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On Thu, 2013-11-14 at 00:39 +0000, Peter Clifton wrote:

> It looks pretty sweet...
> 
> If it were possible to make use of this code as a separate library, that
> would really be awesome.
> 

The problem may be the data structures.
Of course there should be no problem for plain pins.
But for pads -- I guess their shape may be defined differently for KiCAD
and gEDA/PCB. PCB Pads can even built clusters -- multiple rectangular
or rounded overlapping pads overlapping with round pins. So we can have
really complicated shapes, not always convex. My router is also
concerned by pad shape -- it was my initial goal to clearly separate the
router algorithm from the code related to the PCB board, but I failed.
Currently code for pcb board import is mixed with code for routing -- I
know that that is not good, but I simple ignore that problem for now.
Of course we can replace each pad with a convex hull of pins -- things
may become difficulty when traces should jump over pads...

And -- I was told that KiCAD (currently) does not support copper arcs,
they build it with line segments. Maybe they have a good reason for
that?