How do I draw a rectangle in Java 2D?
Date: 2012-05-21. Category: 2D Geometry examples. Hits: 1K time(s).
The code snippet below show you how to use the Graphics2D class the draw a rectangle. You can see the snippet in the paintComponent(Graphics g) method defined in the anonymous JPanel object.
To draw a rectangle we use the Rectangle2D.Double static-inner class. The constructor of this class accept the information about the rectangle x, y coordinates and its witdh and height.
package org.kodejava.example.awt.geom;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.Rectangle2D;
public class DrawRectangle {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame("Draw Rectangle");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.add(new JPanel() {
@Override
protected void paintComponent(Graphics g) {
//
// Draw a rectangle using Rectangle2D class
//
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.RED);
double x = 100;
double y = 100;
double width = x + 200;
double height = y + 50;
//
// Draw the red rectangle
//
g2.draw(new Rectangle2D.Double(x, y, width, height));
g2.setColor(Color.BLUE);
//
// Draw the blue rectangle
//
g2.draw(new Rectangle2D.Double(150, 50, 200, 250));
}
}, BorderLayout.CENTER);
frame.pack();
frame.setSize(new Dimension(500, 400));
frame.setVisible(true);
}
});
}
}
Here is the result you'll get when you run the snippet:
