Question

I have a composite tree. I’ve drawn this tree to a JPanel width Graphics object via overriding paintComponent(Graphics gr). My problem is: how can I access which component is clicked?

I only figured out trivial and bad solutions, so that’s why I turn to you. Thanks in advance!

Answer 1

The shapes you have drawn, you need to store.
When you receive a Mouse clicked event:

public void mouseClicked(MouseEvent e) {

you will have x and y from

    e.getPoint().getX()
    e.getPoint().getY()

You can then traverse your shapes, and see if a Shape contains the point above. From the Javadoc of Shape:

/**
 * Tests if the specified coordinates are inside the boundary of the
 * <code>Shape</code>, as described by the
 * <a href="{@docRoot}/java/awt/Shape.html#def_insideness">
 * definition of insideness</a>.
 * @param x the specified X coordinate to be tested
 * @param y the specified Y coordinate to be tested
 * @return <code>true</code> if the specified coordinates are inside
 *         the <code>Shape</code> boundary; <code>false</code>
 *         otherwise.
 * @since 1.2
 */
public boolean contains(double x, double y);