Move a polyline parallel to other polylines

[mdolanVQYAA]

I am looking for the best method of moving the red polyline to be completely between the R/W and BOC polylines. Two feet from the R/W to be exact.  I have the R/W polylines green and cyan just to show that there are two of them along the length of the red line.  There could be multiple of the BOC too.

I can find both the closest point on a BOC and RW polylines to any given point on the red line. I can then figure out if it is inside or not. I can figure out where it intersects and stick a new vertex in the red line to keep it inside. That gets it inside but it still looks bad.

Ideally what I am looking for is a way to make the red line have all the vertices of the R/W polylines it runs along.  Ideally the red line would end up looking like this.

Thank you.  Any guidance or examples are greatly appreciated.

[_gile · Accepted solution]

Hi,

You should have a look at the Curve.GetOffsetCurves method.

You can also use or get inspiration from the Polyline.Offset extension method from Gile.AutoCAD.Extension library.

[mdolanVQYAA]

That got me pointed in the right direction. Nice extension library BTW.