What function is drawing? I'm not sure this works with NSFrameRectWithWidth(), but it definitely does with NSBezierPath/ stroke.
The NSFrameRect family of routines are odd ducks to begin with. In some ways, they tend to to be more pixel oriented than your typical drawing routines. For example, if you use NSFrameRectWithWidth, and supply a width of 1 (or 0) then you will see that your framed rectangle does not have to have the 0.5 pixel offset in order to align to the pixel grid. You will also note that when using wider widths, the stroke does not straddle the rectangle's path the way it would when using NSBezierPath. The entire width of the stroke (in pixels) will be contained within the rectangle. Finally, the pixel-oriented nature of these routines is clear when you consider that there is NSFrameRectWithWidthUsingOperation which draws the frame while applying a pixel operation.
In a lot of ways, using NSFrameRect and friends is more like copying a bitmap onto the screen rather than drawing with the underlying Quartz mechanisms.
As a result, the NSFrameRect routines are very handy for drawing on- screen or to bitmap contexts, but may, or may not, give you suitable results when drawing to other devices.
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