java 游戏编程 (二)

接下来继续说动画的制作。
我拿QQ的截图随便截了悠嘻猴里的一个小猴子的3个帧的动作，将他们循环播放来模拟一个动画。但图像截的很烂，谁能给提供个素材先谢谢了。
动画的原理：
其实就是一系列的图在迅速的东。动画中的图像叫帧，frame，每一帧有自己显示的时间，不一定相同，有的显示300毫秒，有的可能是100毫秒。
我们用Animation这么一个类来描述动画。
首先建立一个模拟每一帧动画的类AnimationFrame

package com.jsheng.game.util;

import java.awt.Image;

/** function:
 * company: jsheng
 * @author wanghn      [e-mail]
 */
public class AnimationFrame {
	Image image;
	long endTime;
	public AnimationFrame(Image image, long endTime) {
		this.image = image;
		this.endTime = endTime;
	}
}

package com.jsheng.game.util;

import java.awt.Image;
import java.util.ArrayList;

public class Animation {
	private ArrayList<AnimationFrame> frames;  		//帧
	private int currentFrameIndex;    				//当前帧
	private long animationTime;							//时间
	private long total;  							//总时间

    public Animation() {
        frames = new ArrayList<AnimationFrame>();
        total = 0;
    }
    public  void addFrame(Image image,
        long time){
    	total += time;
        frames.add(new AnimationFrame(image, total));
    }

    public  void update(long passedTime) {
        if (frames.size() > 1) {
            animationTime += passedTime;
            if (animationTime >= total) {
                animationTime = animationTime % total;
                currentFrameIndex = 0;
            }
            while (animationTime > getFrame(currentFrameIndex).endTime) {
            	currentFrameIndex++;
            }
        }
    }

    public  Image getImage() {
        if (frames.size() == 0) {
            return null;
        }
        else {
            return getFrame(currentFrameIndex).image;
        }
    }


    private AnimationFrame getFrame(int i) {
        return frames.get(i);
    }

}

测试：

测试：
package com.jsheng.game.test1;
import java.awt.*;

import javax.swing.ImageIcon;
import javax.swing.JFrame;

import com.jsheng.game.util.Animation;
import com.jsheng.game.util.MyScreenMgr;
/** function:
 * company: jsheng
 * @author wanghn      [e-mail]
 */
public class FullScreenTest3 extends JFrame {

	private static final long serialVersionUID = 1L;
	private Image bgImage;
	private Image myImage;
	private Image myImage2;
	private boolean flag;
	private MyScreenMgr  screen;
	private Animation anim;
	
	public static void main(String[] args) {

        DisplayMode displayMode = new DisplayMode(800, 600, 16,
                DisplayMode.REFRESH_RATE_UNKNOWN);
        FullScreenTest3 test = new FullScreenTest3();
        test.run(displayMode);
    }
	public void loadImages() {
		bgImage = loadImage("images/bg.jpg");
        Image p1 = loadImage("images/1.jpg");
        Image p2 = loadImage("images/2.jpg");
        Image p3 = loadImage("images/3.jpg");
        anim = new Animation();
        anim.addFrame(p1, 150);
        anim.addFrame(p2, 250);
        anim.addFrame(p1, 150);
        anim.addFrame(p2, 150);
        anim.addFrame(p3, 200);
        anim.addFrame(p2, 150);
        flag = true;
    }
	
    private Image loadImage(String fileName) {
        return new ImageIcon(fileName).getImage();
    }
    
    //动画循环
    public void animationLoop() {
        long startTime = System.currentTimeMillis();
        long currTime = startTime;
        while (currTime - startTime < 4000) {
        	long nowTime = System.currentTimeMillis();
            long elapsedTime = nowTime - currTime;
            currTime += elapsedTime;
            anim.update(elapsedTime);
            Graphics g =
                screen.getFullScreenWindow().getGraphics();
            draw(g);
            g.dispose();
            try {
                Thread.sleep(20);
            }
            catch (InterruptedException ex) { }
        }

    }
    public void run(DisplayMode displayMode) {
    	 screen = new MyScreenMgr();
         try {
             screen.setFullScreen(displayMode, new JFrame());
             loadImages();
             animationLoop();
         }
         finally {
             screen.reScreen();
         }
    }

    //将方法提取出来
    public void draw(Graphics g) {
          if (flag) {
        	  g.drawImage(bgImage, 0, 0, null);
        	  g.drawImage(anim.getImage(), 0, 0, null);
             
          }
          else {
        	  g.drawString("正在读取图片", 5, 24);
          }
    }
}