package com.zuidaima.swing;

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 image = this.createImage(WIDTH, HEIGHT);

Graphics pic = image.getGraphics();

// 绘制图形

for (int i = 0; i < 100; i++) {

for (int j = 0; j < 100; j++) {

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(image, 0, 0, this);

}

}

public static void main(String[] args) {

new Cardioid();

}

}

转自:http://www.oschina.net/code/snippet_1591393_36195