How to set Polyline.StartPoint ?

[Anonymous]

I tried to set Polyline.StartPoint to new position (Point3d):

Polyline.StartPoint = myNewPoint3d;

I have "not implemented" exception.

Also, I tried to do it as:

var seg0 = acEnt.GetLineSegmentAt(0);

seg0.Set(newPoint3d(0, 0, 0), seg0.EndPoint);

It doesn't work also.

I can do it as:

acEnt.SetPointAt(0, my2dPoint);

But it's 2D point, not 3d

Of course I can remove polyline and create it again, but...

How to set start point correctly for 3d point?

Pavel

[Hallex · Accepted solution]

Here is a quick and dirty snip you will be use as framework,

change to your suit

   [CommandMethod("SPT")]  
        public void chageStartPoint()
        {
                PromptEntityOptions peo = new PromptEntityOptions("\nSelect a segment where to add a vertex: ");
            peo.SetRejectMessage("\nIncorrect entity"); 
            peo.AllowNone = false; 
            peo.AllowObjectOnLockedLayer = false;
            peo.AddAllowedClass(typeof(Polyline), true);
            PromptEntityResult per = ed.GetEntity(peo); 
            if (per.Status == PromptStatus.OK) 
            {
 
                ObjectId id = per.ObjectId; 
                try 
                { 
                    using (Transaction tr = db.TransactionManager.StartTransaction())
                    { 
                        Polyline pline = tr.GetObject(id, OpenMode.ForRead, false) as Polyline; 
                        if (pline != null)
                        {
                            pline.UpgradeOpen();
                            Point3d pt = ed.GetPoint("\nPick new start point location: ").Value;
                            Point2d sp = pt.Convert2d(new Plane(Point3d.Origin, pline.Normal));
                            pline.AddVertexAt(0, sp, 0, pline.ConstantWidth, pline.ConstantWidth);
                            pline.RemoveVertexAt(1);

                        }
                        tr.Commit();
                    }
                }
                catch (System.Exception ex)
                {
                
                    ed.WriteMessage( ex.Message);
                }
            }
        } 

~'J'~

[Anonymous]

Thanks a lot! I think it will work for me.

Pavel.

[Hallex]

You need to extend this code

Add in there the part to work with different

coordinate system etc

You're welcome

~'J'~