pickrotatebehavior.java

JAVA3D矩陈的相关类

/*
 * $RCSfile: PickRotateBehavior.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 com.sun.j3d.internal.*;
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 drag scene graph objects.
 * Common usage: 
 * <p>
 * 1. Create your scene graph.
 * <p>
 * 2. Create this behavior with root and canvas.
 * <p>
 * <blockquote><pre>
 *	PickRotateBehavior behavior = new PickRotateBehavior(canvas, root, bounds);
 *      root.addChild(behavior);
 * </pre></blockquote>
 * <p>
 * The above behavior will monitor for any picking events on
 * the scene graph (below root node) and handle mouse drags on pick hits.
 * Note the root node can also be a subgraph node of the scene graph (rather
 * than the topmost).
 */

public class PickRotateBehavior extends PickMouseBehavior implements MouseBehaviorCallback {
  MouseRotate drag;
//   int pickMode = PickTool.BOUNDS;
  private PickingCallback callback=null;
  private TransformGroup currentTG;

  /**
   * Creates a pick/rotate behavior that waits for user mouse events for
   * the scene graph. This method has its pickMode set to BOUNDS picking. 
   * @param root   Root of your scene graph.
   * @param canvas Java 3D drawing canvas.
   * @param bounds Bounds of your scene.
   **/

  public PickRotateBehavior(BranchGroup root, Canvas3D canvas, Bounds bounds){
    super(canvas, root, bounds);
    drag = new MouseRotate(MouseRotate.MANUAL_WAKEUP);
    drag.setTransformGroup(currGrp);
    currGrp.addChild(drag);
    drag.setSchedulingBounds(bounds);
    this.setSchedulingBounds(bounds);
  }

  /**
   * Creates a pick/rotate 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 PickRotateBehavior(BranchGroup root, Canvas3D canvas, Bounds bounds, 
			    int pickMode){
    super(canvas, root, bounds);
    drag = new MouseRotate(MouseRotate.MANUAL_WAKEUP);
    drag.setTransformGroup(currGrp);
    currGrp.addChild(drag);
    drag.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.isMetaDown() && !mevent.isAltDown()){
      
      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))){
	drag.setTransformGroup(tg);
	drag.wakeup();
	currentTG = tg;
	// free the PickResult
        // Need to clean up Issue 123 --- Chien        
        // freePickResult(pr);
      } else if (callback!=null)
	callback.transformChanged( PickingCallback.NO_PICK, null );
    }
  }

  /**
    * Callback method from MouseRotate
    * This is used when the Picking callback is enabled
    */
  public void transformChanged( int type, Transform3D transform ) {
      callback.transformChanged( PickingCallback.ROTATE, 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)
          drag.setupCallback( null );
      else
          drag.setupCallback( this );
  }

}