/*
 *       @(#)MouseRotateY.java 1.1 98/07/17 16:00:54
 *
 * Copyright (c) 1996-1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * 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 AND ITS LICENSORS SHALL NOT BE
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 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
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 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
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 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */


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

/**
 * MouseRotateY is a Java3D behavior object that lets users control the 
 * rotation of an object via a mouse.
 * <p>
 * To use this utility, first create a transform group that this 
 * rotate behavior will operate on. Then,
 *<blockquote><pre>
 * 
 *   MouseRotateY behavior = new MouseRotateY();
 *   behavior.setTransformGroup(objTrans);
 *   objTrans.addChild(behavior);
 *   behavior.setSchedulingBounds(bounds);
 *
 *</pre></blockquote>
 * The above code will add the rotate behavior to the transform
 * group. The user can rotate any object attached to the objTrans.
 */

public class MouseRotateY extends MouseBehavior {
  double  y_angle;
  double  y_factor;

  /**
   * Creates a rotate behavior given the transform group.
   * @param transformGroup The transformGroup to operate on.
   */
  public MouseRotateY(TransformGroup transformGroup) {
    super(transformGroup);
  }

  /**
   * Creates a default mouse rotate behavior.
   **/
  public MouseRotateY() {
      super(0);
   }

  /**
   * Creates a rotate behavior.
   * Note that this behavior still needs a transform
   * group to work on (use setTransformGroup(tg)) and
   * the transform group must add this behavior.
   * @param flags interesting flags (wakeup conditions).
   */
  public MouseRotateY(int flags) {
      super(flags);
   }

  public void initialize() {
    super.initialize();
    y_angle = 0;
    y_factor = .03;
    if ((flags & INVERT_INPUT) == INVERT_INPUT) {
       invert = true;
       y_factor *= -1;
    }
  }

  public double getYFactor() {
    return y_factor;
  }
  
  public void setFactor( double factor) {
    y_factor = factor;
    
  }
  

  public void processStimulus (Enumeration criteria) {
      WakeupCriterion wakeup;
      AWTEvent[] event;
      int id;
      int  dx;

      while (criteria.hasMoreElements()) {
         wakeup = (WakeupCriterion) criteria.nextElement();
         if (wakeup instanceof WakeupOnAWTEvent) {
            event = ((WakeupOnAWTEvent)wakeup).getAWTEvent();
            for (int i=0; i<event.length; i++) { 
              processMouseEvent((MouseEvent) event[i]);

              if (((buttonPress)&&((flags & MANUAL_WAKEUP) == 0)) ||
                  ((wakeUp)&&((flags & MANUAL_WAKEUP) != 0))){
                
                id = event[i].getID();
                if ((id == MouseEvent.MOUSE_DRAGGED) && 
                    !((MouseEvent)event[i]).isMetaDown() && 
                    !((MouseEvent)event[i]).isAltDown()){
                  
                  x = ((MouseEvent)event[i]).getX();

                  dx = x - x_last;

                  if (!reset){            
                    y_angle = dx * y_factor;
                    
                    transformY.rotY(y_angle);
                    
                    transformGroup.getTransform(currXform);
                    
                    //Vector3d translation = new Vector3d();
                    //Matrix3f rotation = new Matrix3f();
                    Matrix4d mat = new Matrix4d();
                    
                    // Remember old matrix
                    currXform.get(mat);
                    
                    // Translate to origin
                    currXform.setTranslation(new Vector3d(0.0,0.0,0.0));
                    if (invert) {
                        currXform.mul(currXform, transformX);
                        currXform.mul(currXform, transformY);
                    } else {
                        currXform.mul(transformX, currXform);
                        currXform.mul(transformY, currXform);
                    }
                    
                    // Set old translation back
                    Vector3d translation = new 
                      Vector3d(mat.m03, mat.m13, mat.m23);
                    currXform.setTranslation(translation);
                    
                    // Update xform
                    transformGroup.setTransform(currXform);
                  }
                  else {
                    reset = false;
                  }

                  x_last = x;
               }
               else if (id == MouseEvent.MOUSE_PRESSED) {
                  x_last = ((MouseEvent)event[i]).getX();
               }
              }
            }
         }
      }

      wakeupOn (mouseCriterion);
      
   }
}