On Jun 7, 2007, at 10:33 AM, L.J.H. Timmerman wrote: > Hi Dave and all, > > If I remember this correct (on top of my head) the Gerber exporter > ignores 1 mil lines by: > <code> > if (gc->width == 1) > return; > </code> > > It might be possible to filter out 1 mil (or a smaller, specific > width) > lines and arcs for paste layers by ignore everything wider than 1 > mil in > a similar way in the mentioned stencil-hid. > > <code> > if (gc->width > 1) > return; > </code> > > Filtering could/should be done in in the stencil_draw_* () functions. > > The stencil_fill_* () functions should translate any outline > parameters > to arcs and lines. > > In this way those lines and arcs could be in the footprint without > breaking the new-lib footprint file format.
Shouldn't the file format be forward compatible with a warning? if an unknown parameter is introduced in the file format, pump out a warning and continue? example Pin(-388 0 110 30 140 48 "3" "3" 0x00000001) ElementLine (-388 160 -388 140 10) PadSolder( ********* ) WARNING PadSolder unknown PCB element. this wont protect earlier releases of pcb, but allows for expansion of definitions. Steve > > If you need boilerplate code for exporting of DXF entities let me > now, I > got a dxf lib for writing to files (not reading) from my DXF exporter > hid. > > Just my EUR 0.02 > > Kind regards, > > Bert Timmerman. > > > On Thu, 2007-06-07 at 09:04 -0700, Dave N6NZ wrote: >> L.J.H. Timmerman wrote: >>> Hi Dave and all, >>> >>> On Wed, 2007-06-06 at 11:24 -0700, Dave N6NZ wrote: >>> >>>> a) pcb paste layer gerber is directly from the pad layer, and I >>>> think in >>>> many cases that lays down too much solder. I haven't experimented >>>> enough to be able to say for sure. I'd like to see some paste >>>> layer >>>> control added to the footprint definition. >>>> >>> Since this is on a per thickness, per material basis for the stencil >>> involved, I think this could be better handled in a specific >>> "stencil" >>> exporter with a configurable positive(=larger) or negative(=smaller) >>> offset value for the pad-outline. >> >> That would be cool. But I also think you want to be able so specify >> different shrinks on a per-footprint/pad basis. For example, for >> those >> packages with a big heat-sink pad, that pad may want a different >> shrink >> from the rest of the pins on the package, and different from the >> default. So, I could see some kind of format like: >> >> default -10% # any footprint, any pad >> sot223.2 -30% # sot223 footprint, pin #2 gets special treatment >> >> Maybe something like that should even go into the footprint >> definition? >> (I'm thinking newlib here, I never use the M4 stuff.) >> >> But in the end, I think the pad size adjustment in pcb should >> apply to >> what is written to the paste layer gerber. Converting to pad outline >> vectors is better done in the gerber previewer or some other gerber >> reader, since that yields a more general tool suite. Of course, I >> won't >> complain if pcb directly puts out the file that I need :) >> >>> >>>> b) My current method for prepping a file for the laser cutter is >>>> a bit >>>> of a kludge. Ideally, I'd like to see the gerber previewer have >>>> the >>>> option of exporting .dxf of the pad outlines from the paste layer. >>>> >>> If the exporter can be made configurable for not doing fill >>> operations >>> on a pads in a pads-only-mode, then it's also possible to do this >>> for a >>> DXF exporter. >> >> Yes, the fill just gets in the way as far as my laser cutting s/w is >> concerned. >> >> -dave > > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
