Re: drawing 1 pixel wide lines
Re: drawing 1 pixel wide lines
- Subject: Re: drawing 1 pixel wide lines
- From: "Clark S. Cox III" <email@hidden>
- Date: Wed, 07 Aug 2002 15:54:17 -0400
On 08/07/2002 15:13, "Albert Russel" <email@hidden> wrote:
>
How do you draw 1 pixel wide completely black vertical lines?
>
>
[NSBezierPath setLineWidth: 0.0];
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[NSBezierPath setDefaultFlatness: 1.0];
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[NSBezierPath setLineCapStyle: NSButtLineCapStyle];
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[[NSColor blackColor] set];
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[NSBezierPath strokeLineFromPoint: p1 toPoint: p2];
>
>
The above gives vertical lines that are more than 1 pixel wide, I believe to
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see 2, and the lines are a little transparent. I select the color black but
>
the lines are gray. When I draw 2 lines at the same position it gets black.
Positions in Quartz refer to the grid *between* the pixels, so if you
stroke a line that lies completely on integer boundaries, it will actually
spill over in to two pixels, but with half the alpha. If you want to draw in
the pixels themselves (which it appears you do) offset your coordinates by
(0.5, 0.5)
--
Clark S. Cox III
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