//RegularPolygon.java
//applet
import java.awt.Graphics;

import javax.swing.*;

public class RegularPolygon extends JApplet {

    final int radius=300, xcenter=300, ycenter=300;

    int sides;

    
    public void init() {
	String input;
	
	input = JOptionPane.showInputDialog("Enter # of sides of regular polygon");
	
	sides = Integer.parseInt(input);
    }
    
    public void paint(Graphics g) {
	super.paint(g); 
	
	int[][] points = new int[2][sides];

	//calculate the coords of the points
	double angle;     //radians
	for (int i=0; i<sides; i++) {
	    angle = i * 2 * Math.PI / sides;
	    points[0][i] = (int) (Math.cos(angle) * radius + xcenter);
	    points[1][i] = (int) (Math.sin(angle) * radius + ycenter);
	}

	//draw a line between successive vertices
	//for (int i=0; i<sides; i++)
	//  g.drawLine(points[i][0],points[i][1],
	//	    	   points[(i+1)%sides][0],points[(i+1)%sides][1]);
    
	g.drawPolygon(points[0], points[1], sides); 
    
	showStatus(sides + "-gon");
    }
}