How to find the remaining vertices on a polyline?

[zhengyunyang2019]

For example, if a polyline has two vertices, and I have applied fillet  to one of the vertices, then there is one vertex remaining.

I would like to find this remaining vertex through code.

In fact, there might be multiple filleted vertices and multiple remaining vertices, and I want to locate all the remaining vertices.

[_gile · Accepted solution]

Hi,

You can check if the bulges of two successive segments is equal to 0.0.

        private static IEnumerable<int> GetNonFilletedVerticeIndices(Polyline pline)
        {
            int n;
            if (pline.Closed)
            {
                n = pline.NumberOfVertices;
                if (pline.GetBulgeAt(0) == 0.0
                    && pline.GetBulgeAt(n - 1) == 0.0)
                {
                    yield return 0;
                }
            }
            else
            {
                n = pline.NumberOfVertices - 1;
            }
            for (int i = 1; i < n; i++)
            {
                if (pline.GetBulgeAt(i - 1) == 0.0
                    && pline.GetBulgeAt(i) == 0.0)
                    yield return i;
            }
        }

[zhengyunyang2019 · Accepted solution]

for (int i = 1; i < polyline.NumberOfVertices - 1; i++)
{
    SegmentType line1 = polyline.GetSegmentType(i - 1);
    SegmentType line2 = polyline.GetSegmentType(i);
    if (line1 == SegmentType.Line && line2 == SegmentType.Line)
    {
        Point3d p = polyline.GetPoint3dAt(i);
        ed.WriteMessage("\nThe {0} is a need point", i);
    }
}

Thank you very much for your help.

Earlier, I considered a solution myself, which involves determining whether each point is a bend point by checking if the adjacent line segments are straight.

Do you think my approach is feasible?

[_gile · Accepted solution]

---

@zhengyunyang2019 wrote:

Earlier, I considered a solution myself, which involves determining whether each point is a bend point by checking if the adjacent line segments are straight.

Do you think my approach is feasible?

---

Yes it is (simply try it), but your example does not handle closed polylines first vertex.