Removing graphical trash from JLayeredPane

[Andrew Ryaskov]

Hi everybody!
Help me to remove this graphical artifact from JLayeredPane:

There is a simple app with drawing panel(Scene) inherited from JLayeredPane and graphical objects on it - inherited from JComponent with overridden paintComponent():

If zoom == 1.0 ( g.scale(1.0, 1.0) in Scene's paint() method ) it's OK - moving objects in scene dont lead to graphical artifacts:


But if I set zoom greater or lower than 1.0, I've got some bugs while moving objects by mouse:


How to remove this "trace"?

Thank you!

[Rob Camick]

A JComponent doesn't repaint its background. So I'm guessing you need to add code to do this in the paintComponent() method. Something like:

g.fillRect(0, 0, getSize().width, getSize().height);

[Rob Spoor]

Or extend JPanel instead of JComponent; don't forget to call super.paintComponent(g) as the first statement in the overridden paintComponent method, or you'll get the same result.