How do you keep the graphics on the screen with AWT?

Hi. I have been playing around with applets a lot lately and I keep coming to the same problem. Once the applet is loaded, if you draw something in it and then move another window in front of your applet the thing you originally drew disappears. I have been wondering how to avoid that problem for a while but I can't figure out how except to keep a bitmap or double array of color values for every pixel in the applet and then redraw the entire thing every few milliseconds. I also noticed that the same thing happens to java window panes, unless you use Swing. I found out about it pretty much yesterday (the fact that swing automatically refreshes the missing portion of the graphics), but I would prefer not to use swing unless it is really that big of an improvement. The reason being that I want to learn how they managed doing the refresh without using up massive amounts of your computer's concentration. Does anyone have an answer?

TheGrandGoblin wrote:
Hi. I have been playing around with applets a lot lately and I keep coming to the same problem. Once the applet is loaded, if you draw something in it and then move another window in front of your applet the thing you originally drew disappears.That's a bug (with your code).
I have been wondering how to avoid that problem for a while but I can't figure out how except to keep a bitmap or double array of color values for every pixel in the applet and then redraw the entire thing every few milliseconds.You don't have to do that.
When a component in a AWT or Swing GUI is made viewable (after having been uncovered as you describe, or being de-iconified, or at the program's request) then the GUI thread calls the paint() (or in Swing, paintComponent()) method.
Your program should provide a reasonable implementation of paint() or paintComponent().
I also noticed that the same thing happens to java window panes, unless you use Swing. I found out about it pretty much yesterday (the fact that swing automatically refreshes the missing portion of the graphics), So does AWT.
but I would prefer not to use swing unless it is really that big of an improvement. The reason being that I want to learn how they managed doing the refresh without using up massive amounts of your computer's concentration. Does anyone have an answer?This should have been covered in just about any introductory tutorial or book about AWT or Swing. I'm surprised you didn't see it. (Well actually maybe not. Sun is pushing Swing hard and as I recall they don't exactly make it easy to find AWT tutorials.)
Edited by: paulcw on Feb 6, 2008 7:08 PM

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How do you keep the graphics on the screen with AWT?

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