The Need To Restore Graphics Original State When Overwritten paint or paintComponent

Question

I realize most of the Java code to overwritten paint or paintComponent, most of them doesn\'t restore the old state of graphics object, after they had change the state of graphi

Answer 1

You should not alter the Graphics object passed in at all, rather perform all your graphics operations on a copy of it which you then dispose. There'll be no need to reset the state at all then.

public void paintComponent(Graphics g1) {
    super.paintComponent(g1);
    final Graphics2D g = (Graphics2D)g1.create();
    try {
         // ...Whole lotta drawing code...
    } finally {
         g.dispose();
    }
}