Re: invertrect, any cocoa versions suggested?
Re: invertrect, any cocoa versions suggested?
- Subject: Re: invertrect, any cocoa versions suggested?
- From: John Stiles <email@hidden>
- Date: Tue, 24 Jan 2006 07:47:30 -0800
Camillo Lugaresi wrote:
On 24/gen/06, at 06:15, John Stiles wrote:
The problem here is that Core Graphics doesn't really work in terms
of "pixels" per se. It's built around resolution-independent vector
graphics concepts. For example, you can apply a transformation matrix
to the view which will skew, rotate or scale it. So conceptually,
there really aren't any "pixels" for you to get at, unfortunately.
I don't think CG offers an "invert" fill mode either, unfortunately.
I can't see any conceptual reason why not. My only hunch is maybe
that "invert" doesn't seem very useful in a PostScript world, and
CoreGraphics is descended from Display PostScript.
Actually, using kCGBlendModeDifference with a fully-white source image
should invert the colors of the background image (1.0 - c).
Sweet, I looked around but didn't see that one. Does that mean the OP
/can/ draw inverted rects with CG?
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