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POTrigger MouseListener when pressing on my JComponent, even if it is transformed by an AffineTransform
 

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  1. POTrigger MouseListener when pressing on my JComponent, even if it is transformed by an AffineTransform
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    <p>I am trying to add a MouseListener to my custom JComponent. I just want the MouseListener to be triggered when pressing withing the bounds of the circle (the JComponent's painting method draws a circle). I have tried with the below code but I just cannot get it to work (loook especially in the <code>mousePressed</code> method). How can I tackle this problem?</p> <p>The SSCCE:</p> <pre><code>import java.awt.*; import java.awt.event.*; import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D; import javax.swing.JComponent; import javax.swing.JFrame; public class AffineTransformTest { private static TransformingCanvas canvas; public static void main(String[] args) { JFrame frame = new JFrame(); canvas = new AffineTransformTest.TransformingCanvas(); TranslateHandler translater = new TranslateHandler(); canvas.addMouseListener(translater); canvas.addMouseMotionListener(translater); canvas.addMouseWheelListener(new ScaleHandler()); frame.setLayout(new BorderLayout()); frame.getContentPane().add(canvas, BorderLayout.CENTER); frame.setSize(500, 500); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.setVisible(true); } private static class TransformingCanvas extends JComponent { private double translateX; private double translateY; private double scale; TransformingCanvas() { translateX = 0; translateY = 0; scale = 1; setOpaque(true); setDoubleBuffered(true); } @Override public void paint(Graphics g) { AffineTransform tx = new AffineTransform(); tx.translate(translateX, translateY); tx.scale(scale, scale); Graphics2D ourGraphics = (Graphics2D) g; ourGraphics.setColor(Color.WHITE); ourGraphics.fillRect(0, 0, getWidth(), getHeight()); ourGraphics.setTransform(tx); ourGraphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); ourGraphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); ourGraphics.setColor(Color.BLACK); ourGraphics.fillOval(50, 50, 50, 50); } } private static class TranslateHandler implements MouseListener, MouseMotionListener { private int lastOffsetX; private int lastOffsetY; public void mousePressed(MouseEvent e) { lastOffsetX = e.getX(); lastOffsetY = e.getY(); double width = canvas.scale * 50; double height = canvas.scale * 50; double x = (AffineTransformTest.canvas.getWidth() - width) / 2; double y = (AffineTransformTest.canvas.getHeight() - height) / 2; Rectangle2D.Double bounds = new Rectangle2D.Double(x, y, width, height); System.out.println(bounds + " " + e.getPoint()); if (bounds.contains(e.getPoint())) { System.out.println("Click!"); } } public void mouseDragged(MouseEvent e) { int newX = e.getX() - lastOffsetX; int newY = e.getY() - lastOffsetY; lastOffsetX += newX; lastOffsetY += newY; canvas.translateX += newX; canvas.translateY += newY; canvas.repaint(); } public void mouseClicked(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } public void mouseMoved(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } } private static class ScaleHandler implements MouseWheelListener { public void mouseWheelMoved(MouseWheelEvent e) { if (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) { canvas.scale += (.1 * e.getWheelRotation()); canvas.scale = Math.max(0.00001, canvas.scale); canvas.repaint(); } } } } </code></pre>
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    1. COIt is better to extend `JButton` than `JComponent` for the specific situation & BTW what do you mean by *"cannot get it to work"*
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    2. COMaybe, but this is just a SSCCE. My real code is much bigger and is using custom components derived from JComponent, so I thought this code would match my real problem better.
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    3. COWhat doesn't work is when you zoom in and out. The mouse presses are never within the bounds of the painted object when you have zoomed in or out.
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