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paintComponent JPanel

Mathias Nilsson
Ranch Hand

Joined: Aug 21, 2004
Posts: 367

I have a JPanel that overrides the paintComponent method. I paint a rule from -10 to 470 mm

I do not want to repaint the whole component but when the mouse moves I need to set a red marker where the mouse is in the rule. How can I do this whithout repainting the whole JPanel?

Craig Wood
Ranch Hand

Joined: Jan 14, 2004
Posts: 1535
Using an offscreen image for the unchanging part of the graphics and drawing the marker on
top of it (between the image and the user) is one standard way.
Mathias Nilsson
Ranch Hand

Joined: Aug 21, 2004
Posts: 367

I'll look into the code
I agree. Here's the link:
subject: paintComponent JPanel
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