/*
    * $RCSfile: ZoomMouseBehavior.java,v $
    * A modification of MouseZoom.java *
    *
    * Copyright (c) 2004 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: 1.1 $
   * $Date: 2004/09/28 09:44:32 $
   * $State: Exp $
   */
  /*
   * Modified to zoom along the rotated z-axis (actually move). 
   * Copyright (c) 2003 Delft University of Technology 
   * Jaffalaan 5, 2628 BX Delft, the Netherlands All
   * rights reserved.
   */
  package nl.tudelft.simulation.dsol.gui.animation3D.mouse;
  
  import java.awt.AWTEvent;
  import java.awt.Component;
  import java.awt.event.MouseEvent;
  import java.util.Enumeration;
  
  import javax.media.j3d.Transform3D;
  import javax.media.j3d.TransformGroup;
  import javax.media.j3d.WakeupCriterion;
  import javax.media.j3d.WakeupOnAWTEvent;
  import javax.media.j3d.WakeupOnBehaviorPost;
  import javax.vecmath.Vector3d;
  
  import com.sun.j3d.utils.behaviors.mouse.MouseBehavior;
  import com.sun.j3d.utils.behaviors.mouse.MouseBehaviorCallback;
  
  /***
   * ZoomMouseBehavior is a Java3D behavior object that lets users control the Z
   * axis translation of an object via a mouse drag motion with the second mouse
   * button. See MouseRotate for similar usage info.
   * Based on com.sun.j3d.utils.behaviors.mouse.MouseZoom.
   */
  
  public class ZoomMouseBehavior extends MouseBehavior
  {
      /*** zoom factor */
      private double zFactor = .04;
  
      /*** translation */
      private Vector3d translation = new Vector3d();
  
      /*** callback */
      private MouseBehaviorCallback callback = null;
      
      /*** rotation group around x-axis */
      private TransformGroup rotateXGroup = null;
  
      /*** rotation group around y-axis */
      private TransformGroup rotateYGroup = null;
  
      /*** rotation around x-axis */
      private Transform3D rotateX = new Transform3D();
  
      /*** rotation around y-axis */
      private Transform3D rotateY = new Transform3D();
  
  
      /***
      * Creates a zoom behavior given the transform group.
      * 
      * @param transformGroup The transformGroup to operate on.
      */
     public ZoomMouseBehavior(final TransformGroup transformGroup)
     {
         super(transformGroup);
     }
 
     /***
      * Creates a default mouse zoom behavior.
      */
     public ZoomMouseBehavior()
     {
         super(0);
     }
 
     /***
      * Creates a zoom 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 flags
      */
     public ZoomMouseBehavior(final int flags)
     {
         super(flags);
     }
 
     /***
      * Creates a zoom behavior that uses AWT listeners and behavior posts rather
      * than WakeupOnAWTEvent. The behavior is added to the specified Component.
      * A null component can be passed to specify the behavior should use
      * listeners. Components can then be added to the behavior with the
      * addListener(Component c) method.
      * 
      * @param c The Component to add the MouseListener and MouseMotionListener
      *            to.
      * @since Java 3D 1.2.1
      */
     public ZoomMouseBehavior(final Component c)
     {
         super(c, 0);
     }
 
     /***
      * Creates a zoom behavior that uses AWT listeners and behavior posts rather
      * than WakeupOnAWTEvent. The behaviors is added to the specified Component
      * and works on the given TransformGroup.
      * 
      * @param c The Component to add the MouseListener and MouseMotionListener
      *            to. A null component can be passed to specify the behavior
      *            should use listeners. Components can then be added to the
      *            behavior with the addListener(Component c) method.
      * @param transformGroup The TransformGroup to operate on.
      * @since Java 3D 1.2.1
      */
     public ZoomMouseBehavior(final Component c,
             final TransformGroup transformGroup)
     {
         super(c, transformGroup);
     }
 
     /***
      * Creates a zoom behavior that uses AWT listeners and behavior posts rather
      * than WakeupOnAWTEvent. The behavior is added to the specified Component.
      * A null component can be passed to specify the behavior should use
      * listeners. Components can then be added to the behavior with the
      * addListener(Component c) method. Note that this behavior still needs a
      * transform group to work on (use setTransformGroup(tg)) and the transform
      * group must add this behavior.
      * 
      * @param c The Component to add the MouseListener and MouseMotionListener
      *            to. A null component can be passed to specify the behavior
      *            should use listeners. Components can then be added to the
      *            behavior with the addListener(Component c) method.
      * @param flags interesting flags (wakeup conditions).
      * @since Java 3D 1.2.1
      */
     public ZoomMouseBehavior(final Component c, final int flags)
     {
         super(c, flags);
     }
 
     /***
      * @see javax.media.j3d.Behavior#initialize()
      */
     public void initialize()
     {
         super.initialize();
         if ((flags & INVERT_INPUT) == INVERT_INPUT)
         {
             zFactor *= -1;
             invert = true;
         }
     }
 
     /***
      * @return the y-axis movement multipler.
      */
     public double getFactor()
     {
         return zFactor;
     }
 
     /***
      * Set the y-axis movement multipler with factor.
      * 
      * @param factor the zoom factor
      */
     public void setFactor(final double factor)
     {
         zFactor = factor;
     }
     
     /***
      * Set the rotation around the x-axis.
      * 
      * @param rotateXGroup rotation around x-axis.
      */
     public void setRotateXGroup(final TransformGroup rotateXGroup)
     {
         this.rotateXGroup = rotateXGroup;
     }
 
     /***
      * Set the rotation around the y-axis.
      * 
      * @param rotateYGroup rotation around y-axis.
      */
     public void setRotateYGroup(final TransformGroup rotateYGroup)
     {
         this.rotateYGroup = rotateYGroup;
     }
 
     /***
      * @see javax.media.j3d.Behavior#processStimulus(java.util.Enumeration)
      */
     public void processStimulus(final Enumeration criteria)
     {
         WakeupCriterion wakeup;
         AWTEvent[] events;
         MouseEvent evt;
         // 	int id;
         // 	int dx, dy;
 
         while (criteria.hasMoreElements())
         {
             wakeup = (WakeupCriterion) criteria.nextElement();
             if (wakeup instanceof WakeupOnAWTEvent)
             {
                 events = ((WakeupOnAWTEvent) wakeup).getAWTEvent();
                 if (events.length > 0)
                 {
                     evt = (MouseEvent) events[events.length - 1];
                     doProcess(evt);
                 }
             } else if (wakeup instanceof WakeupOnBehaviorPost)
             {
                 while (true)
                 {
                     synchronized (mouseq)
                     {
                         if (mouseq.isEmpty())
                         {
                             break;
                         }
                         evt = (MouseEvent) mouseq.remove(0);
                         // consolodate MOUSE_DRAG events
                         while ((evt.getID() == MouseEvent.MOUSE_DRAGGED)
                                 && !mouseq.isEmpty()
                                 && (((MouseEvent) mouseq.get(0)).getID() == MouseEvent.MOUSE_DRAGGED))
                         {
                             evt = (MouseEvent) mouseq.remove(0);
                         }
                     }
                     doProcess(evt);
                 }
             }
 
         }
         wakeupOn(mouseCriterion);
     }
 
     /***
      * @param evt mouse event
      */
     void doProcess(final MouseEvent evt)
     {
         int id;
         int dy;
 
         processMouseEvent(evt);
 
         if (((buttonPress) && ((flags & MANUAL_WAKEUP) == 0))
                 || ((wakeUp) && ((flags & MANUAL_WAKEUP) != 0)))
         {
             id = evt.getID();
             if ((id == MouseEvent.MOUSE_DRAGGED) && evt.isAltDown()
                     && !evt.isMetaDown())
             {
 
                 this.y = evt.getY();
 
                 dy = this.y - this.y_last;
 
                 if ((!reset) && ((Math.abs(dy) < 50)))
                 {
                     //System.out.println("dx " + dx + " dy " + dy);
                     this.transformGroup.getTransform(this.currXform);
 
                     this.translation.x = 0;
                     this.translation.y = 0;
                     this.translation.z = -dy * this.zFactor;
 
                     this.transformX.setZero();
 
                     // Now do some rotations around the x- and y-axis if these
                     // are available.
                     if ((this.rotateYGroup != null)
                             && (this.rotateXGroup != null))
                     {
                         this.rotateYGroup.getTransform(this.rotateY);
                         this.rotateXGroup.getTransform(this.rotateX);
                         this.transformX.set(this.rotateY);
                         this.transformX.mul(this.rotateX);
                         
                         // transform the translation
                         this.transformX.transform(this.translation);
                     }
                     this.transformX.set(this.translation);
 
                     if (this.invert)
                     {
                         this.currXform.mul(this.currXform, this.transformX);
                     } else
                     {
                         this.currXform.mul(this.transformX, this.currXform);
                     }
 
                     this.transformGroup.setTransform(this.currXform);
 
                     this.transformChanged(this.currXform);
 
                     if (this.callback != null)
                     {
                         this.callback.transformChanged(
                                 MouseBehaviorCallback.ZOOM, this.currXform);
                     }
 
                 } else
                 {
                     this.reset = false;
                 }
 
                 this.x_last = this.x;
                 this.y_last = this.y;
             } else if (id == MouseEvent.MOUSE_PRESSED)
             {
                 this.x_last = evt.getX();
                 this.y_last = evt.getY();
             }
         }
     }
 
     /***
      * Users can overload this method which is called every time the Behavior
      * updates the transform
      * 
      * Default implementation does nothing
      * 
      * @param transform transform
      */
     public void transformChanged(final Transform3D transform)
     {
         //nothing
     }
 
     /***
      * The transformChanged method in the callback class will be called every
      * time the transform is updated
      * 
      * @param callback callback
      */
     public void setupCallback(final MouseBehaviorCallback callback)
     {
         this.callback = callback;
     }
 }