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Re: gEDA-user: Visual cue of zero length pin endpoint

   How about an external filter utility that could remove (with
   appropriate message) the offending line segments.
   George
   On 01/23/2011 10:01 AM, Peter Clifton wrote:

On Sun, 2011-01-23 at 23:52 +0900, Andrzej wrote:

Krzysztof,


I'd like to get opinions on the drawing of visual cues (endpoints) of
pins. Curently:

This may not be a suggestion you expected, but... how about making the
parser stricter and actually remove such shapes (and any other
zero-sized objects) before they make their way into libgeda? These
shapes violate the gEDA file format spec so if the tool is being
sloppy about checking their properties, we will end up with 2 specs -
one "official" and one "de facto" (particularly important for authors
of third-party tools, as they will have to reproduce all the
workarounds in libgeda).

libgeda was recently patched to allow zero length pins. Please point me
at where the documentation says this is invalid, and I'll file a bug
about getting that changed.


Visual artifacts in rendered symbols are not the only problem. There
might also be other functions that depend on directionality of pins. I
vaguely recall that the pin direction is used by gschem for assisted
routing of nets in schematics (as a preferred direction of a net
connected to the pin).

You are correct there, those driving the zero-length pins change should
consider whether this is a problem or not, and if so - what do do about
it!

On cursory inspection, adding preferred net orientation could require a
file-format bump to do flexibly. A heuristic could be imagined, but it
won't be as easy to get right as it first sounds.






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