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 FlingAnimation implements Animation {
  	
  	private float velocityX;
  	private float velocityY;
  	
  	private float factor = 0.95f;
  	
  	private float threshold = 10;
  	
  	private FlingAnimationListener listener;
  	
  	/* (non-Javadoc)
  	 * @see com.polites.android.Transformer#update(com.polites.android.GestureImageView, long)
  	 */
  	@Override
  	public boolean update(GestureImageView view, long time) {
  		float seconds = (float) time / 1000.0f;
  		
  		float dx = velocityX * seconds;
  		float dy = velocityY * seconds;
  		
  		velocityX *= factor;
  		velocityY *= factor;
  		
  		boolean active = (Math.abs(velocityX) > threshold && Math.abs(velocityY) > threshold);
  		
  		if(listener != null) {
  			listener.onMove(dx, dy);
  			
  			if(!active) {
  				listener.onComplete();
  			}
  		}
  		
  		return active;
  	}
  	
  	public void setVelocityX(float velocityX) {
  		this.velocityX = velocityX;
  	}
  	
  	public void setVelocityY(float velocityY) {
  		this.velocityY = velocityY;
  	}
  	
  	public void setFactor(float factor) {
  		this.factor = factor;
  	}
  
  	public void setListener(FlingAnimationListener listener) {
  		this.listener = listener;
  	}
  }
  