Topic: Offset method - docs seem incorrect RE: sign of distance

[hermanm]

Using ACAD 2008

Docs say:

Distance

Double; input-only
The distance to offset the object. The offset can be a positive or negative number, but it cannot equal zero. If the offset is negative, this is interpreted as being an offset to make a "smaller" curve (that is, for an arc it would offset to a radius that is "Distance less" than the starting curve's radius).

This code:

Code: [Select]

Command: (vlax-invoke obj 'offset 0.25)
(#<VLA-OBJECT IAcadLWPolyline 0bb73304>)

Offsets to the inside (smaller radii).

This code:

Code: [Select]

Command: (vlax-invoke obj 'offset -0.5)
(#<VLA-OBJECT IAcadLWPolyline 0bb73c64>)

Offsets to the outside (larger radii).

[CAB]

I think this may shed some light on the subject.
http://www.theswamp.org/index.php?topic=23921.0

[hermanm]

Thanks, CAB.

Confirm Gile's result:

Positive offset is to the right, negative to the left, traveling along the polyline in the direction it was drawn.