Java Game Development(24) - Watching the Sprite Move

import java.awt.*;

import javax.swing.*;

public class apples{

public static void main(String[] args){

apples a = new apples();

a.run();

}

private Sprite sprite;

private Animation ani;

private ScreenManager s;

private Image bg;

private static DisplayMode modes1[] = {

new DisplayMode(800, 600, 32, 0),

new DisplayMode(800, 600, 24, 0),

new DisplayMode(800, 600, 16, 0),

new DisplayMode(640, 480, 32, 0),

new DisplayMode(640, 480, 24, 0),

new DisplayMode(640, 480, 16, 0),

};

//加載圖像和添加場景

public void loadImages(){

bg = new ImageIcon("C:\\baby.jpg").getImage();

Image face1 = new ImageIcon("C:\\baby1.png").getImage();

Image face2 = new ImageIcon("C:\\baby2.png").getImage();

ani = new Animation();

ani.addScene(face1,250);

ani.addScene(face2,250);

sprite = new Sprite(ani);

sprite.setVelocityX(0.3f);

sprite.setVelocityY(0.3f);

}

//主要的方法(main method)

public void run(){

s = new ScreenManager();

try{

DisplayMode dm = s.findFirstCompatibleMode(modes1);

s.setFullScreen(dm);

loadImages();

movieLoop();

}finally{

s.restoreScreen();

}

}

//播放電影

public void movieLoop(){

long startingTime = System.currentTimeMillis();

long cumTime = startingTime;

while(cumTime - startingTime < 6000){

long timePassed = System.currentTimeMillis() -cumTime;

cumTime += timePassed;

update(timePassed);

//繪製和更新屏幕

Graphics2D g = s.getGraphics();

draw(g);

g.dispose();

s.update();

try{

Thread.sleep(20);

}catch(Exception ex){}

}

}

//繪製圖形

public void draw(Graphics g){

g.drawImage(bg, 0, 0,null);

g.drawImage(sprite.getImage(), Math.round(sprite.getX()), Math.round(sprite.getY()),null); → 獲取圖像，X和Y在Sprite.java

}

//更新動畫

public void update(long timePassed){

if(sprite.getX() < 0){

sprite.setVelocityX(Math.abs(sprite.getVelocityX()));

}else if(sprite.getX() + sprite.getWidth() >= s.getWidth()){

sprite.setVelocityX(-Math.abs(sprite.getVelocityX()));

} → 如果圖像的寬度小於X，X將正數 如果圖像的寬度比屏幕寬度更大，X會負數

if(sprite.getY() < 0){

sprite.setVelocityY(Math.abs(sprite.getVelocityY()));

}else if(sprite.getY() + sprite.getHeight() >= s.getHeight()){

sprite.setVelocityY(-Math.abs(sprite.getVelocityY()));

} → → 如果圖像的高度小於Y，Y將正數 如果圖像的高度比屏幕高度更大，Y會負數

sprite.update(timePassed);

}

}

如果你運行這個程序動畫會在屏幕上移動(如果動畫觸摸屏幕的邊界，動畫會彈回來)