Animation on screen DC

I've been trying to animate a bitmap onto the screen DC, but haven't been able to manage it properly. I can animate bitmaps fine on forms etc with bitblt, but the screen DC is different as there is no .cls and .refresh.

The main problem is that I have not been able to get rid of the flickering caused by using redrawwindow (so that the bitmap doesn't leave a copy of itself behind as it moves around). Does anyone know of a way to stop the screen from refreshing until it has been cleared and the bitmap redrawn?

Cheers... :)

well this is how I did it:

first I copied the part of the screen that I wanted to do the animation on than I blitted my pic on that copy and blitted it back instead of cleaning up the screen by the redrawWindow thing...
I hope you got me...

Yup, I think I got you.. trouble is that when I blit straight from the screen DC to the backbuffer it still has the last frame's picture on it.. i.e. I need to clean off everything i'd already blitted before the next frame, otherwise the next frame will include everything for the last frame. Or am I missing something?

that is true that is why you have to make a copy first don't blit the copy of the screen directly on the backbuffer but into a dc first than from that dc to the backbuffer and than you animpic... pretty straight....

well I just saw you are on right this moment
so if you want to add me to icq the number in my signature is my UIN

Yeh, thats one option.. but what if the user moves/minimises/maximises/loads/unloads a window? This isn't reflected in the backbuffer, which still shows the screen in the state it was when the animation first started.

I suppose you could redraw the screen and refresh the backbuffer every second or so.. hopefully then both the flicker and the ghost effect caused by a moving window wouldn't be too noticeable. I was hoping that there would be a better solution, though.

Thanks for the help, btw :)

you could check for new windows beeing created...

well I can see your problem, I will think about it.
my animation was a little ostrich running over the screen so it never remained at one place for a longer time anyways so I had to do a lot more of getting a writing to the desktop dc anyways.. (I only wrote lines, so I would not have to blt to much to the desktop since this is the critical moment that creates flikering)