First of all thanks Jens for taking the time to reply and educate me. On 2012-05-05, at 12:40 PM, Jens Alfke wrote: > On May 5, 2012, at 7:41 AM, Peter Teeson wrote: >> But I did not realize that the bounds stroke was straddling the view content >> edges. >> How did you learn that? > > If you think about it, drawing a stroke along a path _has_ to draw on both > sides of the path > (i.e. centered on the path) because there isn’t necessarily any inside or > outside; > the path might not be closed, or it might be a figure 8 or something. Good points Jens. I never gave a thought to look up -stroke in the NSBezierPath reference.
> Another side effect of this is that, if the path width is an odd number of > pixels, > you should offset your coordinates by 0.5 to make sure you completely fill > pixels, > otherwise you’ll have fuzzy borders on your horizontal and vertical strokes. > > —Jens As to odd number of pixels I was under the impression that the parameters are in points, which are a unit of length* whereas pixels are related to hardware specs. e.g. Line width is in points. So it is not the responsibility of the device driver to map points to pixels in a device dependent way? I wish to write resolution independent code which to me implies I should use points. Are you saying that I have to compute the path width in pixels? And then adjust for valence? etc? If so I have been harbouring an illusion that I'm responsible for points and the drivers are responsible for mapping to the hardware. If I am wrong then doesn't this place an undue burden on the programmers. Have I got it wrong? But anyway thanks for taking the time. respect…. Peter *[Point is a physical unit of length, used in typography. It's equal to 1/12 Pica, and 1 Pica = 1/6 inch. So 1 pt = 1/72 inch] _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
