On 2007-06-10, at 11:33:16, Anders Markussen wrote:
Trying to draw a 1 point non-antialiased line. Filed a bug: --
"Works as expected". Sorry to be so forthright, but I think that's
sub-standard.
What do you mean? What is it that doesn't work as you expect? All
you need to remember are 2 rules:
CG like virtally all graphics systems use pixel boundaries for
positioning, and CGContextStrokePath/CGContextStrokeRect centers
the line on the path you specified.
So if you do CGContextMoveToPoint/CGContextAddLineToPoint with
integer values, and have an odd line width it will of course look
blurry, because you specified half the line to be drawn the pixels
on either side of the path (which, as said, runs on the pixel
boundary.
If you want the 1-pixel-wide line to not span several pixels, you
simply add 0.5, so CGContextMoveToPoint(ctx, 10.5, 4);
CGContextAddLineToPoint(ctx, 10.5, 24);
If it is diagonal lines you don't want antialiasing on, there is
always CGContextSetShouldAntialias.
I know about the 1/2 pixel trick. It's a design bug that we have to
do stuff like that in the first place.
Philip Aker
email@hidden
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