animator.java

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package like.graphics;

import java.util.*;
import java.awt.*;

/**定义一个自定义的播放动画帧的方法
 */
public abstract class Animator
{
	public static final int AnimatorMode_Indexed = 0;
	public static final int AnimatorMode_Looped  = 1;
	public static final int AnimatorMode_OneShot = 2;
	public static final int AnimatorMode_Randoms = 3;
	public static final int AnimatorMode_Single  = 4;
	/**对图象帧链表的引用
	 */
	protected LinkedList frames;
	
	/**动画的当前索引
	 */
	protected int currIndex;
	
	/**创建一个新的Animator对象,其动画帧序列为空
	 */
	protected Animator()
	{
		frames = null;
		currIndex = 0;
	}
	
	public final void setFrames(LinkedList list)
	{
		this.frames = list;
	}
	
	public final LinkedList getFrames()
	{
		return frames;
	}
	
	//重置动画
	public void reset()
	{
		this.currIndex = 0;
	}
	
	//返回当前下标
	public int getCurrIndex()
	{
		return this.currIndex;
	}
	
	//设置当前下标
	public void setCurrIndex(int index)
	{
		this.currIndex = index;
	}
	
	//返回动画当前帧
	public Image getCurrFrame()
	{
		if(frames != null)
		{
			return (Image)frames.get(currIndex);
		}
		return null;
	}
	
	//定义如何播放帧
	public abstract void nextFrame();
	
	//用传入的数组作为索引的动画帧 
	public static class Indexed extends Animator
	{
		protected int[] indices;
		protected int arrayIndex;
		
		public Indexed()
		{
			super();
			arrayIndex = 0;
		}
		
		public Indexed(int [] idx)
		{
			indices = idx;
			arrayIndex = 0;
			currIndex = indices[0];
		}
		
		public void reset()
		{
			arrayIndex = 0;
			this.currIndex = indices[0];
		}
		
		public void nextFrame()
		{
			if(frames != null)
			{
				if(++arrayIndex >= indices.length)
				{
					arrayIndex = 0;	
				}
				currIndex = indices[arrayIndex];
			}
		}
		
	}//Indexed
	
	//动画帧按顺序循环播放
	public static class Looped extends Animator
	{
		public Looped()
		{
			super();
		}
		
		public void nextFrame()
		{
			if(frames != null)
			{
				if(++currIndex >= frames.size())
				{
					reset();
				}
			}
		}
	}//Looped
	
	//顺序播放,不循环
	public static class OneShot extends Animator
	{
		public void nextFrame()
		{
			if(frames != null)
			{
				if(++currIndex >= frames.size())
				{
					currIndex = frames.size()-1;
				}
			}
		}
	}//OneShot
	
	//随机播放
	public static class Randoms extends Animator
	{
		public void nextFrame()
		{
			if(frames != null)
			{
				currIndex = Math.abs((int)Math.random()%frames.size());
			}
		}
	}//Randoms
	
	//只含一帧的动画,不做任何处理
	public static class Single extends Animator
	{
		public void nextFrame()
		{
			//do nothing:)
		}
	}//Single
	
}//Animator