Android Open Source - tdpforce Fling Animation

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (c) 2012 Jason Polites/*from www .ja v a2  s  .c  o m*/
 * 
 * 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.android;

/**
 * @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;
  }
}

Java Source Code List

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