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    <p>You have lots-o-choices depending on what you want to achieve...</p> <p>You can...</p> <ul> <li>Create a <code>PathIterator</code> from the shape object, using a <code>AffineTransform</code> matching your rotational requirements. This will require you to create a new path, appending the <code>PathIterator</code> to it so you can paint it ... or</li> <li>Create a new <code>Path2D</code> using the shape to be rotated as the base for the new path and passing the <code>AffineTransform</code> to it. This is pretty much the same as the first option, but requires less code...</li> </ul> <p>Here's an example....</p> <pre><code>public class SpinningTriangle { public static void main(String[] args) { new SpinningTriangle(); } public SpinningTriangle() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new SpinPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class SpinPane extends JPanel { private Triangle triangle; private float angle = 0; public SpinPane() { triangle = new Triangle(50, 100); Timer timer = new Timer(40, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { angle += 2; repaint(); } }); timer.setRepeats(true); timer.setCoalesce(true); timer.start(); } @Override public Dimension getPreferredSize() { return new Dimension(110, 110); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); Rectangle bounds = triangle.getBounds(); // PathIterator pi = triangle.getPathIterator(AffineTransform.getRotateInstance(Math.toRadians(angle), bounds.width / 2, bounds.height / 2)); // Path2D path = new Path2D.Float(); // path.append(pi, true); Path2D path = new Path2D.Float(triangle, AffineTransform.getRotateInstance(Math.toRadians(angle), bounds.width / 2, bounds.height / 2)); int x = (getWidth() - bounds.width) / 2; int y = (getHeight() - bounds.height) / 2; g2d.translate(x, y); g2d.setColor(Color.RED); g2d.fill(path); g2d.setColor(Color.YELLOW); g2d.draw(path); g2d.dispose(); } } public class Triangle extends Path2D.Float { public Triangle(int width, int height) { moveTo(width / 2f, 0); lineTo(width, height); lineTo(0, height); closePath(); } } } </code></pre> <p><strong>UPDATED</strong></p> <p>If all you want to do is "mirror" the shape, you can scale the axis by <code>-1</code>...</p> <pre><code>public class SpinningTriangle { public static void main(String[] args) { new SpinningTriangle(); } public SpinningTriangle() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new FlipPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class FlipPane extends JPanel { private Triangle triangle; private boolean flip; public FlipPane() { triangle = new Triangle(50, 100); Timer timer = new Timer(500, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { flip = !flip; repaint(); } }); timer.setRepeats(true); timer.setCoalesce(true); timer.start(); } @Override public Dimension getPreferredSize() { return new Dimension(110, 110); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); Rectangle bounds = triangle.getBounds(); double scale = 1 * (flip ? -1 : 1); Path2D path = new Path2D.Float(triangle, AffineTransform.getScaleInstance(scale, scale)); int x = (getWidth() - bounds.width) / 2; int y = (getHeight() - bounds.height) / 2; if (flip) { y += bounds.height; x += bounds.width; } g2d.translate(x, y); g2d.setColor(Color.RED); g2d.fill(path); g2d.setColor(Color.YELLOW); g2d.draw(path); g2d.dispose(); } } public class Triangle extends Path2D.Float { public Triangle(int width, int height) { moveTo(width / 2f, 0); lineTo(width, height); lineTo(0, height); closePath(); } } } </code></pre>
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