On Mon, Feb 09, 2004 at 01:31:40AM -0700, Andrei Kouznetsov wrote:
> >>no need to call drawingPanel.getGraphics() in drawMap() because you
> >have
> >>alredy Graphics from paintComponent.
> >
> >>drawingPanel = new JPanel(){
> >> public void paintComponent(Graphics g){
> >> super.paintComponent(g);
> >> drawMap((Graphics2D)g);
> >> }
> >> };
> >
> >>private void drawMap(Graphics2D g2){
> >>g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALU
> >E
> >>ANTIALIAS_ON);
> >> // custom paint code
> >> }
> >
> >If I do this, nothing is drawn! It shouldn't have any effect on
> >repainting overlapping areas, which is the problem I'm having. I'm just
> >creating an extra Graphics object.
Note that by calling component.getGraphics() you were not just
creating an extra Graphics object, but a graphics context to render
to the screen directly, bypassing the double-buffering swing
painting mechanism. In a well-behaved swing application this should
never be done for the exact reasons you're experiencing.
Andrei's suggestion is the correct way to do it.
Thank you,
Dmitri
>
> then use Graphics#create():
>
> drawingPanel = new JPanel(){
> public void paintComponent(Graphics g){
> super.paintComponent(g);
> drawMap((Graphics2D)g.create());
> //or
> //drawMap((Graphics2D)g.create(x, y, w, h));
> }
> };
>
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