使用java简单实现桌球的滚动

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本文链接： https://blog.csdn.net/qq_44213634/article/details/102761637

package pers.javacode.lzw.ballgame;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;

import javax.swing.JFrame;

public class BallGame extends JFrame {
	 //加载图片
	Image ball=Toolkit.getDefaultToolkit().getImage("images/ball.png");
	 Image desk=Toolkit.getDefaultToolkit().getImage("images/desk.jpg");
	 
	  public  void frameLunch()
	  {
		  this.setSize(856,500);
		  this.setLocation(50,50);
		  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		  this.setVisible(true);
		  while(true)
		  {
			  repaint();
			  try {
				Thread.sleep(40);
			} catch (InterruptedException e) {
				
				e.printStackTrace();
			}
		  }
		  
	  }
	  double x=100;
	  double  y=100;
	  double degree=3.14/4;//对应的是60度
	  public void paint(Graphics g)
	  {
		  
		  g.drawImage(desk,0,0,null);
		  g.drawImage(ball,(int)x,(int)y,null);
		  //创建动态的小球滚动的状态
		  x  =  (x+ 10*Math.cos(degree));
	        y  = y +10*Math.sin(degree); 
	         
	        //碰到上下边界
	        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
	        if(x<40||x>856-40-30){
	            degree = 3.14 - degree;
	        }
		  
		  
	  }
	  public static void main(String[] args) {
		 BallGame ba=new BallGame();
		 ba.setTitle("Ball Game");
		 ba.frameLunch();
	}

	
}