Adding a Vertex to a closed Polyline

[vinayan]

I have a method for inserting a vertex to a polyline. But this does not work for closed polylines for the case shown below. The code fails if the point is on the last edge of the polyline. Can someone look into it?

public void AddVertexOnPolyline(Point3d addPoint,Polyline editPolyline)
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Core.Application.DocumentManager.MdiActiveDocument;
            Editor pEditor = acDoc.Editor;
            int chk = 1;
            try
            {
                for (int i = 0; (i <= (editPolyline.NumberOfVertices - 1)); i++)
                {
                    double dist1 = editPolyline.GetDistAtPoint(addPoint);
                    double dist2 = editPolyline.GetDistAtPoint(editPolyline.GetPoint3dAt(i));

                    if ((editPolyline.GetDistAtPoint(addPoint) < (editPolyline.GetDistAtPoint(editPolyline.GetPoint3dAt(i)))) && chk != 0)
                    {
                        Point2d pnt2 = new Point2d(addPoint.X, addPoint.Y);
                        editPolyline.AddVertexAt(i, pnt2, 0, 0, 0);
                        chk = 0;
                        break;
                    }
                }
            }
            catch (System.Exception ex)
            {
                throw;
            }
        }

[Jeff_M · Accepted solution]

This works for me. Note that I chose a slightly different method of obtaining the index to add it to.

        public void AddVertexOnPolyline(Point3d addPoint, Polyline editPolyline)
        {
            try
            {
                Point3d ptOnPline = editPolyline.GetClosestPointTo(addPoint, false);
                double parm = editPolyline.GetParameterAtPoint(ptOnPline);
                Point2d pnt2 = new Point2d(addPoint.X, addPoint.Y);
                editPolyline.AddVertexAt((int)System.Math.Floor(parm) + 1, pnt2, 0, 0, 0);
            }
            catch (System.Exception ex)
            {
                throw;
            }
        }

[vinayan]

Jeff,

That worked out fine!

thanks a lot