How to draw a polygon using GUI?
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); } }
The above code sample will produce the following result.
Polygon is displayed in a frame.
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