sprite.java

来自「基于J2ME的手机游戏软件。可以控制游戏人物在地图上上下左右行走；可以在地图上放」· Java 代码 · 共 91 行

import javax.microedition.lcdui.Graphics;

public class Sprite
{
	private ImageSet imageSet;
	private int currentState;
	private int currentFrame;
	private int totalCycles;
	private long currentStateBegin;
	private long lastFrameChange;
	
	public Sprite(ImageSet imageSet,int startState,int startFrame)
	{
		this.imageSet = imageSet;
		setCurrentState(startState,true);
		setCurrentFrame(startFrame);
	}
	
	public void setCurrentFrame(int frame)
	{
		currentFrame = frame;
	}
	
	public void setCurrentState(int state,boolean force)
	{
		if(currentState != state || force)
		{
			currentState = state;
			currentFrame = 0;
			totalCycles = 0;
			currentStateBegin = System.currentTimeMillis();
		}
	}
	
	public void reset()
	{
		currentFrame = 0;
		totalCycles = 0;
		currentStateBegin = 0;
		lastFrameChange = 0;
	}
	
	public long getWhenStateBegin()
	{
		return currentStateBegin;
	}
	
	public long getTimeInCurrentState()
	{
		return (System.currentTimeMillis() - currentStateBegin);
	}
	
	public int getCurrentState()
	{
		return currentState;
	}
	
	public int getCurrentFrame()
	{
		return currentFrame;
	}
	
	public void draw(Graphics gra,int targetX,int targetY,int anchor)
	{
		imageSet.draw(gra,currentState,currentFrame,targetX,targetY,anchor);
	}
	
	public void cycle()
	{
		if(imageSet.getTotalFrames(currentState) > 1 && 
				imageSet.getAnimTime(currentState) > 0)
		{
			long deltaTime = System.currentTimeMillis() - lastFrameChange;
			if(deltaTime > imageSet.getAnimTimePerFrame(currentState))
			{
				currentFrame++;
				lastFrameChange = System.currentTimeMillis();
				if(currentFrame >= imageSet.getTotalFrames(currentState))
				{
					currentFrame = 0;
					totalCycles++;
				}
			}
		}
	}
	
	public int getTotalCycles()
	{
		return totalCycles;
	}
}