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From: sfleming@cs.hw.ac.uk (Stewart T. Fleming)
Newsgroups: comp.windows.x
Subject: Re: Vector Fonts
Message-ID: <1815@odin.cs.hw.ac.uk>
Date: 7 Dec 90 16:09:51 GMT
References: <9011271415.AA26954@bruker.com> <2908@gazette.bcm.tmc.edu> <1990Dec4.233145.6208@sq.sq.com>
Sender: news@cs.hw.ac.uk
Reply-To: sfleming@cs.hw.ac.uk (Stewart T. Fleming)
Organization: Dept. Of Computer Science, Heriot-Watt University, Edinburgh
Lines: 26

In article <1990Dec4.233145.6208@sq.sq.com>, lee@sq.sq.com (Liam R. E. Quin) writes:
|> etaylor@wilkins.iaims.bcm.tmc.edu (Eric Taylor) writes:
|> >Here is a simplistic method for rotating text by an arbitrary angle:
|> > [...]
|> >	I2(x,y) = I(a,b)
|> >		where
|> >		a = x * cos(theta) - y * sin(theta)
|> >		and
|> >		b = x * sin(theta) + y * cos(theta)
|> 
|> You will lose bits if you do this, or you will get holes in the result,
|> depending on how you implement it.
|> 

This is an FAQ in comp.graphics; the recommendation there is to apply the
inverse transformation ie create the destination bitmap and for each pixel apply
the inverse rotation transform to get a pixel in the original bitmap and use that.
For more details, see comp.graphics...

|> Liam R. E. Quin,  lee@sq.com, SoftQuad Inc., Toronto, +1 (416) 963-8337

STF
-- 

sfleming@uk.ac.hw.cs or sfleming@cs.hw.ac.uk or ...ukc!cs.hw.ac.uk!sfleming
"Jedi programmers do it with byte sabres."