AntisenseRna> {
 		super(colorExtractor);
 	}
 
-
 	@Override
-	public void draw(final AntisenseRna alias, final Graphics2D graphics, final ConverterParams params) {
-		GeneralPath path = getAntisenseRnaPath(alias);
+	public void draw(final AntisenseRna antisenseRna, final Graphics2D graphics, final ConverterParams params) {
+		GeneralPath path = getAntisenseRnaPath(antisenseRna);
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(antisenseRna.getColor());
 		graphics.fill(path);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(antisenseRna));
 		graphics.draw(path);
 		graphics.setStroke(stroke);
 
-		for (AntisenseRnaRegion mr : alias.getRegions()) {
-			drawRegion(alias, mr, graphics, false, false);
+		for (AntisenseRnaRegion mr : antisenseRna.getRegions()) {
+			drawRegion(antisenseRna, mr, graphics, false, false);
 		}
 
-		drawText(alias, graphics, params);
+		drawText(antisenseRna, graphics, params);
 	}
 
 	/**
-	 * Returns alias border as a GeneralPath object.
+	 * Returns {@link AntisenseRna} border as a {@link GeneralPath} object.
 	 * 
-	 * @param alias
-	 *          alias for which we want to get border
-	 * @return border of the alias
+	 * @param antisenseRna
+	 *          {@link AntisenseRna} for which we want to get border
+	 * @return border of the {@link AntisenseRna}
 	 */
-	private GeneralPath getAntisenseRnaPath(final Element alias) {
+	private GeneralPath getAntisenseRnaPath(final AntisenseRna antisenseRna) {
 		// CHECKSTYLE:OFF
 		GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD, 4);
-		path.moveTo(alias.getX(), alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth() * 3 / 4, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX() + alias.getWidth() / 4, alias.getY() + alias.getHeight());
+		path.moveTo(antisenseRna.getX(), antisenseRna.getY());
+		path.lineTo(antisenseRna.getX() + antisenseRna.getWidth() * 3 / 4, antisenseRna.getY());
+		path.lineTo(antisenseRna.getX() + antisenseRna.getWidth(), antisenseRna.getY() + antisenseRna.getHeight());
+		path.lineTo(antisenseRna.getX() + antisenseRna.getWidth() / 4, antisenseRna.getY() + antisenseRna.getHeight());
 		// CHECKSTYLE:ON
 		path.closePath();
 		return path;
@@ -95,33 +93,33 @@ public class AntisenseRnaConverter extends SpeciesConverter<AntisenseRna> {
 	/**
 	 * This method draws antisense rna region for given alias.
 	 * 
-	 * @param alias
-	 *          alias on which region should be drawn
-	 * @param mr
-	 *          region to be drawn
+	 * @param antisenseRna
+	 *          {@link AntisenseRna} on which region should be drawn
+	 * @param region
+	 *          {@link AntisenseRnaRegion} to be drawn
 	 * @param graphics
-	 *          graphics where we draw region
+	 *          {@link Graphics2D} where we draw region
 	 * @param drawEmptyRegion
 	 *          flag determining if we shoudl draw empty regions
 	 * @param drawDescription
 	 *          flag determining if we want to draw description as well
 	 */
-	private void drawRegion(final AntisenseRna alias, final AntisenseRnaRegion mr, final Graphics2D graphics, final boolean drawEmptyRegion,
+	private void drawRegion(final AntisenseRna antisenseRna, final AntisenseRnaRegion region, final Graphics2D graphics, final boolean drawEmptyRegion,
 			final boolean drawDescription) {
-		if ((!drawEmptyRegion) && (mr.getState() == null)) {
+		if ((!drawEmptyRegion) && (region.getState() == null)) {
 			return;
 		}
 		double diameter = DEFAULT_MODIFICATION_DIAMETER;
 
-		double x = alias.getX();
-		double y = alias.getY();
+		double x = antisenseRna.getX();
+		double y = antisenseRna.getY();
 
-		double width = alias.getWidth();
+		double width = antisenseRna.getWidth();
 
 		// CHECKSTYLE:OFF
 		// we draw modifier on the upper border of antisense rna (which is only in
 		// 3/4 of the width of alias)
-		Point2D p = new Point2D.Double(x + width * 3.0 / 4.0 * mr.getPos(), y - diameter);
+		Point2D p = new Point2D.Double(x + width * 3.0 / 4.0 * region.getPos(), y - diameter);
 		// CHECKSTYLE:ON
 
 		Ellipse2D ellipse = new Ellipse2D.Double(p.getX() - diameter / 2, p.getY() - diameter / 2, diameter, diameter);
@@ -132,13 +130,13 @@ public class AntisenseRnaConverter extends SpeciesConverter<AntisenseRna> {
 		graphics.draw(ellipse);
 		graphics.drawLine((int) p.getX(), (int) (p.getY() + diameter / 2), (int) p.getX(), (int) y);
 
-		String text = mr.getName();
+		String text = region.getName();
 		if (!text.equals("") && drawDescription) {
 			double textWidth = graphics.getFontMetrics().stringWidth(text);
 			Point2D p2 = new Point2D.Double(p.getX() - textWidth / 2, p.getY() - DEFAULT_SPECIES_MODIFIER_FONT_SIZE);
 			graphics.drawString(text, (int) p2.getX(), (int) p2.getY());
 		}
-		ModificationState state = mr.getState();
+		ModificationState state = region.getState();
 		if (state != null) {
 			String str = state.getAbbreviation();
 			Font tmpFont = graphics.getFont();
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ComplexConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ComplexConverter.java
index 760c24e23e7f3975de8e0221491e489576ad5b20..2fa74bcc721df4921075d13d89df47699f43c564 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ComplexConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ComplexConverter.java
@@ -12,15 +12,13 @@ import java.awt.geom.PathIterator;
 import org.apache.log4j.Logger;
 
 import lcsb.mapviewer.commands.ColorExtractor;
-import lcsb.mapviewer.commands.SemanticZoomLevelMatcher;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.converter.graphics.geometry.FontFinder;
 import lcsb.mapviewer.converter.graphics.geometry.RectangleTooSmallException;
 import lcsb.mapviewer.model.graphics.LineType;
-import lcsb.mapviewer.model.map.species.Element;
-import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
 import lcsb.mapviewer.model.map.species.Complex;
+import lcsb.mapviewer.model.map.species.Species;
 
 /**
  * This class defines methods used for drawing ComplexAlias on the graphics2d
@@ -143,50 +141,50 @@ public class ComplexConverter extends SpeciesConverter<Complex> {
 	}
 
 	@Override
-	public void drawText(final Complex alias, final Graphics2D graphics, final ConverterParams params) {
-		if (((Complex) alias).getElements().size() > 0) {
-			if (isTransparent(alias, params)) {
-				super.drawText(alias, graphics, params);
+	public void drawText(final Complex complex, final Graphics2D graphics, final ConverterParams params) {
+		if (complex.getElements().size() > 0) {
+			if (isTransparent(complex, params)) {
+				super.drawText(complex, graphics, params);
 				return;
 			}
 		}
-		String text = getText(alias);
+		String text = getText(complex);
 		try {
 			double fontSize = DEFAULT_SPECIES_FONT_SIZE;
-			if (alias.getFontSize() != null) {
-				fontSize = alias.getFontSize();
+			if (complex.getFontSize() != null) {
+				fontSize = complex.getFontSize();
 			}
-			int size = (int) FontFinder.findMaxFontSize(params.getScale() * fontSize, Font.SANS_SERIF, graphics, alias.getBorder(), text);
-			FontFinder.drawText(size, Font.SANS_SERIF, graphics, alias.getBorder(), text);
+			int size = (int) FontFinder.findMaxFontSize(params.getScale() * fontSize, Font.SANS_SERIF, graphics, complex.getBorder(), text);
+			FontFinder.drawText(size, Font.SANS_SERIF, graphics, complex.getBorder(), text);
 		} catch (RectangleTooSmallException e) {
 			logger.warn("Problem with finding font size", e);
-			super.drawText(alias, graphics, params);
+			super.drawText(complex, graphics, params);
 		}
 	}
 
 	/**
-	 * Returns the border of complex alias.
+	 * Returns the border of {@link Complex}.
 	 * 
-	 * @param alias
+	 * @param complex
 	 *          exact object for which we want to get a border
-	 * @return border of the alias
+	 * @return border of the {@link Complex}
 	 */
-	private GeneralPath getAliasPath(final Element alias) {
+	private GeneralPath getAliasPath(final Complex complex) {
 		GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD);
-		path.moveTo(alias.getX() + TRIMMED_CORNER_SIZE, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth() - TRIMMED_CORNER_SIZE, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY() + TRIMMED_CORNER_SIZE);
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY() + alias.getHeight() - TRIMMED_CORNER_SIZE);
-		path.lineTo(alias.getX() + alias.getWidth() - TRIMMED_CORNER_SIZE, alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX() + TRIMMED_CORNER_SIZE, alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX(), alias.getY() + alias.getHeight() - TRIMMED_CORNER_SIZE);
-		path.lineTo(alias.getX(), alias.getY() + TRIMMED_CORNER_SIZE);
+		path.moveTo(complex.getX() + TRIMMED_CORNER_SIZE, complex.getY());
+		path.lineTo(complex.getX() + complex.getWidth() - TRIMMED_CORNER_SIZE, complex.getY());
+		path.lineTo(complex.getX() + complex.getWidth(), complex.getY() + TRIMMED_CORNER_SIZE);
+		path.lineTo(complex.getX() + complex.getWidth(), complex.getY() + complex.getHeight() - TRIMMED_CORNER_SIZE);
+		path.lineTo(complex.getX() + complex.getWidth() - TRIMMED_CORNER_SIZE, complex.getY() + complex.getHeight());
+		path.lineTo(complex.getX() + TRIMMED_CORNER_SIZE, complex.getY() + complex.getHeight());
+		path.lineTo(complex.getX(), complex.getY() + complex.getHeight() - TRIMMED_CORNER_SIZE);
+		path.lineTo(complex.getX(), complex.getY() + TRIMMED_CORNER_SIZE);
 		path.closePath();
 		return path;
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(final Complex alias) {
-		return getAliasPath(alias).getPathIterator(new AffineTransform());
+	public PathIterator getBoundPathIterator(final Complex complex) {
+		return getAliasPath(complex).getPathIterator(new AffineTransform());
 	}
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DegradedConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DegradedConverter.java
index 42152ef9f1c518e85485ab9c268049202831b667..2b8c6d163a165b366e4a93d36dd316f69263d822 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DegradedConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DegradedConverter.java
@@ -16,12 +16,11 @@ import lcsb.mapviewer.common.exception.InvalidStateException;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
 import lcsb.mapviewer.model.map.species.Degraded;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
- * This class defines methods used for drawing Degraded SpeciesAlias on the
- * graphics2d object.
+ * This class defines methods used for drawing {@link Degraded} on the
+ * {@link Graphics2D} object.
  * 
  * @author Piotr Gawron
  * 
@@ -50,17 +49,17 @@ public class DegradedConverter extends SpeciesConverter<Degraded> {
 	}
 
 	@Override
-	public void draw(final Degraded alias, final Graphics2D graphics, final ConverterParams params) {
-		double diameter = getDiameter(alias);
-		double x = getXCoord(alias, diameter);
-		double y = getYCoord(alias);
+	public void draw(final Degraded degraded, final Graphics2D graphics, final ConverterParams params) {
+		double diameter = getDiameter(degraded);
+		double x = getXCoord(degraded, diameter);
+		double y = getYCoord(degraded);
 		Area a1 = new Area(new Ellipse2D.Double(x, y, diameter, diameter));
 
-		double lineX1 = alias.getX() + alias.getWidth() / 2 + CROSS_LINE_EXTENDED_LENGTH;
-		double lineY1 = alias.getY();
+		double lineX1 = degraded.getX() + degraded.getWidth() / 2 + CROSS_LINE_EXTENDED_LENGTH;
+		double lineY1 = degraded.getY();
 
-		double lineX2 = alias.getX() + alias.getWidth() / 2 - CROSS_LINE_EXTENDED_LENGTH;
-		double lineY2 = alias.getY() + diameter + 2 * CROSS_LINE_EXTENDED_LENGTH;
+		double lineX2 = degraded.getX() + degraded.getWidth() / 2 - CROSS_LINE_EXTENDED_LENGTH;
+		double lineY2 = degraded.getY() + diameter + 2 * CROSS_LINE_EXTENDED_LENGTH;
 
 		GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD, 2);
 		path.moveTo(lineX1, lineY1);
@@ -71,51 +70,51 @@ public class DegradedConverter extends SpeciesConverter<Degraded> {
 
 		a1.exclusiveOr(new Area(path));
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(degraded.getColor());
 		graphics.fill(a1);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(degraded));
 		graphics.draw(a1);
 		graphics.setStroke(stroke);
-		drawText(alias, graphics, params);
+		drawText(degraded, graphics, params);
 	}
 
 	/**
-	 * Returns transformed y coordinate for the degraded alias.
+	 * Returns transformed y coordinate for the {@link Degraded} bioentity.
 	 * 
-	 * @param alias
-	 *          object alias to to which we are looking for y coordinate
+	 * @param degraded
+	 *          {@link Degraded} to to which we are looking for y coordinate
 	 * @return y coordinate of the alias
 	 */
-	private double getYCoord(final Element alias) {
-		double y = alias.getY() + CROSS_LINE_EXTENDED_LENGTH;
+	private double getYCoord(final Degraded degraded) {
+		double y = degraded.getY() + CROSS_LINE_EXTENDED_LENGTH;
 		return y;
 	}
 
 	/**
 	 * Returns transformed x coordinate for the degraded alias.
 	 * 
-	 * @param alias
+	 * @param degraded
 	 *          object alias to to which we are looking for x coordinate
 	 * @param diameter
 	 *          diameter of cross line used in this alias
-	 * @return x coordinate of the alias
+	 * @return x coordinate of the {@link Degraded} bioentity.
 	 */
-	private double getXCoord(final Element alias, final double diameter) {
-		double x = alias.getX() + (alias.getWidth() - diameter) / 2;
+	private double getXCoord(final Degraded degraded, final double diameter) {
+		double x = degraded.getX() + (degraded.getWidth() - diameter) / 2;
 		return x;
 	}
 
 	/**
 	 * Computes diameter of cross line for the degraded alias.
 	 * 
-	 * @param alias
+	 * @param degraded
 	 *          object alias to to which we are looking for diameter.
 	 * @return diameter of the cross line
 	 */
-	private double getDiameter(final Element alias) {
-		double diameter = Math.min(alias.getWidth(), alias.getHeight()) - 2 * CROSS_LINE_EXTENDED_LENGTH;
+	private double getDiameter(final Degraded degraded) {
+		double diameter = Math.min(degraded.getWidth(), degraded.getHeight()) - 2 * CROSS_LINE_EXTENDED_LENGTH;
 		if (diameter < 0) {
 			logger.warn("Diameter cannot be negative...");
 			diameter = 0;
@@ -124,12 +123,12 @@ public class DegradedConverter extends SpeciesConverter<Degraded> {
 	}
 
 	@Override
-	public String getText(Degraded alias) {
+	public String getText(Degraded degraded) {
 		return "";
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(Degraded alias) {
+	public PathIterator getBoundPathIterator(Degraded degraded) {
 		throw new InvalidStateException("This class doesn't have bound");
 	}
 
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DrugConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DrugConverter.java
index 4c412634f46f78414c63f1a7426463cd1aaeb92d..8765dd6e30dc0e71b8bac1382537e92fa97d0a77 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DrugConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/DrugConverter.java
@@ -10,15 +10,14 @@ import java.awt.geom.Point2D;
 import java.awt.geom.RoundRectangle2D;
 import java.util.ArrayList;
 
+import org.apache.log4j.Logger;
+
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
 import lcsb.mapviewer.model.map.species.Drug;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
-import org.apache.log4j.Logger;
-
 /**
  * This class defines methods used for drawing Drug SpeciesAlias on the
  * graphics2d object.
@@ -27,23 +26,23 @@ import org.apache.log4j.Logger;
  * 
  */
 public class DrugConverter extends SpeciesConverter<Drug> {
-	
+
 	/**
 	 * Distance between internal and external border of drug graphical
 	 * representation.
 	 */
-	private static final int	OFFSET_BETWEEN_BORDERS		= 4;
-	
+	private static final int OFFSET_BETWEEN_BORDERS		 = 4;
+
 	/**
 	 * How big should be the arc in rectangle for drug representation.
 	 */
-	private static final int	RECTANGLE_CORNER_ARC_SIZE	= 40;
-	
+	private static final int RECTANGLE_CORNER_ARC_SIZE = 40;
+
 	/**
 	 * Default class logger.
 	 */
 	@SuppressWarnings("unused")
-	private static Logger			logger										= Logger.getLogger(DrugConverter.class.getName());
+	private static Logger		 logger										 = Logger.getLogger(DrugConverter.class.getName());
 
 	/**
 	 * Default constructor.
@@ -59,47 +58,47 @@ public class DrugConverter extends SpeciesConverter<Drug> {
 	/**
 	 * Returns shape of the Drug .
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
+	 * @param drug
+	 *          {@link Drug} for which we are looking for a border
 	 * @return Shape object defining given alias
 	 */
-	private Shape getDrugShape(final Element alias) {
-		return new RoundRectangle2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight(), RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE);
+	private Shape getDrugShape(final Drug drug) {
+		return new RoundRectangle2D.Double(drug.getX(), drug.getY(), drug.getWidth(), drug.getHeight(), RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE);
 	}
 
 	@Override
-	public void draw(Drug alias, final Graphics2D graphics, final ConverterParams params) {
-		Shape a1 = getDrugShape(alias);
+	public void draw(Drug drug, final Graphics2D graphics, final ConverterParams params) {
+		Shape a1 = getDrugShape(drug);
 		double offset = OFFSET_BETWEEN_BORDERS;
 		Shape a2 = new RoundRectangle2D.Double(
-				alias.getX() + offset, alias.getY() + offset, alias.getWidth() - 2 * offset, alias.getHeight() - 2 * offset, RECTANGLE_CORNER_ARC_SIZE,
+				drug.getX() + offset, drug.getY() + offset, drug.getWidth() - 2 * offset, drug.getHeight() - 2 * offset, RECTANGLE_CORNER_ARC_SIZE,
 				RECTANGLE_CORNER_ARC_SIZE);
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(drug.getColor());
 		graphics.fill(a1);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(drug));
 		graphics.draw(a1);
 		graphics.draw(a2);
 		graphics.setStroke(stroke);
-		drawText(alias, graphics, params);
+		drawText(drug, graphics, params);
 	}
 
 	/**
-	 * Returns shape of the Drug as a list of points.
+	 * Returns shape of the {@link Drug} as a list of points.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
-	 * @return list of points defining border of the given alias
+	 * @param drug
+	 *          {@link Drug} for which we are looking for a border
+	 * @return list of points defining border of the given {@link Drug}
 	 */
-	protected ArrayList<Point2D> getDrugPoints(final Species alias) {
+	protected ArrayList<Point2D> getDrugPoints(final Drug drug) {
 		ArrayList<Point2D> list = new ArrayList<Point2D>();
 
-		double x = alias.getX();
-		double y = alias.getY();
-		double width = alias.getWidth();
-		double height = alias.getHeight();
+		double x = drug.getX();
+		double y = drug.getY();
+		double width = drug.getWidth();
+		double height = drug.getHeight();
 
 		// CHECKSTYLE:OFF
 		list.add(new Point2D.Double(x, y + height / 2));
@@ -116,8 +115,8 @@ public class DrugConverter extends SpeciesConverter<Drug> {
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(Drug alias) {
-		return getDrugShape(alias).getPathIterator(new AffineTransform());
+	public PathIterator getBoundPathIterator(Drug drug) {
+		return getDrugShape(drug).getPathIterator(new AffineTransform());
 	}
 
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/GeneConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/GeneConverter.java
index 514475cf86205411fc334f3dc88b411aecde5443..8528b749fca21bab36324abe8e66c7d5f29cb16e 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/GeneConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/GeneConverter.java
@@ -16,7 +16,6 @@ import org.apache.log4j.Logger;
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Gene;
 import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.species.field.ModificationResidue;
@@ -48,22 +47,22 @@ public class GeneConverter extends SpeciesConverter<Gene> {
 	}
 
 	@Override
-	public void draw(final Gene alias, final Graphics2D graphics, final ConverterParams params) {
-		Shape shape = getGeneShape(alias);
+	public void draw(final Gene gene, final Graphics2D graphics, final ConverterParams params) {
+		Shape shape = getGeneShape(gene);
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(gene.getColor());
 		graphics.fill(shape);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(gene));
 		graphics.draw(shape);
 		graphics.setStroke(stroke);
 
-		for (ModificationResidue mr : alias.getModificationResidues()) {
-			drawModification(alias, mr, graphics, false, false);
+		for (ModificationResidue mr : gene.getModificationResidues()) {
+			drawModification(gene, mr, graphics, false, false);
 		}
 
-		drawText(alias, graphics, params);
+		drawText(gene, graphics, params);
 	}
 
 	/**
@@ -72,7 +71,7 @@ public class GeneConverter extends SpeciesConverter<Gene> {
 	 * set then also description (position) of the modification is drawn on the
 	 * canvas.
 	 * 
-	 * @param alias
+	 * @param gene
 	 *          object that is 'parent' of the residue
 	 * @param mr
 	 *          modification to be drawn
@@ -84,17 +83,17 @@ public class GeneConverter extends SpeciesConverter<Gene> {
 	 *          flag that indicates if we should draw description of the
 	 *          modification
 	 */
-	private void drawModification(final Gene alias, final ModificationResidue mr, final Graphics2D graphics, final boolean drawEmptyModification,
+	private void drawModification(final Gene gene, final ModificationResidue mr, final Graphics2D graphics, final boolean drawEmptyModification,
 			final boolean drawDescription) {
 		if ((!drawEmptyModification) && (mr.getState() == null)) {
 			return;
 		}
 		double diameter = DEFAULT_MODIFICATION_DIAMETER;
 
-		double x = alias.getX();
-		double y = alias.getY();
+		double x = gene.getX();
+		double y = gene.getY();
 
-		double width = alias.getWidth();
+		double width = gene.getWidth();
 
 		Point2D p = new Point2D.Double(x + width * mr.getAngle(), y - DEFAULT_MODIFICATION_DIAMETER);
 
@@ -126,21 +125,21 @@ public class GeneConverter extends SpeciesConverter<Gene> {
 	}
 
 	/**
-	 * Shape representation of the gene alias.
+	 * Shape representation of the {@link Gene}.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a Shape
-	 * @return Shape object that represents alias
+	 * @param gene
+	 *          {@link Gene} for which we are looking for a {@link Shape}
+	 * @return {@link Shape} that represents {@link Gene}
 	 */
-	private Shape getGeneShape(final Element alias) {
+	private Shape getGeneShape(final Gene gene) {
 		Shape shape;
-		shape = new Rectangle(alias.getX().intValue(), alias.getY().intValue(), alias.getWidth().intValue(), alias.getHeight().intValue());
+		shape = new Rectangle(gene.getX().intValue(), gene.getY().intValue(), gene.getWidth().intValue(), gene.getHeight().intValue());
 		return shape;
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(final Gene alias) {
-		return getGeneShape(alias).getPathIterator(new AffineTransform());
+	public PathIterator getBoundPathIterator(final Gene gene) {
+		return getGeneShape(gene).getPathIterator(new AffineTransform());
 	}
 
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/IonConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/IonConverter.java
index 733f3b7ddb0dcf1f165360352c9e603854b8db3f..6b0237b7498984c0ee2b5f301a2b725a9fcb8c18 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/IonConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/IonConverter.java
@@ -14,14 +14,12 @@ import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.common.exception.InvalidStateException;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Ion;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
- * This class defines methods used for drawing SpeciesAlias of
- * {@link lcsb.mapviewer.converter.model.celldesigner.structure.db.model.map.species.Ion
- * Ion} on the {@link Graphics2D} object.
+ * This class defines methods used for drawing SpeciesAlias of {@link Ion} on
+ * the {@link Graphics2D} object.
  * 
  * @author Piotr Gawron
  * 
@@ -45,57 +43,57 @@ public class IonConverter extends SpeciesConverter<Ion> {
 	}
 
 	@Override
-	public void draw(Ion alias, final Graphics2D graphics, final ConverterParams params) {
-		double diameter = getDiameter(alias);
-		double x = getXCoord(alias, diameter);
-		double y = getYCoord(alias);
+	public void draw(Ion ion, final Graphics2D graphics, final ConverterParams params) {
+		double diameter = getDiameter(ion);
+		double x = getXCoord(ion, diameter);
+		double y = getYCoord(ion);
 		Shape shape = new Ellipse2D.Double(x, y, diameter, diameter);
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(ion.getColor());
 		graphics.fill(shape);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(ion));
 		graphics.draw(shape);
 		graphics.setStroke(stroke);
-		drawText(alias, graphics, params);
+		drawText(ion, graphics, params);
 	}
 
 	/**
-	 * Returns transformed y coordinate for the ion alias.
+	 * Returns transformed y coordinate for the {@link Ion}.
 	 * 
-	 * @param alias
-	 *          object alias to to which we are looking for y coordinate
-	 * @return y coordinate of the alias
+	 * @param ion
+	 *          {@link Ion} to to which we are looking for y coordinate
+	 * @return y coordinate of the {@link Ion}
 	 */
-	private double getYCoord(final Element alias) {
-		double y = alias.getY();
+	private double getYCoord(final Ion ion) {
+		double y = ion.getY();
 		return y;
 	}
 
 	/**
-	 * Returns transformed x coordinate for the ion alias.
+	 * Returns transformed x coordinate for the {@link Ion}.
 	 * 
-	 * @param alias
-	 *          object alias to to which we are looking for x coordinate
+	 * @param ion
+	 *          {@link Ion} to which we are looking for x coordinate
 	 * @param diameter
 	 *          diameter of circle representation of ion
-	 * @return x coordinate of the alias
+	 * @return x coordinate of the {@link Ion}
 	 */
-	private double getXCoord(final Element alias, final double diameter) {
-		double x = alias.getX() + (alias.getWidth() - diameter) / 2;
+	private double getXCoord(final Ion ion, final double diameter) {
+		double x = ion.getX() + (ion.getWidth() - diameter) / 2;
 		return x;
 	}
 
 	/**
-	 * Returns diameter of circle representation of ion.
+	 * Returns diameter of circle representation of an {@link Ion}.
 	 * 
-	 * @param alias
-	 *          object alias to to which we are looking for diameter.
-	 * @return diameter of ion circle representation
+	 * @param ion
+	 *          {@link Ion} to to which we are looking for diameter.
+	 * @return diameter of {@link Ion} circle representation
 	 */
-	private double getDiameter(final Element alias) {
-		double diameter = Math.min(alias.getWidth(), alias.getHeight());
+	private double getDiameter(final Ion ion) {
+		double diameter = Math.min(ion.getWidth(), ion.getHeight());
 		if (diameter < 0) {
 			logger.warn("Something is wrong. Size cannot be negative");
 			diameter = 0;
@@ -105,19 +103,19 @@ public class IonConverter extends SpeciesConverter<Ion> {
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(Ion alias) {
+	public PathIterator getBoundPathIterator(Ion ion) {
 		throw new InvalidStateException("This class doesn't have bound");
 	}
 
 	@Override
-	public Point2D getPointCoordinatesOnBorder(Ion alias, final double angle) {
-		if (alias.getWidth() == 0 && alias.getHeight() == 0) {
+	public Point2D getPointCoordinatesOnBorder(Ion ion, final double angle) {
+		if (ion.getWidth() == 0 && ion.getHeight() == 0) {
 			logger.warn("Looking for coordinates for the alias with 0 size");
-			return alias.getCenter();
+			return ion.getCenter();
 		}
-		double diameter = getDiameter(alias);
-		double x = getXCoord(alias, diameter);
-		double y = getYCoord(alias);
+		double diameter = getDiameter(ion);
+		double x = getXCoord(ion, diameter);
+		double y = getYCoord(ion);
 		Point2D result = getEllipseTransformation().getPointOnEllipseByRadian(x, y, diameter, diameter, angle);
 		return result;
 
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/PhenotypeConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/PhenotypeConverter.java
index 0a6a2a059b9bd3d4cf9024797bd17d88c112b949..b9674dc86420941f54ea81233b83f62ddafda7d5 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/PhenotypeConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/PhenotypeConverter.java
@@ -13,13 +13,11 @@ import org.apache.log4j.Logger;
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Phenotype;
 
 /**
- * This class defines methods used for drawing SpeciesAlias of
- * {@link lcsb.mapviewer.converter.model.celldesigner.structure.db.model.map.species.Phenotype
- * Phenotype} on the {@link Graphics2D} object.
+ * This class defines methods used for drawing SpeciesAlias of {@link Phenotype}
+ * on the {@link Graphics2D} object.
  * 
  * @author Piotr Gawron
  * 
@@ -44,44 +42,45 @@ public class PhenotypeConverter extends SpeciesConverter<Phenotype> {
 	}
 
 	@Override
-	public void draw(Phenotype alias, final Graphics2D graphics, final ConverterParams params) {
-		GeneralPath path = getPhenotypePath(alias);
+	public void draw(Phenotype phenotype, final Graphics2D graphics, final ConverterParams params) {
+		GeneralPath path = getPhenotypePath(phenotype);
 
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(phenotype.getColor());
 		graphics.fill(path);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(phenotype));
 		graphics.draw(path);
 		graphics.setStroke(stroke);
-		drawText(alias, graphics, params);
+		drawText(phenotype, graphics, params);
 	}
 
 	/**
-	 * Returns shape of the Phenotype as a GeneralPath object.
+	 * Returns shape of the {@link Phenotype} as a {@link GeneralPath} object.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
-	 * @return GeneralPath object defining border of the given alias
+	 * @param phenotype
+	 *          {@link Phenotype} for which we are looking for a border
+	 * @return {@link GeneralPath} object defining border of the given
+	 *         {@link Phenotype}
 	 */
-	private GeneralPath getPhenotypePath(final Element alias) {
+	private GeneralPath getPhenotypePath(final Phenotype phenotype) {
 		// CHECKSTYLE:OFF
 		GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD, 6);
-		path.moveTo(alias.getX() + alias.getWidth() / 6, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth() * 5 / 6, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY() + alias.getHeight() / 2);
-		path.lineTo(alias.getX() + alias.getWidth() * 5 / 6, alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX() + alias.getWidth() / 6, alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX(), alias.getY() + alias.getHeight() / 2);
+		path.moveTo(phenotype.getX() + phenotype.getWidth() / 6, phenotype.getY());
+		path.lineTo(phenotype.getX() + phenotype.getWidth() * 5 / 6, phenotype.getY());
+		path.lineTo(phenotype.getX() + phenotype.getWidth(), phenotype.getY() + phenotype.getHeight() / 2);
+		path.lineTo(phenotype.getX() + phenotype.getWidth() * 5 / 6, phenotype.getY() + phenotype.getHeight());
+		path.lineTo(phenotype.getX() + phenotype.getWidth() / 6, phenotype.getY() + phenotype.getHeight());
+		path.lineTo(phenotype.getX(), phenotype.getY() + phenotype.getHeight() / 2);
 		// CHECKSTYLE:ON
 		path.closePath();
 		return path;
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(Phenotype alias) {
-		return getPhenotypePath(alias).getPathIterator(new AffineTransform());
+	public PathIterator getBoundPathIterator(Phenotype phenotype) {
+		return getPhenotypePath(phenotype).getPathIterator(new AffineTransform());
 	}
 
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ProteinConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ProteinConverter.java
index 0e794ffa6e425ca2af04a2a9d87c185b3728ebb3..0f97b3998052c234e8602675ece715111de38352 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ProteinConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/ProteinConverter.java
@@ -23,7 +23,6 @@ import lcsb.mapviewer.common.exception.InvalidStateException;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.graphics.LineType;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.GenericProtein;
 import lcsb.mapviewer.model.map.species.IonChannelProtein;
 import lcsb.mapviewer.model.map.species.Protein;
@@ -47,6 +46,7 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	 * Width of the ion part in the open channel representation.
 	 */
 	private static final int ION_CHANNEL_WIDTH				 = 20;
+
 	/**
 	 * Width of the gap in the open channel representation.
 	 */
@@ -56,6 +56,7 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	 * How big should be the arc in rectangle for protein representation.
 	 */
 	private static final int RECTANGLE_CORNER_ARC_SIZE = 10;
+
 	/**
 	 * Default class logger.
 	 */
@@ -78,29 +79,30 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	}
 
 	/**
-	 * Returns shape of generic protein.
+	 * Returns shape of {@link Protein}.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
+	 * @param protein
+	 *          {@link Protein} for which we are looking for a border
 	 * @return Shape object defining given alias
 	 */
-	private Shape getGenericShape(final Element alias) {
-		return new RoundRectangle2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight(), RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE);
+	private Shape getGenericShape(final Protein protein) {
+		return new RoundRectangle2D.Double(
+				protein.getX(), protein.getY(), protein.getWidth(), protein.getHeight(), RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE);
 	}
 
 	@Override
-	public void draw(final Protein alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final Protein protein, final Graphics2D graphics, final ConverterParams params) {
 		// Local variable setting the SBGN visualization
 		boolean sbgnFormat = params.isSbgnFormat();
 
 		// Unit of information text (multimer cardinality and/or ion channel's
 		// state)
 		String unitOfInformationText = "";
-		if (alias.getStatePrefix() != null && alias.getStateLabel() != null) {
-			if (alias.getStatePrefix().equals("free input")) {
-				unitOfInformationText = alias.getStateLabel();
+		if (protein.getStatePrefix() != null && protein.getStateLabel() != null) {
+			if (protein.getStatePrefix().equals("free input")) {
+				unitOfInformationText = protein.getStateLabel();
 			} else {
-				unitOfInformationText = alias.getStatePrefix() + ":" + alias.getStateLabel();
+				unitOfInformationText = protein.getStatePrefix() + ":" + protein.getStateLabel();
 			}
 		}
 
@@ -108,88 +110,88 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 		if (sbgnFormat) {
 			// If the SBGN display mode is set, multimer is shown as two stacked
 			// glyphs
-			if (alias.getHomodimer() > 1) {
+			if (protein.getHomodimer() > 1) {
 				homodir = 2;
 			} else {
 				homodir = 1;
 			}
 		} else {
-			homodir = alias.getHomodimer();
+			homodir = protein.getHomodimer();
 		}
 
-		alias.setWidth(alias.getWidth() - SpeciesConverter.HOMODIMER_OFFSET * (alias.getHomodimer() - 1));
-		alias.setHeight(alias.getHeight() - SpeciesConverter.HOMODIMER_OFFSET * (alias.getHomodimer() - 1));
+		protein.setWidth(protein.getWidth() - SpeciesConverter.HOMODIMER_OFFSET * (protein.getHomodimer() - 1));
+		protein.setHeight(protein.getHeight() - SpeciesConverter.HOMODIMER_OFFSET * (protein.getHomodimer() - 1));
 
-		alias.setX(alias.getX() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
-		alias.setY(alias.getY() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
+		protein.setX(protein.getX() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
+		protein.setY(protein.getY() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
 
 		for (int homodimerId = 0; homodimerId < homodir; homodimerId++) {
-			alias.setX(alias.getX() - SpeciesConverter.HOMODIMER_OFFSET);
-			alias.setY(alias.getY() - SpeciesConverter.HOMODIMER_OFFSET);
+			protein.setX(protein.getX() - SpeciesConverter.HOMODIMER_OFFSET);
+			protein.setY(protein.getY() - SpeciesConverter.HOMODIMER_OFFSET);
 
 			Shape shape = null;
-			if (alias instanceof GenericProtein || sbgnFormat) {
-				shape = getGenericShape(alias);
-				if (alias.getActivity() && !sbgnFormat) {
-					drawActivityGenericProtein(alias, graphics);
+			if (protein instanceof GenericProtein || sbgnFormat) {
+				shape = getGenericShape(protein);
+				if (protein.getActivity() && !sbgnFormat) {
+					drawActivityGenericProtein(protein, graphics);
 				}
-			} else if (alias instanceof IonChannelProtein) {
+			} else if (protein instanceof IonChannelProtein) {
 				Area a1;
-				if (!alias.getActivity()) {
+				if (!protein.getActivity()) {
 					a1 = new Area(
 							new RoundRectangle2D.Double(
-									alias.getX(), alias.getY(), alias.getWidth() - ION_CHANNEL_WIDTH - 1, alias.getHeight(), RECTANGLE_CORNER_ARC_SIZE,
+									protein.getX(), protein.getY(), protein.getWidth() - ION_CHANNEL_WIDTH - 1, protein.getHeight(), RECTANGLE_CORNER_ARC_SIZE,
 									RECTANGLE_CORNER_ARC_SIZE));
 				} else {
 					a1 = new Area(
 							new RoundRectangle2D.Double(
-									alias.getX(), alias.getY(), alias.getWidth() - ION_CHANNEL_WIDTH - OPEN_ION_CHANNEL_WIDTH - 1, alias.getHeight(), RECTANGLE_CORNER_ARC_SIZE,
-									RECTANGLE_CORNER_ARC_SIZE));
+									protein.getX(), protein.getY(), protein.getWidth() - ION_CHANNEL_WIDTH - OPEN_ION_CHANNEL_WIDTH - 1, protein.getHeight(),
+									RECTANGLE_CORNER_ARC_SIZE, RECTANGLE_CORNER_ARC_SIZE));
 				}
 				Area a2 = new Area(
 						new RoundRectangle2D.Double(
-								alias.getX() + alias.getWidth() - ION_CHANNEL_WIDTH, alias.getY(), ION_CHANNEL_WIDTH, alias.getHeight(), RECTANGLE_CORNER_ARC_SIZE,
+								protein.getX() + protein.getWidth() - ION_CHANNEL_WIDTH, protein.getY(), ION_CHANNEL_WIDTH, protein.getHeight(), RECTANGLE_CORNER_ARC_SIZE,
 								RECTANGLE_CORNER_ARC_SIZE));
 				a1.add(a2);
 				shape = a1;
-			} else if (alias instanceof TruncatedProtein) {
-				shape = getTruncatedShape(alias);
-				if (alias.getActivity()) {
-					drawActivityTruncatedShape(alias, graphics);
+			} else if (protein instanceof TruncatedProtein) {
+				shape = getTruncatedShape(protein);
+				if (protein.getActivity()) {
+					drawActivityTruncatedShape(protein, graphics);
 				}
-			} else if (alias instanceof ReceptorProtein) {
-				shape = getReceptorShape(alias);
-				if (alias.getActivity()) {
-					drawActivityReceptorProtein(alias, graphics);
+			} else if (protein instanceof ReceptorProtein) {
+				shape = getReceptorShape(protein);
+				if (protein.getActivity()) {
+					drawActivityReceptorProtein(protein, graphics);
 				}
 			} else {
-				logger.warn(eu.getElementTag(alias) + "Unknown shape for protein");
-				shape = getDefaultAliasShape(alias);
+				logger.warn(eu.getElementTag(protein) + "Unknown shape for protein");
+				shape = getDefaultAliasShape(protein);
 			}
 			Color c = graphics.getColor();
-			graphics.setColor(alias.getColor());
+			graphics.setColor(protein.getColor());
 			graphics.fill(shape);
 			graphics.setColor(c);
 			Stroke stroke = graphics.getStroke();
-			graphics.setStroke(getBorderLine(alias));
+			graphics.setStroke(getBorderLine(protein));
 			graphics.draw(shape);
 			graphics.setStroke(stroke);
 
 			// SBGN display mode - units of information and state variables are
 			// printed on the top element only
 			if (!sbgnFormat || (homodimerId == homodir - 1)) {
-				for (ModificationResidue mr : alias.getModificationResidues()) {
+				for (ModificationResidue mr : protein.getModificationResidues()) {
 					// SBGN display mode - print empty state variables
-					drawModification(alias, mr, graphics, sbgnFormat, false);
+					drawModification(protein, mr, graphics, sbgnFormat, false);
 				}
 				if (sbgnFormat) {
 					// SBGN display mode - ion channel's state is marked as a unit of
 					// information
-					if (alias instanceof IonChannelProtein) {
+					if (protein instanceof IonChannelProtein) {
 						if (!unitOfInformationText.equals("")) {
 							unitOfInformationText = unitOfInformationText.concat("; ");
 						}
-						if (alias.getActivity()) {
+						if (protein.getActivity()) {
 							unitOfInformationText = unitOfInformationText.concat("open");
 						} else {
 							unitOfInformationText = unitOfInformationText.concat("closed");
@@ -202,7 +204,7 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 						if (!unitOfInformationText.equals("")) {
 							unitOfInformationText = unitOfInformationText.concat("; ");
 						}
-						unitOfInformationText = unitOfInformationText.concat("N:").concat(Integer.toString(alias.getHomodimer()));
+						unitOfInformationText = unitOfInformationText.concat("N:").concat(Integer.toString(protein.getHomodimer()));
 					}
 				}
 			}
@@ -212,81 +214,81 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 			unitOfInformationText = null;
 		}
 
-		String text = alias.getStructuralState();
-		drawStructuralState(text, alias, graphics);
-		drawUnitOfInformation(unitOfInformationText, alias, graphics);
-		drawText(alias, graphics, params);
-		alias.setWidth(alias.getWidth() + SpeciesConverter.HOMODIMER_OFFSET * (alias.getHomodimer() - 1));
-		alias.setHeight(alias.getHeight() + SpeciesConverter.HOMODIMER_OFFSET * (alias.getHomodimer() - 1));
+		String text = protein.getStructuralState();
+		drawStructuralState(text, protein, graphics);
+		drawUnitOfInformation(unitOfInformationText, protein, graphics);
+		drawText(protein, graphics, params);
+		protein.setWidth(protein.getWidth() + SpeciesConverter.HOMODIMER_OFFSET * (protein.getHomodimer() - 1));
+		protein.setHeight(protein.getHeight() + SpeciesConverter.HOMODIMER_OFFSET * (protein.getHomodimer() - 1));
 	}
 
 	/**
 	 * Draws activity border of {@link GenericProtein}.
 	 * 
-	 * @param alias
-	 *          {@link Species} that will be drawn
+	 * @param protein
+	 *          {@link Protein} that will be drawn
 	 * @param graphics
 	 *          where we are drawing
 	 */
-	private void drawActivityGenericProtein(final Protein alias, final Graphics2D graphics) {
+	private void drawActivityGenericProtein(final Protein protein, final Graphics2D graphics) {
 		int border = ACTIVITY_BORDER_DISTANCE;
-		alias.increaseBorder(border);
-		Shape shape2 = getGenericShape(alias);
+		protein.increaseBorder(border);
+		Shape shape2 = getGenericShape(protein);
 		Stroke stroke = graphics.getStroke();
 		graphics.setStroke(LineType.DOTTED.getStroke());
 		graphics.draw(shape2);
 		graphics.setStroke(stroke);
-		alias.increaseBorder(-border);
+		protein.increaseBorder(-border);
 	}
 
 	/**
 	 * Draws activity border of {@link ReceptorProtein}.
 	 * 
-	 * @param alias
-	 *          {@link Species} that will be drawn
+	 * @param protein
+	 *          {@link Protein} that will be drawn
 	 * @param graphics
 	 *          where we are drawing
 	 */
-	public void drawActivityReceptorProtein(final Protein alias, final Graphics2D graphics) {
+	public void drawActivityReceptorProtein(final Protein protein, final Graphics2D graphics) {
 		int border = ACTIVITY_BORDER_DISTANCE;
-		alias.setX(alias.getX() - border);
-		alias.setY(alias.getY() - border);
-		alias.setWidth(alias.getWidth() + border * 2);
-		alias.setHeight(alias.getHeight() + border * 2);
-		Shape shape2 = getReceptorShape(alias);
+		protein.setX(protein.getX() - border);
+		protein.setY(protein.getY() - border);
+		protein.setWidth(protein.getWidth() + border * 2);
+		protein.setHeight(protein.getHeight() + border * 2);
+		Shape shape2 = getReceptorShape(protein);
 		Stroke stroke = graphics.getStroke();
 		graphics.setStroke(LineType.DOTTED.getStroke());
 		graphics.draw(shape2);
 		graphics.setStroke(stroke);
-		alias.setX(alias.getX() + border);
-		alias.setY(alias.getY() + border);
-		alias.setWidth(alias.getWidth() - border * 2);
-		alias.setHeight(alias.getHeight() - border * 2);
+		protein.setX(protein.getX() + border);
+		protein.setY(protein.getY() + border);
+		protein.setWidth(protein.getWidth() - border * 2);
+		protein.setHeight(protein.getHeight() - border * 2);
 	}
 
 	/**
 	 * Draws activity border of {@link TruncatedProtein}.
 	 * 
-	 * @param alias
-	 *          {@link Species} that will be drawn
+	 * @param protein
+	 *          {@link Protein} that will be drawn
 	 * @param graphics
 	 *          where we are drawing
 	 */
-	public void drawActivityTruncatedShape(final Protein alias, final Graphics2D graphics) {
+	public void drawActivityTruncatedShape(final Protein protein, final Graphics2D graphics) {
 		int border = ACTIVITY_BORDER_DISTANCE;
-		alias.setX(alias.getX() - border);
-		alias.setY(alias.getY() - border);
-		alias.setWidth(alias.getWidth() + border * 2);
-		alias.setHeight(alias.getHeight() + border * 2);
-		Shape shape2 = getTruncatedShape(alias);
+		protein.setX(protein.getX() - border);
+		protein.setY(protein.getY() - border);
+		protein.setWidth(protein.getWidth() + border * 2);
+		protein.setHeight(protein.getHeight() + border * 2);
+		Shape shape2 = getTruncatedShape(protein);
 		Stroke stroke = graphics.getStroke();
 		graphics.setStroke(LineType.DOTTED.getStroke());
 		graphics.draw(shape2);
 		graphics.setStroke(stroke);
-		alias.setX(alias.getX() + border);
-		alias.setY(alias.getY() + border);
-		alias.setWidth(alias.getWidth() - border * 2);
-		alias.setHeight(alias.getHeight() - border * 2);
+		protein.setX(protein.getX() + border);
+		protein.setY(protein.getY() + border);
+		protein.setWidth(protein.getWidth() - border * 2);
+		protein.setHeight(protein.getHeight() - border * 2);
 	}
 
 	/**
@@ -295,7 +297,7 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	 * set then also description (position) of the modification is drawn on the
 	 * canvas.
 	 * 
-	 * @param alias
+	 * @param protein
 	 *          object that is 'parent' of the residue
 	 * @param mr
 	 *          modification to be drawn
@@ -307,7 +309,7 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	 *          flag that indicates if we should draw description of the
 	 *          modification
 	 */
-	private void drawModification(final Protein alias, final ModificationResidue mr, final Graphics2D graphics, final boolean drawEmptyModification,
+	private void drawModification(final Protein protein, final ModificationResidue mr, final Graphics2D graphics, final boolean drawEmptyModification,
 			final boolean drawDescription) {
 		if ((!drawEmptyModification) && (mr.getState() == null)) {
 			return;
@@ -321,7 +323,7 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 			angle -= Math.PI * 2;
 		}
 
-		Point2D p = getResidueCoordinates(alias, mr.getAngle());
+		Point2D p = getResidueCoordinates(protein, mr.getAngle());
 		Ellipse2D ellipse = new Ellipse2D.Double(p.getX() - diameter / 2, p.getY() - diameter / 2, diameter, diameter);
 		Color c = graphics.getColor();
 		graphics.setColor(Color.WHITE);
@@ -332,9 +334,9 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 		String text = mr.getName();
 		if (!text.equals("") && drawDescription) {
 
-			alias.increaseBorder(-diameter / 2);
-			Point2D p2 = getResidueCoordinates(alias, mr.getAngle());
-			alias.increaseBorder(diameter / 2);
+			protein.increaseBorder(-diameter / 2);
+			Point2D p2 = getResidueCoordinates(protein, mr.getAngle());
+			protein.increaseBorder(diameter / 2);
 
 			double width = graphics.getFontMetrics().stringWidth(text);
 			double height = graphics.getFontMetrics().getHeight();
@@ -368,14 +370,14 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	/**
 	 * Returns shape of receptor protein.
 	 * 
-	 * @param alias
+	 * @param protein
 	 *          alias for which we are looking for a border
 	 * @return Shape object defining given alias
 	 */
-	protected Shape getReceptorShape(final Element alias) {
+	protected Shape getReceptorShape(final Protein protein) {
 		Shape shape;
 		GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD);
-		ArrayList<Point2D> points = getReceptorPoints(alias);
+		ArrayList<Point2D> points = getReceptorPoints(protein);
 		path.moveTo(points.get(0).getX(), points.get(0).getY());
 		for (int i = 1; i < points.size(); i++) {
 			path.lineTo(points.get(i).getX(), points.get(i).getY());
@@ -388,25 +390,25 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	/**
 	 * Returns shape of truncated protein.
 	 * 
-	 * @param alias
+	 * @param protein
 	 *          alias for which we are looking for a border
 	 * @return Shape object defining given alias
 	 */
-	protected Shape getTruncatedShape(final Element alias) {
+	protected Shape getTruncatedShape(final Protein protein) {
 		Shape shape;
 		GeneralPath path = new GeneralPath();
 		// CHECKSTYLE:OFF
-		path.moveTo(alias.getX() + 10, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY() + alias.getHeight() * 3 / 5);
-		path.lineTo(alias.getX() + alias.getWidth() * 4 / 5, alias.getY() + alias.getHeight() * 2 / 5);
-		path.lineTo(alias.getX() + alias.getWidth() * 4 / 5, alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX() + 10, alias.getY() + alias.getHeight());
+		path.moveTo(protein.getX() + 10, protein.getY());
+		path.lineTo(protein.getX() + protein.getWidth(), protein.getY());
+		path.lineTo(protein.getX() + protein.getWidth(), protein.getY() + protein.getHeight() * 3 / 5);
+		path.lineTo(protein.getX() + protein.getWidth() * 4 / 5, protein.getY() + protein.getHeight() * 2 / 5);
+		path.lineTo(protein.getX() + protein.getWidth() * 4 / 5, protein.getY() + protein.getHeight());
+		path.lineTo(protein.getX() + 10, protein.getY() + protein.getHeight());
 		path.curveTo(
-				alias.getX() + 5, alias.getY() + alias.getHeight() - 2, alias.getX() + 2, alias.getY() + alias.getHeight() - 5, alias.getX(),
-				alias.getY() + alias.getHeight() - 10);
-		path.lineTo(alias.getX(), alias.getY() + 10);
-		path.curveTo(alias.getX() + 2, alias.getY() + 5, alias.getX() + 5, alias.getY() + 2, alias.getX() + 10, alias.getY());
+				protein.getX() + 5, protein.getY() + protein.getHeight() - 2, protein.getX() + 2, protein.getY() + protein.getHeight() - 5, protein.getX(),
+				protein.getY() + protein.getHeight() - 10);
+		path.lineTo(protein.getX(), protein.getY() + 10);
+		path.curveTo(protein.getX() + 2, protein.getY() + 5, protein.getX() + 5, protein.getY() + 2, protein.getX() + 10, protein.getY());
 		// CHECKSTYLE:ON
 
 		path.closePath();
@@ -417,15 +419,15 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	/**
 	 * Returns shape of receptor protein as a list of points.
 	 * 
-	 * @param alias
+	 * @param protein
 	 *          alias for which we are looking for a border
 	 * @return list of points defining border of the given alias
 	 */
-	private ArrayList<Point2D> getReceptorPoints(final Element alias) {
-		double x = alias.getX();
-		double y = alias.getY();
-		double width = alias.getWidth();
-		double height = alias.getHeight();
+	private ArrayList<Point2D> getReceptorPoints(final Protein protein) {
+		double x = protein.getX();
+		double y = protein.getY();
+		double width = protein.getWidth();
+		double height = protein.getHeight();
 		ArrayList<Point2D> points = new ArrayList<Point2D>();
 
 		// CHECKSTYLE:OFF
@@ -443,17 +445,17 @@ public class ProteinConverter extends SpeciesConverter<Protein> {
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(final Protein alias) {
-		if (alias instanceof GenericProtein) {
-			return getGenericShape(alias).getPathIterator(new AffineTransform());
-		} else if (alias instanceof ReceptorProtein) {
-			return getReceptorShape(alias).getPathIterator(new AffineTransform());
-		} else if (alias instanceof IonChannelProtein) {
-			return getGenericShape(alias).getPathIterator(new AffineTransform());
-		} else if (alias instanceof TruncatedProtein) {
-			return getTruncatedShape(alias).getPathIterator(new AffineTransform());
+	public PathIterator getBoundPathIterator(final Protein protein) {
+		if (protein instanceof GenericProtein) {
+			return getGenericShape(protein).getPathIterator(new AffineTransform());
+		} else if (protein instanceof ReceptorProtein) {
+			return getReceptorShape(protein).getPathIterator(new AffineTransform());
+		} else if (protein instanceof IonChannelProtein) {
+			return getGenericShape(protein).getPathIterator(new AffineTransform());
+		} else if (protein instanceof TruncatedProtein) {
+			return getTruncatedShape(protein).getPathIterator(new AffineTransform());
 		} else {
-			throw new InvalidArgumentException("Not implemented protein converter for type: " + alias.getClass());
+			throw new InvalidArgumentException("Not implemented protein converter for type: " + protein.getClass());
 		}
 	}
 
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/RnaConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/RnaConverter.java
index 277a8afc651d80665eaf652fd9d4dae4622926b4..bf0b0533f521cf4572b7b00fdcca619f978c9263 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/RnaConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/RnaConverter.java
@@ -1,10 +1,10 @@
-	/**
-	 * Default constructor.
-	 * 
-	 * @param colorExtractor
-	 *          Object that helps to convert {@link ColorSchema} values into
-	 *          colors when drawing {@link Species}
-	 */
+/**
+ * Default constructor.
+ * 
+ * @param colorExtractor
+ *          Object that helps to convert {@link ColorSchema} values into colors
+ *          when drawing {@link Species}
+ */
 package lcsb.mapviewer.converter.graphics.bioEntity.element.species;
 
 import java.awt.Color;
@@ -23,7 +23,6 @@ import org.apache.log4j.Logger;
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Rna;
 import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.species.field.ModificationState;
@@ -55,46 +54,46 @@ public class RnaConverter extends SpeciesConverter<Rna> {
 	}
 
 	@Override
-	public void draw(final Rna alias, final Graphics2D graphics, final ConverterParams params) {
-		GeneralPath path = getRnaPath(alias);
+	public void draw(final Rna rna, final Graphics2D graphics, final ConverterParams params) {
+		GeneralPath path = getRnaPath(rna);
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(rna.getColor());
 		graphics.fill(path);
 		graphics.setColor(c);
 		Stroke stroke = graphics.getStroke();
-		graphics.setStroke(getBorderLine(alias));
+		graphics.setStroke(getBorderLine(rna));
 		graphics.draw(path);
 		graphics.setStroke(stroke);
 
-		for (RnaRegion mr : alias.getRegions()) {
-			drawModification(alias, mr, graphics, false, false);
+		for (RnaRegion mr : rna.getRegions()) {
+			drawModification(rna, mr, graphics, false, false);
 		}
 
-		drawText(alias, graphics, params);
+		drawText(rna, graphics, params);
 	}
 
 	/**
-	 * Returns shape of the Rna as a GeneralPath object.
+	 * Returns shape of the {@link Rna} as a {@link GeneralPath} object.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
-	 * @return GeneralPath object defining border of the given alias
+	 * @param rna
+	 *          {@link Rna} for which we are looking for a border
+	 * @return {@link GeneralPath} object defining border of the given {@link Rna}
 	 */
-	private GeneralPath getRnaPath(final Element alias) {
+	private GeneralPath getRnaPath(final Rna rna) {
 		// CHECKSTYLE:OFF
 		GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD, 4);
-		path.moveTo(alias.getX() + alias.getWidth() / 4, alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth(), alias.getY());
-		path.lineTo(alias.getX() + alias.getWidth() * 3 / 4, alias.getY() + alias.getHeight());
-		path.lineTo(alias.getX(), alias.getY() + alias.getHeight());
+		path.moveTo(rna.getX() + rna.getWidth() / 4, rna.getY());
+		path.lineTo(rna.getX() + rna.getWidth(), rna.getY());
+		path.lineTo(rna.getX() + rna.getWidth() * 3 / 4, rna.getY() + rna.getHeight());
+		path.lineTo(rna.getX(), rna.getY() + rna.getHeight());
 		// CHECKSTYLE:ON
 		path.closePath();
 		return path;
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(final Rna alias) {
-		return getRnaPath(alias).getPathIterator(new AffineTransform());
+	public PathIterator getBoundPathIterator(final Rna rna) {
+		return getRnaPath(rna).getPathIterator(new AffineTransform());
 	}
 
 	/**
@@ -103,10 +102,10 @@ public class RnaConverter extends SpeciesConverter<Rna> {
 	 * set then also description (position) of the modification is drawn on the
 	 * canvas.
 	 * 
-	 * @param alias
+	 * @param rna
 	 *          object that is 'parent' of the residue
-	 * @param mr
-	 *          modification to be drawn
+	 * @param region
+	 *          {@link RnaRegion modification} to be drawn
 	 * @param graphics
 	 *          - where the modification should be drawn
 	 * @param drawEmptyModification
@@ -115,22 +114,22 @@ public class RnaConverter extends SpeciesConverter<Rna> {
 	 *          flag that indicates if we should draw description of the
 	 *          modification
 	 */
-	private void drawModification(final Rna alias, final RnaRegion mr, final Graphics2D graphics, final boolean drawEmptyModification,
+	private void drawModification(final Rna rna, final RnaRegion region, final Graphics2D graphics, final boolean drawEmptyModification,
 			final boolean drawDescription) {
-		if ((!drawEmptyModification) && (mr.getState() == null)) {
+		if ((!drawEmptyModification) && (region.getState() == null)) {
 			return;
 		}
 		double diameter = DEFAULT_MODIFICATION_DIAMETER;
 
-		double x = alias.getX();
-		double y = alias.getY();
+		double x = rna.getX();
+		double y = rna.getY();
 
-		double width = alias.getWidth();
+		double width = rna.getWidth();
 
 		// CHECKSTYLE:OFF
 		// we draw modifier on the upper border of rna (which is only in
 		// 3/4 of the width of alias, but starts in 1/4 of the width)
-		Point2D p = new Point2D.Double(x + width / 4.0 + width * 3.0 / 4.0 * mr.getPos(), y - DEFAULT_MODIFICATION_DIAMETER);
+		Point2D p = new Point2D.Double(x + width / 4.0 + width * 3.0 / 4.0 * region.getPos(), y - DEFAULT_MODIFICATION_DIAMETER);
 		// CHECKSTYLE:ON
 
 		Ellipse2D ellipse = new Ellipse2D.Double(p.getX() - diameter / 2, p.getY() - diameter / 2, diameter, diameter);
@@ -141,13 +140,13 @@ public class RnaConverter extends SpeciesConverter<Rna> {
 		graphics.draw(ellipse);
 		graphics.drawLine((int) p.getX(), (int) (p.getY() + diameter / 2), (int) p.getX(), (int) y);
 
-		String text = mr.getName();
+		String text = region.getName();
 		if (!text.equals("") && drawDescription) {
 			double textWidth = graphics.getFontMetrics().stringWidth(text);
 			Point2D p2 = new Point2D.Double(p.getX() - textWidth / 2, p.getY() - DEFAULT_SPECIES_MODIFIER_FONT_SIZE);
 			graphics.drawString(text, (int) p2.getX(), (int) p2.getY());
 		}
-		ModificationState state = mr.getState();
+		ModificationState state = region.getState();
 		if (state != null) {
 			String str = state.getAbbreviation();
 			Font tmpFont = graphics.getFont();
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SBGNNucleicAcidFeatureConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SBGNNucleicAcidFeatureConverter.java
index 5412c1b961a4f388bf754aea9e8452528312722c..cd82b37bc9e91e2e3aba4f947c688f2de3ec4d73 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SBGNNucleicAcidFeatureConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SBGNNucleicAcidFeatureConverter.java
@@ -11,11 +11,10 @@ import java.awt.geom.PathIterator;
 import lcsb.mapviewer.commands.ColorExtractor;
 import lcsb.mapviewer.converter.graphics.ConverterParams;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
- * This class defines methods used for drawing SpeciesAlias of nucleic acid
+ * This class defines methods used for drawing {@link Species} of nucleic acid
  * feature in the SBGN way on the {@link Graphics2D} object.
  * 
  * @author Michał Kuźma
@@ -44,13 +43,13 @@ public class SBGNNucleicAcidFeatureConverter extends SpeciesConverter<Species> {
 	/**
 	 * Returns shape of SBGN Nucleic acid feature.
 	 * 
-	 * @param alias
-	 *          alias for which the shape should be returned
+	 * @param species
+	 *          {@link Species} for which the shape should be returned
 	 * @return shape of the SBGN Nucleic acid feature for given alias
 	 */
-	private Shape getShape(final Element alias) {
+	private Shape getShape(final Species species) {
 		GeneralPath bottomRoundedRectangle = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
-		double x = alias.getX(), y = alias.getY(), width = alias.getWidth(), height = alias.getHeight();
+		double x = species.getX(), y = species.getY(), width = species.getWidth(), height = species.getHeight();
 
 		bottomRoundedRectangle.moveTo(x, y);
 		bottomRoundedRectangle.lineTo(x, y + height - RECTANGLE_CORNER_ARC_SIZE);
@@ -64,24 +63,24 @@ public class SBGNNucleicAcidFeatureConverter extends SpeciesConverter<Species> {
 	}
 
 	@Override
-	public void draw(Species alias, Graphics2D graphics, ConverterParams params) {
+	public void draw(Species species, Graphics2D graphics, ConverterParams params) {
 		// Unit of information text - multimer cardinality
 		String unitOfInformationText = null;
-		if (alias.getStatePrefix() != null && alias.getStateLabel() != null) {
-			if (alias.getStatePrefix().equals("free input")) {
-				unitOfInformationText = alias.getStateLabel();
+		if (species.getStatePrefix() != null && species.getStateLabel() != null) {
+			if (species.getStatePrefix().equals("free input")) {
+				unitOfInformationText = species.getStateLabel();
 			} else {
-				unitOfInformationText = alias.getStatePrefix() + ":" + alias.getStateLabel();
+				unitOfInformationText = species.getStatePrefix() + ":" + species.getStateLabel();
 			}
 		}
 
-		int homodir = alias.getHomodimer();
+		int homodir = species.getHomodimer();
 
-		alias.setWidth(alias.getWidth() - SpeciesConverter.HOMODIMER_OFFSET * (alias.getHomodimer() - 1));
-		alias.setHeight(alias.getHeight() - SpeciesConverter.HOMODIMER_OFFSET * (alias.getHomodimer() - 1));
+		species.setWidth(species.getWidth() - SpeciesConverter.HOMODIMER_OFFSET * (species.getHomodimer() - 1));
+		species.setHeight(species.getHeight() - SpeciesConverter.HOMODIMER_OFFSET * (species.getHomodimer() - 1));
 
-		alias.setX(alias.getX() + SpeciesConverter.HOMODIMER_OFFSET * homodir);
-		alias.setY(alias.getY() + SpeciesConverter.HOMODIMER_OFFSET * homodir);
+		species.setX(species.getX() + SpeciesConverter.HOMODIMER_OFFSET * homodir);
+		species.setY(species.getY() + SpeciesConverter.HOMODIMER_OFFSET * homodir);
 
 		int glyphCount;
 		if (homodir > 1) {
@@ -90,18 +89,18 @@ public class SBGNNucleicAcidFeatureConverter extends SpeciesConverter<Species> {
 			glyphCount = 1;
 		}
 		for (int i = 0; i < glyphCount; i++) {
-			alias.setX(alias.getX() - SpeciesConverter.HOMODIMER_OFFSET);
-			alias.setY(alias.getY() - SpeciesConverter.HOMODIMER_OFFSET);
+			species.setX(species.getX() - SpeciesConverter.HOMODIMER_OFFSET);
+			species.setY(species.getY() - SpeciesConverter.HOMODIMER_OFFSET);
 
-			Shape shape = getShape(alias);
+			Shape shape = getShape(species);
 
 			Color c = graphics.getColor();
-			graphics.setColor(alias.getColor());
+			graphics.setColor(species.getColor());
 			graphics.fill(shape);
 			graphics.setColor(c);
 
 			Stroke stroke = graphics.getStroke();
-			graphics.setStroke(getBorderLine(alias));
+			graphics.setStroke(getBorderLine(species));
 			graphics.draw(shape);
 			graphics.setStroke(stroke);
 
@@ -118,16 +117,16 @@ public class SBGNNucleicAcidFeatureConverter extends SpeciesConverter<Species> {
 
 		}
 
-		drawUnitOfInformation(unitOfInformationText, alias, graphics);
-		drawText(alias, graphics, params);
+		drawUnitOfInformation(unitOfInformationText, species, graphics);
+		drawText(species, graphics, params);
 
-		alias.setWidth(alias.getWidth() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
-		alias.setHeight(alias.getHeight() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
+		species.setWidth(species.getWidth() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
+		species.setHeight(species.getHeight() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
 	}
 
 	@Override
-	protected PathIterator getBoundPathIterator(Species alias) {
-		return getShape(alias).getPathIterator(new AffineTransform());
+	protected PathIterator getBoundPathIterator(Species species) {
+		return getShape(species).getPathIterator(new AffineTransform());
 	}
 
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SimpleMoleculeConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SimpleMoleculeConverter.java
index 8abca141bd11232bed19933a0737079b56a8c016..8ce04bcc3d88e37d14e34c3f439c3cf2f9bd26c0 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SimpleMoleculeConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SimpleMoleculeConverter.java
@@ -18,8 +18,8 @@ import lcsb.mapviewer.model.map.species.SimpleMolecule;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
- * This class defines methods used for drawing {@link SimpleMolecule} on
- * the {@link Graphics2D} object.
+ * This class defines methods used for drawing {@link SimpleMolecule} on the
+ * {@link Graphics2D} object.
  * 
  * @author Piotr Gawron
  * 
@@ -42,42 +42,42 @@ public class SimpleMoleculeConverter extends SpeciesConverter<SimpleMolecule> {
 	}
 
 	@Override
-	public void draw(final SimpleMolecule alias, final Graphics2D graphics, final ConverterParams params) {
+	public void draw(final SimpleMolecule simpleMolecule, final Graphics2D graphics, final ConverterParams params) {
 		int homodir;
 		if (params.isSbgnFormat()) {
 			// If the SBGN display mode is set, multimer is shown as two stacked
 			// glyphs
-			if (alias.getHomodimer() > 1) {
+			if (simpleMolecule.getHomodimer() > 1) {
 				homodir = 2;
 			} else {
 				homodir = 1;
 			}
 		} else {
-			homodir = alias.getHomodimer();
+			homodir = simpleMolecule.getHomodimer();
 		}
 
-		alias.setWidth(alias.getWidth() - SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
-		alias.setHeight(alias.getHeight() - SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
+		simpleMolecule.setWidth(simpleMolecule.getWidth() - SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
+		simpleMolecule.setHeight(simpleMolecule.getHeight() - SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
 
 		// SBGN view - simple molecules are represented as circles
 		if (params.isSbgnFormat()) {
-			alias.setX(alias.getX() + (alias.getWidth() - alias.getHeight()) / 2);
-			alias.setWidth(alias.getHeight());
+			simpleMolecule.setX(simpleMolecule.getX() + (simpleMolecule.getWidth() - simpleMolecule.getHeight()) / 2);
+			simpleMolecule.setWidth(simpleMolecule.getHeight());
 		}
 
-		alias.setX(alias.getX() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
-		alias.setY(alias.getY() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
+		simpleMolecule.setX(simpleMolecule.getX() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
+		simpleMolecule.setY(simpleMolecule.getY() + SpeciesConverter.HOMODIMER_OFFSET * (homodir));
 
 		for (int i = 0; i < homodir; i++) {
-			alias.setX(alias.getX() - SpeciesConverter.HOMODIMER_OFFSET);
-			alias.setY(alias.getY() - SpeciesConverter.HOMODIMER_OFFSET);
-			Shape shape = new Ellipse2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight());
+			simpleMolecule.setX(simpleMolecule.getX() - SpeciesConverter.HOMODIMER_OFFSET);
+			simpleMolecule.setY(simpleMolecule.getY() - SpeciesConverter.HOMODIMER_OFFSET);
+			Shape shape = new Ellipse2D.Double(simpleMolecule.getX(), simpleMolecule.getY(), simpleMolecule.getWidth(), simpleMolecule.getHeight());
 			Color c = graphics.getColor();
-			graphics.setColor(alias.getColor());
+			graphics.setColor(simpleMolecule.getColor());
 			graphics.fill(shape);
 			graphics.setColor(c);
 			Stroke stroke = graphics.getStroke();
-			graphics.setStroke(getBorderLine(alias));
+			graphics.setStroke(getBorderLine(simpleMolecule));
 			graphics.draw(shape);
 			graphics.setStroke(stroke);
 
@@ -85,8 +85,8 @@ public class SimpleMoleculeConverter extends SpeciesConverter<SimpleMolecule> {
 			// containing cardinality
 			if (params.isSbgnFormat() && (i == homodir - 1)) {
 				String unitOfInformationText = null;
-				if (alias.getStatePrefix() != null && alias.getStateLabel() != null) {
-					unitOfInformationText = alias.getStatePrefix() + ":" + alias.getStateLabel();
+				if (simpleMolecule.getStatePrefix() != null && simpleMolecule.getStateLabel() != null) {
+					unitOfInformationText = simpleMolecule.getStatePrefix() + ":" + simpleMolecule.getStateLabel();
 				}
 				if (homodir == 2 && (unitOfInformationText == null || !unitOfInformationText.contains("N:"))) {
 					if (unitOfInformationText != null) {
@@ -94,30 +94,31 @@ public class SimpleMoleculeConverter extends SpeciesConverter<SimpleMolecule> {
 					} else {
 						unitOfInformationText = "";
 					}
-					unitOfInformationText += "N:" + alias.getHomodimer();
+					unitOfInformationText += "N:" + simpleMolecule.getHomodimer();
 				}
 
-				drawUnitOfInformation(unitOfInformationText, alias, graphics);
+				drawUnitOfInformation(unitOfInformationText, simpleMolecule, graphics);
 			}
 		}
-		alias.setWidth(alias.getWidth() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
-		alias.setHeight(alias.getHeight() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
-		drawText(alias, graphics, params);
+		simpleMolecule.setWidth(simpleMolecule.getWidth() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
+		simpleMolecule.setHeight(simpleMolecule.getHeight() + SpeciesConverter.HOMODIMER_OFFSET * (homodir - 1));
+		drawText(simpleMolecule, graphics, params);
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(final SimpleMolecule alias) {
+	public PathIterator getBoundPathIterator(final SimpleMolecule simpleMolecule) {
 		throw new InvalidStateException("This class doesn't provide boundPath");
 	}
 
 	@Override
-	public Point2D getPointCoordinatesOnBorder(final SimpleMolecule alias, final double angle) {
-		if (alias.getWidth() == 0 && alias.getHeight() == 0) {
+	public Point2D getPointCoordinatesOnBorder(final SimpleMolecule simpleMolecule, final double angle) {
+		if (simpleMolecule.getWidth() == 0 && simpleMolecule.getHeight() == 0) {
 			logger.warn("Looking for coordinates on border of alias of size 0");
-			return alias.getCenter();
+			return simpleMolecule.getCenter();
 		}
 		Point2D result;
-		result = getEllipseTransformation().getPointOnEllipseByRadian(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight(), angle);
+		result = getEllipseTransformation()
+				.getPointOnEllipseByRadian(simpleMolecule.getX(), simpleMolecule.getY(), simpleMolecule.getWidth(), simpleMolecule.getHeight(), angle);
 		return result;
 
 	}
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SpeciesConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SpeciesConverter.java
index fb2460619fcd85d355aac51b301c351525d48b53..2bf368852c188ceceb829c2009a4541d6007d2df 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SpeciesConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/SpeciesConverter.java
@@ -16,7 +16,6 @@ import java.util.List;
 import org.apache.log4j.Logger;
 
 import lcsb.mapviewer.commands.ColorExtractor;
-import lcsb.mapviewer.commands.SemanticZoomLevelMatcher;
 import lcsb.mapviewer.common.Configuration;
 import lcsb.mapviewer.common.exception.InvalidStateException;
 import lcsb.mapviewer.common.geometry.EllipseTransformation;
@@ -27,22 +26,19 @@ import lcsb.mapviewer.converter.graphics.bioEntity.element.ElementConverter;
 import lcsb.mapviewer.model.graphics.LineType;
 import lcsb.mapviewer.model.map.layout.ColorSchema;
 import lcsb.mapviewer.model.map.species.Complex;
-import lcsb.mapviewer.model.map.species.Element;
 import lcsb.mapviewer.model.map.species.Species;
 
 /**
- * This class defines basics used for drawing aliases of {@link Species} (node
- * in the graph representation) on the graphics2d object.
+ * This class defines basics used for drawing {@link Species} (node in the graph
+ * representation) on the {@link Graphics2D} object.
  * 
  * @param <T>
- *          alias class that can be drawn with this converter
+ *          type of {@link Species} class that can be drawn with this converter
  * @author Piotr Gawron
  * 
  */
 public abstract class SpeciesConverter<T extends Species> extends ElementConverter<T> {
 
-	private SemanticZoomLevelMatcher zoomLevelMatcher			= new SemanticZoomLevelMatcher();
-
 	/**
 	 * PI value.
 	 */
@@ -167,45 +163,47 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	};
 
 	/**
-	 * Returns coordinates on the alias border for given angle.
+	 * Returns coordinates on the {@link Species} border for given angle.
 	 * 
-	 * @param alias
-	 *          object on border which the point is looked for
+	 * @param species
+	 *          {@link Species} on border which the point is looked for
 	 * @param angle
-	 *          angle between X axis center point of alias and point that we are
-	 *          looking for
-	 * @return coordinates on the alias border that correspond to the angle
+	 *          angle between X axis center point of {@link Species} and point
+	 *          that we are looking for
+	 * @return coordinates on the {@link Species} border that correspond to the
+	 *         angle
 	 */
-	protected Point2D getPointCoordinatesOnBorder(final T alias, final double angle) {
+	protected Point2D getPointCoordinatesOnBorder(final T species, final double angle) {
 		Point2D result = null;
-		if (alias.getWidth() == 0 && alias.getHeight() == 0) {
-			result = alias.getCenter();
+		if (species.getWidth() == 0 && species.getHeight() == 0) {
+			result = species.getCenter();
 		} else {
-			double dist = Math.max(alias.getWidth(), alias.getHeight()) * 2;
-			Point2D startPoint = alias.getCenter();
+			double dist = Math.max(species.getWidth(), species.getHeight()) * 2;
+			Point2D startPoint = species.getCenter();
 			double x = startPoint.getX() + Math.cos(angle) * dist;
 			double y = startPoint.getY() - Math.sin(angle) * dist;
 			Point2D endPoint = new Point2D.Double(x, y);
 			Line2D line = new Line2D.Double(startPoint, endPoint);
-			result = lineTransformation.getIntersectionWithPathIterator(line, getBoundPathIterator(alias));
+			result = lineTransformation.getIntersectionWithPathIterator(line, getBoundPathIterator(species));
 		}
 		return result;
 
 	}
 
 	/**
-	 * Returns coordinates on the alias border for given angle for residues.
+	 * Returns coordinates on the {@link Species} border for given angle for
+	 * residues.
 	 * 
-	 * @param alias
+	 * @param species
 	 *          object on border which the point is looked for
 	 * @param angle
 	 *          CellDEsigner specific angle defining coordinates (;/)
 	 * @return coordinates on the alias border that correspond to the angle
 	 */
-	protected Point2D getResidueCoordinates(final T alias, double angle) {
+	protected Point2D getResidueCoordinates(final T species, double angle) {
 		Point2D result = null;
-		if (alias.getWidth() == 0 && alias.getHeight() == 0) {
-			result = alias.getCenter();
+		if (species.getWidth() == 0 && species.getHeight() == 0) {
+			result = species.getCenter();
 		} else {
 			double x = 0;
 			double y = 0;
@@ -219,74 +217,76 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 				// CHECKSTYLE:OFF 0.5 is much readable than any other suggestion
 				double ratio = 0.5 + angle / (PI / 2);
 				// CHECKSTYLE:ON
-				x = alias.getX() + alias.getWidth();
-				y = alias.getY() + alias.getHeight() * (1 - ratio);
+				x = species.getX() + species.getWidth();
+				y = species.getY() + species.getHeight() * (1 - ratio);
 			} else if (angle < TOP_RESIDUE_MAX_ANGLE) {
 				double ratio = (angle - RIGHT_TOP_RESIDUE_MAX_ANGLE) / (PI / 2);
-				y = alias.getY();
-				x = alias.getX() + alias.getWidth() * (1 - ratio);
+				y = species.getY();
+				x = species.getX() + species.getWidth() * (1 - ratio);
 			} else if (angle < LEFT_RESIDUE_MAX_ANGLE) {
 				double ratio = (angle - TOP_RESIDUE_MAX_ANGLE) / (PI / 2);
-				y = alias.getY() + alias.getHeight() * (ratio);
-				x = alias.getX();
+				y = species.getY() + species.getHeight() * (ratio);
+				x = species.getX();
 			} else if (angle < BOTTOM_RESIDUE_MAX_ANGLE) {
 				double ratio = (angle - LEFT_RESIDUE_MAX_ANGLE) / (PI / 2);
-				y = alias.getY() + alias.getHeight();
-				x = alias.getX() + alias.getWidth() * ratio;
+				y = species.getY() + species.getHeight();
+				x = species.getX() + species.getWidth() * ratio;
 			} else if (angle <= 2 * PI + Configuration.EPSILON) {
 				double ratio = (angle - BOTTOM_RESIDUE_MAX_ANGLE) / (PI / 2);
-				y = alias.getY() + alias.getHeight() * (1 - ratio);
-				x = alias.getX() + alias.getWidth();
+				y = species.getY() + species.getHeight() * (1 - ratio);
+				x = species.getX() + species.getWidth();
 			} else {
 				throw new InvalidStateException();
 			}
-			Point2D center = alias.getCenter();
+			Point2D center = species.getCenter();
 			double correctedAngle = -Math.atan2((y - center.getY()), (x - center.getX()));
-			result = getPointCoordinatesOnBorder(alias, correctedAngle);
+			result = getPointCoordinatesOnBorder(species, correctedAngle);
 		}
 		return result;
 
 	}
 
 	/**
-	 * Returns default shape of the alias.
+	 * Returns default shape of the {@link Species}.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
-	 * @return Shape object defining given alias
+	 * @param species
+	 *          {@link Species} for which we are looking for a border
+	 * @return {@link Shape} object defining given {@link Species}
 	 */
-	protected Shape getDefaultAliasShape(final Element alias) {
+	protected Shape getDefaultAliasShape(final Species species) {
 		Shape shape;
-		shape = new Rectangle(alias.getX().intValue(), alias.getY().intValue(), alias.getWidth().intValue(), alias.getHeight().intValue());
+		shape = new Rectangle(species.getX().intValue(), species.getY().intValue(), species.getWidth().intValue(), species.getHeight().intValue());
 		return shape;
 	}
 
 	/**
-	 * Returns font that should be used for drawing description of the alias.
+	 * Returns font that should be used for drawing description of the
+	 * {@link Species}.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a font
+	 * @param species
+	 *          {@link Species} for which we are looking for a font
 	 * @param params
 	 *          specific drawing parameters (like scale)
-	 * @return Font that should be used for drawing alias description
+	 * @return {@link Font} that should be used for drawing {@link Species}
+	 *         description
 	 */
-	protected Font getFont(final Element alias, ConverterParams params) {
+	protected Font getFont(final Species species, ConverterParams params) {
 		double fontSize = DEFAULT_SPECIES_FONT_SIZE;
-		if (alias.getFontSize() != null) {
-			fontSize = alias.getFontSize();
+		if (species.getFontSize() != null) {
+			fontSize = species.getFontSize();
 		}
 		return new Font(Font.SANS_SERIF, 0, (int) (fontSize * params.getScale()));
 	}
 
 	/**
-	 * Returns text describing alias.
+	 * Returns text describing {@link Species}.
 	 * 
-	 * @param alias
+	 * @param species
 	 *          object under investigation
-	 * @return description of the alias
+	 * @return description of the {@link Species}
 	 */
-	protected String getText(final T alias) {
-		String name = alias.getName();
+	protected String getText(final T species) {
+		String name = species.getName();
 		if (name.equals("")) {
 			name = " ";
 		}
@@ -295,18 +295,18 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	}
 
 	@Override
-	public void drawText(final T alias, final Graphics2D graphics, final ConverterParams params) {
-		String text = getText(alias);
+	public void drawText(final T species, final Graphics2D graphics, final ConverterParams params) {
+		String text = getText(species);
 		Font oldFont = graphics.getFont();
-		Font font = getFont(alias, params);
+		Font font = getFont(species, params);
 		graphics.setColor(Color.BLACK);
 		graphics.setFont(font);
 
-		Point2D point = alias.getCenter();
-		if (alias instanceof Complex) {
-			if (((Complex) alias).getElements().size() > 0) {
-				if (zoomLevelMatcher.isTransparent(params.getLevel(), alias.getTransparencyLevel())) {
-					point.setLocation(point.getX(), alias.getY() + alias.getHeight() - graphics.getFontMetrics().getAscent());
+		Point2D point = species.getCenter();
+		if (species instanceof Complex) {
+			if (((Complex) species).getElements().size() > 0) {
+				if (isTransparent(species, params)) {
+					point.setLocation(point.getX(), species.getY() + species.getHeight() - graphics.getFontMetrics().getAscent());
 				}
 			}
 		}
@@ -403,19 +403,19 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	/**
 	 * Returns line style used for drawing alias border.
 	 * 
-	 * @param alias
-	 *          alias to be drawn
-	 * @return style of the line used to draw alias
+	 * @param species
+	 *          {@link Species} to be drawn
+	 * @return style of the line used to draw {@link Species}
 	 */
-	protected Stroke getBorderLine(final Species alias) {
-		if (!alias.isHypothetical()) {
-			if (alias instanceof Complex) {
+	protected Stroke getBorderLine(final Species species) {
+		if (!species.isHypothetical()) {
+			if (species instanceof Complex) {
 				return LineType.SOLID_BOLD.getStroke();
 			} else {
 				return LineType.SOLID.getStroke();
 			}
 		} else {
-			if (alias instanceof Complex) {
+			if (species instanceof Complex) {
 				return LineType.DASHED_BOLD.getStroke();
 			} else {
 				return LineType.DASHED.getStroke();
@@ -424,13 +424,13 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	}
 
 	/**
-	 * Returns border of the alias as PathIterator.
+	 * Returns border of the {@link Species} as {@link PathIterator}.
 	 * 
-	 * @param alias
-	 *          alias for which we are looking for a border
-	 * @return PathIterator object defining given alias
+	 * @param species
+	 *          {@link Species} for which we are looking for a border
+	 * @return {@link PathIterator} object defining given {@link Species}
 	 */
-	protected abstract PathIterator getBoundPathIterator(T alias);
+	protected abstract PathIterator getBoundPathIterator(T species);
 
 	/**
 	 * @return the lineTransformation
@@ -498,23 +498,23 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	 * 
 	 * @param text
 	 *          state description text
-	 * @param alias
-	 *          state description should be drawn on this alias
+	 * @param species
+	 *          state description should be drawn on this {@link Species}
 	 * @param graphics
 	 *          where the drawing should be performed
 	 */
-	protected void drawStructuralState(String text, T alias, final Graphics2D graphics) {
+	protected void drawStructuralState(String text, T species, final Graphics2D graphics) {
 		if (text == null) {
 			return;
 		}
 
-		Point2D p = getPointCoordinatesOnBorder(alias, Math.PI / 2);
+		Point2D p = getPointCoordinatesOnBorder(species, Math.PI / 2);
 
 		double width = MIN_STRUCTURAL_STATE_WIDTH;
 		if (!text.trim().equals("")) {
 			width = Math.max(MIN_STRUCTURAL_STATE_WIDTH, graphics.getFontMetrics().stringWidth(text) + TEXT_MARGIN_FOR_STRUCTURAL_STATE_DESC);
 		}
-		width = Math.min(width, alias.getWidth());
+		width = Math.min(width, species.getWidth());
 		double height = STRUCTURAL_STATE_HEIGHT;
 
 		Ellipse2D ellipse = new Ellipse2D.Double(p.getX() - width / 2, p.getY() - height / 2, width, height);
@@ -537,28 +537,28 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	}
 
 	/**
-	 * Draws unit of information for the alias (rectangle in the top part of the
-	 * alias).
+	 * Draws unit of information for the {@link Species} (rectangle in the top
+	 * part of the alias).
 	 * 
 	 * @param text
 	 *          unit of information text
-	 * @param alias
-	 *          unit of information should be drawn on this alias
+	 * @param species
+	 *          unit of information should be drawn on this {@link Species}
 	 * @param graphics
 	 *          where the drawing should be performed
 	 */
-	protected void drawUnitOfInformation(String text, T alias, final Graphics2D graphics) {
+	protected void drawUnitOfInformation(String text, T species, final Graphics2D graphics) {
 		if (text == null) {
 			return;
 		}
 
-		Point2D p = getPointCoordinatesOnBorder(alias, Math.PI / 2);
+		Point2D p = getPointCoordinatesOnBorder(species, Math.PI / 2);
 
 		double width = MIN_UNIT_OF_INFORMATION_WIDTH;
 		if (!text.trim().equals("")) {
 			width = Math.max(MIN_UNIT_OF_INFORMATION_WIDTH, graphics.getFontMetrics().stringWidth(text) + TEXT_MARGIN_FOR_UNIT_OF_INFORMATION_DESC);
 		}
-		width = Math.min(width, alias.getWidth());
+		width = Math.min(width, species.getWidth());
 		double height = UNIT_OF_INFORMATION_HEIGHT;
 
 		Rectangle2D rectangle = new Rectangle2D.Double(p.getX() - width / 2, p.getY() - height / 2, width, height);
@@ -580,24 +580,24 @@ public abstract class SpeciesConverter<T extends Species> extends ElementConvert
 	}
 
 	@Override
-	public void draw(T alias, Graphics2D graphics, ConverterParams params, List<ColorSchema> visualizedLayoutsColorSchemas) throws DrawingException {
-		draw(alias, graphics, params);
+	public void draw(T species, Graphics2D graphics, ConverterParams params, List<ColorSchema> visualizedLayoutsColorSchemas) throws DrawingException {
+		draw(species, graphics, params);
 
 		Color oldColor = graphics.getColor();
 		int count = 0;
-		double width = alias.getWidth() / visualizedLayoutsColorSchemas.size();
+		double width = species.getWidth() / visualizedLayoutsColorSchemas.size();
 		for (ColorSchema schema : visualizedLayoutsColorSchemas) {
 			if (schema != null) {
 				double startX = (double) count / (double) visualizedLayoutsColorSchemas.size();
 				graphics.setColor(Color.BLACK);
 
-				int x = (int) (startX * alias.getWidth() + alias.getX());
-				graphics.drawRect(x, alias.getY().intValue(), (int) width, alias.getHeight().intValue());
+				int x = (int) (startX * species.getWidth() + species.getX());
+				graphics.drawRect(x, species.getY().intValue(), (int) width, species.getHeight().intValue());
 
 				Color color = colorExtractor.getNormalizedColor(schema);
 				Color bgAlphaColor = new Color(color.getRed(), color.getGreen(), color.getBlue(), LAYOUT_ALPHA);
 				graphics.setColor(bgAlphaColor);
-				graphics.fillRect(x, alias.getY().intValue(), (int) width, alias.getHeight().intValue());
+				graphics.fillRect(x, species.getY().intValue(), (int) width, species.getHeight().intValue());
 			}
 			count++;
 		}
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/UnknownConverter.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/UnknownConverter.java
index e304953c08b75d94805cb84ae052e4c912611228..8103b5141e06e83004616ac0ccd9e8941fdd2e97 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/UnknownConverter.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/bioEntity/element/species/UnknownConverter.java
@@ -19,9 +19,8 @@ import lcsb.mapviewer.model.map.species.Species;
 import lcsb.mapviewer.model.map.species.Unknown;
 
 /**
- * This class defines methods used for drawing SpeciesAlias of
- * {@link lcsb.mapviewer.converter.model.celldesigner.structure.db.model.map.species.Unknown
- * Unknown} on the {@link Graphics2D} object.
+ * This class defines methods used for drawing {@link Unknown} on the
+ * {@link Graphics2D} object.
  * 
  * @author Piotr Gawron
  * 
@@ -45,41 +44,39 @@ public class UnknownConverter extends SpeciesConverter<Unknown> {
 	}
 
 	@Override
-	public void draw(Unknown alias, final Graphics2D graphics, final ConverterParams params) {
-		if (alias.getActivity()) {
+	public void draw(Unknown unknown, final Graphics2D graphics, final ConverterParams params) {
+		if (unknown.getActivity()) {
 			int border = ACTIVITY_BORDER_DISTANCE;
-			alias.increaseBorder(border);
-			Shape shape2 = new Ellipse2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight());
+			unknown.increaseBorder(border);
+			Shape shape2 = new Ellipse2D.Double(unknown.getX(), unknown.getY(), unknown.getWidth(), unknown.getHeight());
 			Stroke stroke = graphics.getStroke();
 			graphics.setStroke(LineType.DOTTED.getStroke());
 			graphics.draw(shape2);
 			graphics.setStroke(stroke);
-			alias.increaseBorder(-border);
+			unknown.increaseBorder(-border);
 		}
 
-		Shape shape = new Ellipse2D.Double(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight());
+		Shape shape = new Ellipse2D.Double(unknown.getX(), unknown.getY(), unknown.getWidth(), unknown.getHeight());
 		Color c = graphics.getColor();
-		graphics.setColor(alias.getColor());
+		graphics.setColor(unknown.getColor());
 		graphics.fill(shape);
 		graphics.setColor(c);
-		drawText(alias, graphics, params);
+		drawText(unknown, graphics, params);
 	}
 
 	@Override
-	public PathIterator getBoundPathIterator(Unknown alias) {
+	public PathIterator getBoundPathIterator(Unknown unknown) {
 		throw new InvalidStateException("This class doesn't provide boundPath");
 	}
 
 	@Override
-	public Point2D getPointCoordinatesOnBorder(Unknown alias, final double angle) {
-		if (alias.getWidth() == 0 && alias.getHeight() == 0) {
+	public Point2D getPointCoordinatesOnBorder(Unknown unknown, final double angle) {
+		if (unknown.getWidth() == 0 && unknown.getHeight() == 0) {
 			logger.warn("Looking for coordinates for unknown of 0 size");
-			return alias.getCenter();
+			return unknown.getCenter();
 		}
 		Point2D result;
-		result = getEllipseTransformation().getPointOnEllipseByRadian(alias.getX(), alias.getY(), alias.getWidth(), alias.getHeight(), angle);
+		result = getEllipseTransformation().getPointOnEllipseByRadian(unknown.getX(), unknown.getY(), unknown.getWidth(), unknown.getHeight(), angle);
 		return result;
-
 	}
-
 }
diff --git a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/placefinder/PlaceFinder.java b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/placefinder/PlaceFinder.java
index 474275f24240426e29992f8e95fb33107f37f06b..48de38bd017c4be0b12050ec89d03c1a3dfae26f 100644
--- a/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/placefinder/PlaceFinder.java
+++ b/converter-graphics/src/main/java/lcsb/mapviewer/converter/graphics/placefinder/PlaceFinder.java
@@ -8,13 +8,13 @@ import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
 
+import org.apache.log4j.Logger;
+
 import lcsb.mapviewer.commands.SemanticZoomLevelMatcher;
 import lcsb.mapviewer.model.map.compartment.Compartment;
 import lcsb.mapviewer.model.map.model.Model;
 import lcsb.mapviewer.model.map.species.Element;
 
-import org.apache.log4j.Logger;
-
 /**
  * This class allows to find free space where description should appear for the
  * alias in hierarchical view.
@@ -24,6 +24,11 @@ import org.apache.log4j.Logger;
  */
 public class PlaceFinder {
 
+	/**
+	 * Class that allows to check if element is visible (or transparent) when
+	 * drawing. It's used to filter out invisible elements when drawing
+	 * semantic/hierarchy view.
+	 */
 	private SemanticZoomLevelMatcher zoomLevelMatcher = new SemanticZoomLevelMatcher();
 
 	/**
@@ -339,24 +344,27 @@ public class PlaceFinder {
 	}
 
 	/**
-	 * This method looks for a place to put description of the alias on the map.
+	 * This method looks for a place to put description of the {@link Compartment}
+	 * on the map.
 	 * 
-	 * @param alias
-	 *          alias for which we try to determine text position
+	 * @param compartment
+	 *          {@link Compartment} for which we try to determine text position
+	 * @param level
+	 *          level at which we will visualize element
 	 * @return bounds where text could be put
 	 */
-	public Rectangle2D getRetangle(Compartment alias, int level) {
-		Map<Integer, List<Compartment>> lists = otherAliases.get(alias);
+	public Rectangle2D getRetangle(Compartment compartment, int level) {
+		Map<Integer, List<Compartment>> lists = otherAliases.get(compartment);
 		if (lists == null) {
 			lists = new HashMap<>();
-			otherAliases.put(alias, lists);
+			otherAliases.put(compartment, lists);
 		}
 		List<Compartment> list = lists.get(level);
 		if (list == null) {
 			list = new ArrayList<Compartment>();
 			for (Compartment compAlias : model.getCompartments()) {
 				if (zoomLevelMatcher.isVisible(level, compAlias.getVisibilityLevel()) && !zoomLevelMatcher.isTransparent(level, compAlias.getTransparencyLevel())) {
-					if (compAlias.cross(alias) && compAlias.getSize() <= alias.getSize()) {
+					if (compAlias.cross(compartment) && compAlias.getSize() <= compartment.getSize()) {
 						list.add(compAlias);
 					}
 				}
@@ -364,13 +372,13 @@ public class PlaceFinder {
 			lists.put(level, list);
 		}
 
-		this.mainAlias = alias;
+		this.mainAlias = compartment;
 		this.aliases = list;
 
-		leftBound = alias.getX();
-		rightBound = (alias.getX() + alias.getWidth());
-		upBound = alias.getY();
-		bottomBound = (alias.getY() + alias.getHeight());
+		leftBound = compartment.getX();
+		rightBound = (compartment.getX() + compartment.getWidth());
+		upBound = compartment.getY();
+		bottomBound = (compartment.getY() + compartment.getHeight());
 
 		createMatrix();