detect and optional remove dangling/floating schematic lines?

Hi Dan,

Maybe iterate over wire segments to identify those that are over a symbol but not over a pin?  Use dbGetOverlaps() or similar to look under both ends of the wire segment, if neither is over a pin shape (and perhaps checking that at least one point is inside an instance selection box, maybe even specifically resistors) then this could be a wire segment that you are looking for [I can imagine some cases where a wire performs a bend right next to the resistor before connecting to the pin and thus being flagged, but better to find false positives than miss some wires].

Hope this helps,

Lawrence.

Thanks for the suggestion.  I was able to get something more or less working.  The couple of tricks were:

keep_wire = nil

foreach(pt fig->points

  ;;you can use a single point "bounding box"

  ;;restrict to wire/drawing lpp and top cv to get wires:

  r = dbGetOverlaps(cv list(pt pt) list("wire" "drawing") 0)

  ;; restrict to lines and paths

  r =  setof(X r member(X~>objType list("line" "path")))

  when(length(r) > 1 keep_wire = t) ;; we have a wire or path on this end

  ;; now look for connections to a symbol pin (1 == look this level and 1 down)

  r = dbGetOverlaps(cv list(pt pt) list("pin" "drawing") 1 ) 

  when(length(r) > 0 keep_wire = t) ;; we have a pin connection

)

unless(keep_wire dbDeleteObject(fig))

feels like a real hack and it will miss things like a wire that has a jog in it but is otherwise not connected.  But still, better than nothing.

On a different note, what is the magic in this forum to paste code in a more code-like format?

Hi Dan,

I use the full editor (which, of course, has just changed) and edit the HTML/source to change the 'p' tags to 'pre' tags and then further surround the SKILL with 'code' tags - each of 'pre' and 'code' need a start and end tag, but this seems to allow the code to stand out and read a little better.  I think Andrew uses a filter to add coloring to his code (I sometimes add bits by hand to color comments and so on).

Best regards,

Lawrence.

Hi,

Why not look for net names which do not connect to any instance?

-Ramakrishnan

I have a CGI script to format my code library - it uses this under the hood (in essence):

enscript --color --language=html -Eskill --output=- code.il > code.html

If you then display code.html in a web browser, you can copy and paste the formatted code into the forum.

That said, I do remember having to ensure I use an older version of enscript (1.6.1) because some of the italics were a bit odd in 1.6.4 (I can't quite remember though - this was going back a few years).

Regards,

Andrew.

Sorry - I was wrong. I use enscript v1.6.5.1 because it fixed the earlier bugs in v1.6.4. I was looking at an old internal email when I was trying to use an older version with the scheme language mode; I later switched to the skill highlight mode.

Andrew

The basic situation that started this was changing from some 3-terminal resistor symbols where the 3rd terminal typically had a little stub of  wire labeled as VDD or VSS.  After switching to a 2-terminal symbol, that stub was not needed but of course VDD and VSS still went to instances in other parts of the schematic so deleting by net name wasn't effective.

-Dan