Topic: Emulating AutoCAD's DIVIDE command

[jlatimer11]

Hello all.

I've done a search all over and can't find the solution for something that is probably very simple, but I can't wrap my head around it.

I am simply looking to take a line and divide it and get point3d list of each division, much akin to the nodes being placed on a line when the regular divide command is run.

Any suggestions?

[n.yuan]

Assume your target for dividing is entity of Curve type (line, polyline, arc, circle). So, you know the curve's length. You divide the length by the number of segement, you get distance (along the curve) of each segment. Then you call

Curve.GetPointAtDist(double distance)

to get a Point3d along the curve.

Once you get all the points (Point3d), then it is up to you to actually emulate the Divide command (draw DBPoint at each point, or draw something like block at the points), or do something with the group of Point3ds.

[jlatimer11]

Assume your target for dividing is entity of Curve type (line, polyline, arc, circle). So, you know the curve's length. You divide the length by the number of segement, you get distance (along the curve) of each segment. Then you call

Curve.GetPointAtDist(double distance)

to get a Point3d along the curve.

Once you get all the points (Point3d), then it is up to you to actually emulate the Divide command (draw DBPoint at each point, or draw something like block at the points), or do something with the group of Point3ds.

Works perfectly. Thanks!

[zoltan]

Another way to do this could be to get a Curve3d by calling Curve.GetGeCurve() and then use the Curve3d.GetSamplePoints(int).  This will return an array of PointOnCurve3d.

[fixo]

My 2 cents
 

Code: [Select]

      [CommandMethod("die")]

        public void divideTestCommand()
        {
            Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            Editor ed = doc.Editor;
            Database db = doc.Database;
            Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("pdmode", 96);
            Autodesk.AutoCAD.ApplicationServices.Application.SetSystemVariable("pdsize", 2);
            Transaction tr = doc.TransactionManager.StartOpenCloseTransaction();
            try
            {
                using (tr)
                {
                    Curve pline = null;

                    PromptEntityOptions peo = new PromptEntityOptions("\nSelect an Curve >>");
                    peo.SetRejectMessage("\nSelect Curve only >>");
                    peo.AddAllowedClass(typeof(Curve), false);
                    PromptEntityResult res;
                    res = ed.GetEntity(peo);
                    if (res.Status != PromptStatus.OK)
                        return;
                    Entity ent = (Entity)tr.GetObject(res.ObjectId, OpenMode.ForRead);
                    if (ent == null)
                        return;
                    pline = (Curve)ent as Curve;
                    if (pline == null)
                    {
                        ed.WriteMessage("\nError: selected entity is not a Curve");
                        return;
                    }
                    int num = 36;
                    double delta = (pline.EndParam - pline.StartParam) / (num + 1);
                    Point3dCollection pts = new Point3dCollection();
                    Point3d cp;
                    for (double par = pline.StartParam; par <= pline.EndParam; par += delta)
                    {
                        cp = pline.GetClosestPointTo(pline.GetPointAtParameter(par), false);
                        pts.Add(cp);
                    }
                    if (pts == null) return;
                    BlockTableRecord btr = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
                    foreach (Point3d ptcur in pts)
                    {

                        DBPoint pt = new DBPoint(ptcur);
                        pt.SetDatabaseDefaults();
                        pt.ColorIndex = 5;
                        btr.AppendEntity(pt);
                        tr.AddNewlyCreatedDBObject(pt, true);
                    }

                    tr.Commit();
                }
            }
            catch (Autodesk.AutoCAD.Runtime.Exception ex)
            {
                Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage
                    (ex.ToString());
                return;
            }
            finally
            {
                Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("\nPokey\n");
            }
        }


[owenwengerd]

My 2 cents

Tsk, Tsk

[fixo]

Well, agreed I often forget about Closestpoint issue
Kind regards,

[owenwengerd]

Well, agreed I often forget about Closestpoint issue

Did you test your code with a QuirkyPolyline?