Java Examples - Display polygon using GUI

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Problem Description:

How to draw a polygon using GUI?

Solution:

Following example demonstrates how to draw a polygon by creating Polygon() object. addPoint() & drawPolygon() method is used to draw the Polygon.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Main extends JPanel {
   public void paintComponent(Graphics g) {
      super.paintComponent(g);
      Polygon p = new Polygon();
      for (int i = 0; i < 5; i++)
      p.addPoint((int) 
      (100 + 50 * Math.cos(i * 2 * Math.PI / 5)),
      (int) (100 + 50 * Math.sin(i * 2 * Math.PI / 5)));
      g.drawPolygon(p);
   }
   public static void main(String[] args) {
      JFrame frame = new JFrame();
      frame.setTitle("Polygon");
      frame.setSize(350, 250);
      frame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
            System.exit(0);
         }
      });
      Container contentPane = frame.getContentPane();
      contentPane.add(new Main());
      frame.setVisible(true);
   }
}

Result:

The above code sample will produce the following result.

Polygon is displayed in a frame.


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