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Re: How to draw a 1-pixel non Antialiased line
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Re: How to draw a 1-pixel non Antialiased line


  • Subject: Re: How to draw a 1-pixel non Antialiased line
  • From: Paul Fox <email@hidden>
  • Date: Sun, 6 Oct 2002 08:56:36 +0100

> On Saturday, October 5, 2002, at 04:00 PM, Paul Fox wrote:
>
> > Update on this long standing issue -- how to draw a 1-pixel wide
> > diagonal line.
> >
> > The Answer is simply to use the QuickDraw routines. I have tried
> > everything possible within Cocoa/NSBezierPath to no avail. I can
> > draw 1 pixel wide lines using the tricks suggested by various people
> > on this list if the line is horizontal or vertical, but none of them
> > work for diagonals.
> >
>
> Just turn off Antialiasing.

Afraid not - at least not in 10.1. I tried that. It stops the line
being smudged but is at least two pixels wide. I tried using
the +0.5 trick to the co-ords and similar results.

If you have code that does it, then I would be happy to learn the
error of my ways, but certainly antialiasing isnt it.

I havent tried image interpolation - could possibly be that, and I will
give it a try.

thanx

> @interface NSGraphicsContext(NSGraphicsContext_RenderingOptions)
>
> - (void)setShouldAntialias:(BOOL)antialias;
> - (BOOL)shouldAntialias;
> - (void)setImageInterpolation:(NSImageInterpolation)interpolation;
> - (NSImageInterpolation)imageInterpolation;
>
> #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_2
>
> - (void)setPatternPhase:(NSPoint)phase;
> - (NSPoint)patternPhase;
>
> #endif
>
>
> > But using QuickDraw (NSQuickDrawView), I can do it.
> >
> > I raise the issue in case anyone wants to add to this - as I would
> > prefer a native-Cocoa solution, but in this instance, I had to do
> > something about it - they just looked so awful being double width.
> >
> > thanks all
> > _______________________________________________
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