package Demo;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.JFrame;
@SuppressWarnings("serial")
class Cardioid extends JFrame
//定义窗口大小
private static final int WIDTH = 480;
private static final int HEIGHT = 600;
//获取屏幕大小
private static int WINDOW_WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width;
private static int WINDOW_HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height;
//构造函数
public Cardioid(){
//设置窗口标题
super("形线");
//设置背景色
this.setBackground(Color.BLACK);
//设置窗口位置
this.setLocation((WINDOW_WIDTH - WIDTH)/2, (WINDOW_HEIGHT - HEIGHT)/2);
//设置窗口大小
this.setSize(WIDTH, HEIGHT);
//设置窗口布局
this.setLayout(getLayout());
//设置窗口可见
this.setVisible(true);
//设置窗口默认关闭方式
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
public void paint(Graphics g){
double x,y,r; //横纵坐标及半径
Image p_w_picpath = this.createImage(WIDTH, HEIGHT);
Graphics pic = p_w_picpath.getGraphics();
//绘制图形
for (int i = 0; i < 100; i++)
for (int j = 0; j < 100; j++)http://www.huiyi8.com/gundongdaima/图片滚动代码
r = Math.PI / 45 + Math.PI / 45 * i * (1 - Math.sin(Math.PI / 45 * j)) * 18;
x = r * Math.cos(Math.PI / 45 * j) * Math.sin(Math.PI / 45 * i) + WIDTH / 2;
y = -r*Math.sin(Math.PI / 45 * j) + HEIGHT / 2;
pic.setColor(Color.MAGENTA);
pic.fillOval((int)x, (int)y, 2, 2);
//生成图片
g.drawImage(p_w_picpath,0,0,this);
public class CardioidDemo{
public static void main(String[] args){
new Cardioid();java
