java - putting marks on ImageIcon in JLabel

Question

So I'm trying to find a way to modify an image in Java. In other words, if user clicks on the image, a mark will be put at the point where the user just clicked. I have an ImageIcon which I put in a JLabel. So far, the approach I took was to use JLayeredPanel to put another JPanel on top of the JLabel and draw on this JPanel:

//...
ImageIcon icon = new ImageIcon("foo.jpg");
JLabel lb = new JLabel(icon);
JPanel glass = new JPanel();
lb.setBounds(0, 0, 100, 100);
glass.setBounds(0, 0, 100, 100);
glass.setOpaque(false);
LayeredPane container = new LayeredPane();
container.add(lb, 1);
container.add(glass, 2);

//...

But this way doesn't seem to work. I never see the background image (the image in lb). So I was wondering if I'm even on the right track at all? Or is there a cleaner way to achieve this?

Answer 1

You're on the right track with wanting to use another pane. In Java, there actually already is a glass pane that is designed for just this purpose. Read through this tutorial http://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html and it should help you understand.