Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!caesar.cs.montana.edu!blake!milton!uw-beaver!Teknowledge.COM!unix!hplabs!hp-pcd!hpcvlx!markc
From: markc@hpcvlx.cv.hp.com (Mark Cook)
Newsgroups: comp.graphics
Subject: Algorithms to Rotate a 2-D raster image?
Message-ID: <101880015@hpcvlx.cv.hp.com>
Date: 5 Dec 89 23:29:08 GMT
Organization: St. Vitus Hospital for the Terminally Amused
Lines: 20

I'm expanding the capabilities of an X Windows-based raster graphics
editor and I'm having some trouble finding an algorithm which will
allow me to apply an arbitrary amount of rotation to a rectangular
raster image.  I have an abbreviated copy of the Catmull-Smith 2-pass
transform, but am having trouble translating it into the appropriate
Xlib transforms.

If anyone has examples of other raster rotation schemes which I could
convert to Xlib, I'd greatly appreciate seeing how else it can be done.

Thanks in advance,

	Mark F. Cook

USMail: User Interface Technical Support
	Hewlett-Packard - Corvallis Information Systems
	1000 NE Circle Blvd.  Corvallis, OR 97330

ARPA: markc%hpcvss@hplabs.HP.COM
UUCP: {cmcl2, harpo, hplabs, rice, tektronix}!hp-pcd!hpcvss!markc