NSBezierPath clockwise?
NSBezierPath clockwise?
- Subject: NSBezierPath clockwise?
- From: Lorenzo <email@hidden>
- Date: Sat, 15 Oct 2005 13:52:53 +0200
Hi,
I have to detect whether a bezier path describing a polygon, is clockwise or
anti-clockwise. For closed filled shapes non concave, as a circle, is pretty
easy. I get the center of the shape, then I check the first 2 points of the
path. If they create a positive angle with the center, well, it's
anti-clockwise.
For closed filled shapes with some concavity/convexity, (think about the
character "C" with a bold style) it's not so easy. The first point of the
path could be in the interior area of the C, and go anti-clockwise. But if
you follow that path, once you go on the top of the C you discover it is
clockWise. I suppose I have to detect the direction looking at the filled
area. My raugh idea is:
a) I get a direction comparing 3 points of the curve. e.g. It's clowise.
b) Then if at the right of each point I don't find the filled area of
the polygon, I have to invert the direction thus it's anti-clockwise.
Could this method work in any case?
Any suggestion?
Best Regards
--
Lorenzo
email: email@hidden
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