Java implements Chinese Valentine's Day confession artifact

package ddd;
 
import java.awt.*;
 
import javax.swing.JFrame;
 
public class Cardioid extends JFrame {
 
	//获取屏幕大小
	private static final int WIDTH = 500;
	private static final int HEIGHT = 500;   
 
	private static int WINDOW_WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width;
	private static int WINDOW_HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height;
	
	public Cardioid(){
		super("I love you");//设置窗口标题
		this.setBackground(Color.BLACK);
		this.setLocation((WINDOW_WIDTH-WIDTH)/2,(WINDOW_HEIGHT-HEIGHT)/2);//设置窗口位置
		this.setSize(WIDTH, HEIGHT);//设置窗口大小
		this.setLayout(getLayout());//设置窗口布局
		this.setVisible(true);//设置窗口可见
		this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);//设置窗口默认关闭方式
	}
	
	public void paint(Graphics g){
		double x,y,r;//横纵坐标以及半径
		Image image = this.createImage(WIDTH, HEIGHT);
		Graphics pic = image.getGraphics();
		for (int i = -2; i < 90; i++) {
			for (int j = -2; j < 90; 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/3;
				pic.setColor(Color.MAGENTA);
				pic.fillOval((int)x, (int)y, 2, 2);
			}
			g.drawImage(image,0,0,this);//生成图片
		}
	}
	
	
	public static void main(String[] args) {
		new Cardioid();
	}
}