I am new to AutoCAD plugin programming and C#. I’m trying to place points along a polyline in C# for a function I am writing, and I need to know when the point is being placed, is it on a curved portion, and what is the angle between the tangent lines on either end of the curved portion. A single polyline might have multiple curves, but will always have tangents between them.

AutoCad lisp: select block, copy value from block’s attribute (in my case) “VISINA”, select another block and paste into block’s attribute (in my case) “RELATIVNA”.