The Java 3D API Specification (2nd Edition)/The Java 3D API Specification (2nd Edition).iso/programs/examples/Billboard/MouseRotateY.java

Text File | 2000-04-28 | 5KB | 181 lines

/*
 *    @(#)MouseRotateY.java 1.3 00/02/10 13:13:43
 *
 * Copyright (c) 1996-2000 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
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE 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 SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * 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);

   }
}