center line is properly break between product operator and reactant operator

converter-sbml/src/main/java/lcsb/mapviewer/converter/model/sbml/reaction/SbmlReactionParser.java

@@ -306,6 +306,10 @@ public class SbmlReactionParser extends SbmlBioEntityParser {
       operator = new AndOperator();
     }
     PolylineData line = extractCurve(reactionGlyph, reactionWithLayout, operator.getClass());
+    if (line.getPoints().size() == 0) {
+      line.addPoint(reactionWithLayout.getReactants().get(0).getLine().getEndPoint());
+      line.addPoint(reactionWithLayout.getReactants().get(0).getLine().getEndPoint());
+    }
     operator.addInputs(reactionWithLayout.getReactants());
     operator.setLine(line);
     return operator;
@@ -344,7 +348,7 @@ public class SbmlReactionParser extends SbmlBioEntityParser {
       return new PolylineData();
     }
 
-    int requiredLines = 1;
+    int requiredLines = 0;
     if (reaction.getReactants().size() > 1) {
       requiredLines++;
     }
@@ -353,20 +357,18 @@ public class SbmlReactionParser extends SbmlBioEntityParser {
     }
     int existingLines = curve.getCurveSegmentCount();
 
-    int reactantBreak;
-    int productBreak;
-    if (requiredLines == 3) {
-      reactantBreak = (existingLines - 1) / 2;
-    } else if (requiredLines == 2 && reaction.getReactants().size() > 1) {
-      reactantBreak = existingLines - 1;
-    } else if (requiredLines == 2 && reaction.getProducts().size() > 1) {
-      reactantBreak = 0;
+    int breakPoint;
+    if (requiredLines == 2) {
+      breakPoint = existingLines / 2;
+    } else if (reaction.getReactants().size() > 1) {
+      breakPoint = existingLines;
+    } else if (reaction.getProducts().size() > 1) {
+      breakPoint = 0;
     } else {
       throw new InvalidArgumentException(
           new ElementUtils().getElementTag(reaction) + "Reaction has no products and reactants");
     }
-    productBreak = reactantBreak + 1;
-    
+
     PolylineData result = new PolylineData();
     if (operator == TruncationOperator.class ||
         operator == DissociationOperator.class ||
@@ -374,22 +376,18 @@ public class SbmlReactionParser extends SbmlBioEntityParser {
       // Product operator
 
       if (existingLines >= requiredLines) {
-        CurveSegment segment = curve.getCurveSegment(productBreak);
+        CurveSegment segment = curve.getCurveSegment(breakPoint);
         result.addPoint(new Point2D.Double(segment.getStart().getX(), segment.getStart().getY()));
-        for (int i = productBreak; i < curve.getCurveSegmentCount(); i++) {
+        for (int i = breakPoint; i < curve.getCurveSegmentCount(); i++) {
           segment = curve.getCurveSegment(i);
           result.addPoint(new Point2D.Double(segment.getEnd().getX(), segment.getEnd().getY()));
         }
-      } else if (existingLines == 1) {
+      } else {
         CurveSegment segment = curve.getCurveSegment(0);
-        double startX = segment.getStart().getX() + (segment.getEnd().getX() - segment.getStart().getX()) * (requiredLines-1) / requiredLines;
-        double startY = segment.getStart().getY() + (segment.getEnd().getY() - segment.getStart().getY()) * (requiredLines-1) / requiredLines;
+        double startX = segment.getStart().getX() + (segment.getEnd().getX() - segment.getStart().getX()) / 2;
+        double startY = segment.getStart().getY() + (segment.getEnd().getY() - segment.getStart().getY()) / 2;
         result.addPoint(new Point2D.Double(startX, startY));
         result.addPoint(new Point2D.Double(segment.getEnd().getX(), segment.getEnd().getY()));
-      } else {
-        CurveSegment segment = curve.getCurveSegment(1);
-        result.addPoint(new Point2D.Double(segment.getStart().getX(), segment.getStart().getY()));
-        result.addPoint(new Point2D.Double(segment.getEnd().getX(), segment.getEnd().getY()));
       }
 
     } else if (operator == AssociationOperator.class || operator == AndOperator.class) {
@@ -398,16 +396,10 @@ public class SbmlReactionParser extends SbmlBioEntityParser {
       if (existingLines >= requiredLines) {
         CurveSegment segment = curve.getCurveSegment(0);
         result.addPoint(new Point2D.Double(segment.getStart().getX(), segment.getStart().getY()));
-        for (int i = 0; i < reactantBreak; i++) {
+        for (int i = 0; i < breakPoint; i++) {
           segment = curve.getCurveSegment(i);
           result.addPoint(new Point2D.Double(segment.getEnd().getX(), segment.getEnd().getY()));
         }
-      } else if (existingLines == 1) {
-        CurveSegment segment = curve.getCurveSegment(0);
-        result.addPoint(new Point2D.Double(segment.getStart().getX(), segment.getStart().getY()));
-        double endX = segment.getStart().getX() + (segment.getEnd().getX() - segment.getStart().getX()) / requiredLines;
-        double endY = segment.getStart().getY() + (segment.getEnd().getY() - segment.getStart().getY()) / requiredLines;
-        result.addPoint(new Point2D.Double(endX, endY));
       } else {
         CurveSegment segment = curve.getCurveSegment(0);
         result.addPoint(new Point2D.Double(segment.getStart().getX(), segment.getStart().getY()));