bounding boxes in schematic

Hi All

I had been vexed by the bounding box problem with schematics for a
long time. Every once in a while, the bounding box for schematic would
be incorrect. This resulted in the fit to window not working quite
properly. (dbComputeBBox (geGetEditCellView)) didn't fix the problem.

Recently, I figured out that many (but not all) of these cases were
cause by pin labels when they are in 'textOnRight' or 'textOnLeft'
modes! If I change those pin-labels to 'textOnTop' the bounding box is
correct again.

Has any one else seen this kind of behaviour?

Regards
Satya

 

This is likely due to the concept of boundingboxes and what generates them.

Back several cadence generations ago ( say 3.2 ... ) the schematic and
layout
viewers were actually the same tool.

You could draw a rectangle on the "instance drawing" layer to override the
creation of the bBox based
simply on the extents of all data that is in the cell.
Typically text and changeLayer would cause me all sorts of grief wrt this.

YMMV