backingAlignedRect: doesn't align in magnified views
backingAlignedRect: doesn't align in magnified views
- Subject: backingAlignedRect: doesn't align in magnified views
- From: Leonardo <email@hidden>
- Date: Fri, 03 May 2013 19:52:40 +0200
- Thread-topic: backingAlignedRect: doesn't align in magnified views
I have subclassed a NSView and placed it within a window.
In this NSView I have to align my NSBezier rect to the pixel grid and stroke
a perfect and aligned 1 pixel width rect.
So, in the documentView's drawRect: method, I do
[[NSGraphicsContext currentContext] setShouldAntialias:NO];
[NSBezierPath setDefaultLineWidth:0.0];
NSRect anyRect = NSMakeRect(50, 113.25, 110, 70.5);
NSRect alignedRect = [self backingAlignedRect:anyRect
options:NSAlignAllEdgesInward];
[NSBezierPath strokeRect:alignedRect];
It works when the clipView's is not magnified (scale 1:1), but if I magnify
the view calling
[self scaleUnitSquareToSize:NSMakeSize(scaleFactor, scaleFactor)];
from within the magnifyWithEvent: method, I get, sometimes, a 2 width pixels
line (wrong!). Is it a bug or do I miss something? For instance, when the
view's mScaleFactor is 5.057041 (frame.size / bounds.size), I get a 2 pixels
width line (wrong), and I get this log
mScaleFactor 5.057041;
anyRect 50.000000, 113.250000, 110.000000, 70.500000
alignedRect 50.063373, 113.390257, 109.747964, 70.199148
My screen is not retina. My screen's DPI is 133.
Any solution will be welcome.
Regards
-- Leonardo
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