content: /*
   * Copyright (c) 2012 Jason Polites
   * 
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *     http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.polites;
  
  
  /**
   * @author Jason Polites
   *
   */
  public class Animator extends Thread {
  	
  	private GestureImageView view;
  	private Animation animation;
  	private boolean running = false;
  	private boolean active = false;
  	private long lastTime = -1L;
  
  	public Animator(GestureImageView view, String threadName) {
  		super(threadName);
  		this.view = view;
  	}
  	
  	@Override
  	public void run() {
  		
  		running = true;
  		
  		while(running) {
  				
  			while(active && animation != null) {
  				long time = System.currentTimeMillis();
  				active = animation.update(view, time - lastTime);
  				view.redraw();
  				lastTime = time;					
  				
  				while(active) {
  					try {
  						if(view.waitForDraw(32)) { // 30Htz
  							break;
  						}
  					}
  					catch (InterruptedException ignore) {
  						active = false;
  					}
  				}
  			}
  			
  			synchronized(this) {
  				if(running) {
  					try {
  						wait();
  					}
  					catch (InterruptedException ignore) {}
  				}
  			}
  		}
  	}
  
  	public synchronized void finish() {
  		running = false;
  		active = false;
  		notifyAll();
  	}
  
  	public void play(Animation transformer) {
  		if(active) {
  			cancel();
  		}
   		this.animation = transformer;
   		
   		activate();
  	}
  	
  	public synchronized void activate() {
  		lastTime = System.currentTimeMillis();
  		active = true;
  		notifyAll();
  	}
  	
  	public void cancel() {
  		active = false;
  	}
  }
  