Re: gEDA-user: modify footprint and update layout

[DJ Delorie <dj@xxxxxxxxxxx>]

> So a string comparison of the old string against the searched for
> string should work.

What string?  There are three strings stored in elements - value,
refdes, and description.  None are supposed to *always* include the
filename!  gsch2pcb happens to use "description" to store the
footprint name, but that's not something pcb enforces.

> Can we align the old land pattern in terms of x-y translation and
> rotation? I think this is also do-able. It does assume you have a copy
> of the old land pattern.

The assumptions are:

1. The description field is the footprint name.

2a. The locations of at least two pins don't change.
-or-
2b. The location of the mark and at least one pin doesn't change.

Be careful about swapping the endpoints of SMT pads, though.
Midpoints of SMT pads might be a better choice, but then again, that
prevents you from making the pads longer on one side (think extending
QFP pads outward).

> What if, a exchanging a land patterns because we got the pin order
> wrong. I think just do it (perhaps an option to let the user choose
> between an assumption of device centering or of a designated pad as
> the center) and then let the drc tell us our nets are shorted.

user-chosen pins might make sense.  Default could be pins 1 and 2, or
mark and 1 (mark and 2 if mark overlaps 1).


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