On Wed, Feb 10, 2010 at 6:03 AM, Peter Clifton <[email protected]> wrote: > On Wed, 2010-02-10 at 11:43 +0000, Peter Clifton wrote: >> >> The fact I don't see complaining - either means that I'm not taking >> the >> required steps to reproduce (ie.. what is subtracting from the polygon >> if your lines are on a different layer?) > > Ok - read your bug report properly this time - and got answers to most > of my questions. > > The following remain though.. what are the arcs and lines left on the > component layer for? Just to show the outline?
yup > > How have you constructed a polygon which has a hole in it (Or is it not > meant to have a big hole?) it's actually a "C" shape that comes around and touches itself. > > PCB does not support defining a single ground-plane polygon with a hole > in it. It can subtract holes out of one, but it does not support you > defining its shape as anything other than a hole-less outline. can I subtract arbitrary holes out of it? how? > > If you have basically created a "C" shape, where the two ends of the C > touch infintesimally, that "ought" to work, but if becomes very easy for > numerical errors to get parts of the polygon self-intersecting. > > Could you elaborate how the polygon was constructed - obviously its too > complex to have drawn by hand. I can imagine either a computer program, > or using arcs + lines to clear away copper, then using the > "MorphPolygons" action. > I wrote a python script which looks at lines and arcs and makes the poly. I don't have time to play with it now. I put the script with inputs and a Makefile describing the process at http://vivara.net/software/line_arc_to_poly.tar.gz > As you might imagine though, scanning lists of coordinates in the PCB > file isn't particularly easy to do - and I don't have any debugging > tools to help show the order in which a polygon contour is created. Agree. Regards, Mark markra...@gmail -- Mark Rages, Engineer Midwest Telecine LLC [email protected] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
