Fixed mark rounding

- Returning mark 2 as mark 1 breaks rounding calculations

#story[1195]

racevisionGame/src/main/java/shared/model/CompoundMark.java

@@ -98,7 +98,7 @@ public class CompoundMark extends XMLCompoundMark{
      * @return The second mark of the compound mark.
      */
     public Mark getMark2() {
-        return mark2 == null? mark1 : mark2;
+        return mark2;
     }
 
 

racevisionGame/src/main/java/visualiser/Controllers/RaceController.java

@@ -255,7 +255,10 @@ public class RaceController extends Controller {
             Material markColor = new PhongMaterial(new Color(0.15,0.9,0.2,1));
             CompoundMark nextMark = boat.getCurrentLeg().getEndCompoundMark();
             view3D.getShape(nextMark.getMark1().getSourceID()).setMaterial(markColor);
-            view3D.getShape(nextMark.getMark2().getSourceID()).setMaterial(markColor);
+            if(nextMark.getMark2() != null) {
+                view3D.getShape(nextMark.getMark2().getSourceID()).setMaterial(markColor);
+            }
+
             boat.legProperty().addListener((o, prev, curr) -> swapColours(curr));
         }
         // Fix initial bird's-eye position
@@ -315,17 +318,22 @@ public class RaceController extends Controller {
         CompoundMark end = leg.getEndCompoundMark();
 
         Shape3D start1 = view3D.getShape(start.getMark1().getSourceID());
-        Shape3D start2 = view3D.getShape(start.getMark2().getSourceID());
         Shape3D end1 = view3D.getShape(end.getMark1().getSourceID());
-        Shape3D end2 = view3D.getShape(end.getMark2().getSourceID());
 
         Material nextMark = start1.getMaterial();
         Material lastMark = end1.getMaterial();
 
         start1.setMaterial(lastMark);
-        start2.setMaterial(lastMark);
+        if(start.getMark2() != null) {
+            Shape3D start2 = view3D.getShape(start.getMark2().getSourceID());
+            start2.setMaterial(lastMark);
+        }
+
         end1.setMaterial(nextMark);
-        end2.setMaterial(nextMark);
+        if(end.getMark2() != null) {
+            Shape3D end2 = view3D.getShape(end.getMark2().getSourceID());
+            end2.setMaterial(nextMark);
+        }
     }
 
     /**