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PocketMatrix • View topic - Problem when a sprite leaves the screen
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Problem when a sprite leaves the screen


Problem when a sprite leaves the screen

Postby Staryon » Apr 18, 2007 @ 5:18am

Last edited by Staryon on Apr 18, 2007 @ 1:09pm, edited 1 time in total.
Staryon
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Postby InexorableTash » Apr 18, 2007 @ 6:21am

Short answer: call pDestinationSurface->SetClipper( NULL ) before you do any blting and you should be set.

The default behavior is that a Blt will fail if any part of the destination rectangle is offscreen. (Basically, you've passed in invalid coordinates!)

If you set a clipper (see ), the behavior changes so that if the destination rectangle is partially outside the clipping region, the source/destination rectangles are adjusted for you.
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InexorableTash
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Postby Staryon » Apr 18, 2007 @ 7:33pm

Thanks a million for your detailed answer and for explaining how it works.

I have tried your suggestion and it works great now.

Regards.
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Joined: Nov 4, 2006 @ 12:05am


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