breakFeatures automatically

[joantopo]

Hi.

Civil 3D has command: BreakFeatures.

I want to do the same but automatically.

I have a point3dcollection and feature line Id.

I want to create a new break for each point3d position.

Are there any ways to do this?

Perhaps I could use breakfeatures with "SendToExecute" but how can I do it  without any requests to user?

Thank you.

[Jeff_M]

I think you are out of luck with the SurveyFigures. These are created using the Survey database and cannot be directly created by the user (or developer). We can glean information from them, but not much else.

[joantopo]

OK.

Then, I will ask to user by prompt(line command) if he want to convert all survey figures to feature lines.

[joantopo]

Hi Jeff.

Have you been able to improve the GetSplitFeaturelines() method?

[Jeff_M]

Not yet, Joan. Hope to have it working properly soon.

[Jeff_M]

Sorry for the delay, Joan. Here is a working version of the GetSplitFeaturelines() extension method. It works with your test drawing, even when adding elevation points along the featurline. Only accepts Point3dCollection to define where the breaks are to be. Also tested with arc'ed featurelines and appears to be working in all cases.

        /// <summary>
        /// Method to split a Featureline using Point3dCollection
        /// </summary>
        /// <param name=""></param>
        /// <returns></returns>
        public static DBObjectCollection GetSplitFeaturelines(this FeatureLine fline, Point3dCollection pts)
        {
            DBObjectCollection ids = new DBObjectCollection();
            Polyline poly = fline.BaseCurve2d();
            DBObjectCollection splitpolys = poly.GetSplitCurves(pts);
            using (Transaction tr = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction())
            {
                AcApp.Document doc = AcApp.Application.DocumentManager.MdiActiveDocument;
                Database db = doc.Database;
                BlockTable bt = (BlockTable)db.BlockTableId.GetObject(OpenMode.ForRead);
                BlockTableRecord btr = (BlockTableRecord)bt[BlockTableRecord.ModelSpace].GetObject(OpenMode.ForWrite);
                Site site = (Site)fline.SiteId.GetObject(OpenMode.ForRead);
                ObjectId siteId = fline.ObjectId;
                FeatureLineStyle style = (FeatureLineStyle)fline.StyleId.GetObject(OpenMode.ForRead);
                double[] elevpts = fline.GetPoints(2);

                fline.Erase(); //temporarily erase the featureline to prevent it from affecting the elevations of the new f/l's
                foreach (Polyline p in splitpolys)
                {
                    btr.AppendEntity(p);
                    tr.AddNewlyCreatedDBObject(p, true);
                    ObjectId newflId = site.AddFeatureFromPoly(p, style);
                    p.Erase();
                    FeatureLine newfl = (FeatureLine)newflId.GetObject(OpenMode.ForWrite);
                    newfl.Layer = fline.Layer;
                    //Set the new PI elevations
                    foreach (Point3d pt3d in pts)
                    {                        
                        try
                        {
                            newfl.SetPointElevation(pt3d);
                        }
                        catch { }
                    }
                    //Add in the elevation points
                    for (int i = 0; i < elevpts.GetLength(0); i = i + 3)
                    {
                        try
                        {
                            Point3d newpt = new Point3d(elevpts[i], elevpts[i + 1], elevpts[i + 2]);
                            newfl.InsertPoint(newpt, 2);
                        }
                        catch { }
                    }
                    ids.Add(newfl);                    
                }
                fline.Erase(false);//now unerase the f/l
                tr.Commit();
            }
            return ids;
        }

[joantopo]

Thank you very much, Jeff. I will try it today.

[joantopo]

Hi Jeff. Could you try this drawing file with your new method? Sometimes it works fine with arcs and point elevations but with this example doesn´t work fine. Thanks.

[joantopo]

I can´t edit last message. I wanted to say "check the drawing file".

[joantopo]

this is the drawing file.

[Jeff_M]

Looks like the attachments aren't working for your drawing. You can email me direct at jeffm AT quuxsoft DOT com

[joantopo]

Hi Jeff. I think that I have found the bug. autoCAD Civil 3D 2014 has a bug with GetSplitCurves You use that method : DBObjectCollection splitpolys = poly.GetSplitCurves(pts); For example, in this drawing file, I have a polyline. If I try to split the polyline I have the same error if I convert it to feature line and then use your method. https://www.mediafire.com/?ihud5gkurrdgn0i In this case, GetSplitCurves should return 13 new segments and only returns 8. I think that your method works fine. The trouble is GetSplitCurves() from autoCAD API.

[joantopo]

perhaps is this,

http://adndevblog.typepad.com/autocad/2012/09/acdbpolylinegetsplitcurves-only-adds-new-vertices-in-s...

[Jeff_M]

Not sure why you are only getting 8 segments, Joan. I'm getting 13 as expected:

How are you getting the Point3dCollection defining the intersection points? This is what I used after converting the long polyline to a featureline:

                Point3dCollection points = new Point3dCollection();
                Plane planeXY = new Plane(new Point3d(0, 0, 0), Vector3d.ZAxis);
                fl.IntersectWith(pline, Intersect.OnBothOperands, planeXY, points, IntPtr.Zero, IntPtr.Zero);
                try
                {
                    points.Remove(fl.StartPoint);
                }
                catch
                { }
                try
                {
                    points.Remove(fl.EndPoint);
                }
                catch { }

                DBObjectCollection dbc = fl.GetSplitFeaturelines(points);

[joantopo]

Is strange because I do IntersectWith() also. Perhaps is this: "The behavior of getSplitCurves() is affected by the order of the points in the AcGePoint3dArray. If the points are appended to the AcGePoint3dArray in the order that they would be if they were measured from the start point of the polyline then the expected behavior occurs. (two polylines are returned). The following code snippet uses this approach. It finds the distance on the curve from the start of the curve to the point, and then add the points to the array in the order of their distance from the start of the curve. " I´m going to check the order of the returned points with IntersectWith().

[joantopo]

This is my point3dcollection that i get using IntersectWith() {(22253.6286721642,10175.6595364167,0)} {(22565.5511610607,10154.521986322,0)} {(21697.5303172888,10213.343760069,0)} {(21899.4227926654,10199.6624370996,0)} {(20970.2442938738,10493.6080228632,0)} {(20797.9019969427,10711.031953553,0)} {(21348.4907711799,11700.0371465383,0)} {(21074.7143128375,11345.3010261631,0)} {(22326.4630667873,11807.985975522,0)} {(23738.1939874421,11577.9079377702,0)} {(23693.4108665027,10560.7814278764,0)} {(23839.0633251464,10867.7008067035,0)} They are disordered.

[Jeff_M]

Can you share some code, Joan? No matter how I use IntersectWith() I get 12 points, all in correct order.

[joantopo]

I have you sent an email.

[Jeff_M]

OK, looks like we cannot expect the IntersectWith() method to return the Points in any particular order. Must sort them in order to properly use GetSplitCurves(). Must go check my own code now....