FS#2415 - Issues with OffsetBothSides
Andrew,
I can’t find any documentation concerning OffsetBothSides under Misc .. Modify.
It is not listed in the QCAD features nor in the changelog.
There was a Feature Request FS#1130 for this, I think you might want to close that as being implemented.
The tool asks for a Line, Arc, Circle, Ellipse, Spline or Polyline.
It also seems to act on shapes that can be exploded to such entities like Text, Dimension and Hatch entities.
There may be many ‘Result loop not closed’ or ‘No offsets possible’ warnings when hovering over entities on a drawing.
The preview may be partially, one or two sided and even two sided partially and closed with semi-circles.
I only successfully created a dual offset for open Splines, open or logically open Polylines.
All other attempts result in a single offset at the indicated side.
There are the usual exceptions for Polylines with arc-segments but that is related to small arc segments and being tangentially connected.
Only tested it on a Win7 platform.
I don’t suspect that version 3.27.8 includes a fix for that ... 
Regards,
CVH
Offset Both Sides.dxf
(123.1 KiB)
Note that tools under Misc are either undocumented, untested, experimental, untranslated or only partially implemented. Many of these scripts were used for a very particular situation and are provided in the hope they might be useful to someone.
Some of these tools might make it into a main menu eventually or they might stay there or even be removed in the future. Misc is the "hodgepodge" menu of QCAD ;)
I was only reviewing the +400 open tickets.
Knowing the tool was there I tested it.
Regards,
CVH