package exercicio2_1;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Exercicio2_1 extends JApplet {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setTitle("Exercicio2_1");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JApplet applet = new Exercicio2_1();
        applet.init();
        frame.getContentPane().add(applet);
        frame.pack();
        frame.setVisible(true);

    }

    public void init() {
        JPanel panel = new Exercicio2_1Panel();
        getContentPane().add(panel);
    }
}

class Exercicio2_1Panel extends JPanel {

    int nPoints = 1000;

    public Exercicio2_1Panel() {
        setPreferredSize(new Dimension(400, 400));
        setBackground(Color.BLUE);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        
         g2.translate(200, 200);
         g2.setColor(Color.black);
         
        int X1 = 0;
        int Y1 = 0;
        int X2;
        int Y2;
 
        for (int i = 0; i < nPoints; i++) {
            double t = i * (8 * Math.PI / nPoints);
            X2 = (int) (20 * (t) * Math.cos(t)) / 3;
            Y2 = (int) (20 * (t) * Math.sin(t)) / 3;

            g2.drawLine(X1, Y1, X2, Y2);
            X1 = X2;
            Y1 = Y2;

        }
    }
}