How to iterate through Polyline3d vertices with "for" loop?

[Anonymous]

I know I can use the following...

...
Polyline3d pl3d = acEnt as Polyline3d;
foreach (ObjectId id in pl3d)
{
    PolylineVertex3d plv3d = tr.GetObject(id, OpenMode.ForRead) as PolylineVertex3d;
    Point3d p3d = plv3d.Position;
    ...
}

But I need to work with "for" loop.

It seems "pl3d[i]" does not work.

Is there other ways to iterate through Polyline3d vertices?

[Anonymous]

Hmm....

Looks like the following will do the job.

Polyline3d pline3d = ent as Polyline3d;
for (double i = 0; i < pline3d.EndParam; i = i + 1 )
{
    Point3d p3d = pline3d.GetPointAtParameter(i);
}

 Is that correct?

[Alexander.Rivilis · Accepted solution]

using System;
using System.Linq;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;

[assembly: CommandClass(typeof(Rivilis.CurveUtils))]

namespace Rivilis
{
  public class CurveUtils
  {
    [CommandMethod("ListPoly3D", CommandFlags.Modal)]
    public static void ListPoly3D()
    {
      Document doc = Application.DocumentManager.MdiActiveDocument;
      Editor ed = doc.Editor;
      PromptEntityOptions prCurv = new PromptEntityOptions("\nSelect Polyline3d: ");
      prCurv.SetRejectMessage("not a Polyline3d");
      prCurv.AddAllowedClass(typeof(Polyline3d), false);
      PromptEntityResult resCurv = ed.GetEntity(prCurv);
      if (resCurv.Status != PromptStatus.OK) return;

      using (Transaction tr = doc.TransactionManager.StartTransaction()) {
        Polyline3d pl3d = tr.GetObject(resCurv.ObjectId, OpenMode.ForRead) as Polyline3d;
        ObjectId[] verts = pl3d.Cast<ObjectId>().ToArray();
        ed.WriteMessage("\nNumber of vertexes: {0}", verts.Length);
        for (int i = 0; i < verts.Length; i++) {
          PolylineVertex3d vt = tr.GetObject(verts[i], OpenMode.ForRead) as PolylineVertex3d;
          if (vt != null) {
            ed.WriteMessage("\n[{0}] = {1}", i, vt.Position.ToString());
          }
        }
        tr.Commit();
      }
    }
  }
}

[Alexander.Rivilis]

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@Anonymous wrote:
Is that correct?

---

It is look like you skip last vertex...