animator.java

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/**    
  * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.

  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.

  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
package jmt.gui.common.animation;

/**
 * Created by IntelliJ IDEA.
 * User: orsotronIII
 *
 * This class is a simple thread which only purpose is to update an
 * {@link jmt.gui.common.animation.Animation} implementing class, which must be passed
 * as a construction parameter.
 *
 * Modified by Bertoli Marco to terminate correctly.
 */
public class Animator extends Thread{
    // Used to wait for termination
    private final Object mutex = new Object();

    //tells whether this animation is running.
    private boolean isWorking=false;

    //number of millisecs between two frames of the animation
    private long sleepTime;

    /**The {@link jmt.gui.common.animation.Animation} implementing class that has to be
     * updated to show the animation.
     */
    protected Animation animation = null;

    /**Creates a new instance of Animator.
     * Frame rate is set by default at 30 frames per seconds.
     * @param a: Animation to be updated by this animator.{@see animation}
     */
    public Animator(Animation a){
        this(30, a);
    }

    /**Creates a new instance of Animator with explicit definition of framerate.
     * @param fps: framerate for this animation.
     * @param a: Animation to be updated by this animator.{@see animation}
     */
    public Animator(double fps, Animation a){
        super();
        animation = a;
        sleepTime = (long)(1000/fps);
    }

    /**Starts the handled animation*/
    public void start(){
        super.start();
        animation.init();
        isWorking=true;
    }

    /**Performs update of the handled animation as far as terminate() method has not been called.*/
    public void run(){
        synchronized(mutex) {
            while(isWorking){
                try{
                    mutex.wait(sleepTime);
                }catch(InterruptedException e){
                    this.terminate();
                }
                if (isWorking)
                    animation.refresh();
            }
        }
    }

    /**Terminates current animation*/
    public void terminate(){
        isWorking=false;
        synchronized(mutex) {
            mutex.notifyAll();
        }
    }

}