Quick C# Drawing question

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So lets say I made a program to draw a bunch of rectangles on the screen, and then I have a circle which I can move around the screen with arrow keys.

Is there a way to tell C# to only redraw the circle when I move it instead of having to redraw absolutely everything on the screen? It just seems a bit wasteful to have to redraw every rectangle on the screen when I'm only moving the circle :(

Posted 9-Oct-10 7:11am

Raztor0

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Ashok Gowtham · Accepted Answer · 2010-10-09T07:15:00

Solution 1

Have the "background" rectangles painted to a bitmap.
Then at each circle-update overlay the circle onto a copy of that bitmap and blit it(display it).

Posted 9-Oct-10 7:15am

Ashok Gowtham

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Raztor0 9-Oct-10 13:37pm

Okay so I figured out how to display the rectangles as a bitmap, but I can't figure out what you mean be "overlay the circle onto a copy of the bitmap". Am I supposed to redraw the bitmap every time and draw the circle over it?

Also, if it means anything, the circle in my case is actually a .PNG, don't know if it changes anything but just thought I should mention it.