src/edu/mit/ezyang/gravity/j3d/PickSelectBehavior.java

   1 /*
   2  * To change this template, choose Tools | Templates
   3  * and open the template in the editor.
   4  */
   5
   6 package edu.mit.ezyang.gravity.j3d;
   7
   8 import com.sun.j3d.utils.behaviors.mouse.MouseBehaviorCallback;
   9 import com.sun.j3d.utils.geometry.Primitive;
  10 import com.sun.j3d.utils.picking.PickResult;
  11 import com.sun.j3d.utils.picking.behaviors.PickMouseBehavior;
  12 import java.awt.event.MouseEvent;
  13 import javax.media.j3d.Bounds;
  14 import javax.media.j3d.BranchGroup;
  15 import javax.media.j3d.Canvas3D;
  16 import javax.media.j3d.Transform3D;
  17
  18 /**
  19  *
  20  * @author Edward Z. Yang <ezyang@mit.edu>
  21  */
  22 public class PickSelectBehavior extends PickMouseBehavior implements MouseBehaviorCallback {
  23     protected PickSelectCallback callback;
  24     public PickSelectBehavior(BranchGroup root, Canvas3D canvas, Bounds bounds) {
  25         super(canvas, root, bounds);
  26         setSchedulingBounds(bounds);
  27     }
  28     public void setupCallback(PickSelectCallback callback) {
  29         this.callback = callback;
  30     }
  31     public void updateScene(int xpos, int ypos) {
  32         Primitive primitive = null;
  33         if (mevent.getButton() == MouseEvent.BUTTON1) {
  34             pickCanvas.setShapeLocation(xpos, ypos);
  35             PickResult pr = pickCanvas.pickClosest();
  36             if ((pr != null) &&
  37                     ((primitive = (Primitive) pr.getNode(PickResult.PRIMITIVE)) != null) &&
  38                     (primitive.getCapability(Primitive.ENABLE_APPEARANCE_MODIFY ))) {
  39                 if (callback != null) {
  40                     callback.notifyPick(primitive);
  41                 }
  42             }
  43         }
  44     }
  45
  46     /**
  47      * Callback method from MouseTranslate
  48      * This is used when the Picking callback is enabled
  49      */
  50     public void transformChanged(int type, Transform3D transform) {
  51     }
  52 }