Java tutorial
import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JFrame; import javax.swing.JPanel; public class Rotate extends JPanel { public void paint(Graphics g) { super.paint(g); Graphics2D g2d = (Graphics2D) g; g2d.setColor(new Color(150, 150, 150)); g2d.fillRect(20, 20, 80, 50); g2d.translate(180, -150); g2d.rotate(Math.PI / 4); g2d.fillRect(20, 20, 80, 50); } public static void main(String[] args) { JFrame frame = new JFrame("Rotation"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new Rotate()); frame.setSize(300, 200); frame.setVisible(true); } }