Order of arc vertices

[eriksorngard]

When exploding a polyline into lines and arcs, the order of the vertices returned by the Arc.PolygonalVertexes method is often reversed compared with what I expect, making it difficult to merge the vertices for each segment into a single combined polyline.

The two parallel polylines below contains three curves each, and one of them is reversed. How can I prevent or compensate for this?

[DomCR]

Hi @eriksorngard,

Exploding arcs individually it doesn't give any clue of which vertice should go first, try this extension method:

public static IEnumerable<T> GetPoints<T>(this IPolyline polyline, int precision)

It should return a list of points in drawing order.

Let me know if this helps.

[eriksorngard]

Thank you for pointing to GetPoints.

This works as expected, but the reason for exploding the polyline, was to be able to calculate the number of vertices required for keeping the tolerances for each arc within a chosen value (sagitta). The solution for now is to temporarily explode the polyline, calculate number of required vertices for each arc, and use the maximum value as the parameter for GetPoints.