/*
 * 將半徑為R的圓周等分成n份,然后用直線將各分點(diǎn)兩兩相連,
 * 這樣形成的圖案稱為"金剛石"圖案
 *
 * 需要指出的是drawLine中的參數(shù)只能是整型數(shù)據(jù)
 * 如果需要實(shí)型數(shù)據(jù), 只能通過(guò)向圖形中增加Line2D.Double
 * 類對(duì)象的方法
 */

import java.awt.*;
import java.applet.*;
import java.awt.geom.*;


public class Diamond extends Applet {
	private Line2D.Double line;
	
	public void init() {
	}

	public void paint(Graphics g) {
		Graphics2D g2D = (Graphics2D)g;
		
		double t;
		int x0 = 320, y0 = 240;
		
		int n = 30,i,j,r=150;
		
		double x[],y[];
		x = new double[n];
		y = new double[n];
		t = 6.28318/n;
		for(i=0;i<n;i++) {
			x[i] = r * Math.cos(i * t) + x0;
			y[i] = r * Math.sin(i * t) + y0;
		}
		for(i = 0; i <= n - 2; i++) {
			for(j = i + 1; j <= n - 1; j++) {
				line = new Line2D.Double(x[i],y[i],x[j],y[j]);
				g2D.setPaint(Color.black);
			    g2D.draw(line);
			}
		}
	}
}