Re: Remove overlap on NSBezierPath
Re: Remove overlap on NSBezierPath
- Subject: Re: Remove overlap on NSBezierPath
- From: Greg Titus <email@hidden>
- Date: Mon, 14 Jul 2008 11:59:32 -0700
Thanks!
- Greg
On Jul 14, 2008, at 4:24 AM, Graham Cox wrote:
On 14 Jul 2008, at 7:48 pm, Georg Seifert wrote:
Hello,
Thanks for you replies.
To clarify: I need it in a small drawing app, where you can draw
shapes and then you should be able to combine them. There is no
outline but the winding is quite important (there may be
overlapping, clipping and self intersecting parts).
If you don't need to draw the stroke, things maybe much easier (you
could keep a list of contributing paths as part of some object of
your own device for example).
I did found DrawKit but as I need to keep the curves, this doesn’t
seem to be an option.
Right now I use GPC and (optional) curve fitting. It keeps the
curves in terms of their appearance but can greatly alter the number
and location of the control points. I don't like it much either -
one reason I'd love there to be a great solution built-in.
Unfortunately I'm no mathematician and so I haven't been able to
come up with a great way to do it from first principles, nor found
any suitable code out there until...
I just had a short look at the Omni-OAExtensions. There are some
functions to find intersections of paths, so I have to build my own
merging routine out of it, right?
...this. I hadn't seen those before either. It looks as if they've
given away the hardest part, finding the intersections and crossing
directions of each intersection. On top of that you can build the
set operations. I plan to have a very good look at doing this for DK
as soon as I can - if it can be made to work it will be a much
better solution than curve fitting. Props to the Omni guys for being
prepared to give away this code like this :)
cheers, Graham_______________________________________________
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