Replaced mark arrow listener with animation timer.

#story[1195]

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

@@ -82,7 +82,7 @@ public class RaceController extends Controller {
     private ObservableList<Subject3D> viewSubjects;
 
     private Subject3D nextMarkArrow;
-    private ChangeListener<? super GPSCoordinate> pointToMark;
+    private AnimationTimer pointToMark;
 
     /**
      * The arrow controller.
@@ -367,17 +367,19 @@ public class RaceController extends Controller {
 
         try {
             VisualiserBoat boat = visualiserRace.getVisualiserRaceState().getBoat(subject3D.getSourceID());
-            this.pointToMark = (o, prev, curr) -> {
-                CompoundMark target = boat.getCurrentLeg().getEndCompoundMark();
-                Bearing headingToMark = GPSCoordinate.calculateBearing(boat.getPosition(), target.getAverageGPSCoordinate());
-
-                nextMarkArrow.setX(view3D.getPivot().getX());
-                nextMarkArrow.setY(view3D.getPivot().getY());
-                nextMarkArrow.setZ(view3D.getPivot().getZ() + 10);
-                nextMarkArrow.setHeading(headingToMark.degrees());
-            };
+            this.pointToMark = new AnimationTimer() {
+                @Override
+                public void handle(long now) {
+                    CompoundMark target = boat.getCurrentLeg().getEndCompoundMark();
+                    Bearing headingToMark = GPSCoordinate.calculateBearing(boat.getPosition(), target.getAverageGPSCoordinate());
 
-            boat.positionProperty().addListener(pointToMark);
+                    nextMarkArrow.setX(view3D.getPivot().getX());
+                    nextMarkArrow.setY(view3D.getPivot().getY());
+                    nextMarkArrow.setZ(view3D.getPivot().getZ() + 10);
+                    nextMarkArrow.setHeading(headingToMark.degrees());
+                }
+            };
+            pointToMark.start();
         } catch (BoatNotFoundException e) {
             e.printStackTrace();
         }
@@ -385,13 +387,7 @@ public class RaceController extends Controller {
 
     private void removeThirdPersonAnnotations(Subject3D subject3D) {
         viewSubjects.remove(nextMarkArrow);
-
-        try {
-            VisualiserBoat boat = visualiserRace.getVisualiserRaceState().getBoat(subject3D.getSourceID());
-            boat.positionProperty().removeListener(pointToMark);
-        } catch (BoatNotFoundException e) {
-            e.printStackTrace();
-        }
+        pointToMark.stop();
     }
 
     /**