Android Open Source - Hungry-Mouse Animation

From Project

Back to project page Hungry-Mouse.

License

The source code is released under:

MIT License

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Java Source Code

//Name:   Animation.java
//Purpose:  display different images in sequence based on the duration specified
// w  ww  .j a v  a 2s  .c  om
package com.hungry.mouse.main;

import com.hungry.mouse.framework.Image;

//java libraries
import java.util.ArrayList;//implementation of list with additional operations add,remove,replace

public class Animation {

  //local variables
  private ArrayList frames;//contain animframe objects
  private int currentFrame;//numerical location in the list
  //long is more accurate than int
  private long animTime;//keep track of time elapsed since last image
  private long totalDuration;//how long each image will be displayed

  //constructor
  public Animation() {
    frames = new ArrayList();
    totalDuration = 0;
    
    //threads are called together
    synchronized (this) {
      animTime = 0;
      currentFrame = 0;
    }
  }

  //add animframe object to animation list
  //threads are called together
  public synchronized void addFrame(Image image, long duration) {
    totalDuration += duration;
    frames.add(new AnimFrame(image, totalDuration));
  }

  //update current frame with its appropriate image
  public synchronized void update(long elapsedTime) {
    if (frames.size() > 1) {
      
      //add elapsed time to anime time
      animTime += elapsedTime;
      
      //if animation time exceeds total duration we change frame
      if (animTime >= totalDuration) {
        animTime = animTime % totalDuration;
        currentFrame = 0;

      }

      while (animTime > getFrame(currentFrame).endTime) {
        currentFrame++;

      }
    }
  }
  
  //get current frame`s image to paint(present) it
  //threads are called together  
  public synchronized Image getImage() {
    if (frames.size() == 0) {
      return null;
    } else {
      return getFrame(currentFrame).image;
    }
  }

  //get the frame`s location from the list
  private AnimFrame getFrame(int i) {
    return (AnimFrame) frames.get(i);
  }

  //create objects to contain current images and duration to be displayed
  private class AnimFrame {

    Image image;
    long endTime;
    
    //nested class
    public AnimFrame(Image image, long endTime) {
      this.image = image;
      this.endTime = endTime;//the end time to be displayed
    }
  }
}

Java Source Code List