Re: Pixel-aligned autoresizing

[Jens Ayton]

On Jul 6, 2011, at 10:32, Fred Kiefer wrote:
> 
> Basically wee need to ensure that all drawing operations that are
> initiated by the gui drawing code get pixel aligned. Somebody will have
> to test whether this is true for all drawing operations, that is, when I
> use an NSBezierPath with fractional coordinates to draw into a NSView,
> will the result be blurred?

Yes, Cocoa NSBezierPath supports subpixel positioning. In fact, the most common 
question from beginners is why one-pixel rectangles at integer coordinates are 
drawn two pixels wide, and this is the answer.

Developers writing custom views are expected to use -centerScanRect: and 
related coordinate transform functions to ensure grid-aligned drawing under 
transformation and UI scaling, and I assume the standard views do too.


-- 
Jens Ayton