pickmousebehavior.java

JAVA3D矩陈的相关类

/*
 * $RCSfile: PickMouseBehavior.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: 1.4 $
 * $Date: 2007/02/09 17:20:25 $
 * $State: Exp $
 */

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

import com.sun.j3d.utils.pickfast.*;
import com.sun.j3d.internal.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.media.j3d.*;
import javax.vecmath.*;


/**
 * Base class that allows users to adding picking and mouse manipulation to
 * the scene graph (see PickDragBehavior for an example of how to extend
 * this base class). This class is useful for interactive apps.
 */

public abstract class PickMouseBehavior extends Behavior {
  
    protected PickCanvas pickCanvas;

    protected WakeupCriterion[] conditions;
    protected WakeupOr wakeupCondition;
    protected boolean buttonPress = false;

    protected TransformGroup currGrp;
    protected static final boolean debug = false;
    protected MouseEvent mevent;
  
    /** 
     * Creates a PickMouseBehavior given current canvas, root of the tree to
     * operate on, and the bounds.
     */
    public PickMouseBehavior(Canvas3D canvas, BranchGroup root, Bounds bounds){
	super();
	currGrp = new TransformGroup();
	currGrp.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
	currGrp.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
	root.addChild(currGrp);
	pickCanvas = new PickCanvas(canvas, root);
    }

    /**
     * Sets the pick mode 
     * @see PickTool#setMode
     **/  
    public void setMode(int pickMode) {
	pickCanvas.setMode(pickMode);
    }

    /**
     * Returns the pickMode
     * @see PickTool#getMode
     */ 

    public int getMode() {
	return pickCanvas.getMode();
    }

    /**
     * Sets the pick tolerance 
     * @see PickCanvas#setTolerance
     */  
    public void setTolerance(float tolerance) {
	pickCanvas.setTolerance(tolerance);
    }

    /**
     * Returns the pick tolerance
     * @see PickCanvas#getTolerance
     */ 
    public float getTolerance() {
	return pickCanvas.getTolerance();
    }

    public void initialize() {

	conditions = new WakeupCriterion[2];
	conditions[0] = new WakeupOnAWTEvent(Event.MOUSE_MOVE);
	conditions[1] = new WakeupOnAWTEvent(Event.MOUSE_DOWN);
	wakeupCondition = new WakeupOr(conditions);

	wakeupOn(wakeupCondition);
    }
  
    private void processMouseEvent(MouseEvent evt) {
	buttonPress = false;

	if (evt.getID()==MouseEvent.MOUSE_PRESSED |
	    evt.getID()==MouseEvent.MOUSE_CLICKED) {
	    buttonPress = true;
	    return;
	}
	else if (evt.getID() == MouseEvent.MOUSE_MOVED) {
	    // Process mouse move event
	}
    }
  
    public void processStimulus (Enumeration criteria) {
	WakeupCriterion wakeup;
	AWTEvent[] evt = null;
	int xpos = 0, ypos = 0;

	while(criteria.hasMoreElements()) {
	    wakeup = (WakeupCriterion)criteria.nextElement();
	    if (wakeup instanceof WakeupOnAWTEvent)
		evt = ((WakeupOnAWTEvent)wakeup).getAWTEvent();
	}
    
	if (evt[0] instanceof MouseEvent){
	    mevent = (MouseEvent) evt[0];

	    if (debug)
		System.out.println("got mouse event");
	    processMouseEvent((MouseEvent)evt[0]);
	    xpos = mevent.getPoint().x;
	    ypos = mevent.getPoint().y;
	}
    
	if (debug)
	    System.out.println("mouse position " + xpos + " " + ypos);
    
	if (buttonPress){
	    updateScene(xpos, ypos);
	}
	wakeupOn (wakeupCondition);
    }


    /** Subclasses shall implement this update function 
     */
    public abstract void updateScene(int xpos, int ypos);

}