tomataolindao

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package aula3;

import javax.swing.JFrame;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JOptionPane;

/**
 *
 * @author aluno
 */
public class aula3 extends JFrame{

     aula3(){
        setSize(840, 480);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

     @Override
    public void paint(Graphics g) {


        int r  = 150;
	int cx = 200;
	int cy = 200;

        //entrada dos lados do poligono
	//int l = 10;

        String a = JOptionPane.showInputDialog("Total de lados: ");
        int l = Integer.parseInt(a);

	Polygon p = new Polygon();

	for (int i=0; i < l; i++){
            p.addPoint(
                (int) (cx + (r * Math.cos(i * 2 * Math.PI/l))),
                (int) (cy + (r * Math.sin(i * 2 * Math.PI/l)))
            );
        }

	g.setColor(Color.MAGENTA);
	g.drawPolygon(p);

    }

    public static void main(String[] args) {
        // TODO code application logic here
           new aula3();

    }



}