* Diab Jerius via RT (bug-Math-Polygon@rt.cpan.org) [080407 20:49]:
Show quoted text> Mon Apr 07 16:49:20 2008: Request 34746 was acted upon.
> Transaction: Ticket created by DJERIUS
> Queue: Math-Polygon
> Subject: Vertex attributes
> Ticket <URL:
http://rt.cpan.org/Ticket/Display.html?id=34746 >
>
> It would be nice to be able to attach attributes to a vertex for later
> retrieval. For example, I have a set of independent vectors each of
> which is parameterized as a triple {base coordinate, angle, length}.
> I'd like to order the vectors by their base coordinates (using the
> Math::Polygon::clockwise() method), but need to retain the relationship
> between the coordinates and their associated angles and lengths.
The points in Math::Polygon are arrays of two elements, for performance
reasons. What you suggest is to change them into either arrays of
more elements, or arrays of HASHes. For a generally application
implementation, you need a HASH per point. This would mean that all
functions need to be rewritten... not something I would like to do.
Besides, if you add attibutes, then some functions will need to change
those as well. F.i. when a counter-clockwise poly is changed into
a clockwise poly, then the angle attribute has to be changed. I think
it is impossible to define a complete set of attributes, such that
everyone has sufficient data... and still be fast.
So... I think there is not justification to extend points into being
more than an ARRAY of two coordinates. However, feel invited to
extend Math::Polygon with an Math::Polygon::Vertex which extends
the ARRAY with a few more (for your application useful) attributes.
With some luck, you may not need to reimplement each of the existing
methods. It would be nice to share the interface.
--
Regards,
MarkOv
------------------------------------------------------------------------
Mark Overmeer MSc MARKOV Solutions
Mark@Overmeer.net solutions@overmeer.net
http://Mark.Overmeer.net http://solutions.overmeer.net
