How to check if a ployline is in another polyline?

[Anonymous]

Please advise me:

I want to check, if a polyline is enclosed in another polyline or not?

I want to dimension the outer most closed polyline.

P.S. all polylines are closed.

[3wood]

You can create 2 REGIONs from 2 closed polylines.

The use SUBTRACT to minus the Large Region from the Small Region.

If there is nothing left, it means the small polyline is inside the larger polyline.

[Anonymous]

through VBA, I’m getting x & y’s of only one polyline at a time which I want to check if it is enclosed inside another polyline or not.

 I haven’t any other thing from which I can compare two different/similar polylines.

[3wood]

Method of checking if all vertex are inside another polyline only valid in Convex Polygons.

It doesn't work in Concave Polygons. See scenario below.

[Anonymous]

My scenario is simpler than that. All vertices of smaller/enclosed polylines will always be inside the bigger/outer polyline.
But same questions again, How to find, if polyline is inside or it is the outer-one?

[3wood]

Second approach is using the polyline vertex of Polyline A to make a WP selection. If Polyline B is in the selection, then Polyline B is inside Polyline A. 

[Anonymous]

I am exactly using this (Second Option), Now the problem I am facing is that when Polyline is empty inside, my code fails there. Assume a Square/Rectangle and nothing inside, just one polyline.

[Anonymous]

I think you are right, I need to work through regions, Need to convert each entity into regions and then check if they are intersecting?
Probably that's the way.

[MakCADD]

draw a ray from the vertex of inner polyline

if the number of intersection is an odd number 

then it is inside the polyline.

and the two polylines intersect each other then it not inside the polyline