hit detection with NSBezierPath
hit detection with NSBezierPath
- Subject: hit detection with NSBezierPath
- From: "Michael B. Johnson" <email@hidden>
- Date: Thu, 01 Aug 2002 10:03:33 -0700
so I have a view that lets the viewer draw in, and I draw by building
up NSBezierPaths with line segments of varying width (based on
pressure). I now want to let the user drag a color on top of that path
to change the color of the line after the fact. If my line is skinny,
using NSBezierPath's containsPoint: works fine, but as the line
thickness goes up, I realize that containsPoint: is more literal than I
would like - it only has to do with the center line of the path; not
the actual coverage of the path. In other words, if I have a line that
goes from 0,0 to 10,10 with a thickness of 10, the point 1,2 is *not*
considered to be on the path, while visually it most certainly is.
There are obviously several different ways I could go about solving
this, but they're all more expensive than I'd like, and I'm certainly
convinced that (a) this is the AppKit's job and (b) my way I come up
with in a day is not the ultimate smart/fast way to do it.
So is there something I'm missing here, or should I be filing a feature
request, or...?
constructive suggestions appreciated.
--> Michael B. Johnson, Ph.D. -- email@hidden
--> Studio Tools, Pixar Animation Studios
-->
http://xenia.media.mit.edu/~wave
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