桌球在球桌中按照一定线路和角度移动,遇到边框会自动弹回。
http://www.sxt.cn/Java_jQuery_in_action/Billiards_Games.html;
练手项目加速度控制
//添加速度控制的台球游戏 import java.awt.*; import javax.swing.*; public class BallGame2 extends JFrame { Image ball = Toolkit.getDefaultToolkit().getImage("images/ball.png"); Image desk = Toolkit.getDefaultToolkit().getImage("images/desk.jpg"); double x = 100; double y = 100; double degree=3.14/3; double speed=10; public void paint(Graphics g) { g.drawImage(desk, 0, 0, null); g.drawImage(ball, (int) x, (int) y, null); x=x+speed*Math.cos(degree); y=y+speed*Math.sin(degree); if(x>856-70||x<40){ degree=3.14-degree; } if(y>430||y<70){ degree=-degree; } } void launchFrame() { setSize(856, 500); setLocation(50, 50); setVisible(true); //重画窗口,每秒画25次 while (speed>1) { repaint(); long time=40+40/232; try { Thread.sleep(time); //因为前期速度较快,休眠时间不能过长,而后期速度较慢,休眠时间可以长一点 //通过时间来控制休眠时间,,避免出现前期降速太快,而后期帧数不足的情况 } catch (Exception e) { e.printStackTrace(); } speed=speed/1.01;//通过speed的匀速减小来使路程均匀减小 } } public static void main(String[] args) { BallGame2 game = new BallGame2(); game.launchFrame(); } }