Java画三维爱心

import java.applet.*;
import java.awt.*;
public class Heart extends Applet
{
	int AppletWidth,AppletHeight;
	Image OffScreen;
	Graphics drawOffScreen;
	public void init ()
	{
		setBackground(Color.black);
		AppletWidth=700;
		AppletHeight=700;
		OffScreen =createImage(AppletWidth,AppletHeight);
		drawOffScreen =OffScreen.getGraphics();
	}
	public void paint (Graphics g)
	{
		drawOffScreen.clearRect(0, 0, AppletWidth, AppletHeight);
		drawOffScreen.setColor(Color.green);
		int i,j;
		double x,y,r;
		for(i=0;i<180;i++)
		{
			for(j=0;j<180;j++)
			{
				r=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)+AppletWidth/2)*1;
				y=(-r*Math.sin(Math.PI/45*j)+AppletHeight/4)*1.01;
				drawOffScreen.fillOval((int)x,(int)y, 2, 2);
				try
				{
					//Thread.sleep(1);
				}catch(Exception e){}
			}
		}
		g.drawImage(OffScreen, 0, 0, this);
	}
}