pickzoombehavior.java

JAVA3D矩陈的相关类

/*
 * $RCSfile: PickZoomBehavior.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 *
 * $Revision: 1.5 $
 * $Date: 2007/02/09 17:20:26 $
 * $State: Exp $
 */

package com.sun.j3d.utils.picking.behaviors;

import com.sun.j3d.utils.picking.*;
import com.sun.j3d.utils.behaviors.mouse.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.media.j3d.*;
import javax.vecmath.*;


/**
 * A mouse behavior that allows user to pick and zoom scene graph objects.
 * Common usage: 1. Create your scene graph. 2. Create this behavior with
 * the root and canvas. See PickRotateBehavior for more details. 
 */

public class PickZoomBehavior extends PickMouseBehavior implements MouseBehaviorCallback {
  MouseZoom zoom;
  private PickingCallback callback = null;
  private TransformGroup currentTG;

  /**
   * Creates a pick/zoom behavior that waits for user mouse events for
   * the scene graph. 
   * @param root   Root of your scene graph.
   * @param canvas Java 3D drawing canvas.
   * @param bounds Bounds of your scene.
   **/

  public PickZoomBehavior(BranchGroup root, Canvas3D canvas, Bounds bounds){
    super(canvas, root, bounds);
    zoom = new MouseZoom(MouseBehavior.MANUAL_WAKEUP);
    zoom.setTransformGroup(currGrp);
    currGrp.addChild(zoom);
    zoom.setSchedulingBounds(bounds);
    this.setSchedulingBounds(bounds);
  }

  /**
   * Creates a pick/zoom behavior that waits for user mouse events for
   * the scene graph. 
   * @param root   Root of your scene graph.
   * @param canvas Java 3D drawing canvas.
   * @param bounds Bounds of your scene.
   * @param pickMode specifys PickTool.BOUNDS, PickTool.GEOMETRY or
   * PickTool.GEOMETRY_INTERSECT_INFO.  
   * @see PickTool#setMode
   */
    public PickZoomBehavior(BranchGroup root, Canvas3D canvas, Bounds bounds, 
			    int pickMode) {
	super(canvas, root, bounds);
	zoom = new MouseZoom(MouseBehavior.MANUAL_WAKEUP);
	zoom.setTransformGroup(currGrp);
	currGrp.addChild(zoom);
	zoom.setSchedulingBounds(bounds);
	this.setSchedulingBounds(bounds);
	this.setMode(pickMode);
    }

  /**
   * Update the scene to manipulate any nodes. This is not meant to be 
   * called by users. Behavior automatically calls this. You can call 
   * this only if you know what you are doing.
   * 
   * @param xpos Current mouse X pos.
   * @param ypos Current mouse Y pos.
   **/

  public void updateScene(int xpos, int ypos){
    TransformGroup tg = null;
      
    if (mevent.isAltDown() && !mevent.isMetaDown()){
	   
      pickCanvas.setShapeLocation(xpos, ypos);
      PickResult pr = pickCanvas.pickClosest();
      if ((pr != null) &&
          ((tg = (TransformGroup)pr.getNode(PickResult.TRANSFORM_GROUP)) 
								!= null) &&
	  (tg.getCapability(TransformGroup.ALLOW_TRANSFORM_READ)) && 
	  (tg.getCapability(TransformGroup.ALLOW_TRANSFORM_WRITE))){
	zoom.setTransformGroup(tg);
	zoom.wakeup();
	currentTG = tg;
        // Need to clean up Issue 123 --- Chien        
	// freePickResult(pr);
      } else if (callback!=null)
          callback.transformChanged( PickingCallback.NO_PICK, null );
    }
  }

  /**
    * Callback method from MouseZoom
    * This is used when the Picking callback is enabled
    */
  public void transformChanged( int type, Transform3D transform ) {
      callback.transformChanged( PickingCallback.ZOOM, currentTG );
  }
 
  /**
    * Register the class @param callback to be called each
    * time the picked object moves
    */
  public void setupCallback( PickingCallback callback ) {
      this.callback = callback;
      if (callback==null)
          zoom.setupCallback( null );
      else
          zoom.setupCallback( this );
  }
}