Segment of a Polyline

naveenkuma.mukku — Tue, 13 Jun 2023 21:53:12 GMT

Can you please let me know how to get the segment of a polyline between the two points i derived. I tried using GetSplitCurves() but couldn't get precise segment.

Thank you

Re: Segment of a Polyline

norman.yuan — Wed, 14 Jun 2023 00:49:10 GMT

If you looked at the Polyline class (in Object Browser window of Visual Studio), you would have found a bunch of methods: GetXxxxx(int). These methods are the one you can use to find out information on each segment of a Polyline.

Re: Segment of a Polyline

Miralkong — Wed, 14 Jun 2023 02:44:33 GMT

After using GetSplitCurves(), you could test if any segment intersects with both cutting point to get the exact segment.

[CommandMethod("splitpoly")] public void Test() { Document acDoc = AcadApp.DocumentManager.MdiActiveDocument; Database acDb = acDoc.Database; Editor ed = acDoc.Editor; using(Transaction acTrans = acDoc.TransactionManager.StartTransaction()) { // Get blocktable and blocltablerecord BlockTable acBlkTbl = acTrans.GetObject(acDb.BlockTableId,OpenMode.ForRead) as BlockTable; BlockTableRecord acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],OpenMode.ForWrite) as BlockTableRecord; // Get polyline PromptEntityResult plRet = ed.GetEntity("Please pick a polyline\n"); if (plRet.Status != PromptStatus.OK) { return; } Polyline pl = acTrans.GetObject(plRet.ObjectId, OpenMode.ForWrite) as Polyline; if(pl == null) { return; } // Get cutting point PromptPointResult pt1Ret = ed.GetPoint("Please pick the first split point on previous selected polyline.\n"); if (pt1Ret.Status != PromptStatus.OK) { return; } Point3d pt1 = pt1Ret.Value; PromptPointResult pt2Ret = ed.GetPoint("Please pick the second split point on previous selected polyline.\n"); if (pt2Ret.Status != PromptStatus.OK) { return; } Point3d pt2 = pt2Ret.Value; // Get cutting point collection Point3dCollection ptColl = new Point3dCollection(); ptColl.Add(pt1); ptColl.Add(pt2); // Split the polyline with point collection DBObjectCollection dbColl = pl.GetSplitCurves(ptColl); // If any segment of the polyline intersects with both two cutting points, add it to database. foreach (DBObject obj in dbColl) { Polyline subPl = obj as Polyline; Point3d startPt = subPl.StartPoint; Point3d endPt = subPl.EndPoint; if((pt1 == startPt && pt2 == endPt) || (pt1 == endPt && pt2 == startPt)) { subPl.ConstantWidth = 2; acBlkTblRec.AppendEntity(subPl); acTrans.AddNewlyCreatedDBObject(subPl,true); } } acTrans.Commit(); } }

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Segment of a Polyline

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