Re: [artworks] A funny point in intersections
- From: Martin Wuerthner <lists@xxxxxxxxxxxxxxx>
- To: artworks@xxxxxxxxxxxxx
- Date: Tue, 22 Feb 2011 21:19:13 +0100
In message <mpro.lh0q170001fc40p8e.tim@xxxxxxxxx>
Tim Powys-Lybbe <tim@xxxxxxxxx> wrote:
> Time for something on ArtWorks.
> I think I have at least got the hang of intersections and am delighted
> with this facility for making it easy to do complicated drawings.
> However there is an odd extra point that keeps on creeping in.
> [...]
> The odd thing is the additional point of the Intersection on its curved
> section. There is no such point on the curvature of the original
> shield. The two curved parts of the shield are simple beziers. This
> additional point can be a slight nuisance when trying to make minor
> subsequent alterations to the intersected object. But if the point is
> deleted that segment reverts to a straight line.
> Does this additional point have to be there?
It does not have to be there but this is how the intersection
algorithm in ArtWorks works. Curves that are not cut through by the
clipping path remain untouched, only intersected curves are modified
to end in the intersection point, but in addition to that they usually
get another anchor point near the intersection. There is no easy way
to prevent this from happening.
Xara Xtreme did exactly the same for a long time. Version 3.2 still
behaved as ArtWorks and added these extra points (not surprising since
the intersection routines were written by Gavin who also wrote those
used in ArtWorks). Xtreme 4.0 was the first version that used an
improved intersection algorithm producing the optimal result without
any extra points.
Martin
--
---------------------------------------------------------------------
Martin Wuerthner MW Software lists@xxxxxxxxxxxxxxx
---------------------------------------------------------------------
------------------------------------------------------------
To change, suspend or cancel your subscription go to
//www.freelists.org/list/artworks
------------------------------------------------------------
Other related posts:
