Painting in Swing, blinking issue

Question

I have the following problem in swing.
I'm implementing basic drawing operations (lines, shapes). When I'm moving mouse with pressed left button, I need to repaint current shape. So I clear the screen and repaint already drawn shapes and currently being drawn one.
Shapes are drawn in paint() method and on mouse move event I call repaint() (paint() is called automatically). The problem is that the screen is blinking strongly on each repaint and it looks really ugly. Please tell me, what I'm doing wrong? Thanks.

Answer 1

I think what you are looking for is double buffering.

Answer 2

Shapes are drawn in paint()

Custom painting should be done in the paintComponent() method and make sure you invoke super.paintComponent() as the first line.

Also custom painting is done on a JPanel (or JComponent), not on the JFrame directly.