Re: CGShading
Re: CGShading
- Subject: Re: CGShading
- From: "R. Scott Thompson" <email@hidden>
- Date: Tue, 12 Oct 2004 16:31:32 -0500
That's why I said "(at least not easily)" :-) You might try using
four radial shadings, one centered at each of the four corners and
set them up to fade to 0 by the time you get to the opposite corner.
That would get something close, but not the same, as the barycentric
shading.
You can't really use axial shadings because an axial shading can only
vary in one direction (i.e. you could get it to fade in the x
direction, but for the barycentric effect, you also want it to fade
in y and you can't do both with CGShading).
Sure you can. You just draw it along a 45-degree vector. See David
Hill's example at:
http://developer.apple.com/samplecode/Cocoa_CG_shading_demo/
Cocoa_CG_shading_demo.html
CGShading wouldn't be very useful if it could only be drawn along the
X or Y axis.
No... You misunderstand. I know that you can rotate an axial shading
any way you like. But once you've chosen a direction for the color
change, the color is constant at each point along any given line that
is perpendicular to that direction.
In contrast, to reproduce the barycentric shading, you would want to
change the alpha of current color both in the direction of the
gradient, and along the line perpendicular to the angle of the
gradient. You can't do both at the same time with CGShading.
Scott
--
Macintosh Software Engineering Consulting Services
Visit my resume at <
http://homepage.mac.com/easco/RSTResume.html>
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