Getting Vertices Between two Points of a Polyline or Line in a Form of PointColl

[Anonymous]

Hi Guys

Could you Please help any one on the subjected request. As i Need to Get vertices Between Two user Selected Points in a polyline.

The Return Type I need it in the Form of Point3dCollection.

Thanks

Alex Andrews

[_gile]

Hi,

You can try the following code.

It assumes point1 and point2 are defined in WCS coordinates and the current view is Top.

For a solution working whatever the context, you can read the discussion I had with @ActivistInvestor about getting a point on curve in this post.

        private Point3dCollection GetPolylineVerticesBetweenPoints(Polyline pline, Point3d point1, Point3d point2)
        {
            double param1 = pline.GetParameterAtPoint(pline.GetClosestPointTo(point1, false));
            double param2 = pline.GetParameterAtPoint(pline.GetClosestPointTo(point2, false));
            double startParam = Math.Min(param1, param2);
            double endParam = Math.Max(param1, param2);
            int startIndex = (int)startParam;
            if (startIndex != startParam) startIndex++;
            int endIndex = (int)endParam;
            if (endIndex == endParam) endIndex++;
            var vertices = new Point3dCollection();
            for (int i = startIndex; i < endIndex; i++)
            {
                vertices.Add(pline.GetPoint3dAt(i));
            }
            return vertices;
        }

[_gile]

Oopss...

There's a mistake in the upper code.

Try this one instead.

        private Point3dCollection GetPolylineVerticesBetweenPoints(Polyline pline, Point3d point1, Point3d point2)
        {
            double param1 = pline.GetParameterAtPoint(pline.GetClosestPointTo(point1, false));
            double param2 = pline.GetParameterAtPoint(pline.GetClosestPointTo(point2, false));
            double startParam = Math.Min(param1, param2);
            double endParam = Math.Max(param1, param2);
            int startIndex = (int)startParam;
            if (startIndex != startParam) startIndex++;
            int endIndex = (int)endParam + 1;
            var vertices = new Point3dCollection();
            for (int i = startIndex; i < endIndex; i++)
            {
                vertices.Add(pline.GetPoint3dAt(i));
            }
            return vertices;
        }

[Anonymous]

Hi Gilles, Thanks for Helping me.

How ever I have few more issues, When handling with Different Geometries.

As "pline.GetPoint3dAt(i)" method is ssupportable for only Polylines; Incase of Lines, Arc, Spline, Its Can't be found... Could you Please Look into this?

Regards

Alex.

[ActivistInvestor]

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@Anonymous wrote:

Hi Gilles, Thanks for Helping me.

How ever I have few more issues, When handling with Different Geometries.

As "pline.GetPoint3dAt(i)" method is ssupportable for only Polylines; Incase of Lines, Arc, Spline, Its Can't be found... Could you Please Look into this?

Regards

Alex.

---

You didn't ask for that.

Read the subject line of your post.  It says Vertices between two Points of a Polyline or Line.

Lines, arcs, splines, and other curves aside from polylines do not have vertices, so your question makes no sense from the outset.