From: jerry AT eteklabs DOT nospam DOT com (Jerry Lawrence)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Writing Sprite Editor for Allegro Need help, (Source Included)
Date: Sun, 26 Apr 1998 15:35:24 -0400
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References: <354346ed DOT 0 AT daisy DOT ans DOT com DOT au> <L4WF0BASL1Q1Ewev AT talula DOT demon DOT co DOT uk>
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In article <L4WF0BASL1Q1Ewev AT talula DOT demon DOT co DOT uk>, 
Shawn AT talula DOT demon DOT co DOT uk says...
> WWynd's writes:

> 
> >Rotating a BMP 90degrees
> 
> You could use the Allegro rotate_sprite() function. Or, since this is
> fixed to a right angle, just make a loop that scans through an image
> calling getpixel(), and putpixel() to write each value to a new
> location: this rotation is just a matter of flipping the two axis.


Incidently, Shawn, at very low resolutions, ie 8x8 pixels, the sprite 
rotate functions lose a pixel row on the top and left side (i believe)
I am working on a arcade game graphics editor, AGE, which uses Allegro
as a graphics library, and I was adding a set of tools, rotate, slide,
flood fill, etc... and i found i could use the allegro analogs.  It
wa then that i found this rotate behavior.  I made a simple nested-for
to rotate it, lossless.

just thought yo might want to know.

	-jerry