桌球小游戏入门 java.zip

import java.awt.*; import javax.swing.*; public class BallGame2 extends JFrame{ //加载图片 Image ball = Toolkit.getDefaultToolkit().getImage("images/ball.png"); Image desk = Toolkit.getDefaultToolkit().getImage("images/desk.jpg"); double x = 100; //小球横坐标 double y = 100; //小球纵坐标 double degree = 3.14/3; //弧度 60度角 //绘制 paint public void paint(Graphics g) { x = x + 10 * Math.cos(degree); y = y + 10 * Math.sin(degree); //碰到上下边界 关于x轴对称 if(y>500-40-30||y<40+40) { //500是窗口高度 40是桌子边框 30是球直径 最后一个40是标题栏的高度 degree = -degree; } //碰到左右边界 关于y轴对称 if(x<0+40||x>856-40-30) { degree = 3.14 - degree; } System.out.println("窗口被画了一次!"); g.drawImage(desk,0,0,null); g.drawImage(ball, (int)x, (int)y,null); } //出现窗口 窗口加载 void launchFrame() { setSize(856,500); setLocation(400,400); setVisible(true); //重画窗口 每秒画25次 while(true) { repaint(); try { Thread.sleep(40); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static void main(String[] args) { System.out.println("我在学尚学堂的java教程"); BallGame2 game = new BallGame2(); game.launchFrame(); } }