Java tutorial
import java.awt.Container; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Shape; import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D; import javax.swing.JComponent; import javax.swing.JFrame; public class Main { public static void main(String[] args) { JFrame jf = new JFrame("Demo"); Container cp = jf.getContentPane(); MyCanvas tl = new MyCanvas(); cp.add(tl); jf.setSize(300, 200); jf.setVisible(true); } } class MyCanvas extends JComponent { public void paint(Graphics g) { Shape shape = new Rectangle2D.Float(100, 50, 80, 80); Graphics2D g2 = (Graphics2D) g; AffineTransform at = AffineTransform.getRotateInstance(-Math.PI / 6, -Math.PI / 6); g2.setTransform(at); g2.draw(shape); } }