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Newcomers DBPro Corner / basic2d disappears after sync

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fraktal
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Posted: 9th Jan 2008 00:43 Edited at: 9th Jan 2008 11:19
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I'm trying to do some 2d drawing in what will be a 3d program. It appears that after you sync, you lose whatever you drew...
I know this is probably not the case if you don't set up a 3d environment (which I have - not shown). I tried drawing to a bitmap and then copying that to the screen, but the same thing happens.
Basically, I see a rows of lbocks chasing each other down the screen, when I want to see a picture slowly being built (ie, the previous blocks are retained). Any ideas?


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BatVink
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Posted: 9th Jan 2008 09:47
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Anything using 2D drawing functions has to be redrawn every cycle. DB Pro's 2D drawing capabilities are quite slow. So you have 3 options:

1. Draw to a bitmap, and paste the bitmap to the screen each time

2. Draw to a bitmap, then convert the bitmap to a sprite which will retain the detail between SYNCs

3. Use Cloggy's D3D plugin, which is much faster at drawing.
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fraktal
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Posted: 9th Jan 2008 11:25
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Ah, okay.

But, the above code (which I know has some syntax errors, but you know what I mean) draws to a bitmap, and then pastes the bitmap. How come it doesn't work?

If I get rid of the sync in the middle then when I do sync the whole lot appears, but using it in the loop seems to remove the drawings from the bitmap, too.
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IanM
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Posted: 9th Jan 2008 14:53
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Only bitmap 0 is ever displayed. If you want to see something, that's where the results need to end up.

[b]Utility plugins collection (updated 23/12/07) and
http://www.matrix1.demon.co.uk
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pcRaider
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Posted: 9th Jan 2008 18:18
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this bitmap demo

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fraktal
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Posted: 12th Jan 2008 14:08
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For some reason in my original problem I was drawing to an off-screen bitmap and then copying it to the screen, and it would revert the bitmap after each sync. I have implemented it in a different way now, so maybe it was a bug in my code.
Thanks for your help!
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