Re: gEDA-user: new footprint guidelines

[Armin Faltl <armin.faltl@xxxxxx>]

DJ Delorie wrote:
> [snip]
>
> All QFN parts should have some visual aids to centering :-) On my last
> board, I added four diagonal lines on the silk layer to align each
> corner (like a big X), that worked out well.
>   

During modifying library footprints, I found comments about placement lines,
requesting additional non-fabrication layers like placement and outline.
As there is currently no distinction on which layer an ElementLine[] would
be, I suggest two mechanisms to achieve this:

a) make the layername a text attribute in the flags. If no layer is 
named, "silk" is assumed.
   If there is no flag or layer of that name, again "silk" or 
autoinstantiate the layer.

b) have an optional layer attribute behind the flags

Option b) is more flexible I think. In that way, it would be quite nice 
to have some pure
drawing layers besides a layer for part outlines to make center lines, 
rulers, dimensions
and the like as in mechanical 2D cad. Actually I stumbled over this with 
placement of
potentiometers, that have to be behind a hole drilled in the cover, LEDs 
etc.


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