Changed View3D add-remove interface to an ObservableList

#story[1196]

racevisionGame/src/main/java/visualiser/model/View3D.java

@@ -1,5 +1,7 @@
 package visualiser.model;
 
+import javafx.collections.ListChangeListener;
+import javafx.collections.ObservableList;
 import javafx.scene.Group;
 import javafx.scene.PerspectiveCamera;
 import javafx.scene.SubScene;
@@ -15,6 +17,10 @@ import javafx.scene.transform.Translate;
  * sky box, whose textures are set with special methods.
  */
 public class View3D extends Pane {
+    /**
+     * Observable list of renderable items
+     */
+    private ObservableList<Shape3D> items;
     /**
      * Rendering container for shapes
      */
@@ -83,12 +89,16 @@ public class View3D extends Pane {
         return camera;
     }
 
-    /**
-     * Adds new Shape3D object to scene
-     * @param shape to add
-     */
-    public void addShape(Shape3D shape) {
-        world.getChildren().add(shape);
+    public void setItems(ObservableList<Shape3D> items) {
+        this.items = items;
+        this.items.addListener((ListChangeListener<? super Shape3D>) c -> {
+            while(c.next()) {
+                if (c.wasRemoved() || c.wasAdded()) {
+                    for (Shape3D shape : c.getRemoved()) world.getChildren().remove(shape);
+                    for (Shape3D shape : c.getAddedSubList()) world.getChildren().add(shape);
+                }
+            }
+        });
     }
 
     public void setNearClip(double nearClip) {