How do you have two classes drawing to the same JPanel? Graphics g problem

Question

Hi all,
This is probably a five second answer but im really stuck on it!
How do i have two classes both writing to the same JPanel?
I have one class that extends JPanel and using Graphics g, draws to the panel ie g.drawString(..);
But i would like another class to draw to the same panel, so that the two different classes can both draw what they like to the JPanel.
How do i do this?
I have tried sending the Graphics g object from the one class to the other but only the original class draws still. I was thinking perhaps if it carn't be done could i have a JPanel on top of the other one that is transparent so there would be a tracing paper effect?
Many thanks

Answer 1

I have tried sending the Graphics g object from the
one class to the other but only the original class
draws still. I was thinking perhaps if it carn't beThis is the right idea. One problem you may be running into is that JPanel fills in its background with the background color by default. If you switch and use JComponent instead of JPanel you may get better results. Another idea is to use a "painter": a class that has a paint(Graphics g) but is not a component and just paints on a component. I've done this before in implementing Tetris where the dropping piece is a class which can paint itself but is not a component.