Re: Double buffer help


"Ian Shef" <invalid@xxxxxxxxxxxxx> wrote in message
news:Xns979C800D25A1Bvaj4088ianshef@xxxxxxxxxxxxxxxxxx
"Martin" <zedolf@xxxxxxxx> wrote in news:c9adncRoxOlOOazZRVnyiA@xxxxxxxxx:


Brilliant!

No, but thanks.

Yep my timer thread was calling repaint().
I had a quick Google and found an example of using the update() method.

An excellent resource for painting issues is
"Painting in AWT and Swing":

http://java.sun.com/products/jfc/tsc/articles/painting/index.html



I simply duplicated the code from my paint() method in the update()
method and gave that a try and it's perfect.
Nooooooooooooo !!

You are setting yourself up for a maintenance and debug nightmare.
Provide the code in only ONE place!
Either:
1) Locate the code in paint(), and have update() call paint(), OR
2) Locate the code in update(), and have paint() call update(), OR
3) Locate the code in a new method, and have both paint() and update(0
call the new method.

The flicker has disappeared.

Glad to hear it.

I've updated the temporary webpage too - both the old (flickering)
applet and the new improved applet can both be seen in action.
http://www.warwound.dsl.pipex.com/applet/panViewer.htm

Nice contrast between the two cases. Thanks, I rarely get to see such a
visible result of my advice.

Thanks a lot - very easy and quick for me to fix it once i was pointed
in the right direction.

Martin.



Happy to have helped.
-- Ian



--
Ian Shef 805/F6 * These are my personal opinions
Raytheon Company * and not those of my employer.
PO Box 11337 *
Tucson, AZ 85734-1337 *

Thanks for the advice about duplicating the drawing code.

I've rewritten my applet and created a new method which i've called
displayRedraw() and moved the code to that method.
Then both paint() and update() methods merely call my new displayRedraw()
method and all works as before - even makes the compiled class file a very
little bit smaller too.

I'll take a look at the "Painting in AWT and Swing" link later when i have
more time.

Thanks again.

Martin.


.

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