9 replies to this topic

[pizza box]

I''m programming a tetris-style game using Window''s GDI. Every time I draw a rectangle it stays on the screen when I draw the next one, so I would leave a trail of rectangles whenever I moved the block. To solve this, I drew a big black rectangle the size of the screen to clear it before drawing the next frame, but I was wondering if there was a faster way to clear the screen, or perhaps a function that I could use? Thanks

[Badone]

Have you tried just drawing a black box over the tetris box? So you can use the same code that you used to draw the box but with black instead of your color.

[Floppy]

Are you double buffering?

[pizza box]

Thats what Ive been doing, but the box I draw is the entire screen so it clears out everything. The problem is that I can see the blocks flickering, so it is kind of slow. I was wondering if there are any built-in functions to solve this.

[Dharma]

You dont have to draw a black box over the entire screen. Just a black one on same place and same size but black... Or double buffer. (drawing everything on a invisible area then copy it all to the screen.

/Mario

Mvh Mario..

Edited by - Dharma on December 13, 2001 8:21:03 PM

[Floppy]

What API are you in? Doing double buffering by putting a black square over the screen is not double buffering. OpenGL uses this:

// Swap the buffers (double-buffering) SwapBuffers(window->hDC);

[Dharma]

If you will stick to using GDI... Below you have a link describing this.

http://www.winprog.org/tutorial/references.html

Mvh Mario..

[atcdevil]

Hey, try the function BitBlt

[Dharma]

Sorry bad link.. this should work fine

http://www.winprog.org/tutorial-old/

Mvh Mario..

[pizza box]

Thanks for the link. I wasn''t double buffering before, I had a late post. Hopefully things will run a little smoother now. Thanks