topic Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon in .NET Forum

Streatch Command code in C#.net to streatch multiple segements of closed polygon

kbharathy9 — Tue, 09 Jan 2024 08:04:01 GMT

Hi,

I want to streatch multiple segments of closed polygon using C#.net as we can streatch with AutoCAD command.

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

b_karunakar75 — Tue, 09 Jan 2024 11:14:12 GMT

I will check and let you know

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

kbharathy9 — Tue, 09 Jan 2024 11:15:48 GMT

Please condiser Jig while streatching the feature.

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

_gile — Tue, 09 Jan 2024 14:08:42 GMT

Hi,

Here's a PolylineStretchJig example (the 'indexes' parameter contains the polyline indexes to stretch).

class PolylineStretchJig : EntityJig { Polyline _pline; Plane _plane; Dictionary<int, Point2d> _vertices; Point3d _basePoint, _dragPoint; public PolylineStretchJig(Polyline pline, Point3d basePoint, List<int> indexes) : base(pline) { _pline = pline; _plane = new Plane(Point3d.Origin, pline.Normal); _vertices = indexes.ToDictionary(i => i, i => pline.GetPoint2dAt(i)); _basePoint = basePoint; } protected override SamplerStatus Sampler(JigPrompts prompts) { var jppo = new JigPromptPointOptions() { Message = "\nSpecify second point: ", BasePoint = _basePoint, UseBasePoint = true }; var result = prompts.AcquirePoint(jppo); if (result.Value.IsEqualTo(_dragPoint)) return SamplerStatus.NoChange; _dragPoint = result.Value; return SamplerStatus.OK; } protected override bool Update() { Vector2d vector = (_dragPoint - _basePoint).Convert2d(_plane); foreach (var vertex in _vertices) { _pline.SetPointAt(vertex.Key, vertex.Value + vector); } return true; } }

A testing command (should work as expected when View == Top).

public void Test() { var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; var promptEntityOptions = new PromptEntityOptions("\nSelect Polyline to strech: "); promptEntityOptions.SetRejectMessage("\nSelected object is not a polyline."); promptEntityOptions.AddAllowedClass(typeof(Polyline), true); var promptEntityResult = ed.GetEntity(promptEntityOptions); if (promptEntityResult.Status != PromptStatus.OK) return; var promptPointResult = ed.GetPoint("\nSelect vertices to stretch: "); if (promptPointResult.Status != PromptStatus.OK) return; var promptCornerResult = ed.GetCorner("\nSpecify the opposite corner", promptPointResult.Value); if (promptCornerResult.Status != PromptStatus.OK) return; using (var tr = db.TransactionManager.StartTransaction()) { var ucs = ed.CurrentUserCoordinateSystem; var extents = new Extents3d(); extents.AddPoint(promptPointResult.Value); extents.AddPoint(promptCornerResult.Value); extents.TransformBy(ucs); var pline = (Polyline)tr.GetObject(promptEntityResult.ObjectId, OpenMode.ForWrite); var indexes = new List<int>(); bool IsPointInside(Point3d pt) => extents.MinPoint.X <= pt.X && extents.MinPoint.Y <= pt.Y && extents.MinPoint.Z <= pt.Z && pt.X <= extents.MaxPoint.X && pt.Y <= extents.MaxPoint.Y && pt.Z <= extents.MaxPoint.Z; for (int i = 0; i < pline.NumberOfVertices; i++) { if (IsPointInside(pline.GetPoint3dAt(i))) indexes.Add(i); } if (indexes.Count == 0) return; promptPointResult = ed.GetPoint("\nSpecify base point: "); if (promptPointResult.Status != PromptStatus.OK) return; var basePoint = promptPointResult.Value.TransformBy(ucs); var jig = new PolylineStretchJig(pline, basePoint, indexes); var promptResult = ed.Drag(jig); if (promptResult.Status != PromptStatus.OK) return; tr.Commit(); } }

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

ActivistInvestor — Wed, 10 Jan 2024 03:43:56 GMT

Hi @_gile, aside from performance reasons with a large number of vertices, I can think of several other reasons why I would prefer using Entity.MoveStretchPointsAt() verses manually moving each vertex as per your example.

Those other reasons are related to hatching: associative dimensions; and more generally, involvement in any kind of associative network where other objects have a dependence on the polyline.

Also, with Entity.MoveStretchPointsAt(), the solution would stretch any Entity, rather than just polylines.

Here is your example, hastily refactored to work with any Entity (untested):

using System; using System.Linq; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Geometry; using Autodesk.AutoCAD.Runtime; /// <summary> /// Gile's example, refactored to stretch /// any type of Entity that can be stretched. /// </summary> namespace Examples { class EntityStretchJig : EntityJig { Entity entity; IntegerCollection indices; Point3d basePoint; Point3d lastPoint; Point3d samplePoint; public EntityStretchJig(Entity entity, Point3d basePoint, IntegerCollection indexes) : base(entity) { if(entity == null) throw new ArgumentNullException(nameof(entity)); if(!entity.IsWriteEnabled) throw new Autodesk.AutoCAD.Runtime.Exception(ErrorStatus.NotOpenForWrite); Point3dCollection stretchPoints = new Point3dCollection(); entity.GetStretchPoints(stretchPoints); if(stretchPoints.Count == 0) throw new ArgumentException("Can't stretch the given entity"); if(indices.Count > stretchPoints.Count) throw new ArgumentException("Invalid index array"); if(indices.Cast<int>().Max() >= stretchPoints.Count) throw new IndexOutOfRangeException(); this.entity = entity; this.indices = indexes; this.basePoint = basePoint; this.lastPoint = basePoint; } protected override SamplerStatus Sampler(JigPrompts prompts) { var jppo = new JigPromptPointOptions() { Message = "\nSpecify second point: ", BasePoint = basePoint, UseBasePoint = true }; var result = prompts.AcquirePoint(jppo); if(result.Status != PromptStatus.OK) return SamplerStatus.Cancel; if(result.Value.IsEqualTo(lastPoint)) return SamplerStatus.NoChange; samplePoint = result.Value; return SamplerStatus.OK; } protected override bool Update() { entity.MoveStretchPointsAt(indices, samplePoint - lastPoint); lastPoint = samplePoint; return true; } } public static class TestCase { [CommandMethod("MYSTRETCH")] public static void Test() { var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; var peo = new PromptEntityOptions("\nSelect entity to strech: "); var per = ed.GetEntity(peo); if(per.Status != PromptStatus.OK) return; var ppr = ed.GetPoint("\nSelect vertices to stretch: "); if(ppr.Status != PromptStatus.OK) return; var pcr = ed.GetCorner("\nSpecify the opposite corner", ppr.Value); if(pcr.Status != PromptStatus.OK) return; var ucs = ed.CurrentUserCoordinateSystem; var extents = new Extents3d(); extents.AddPoint(ppr.Value); extents.AddPoint(pcr.Value); extents.TransformBy(ucs); Point3dCollection stretchPoints = new Point3dCollection(); using(var tr = db.TransactionManager.StartTransaction()) { var entity = (Entity)tr.GetObject(per.ObjectId, OpenMode.ForRead); entity.GetStretchPoints(stretchPoints); tr.Commit(); } /// Let's try to avoid user interatiion inside an /// active transaction, to avoid undesired side- /// effects of aborting the transaction (e.g., /// undoing transparent pans/zooms, etc.). if(stretchPoints.Count == 0) { ed.WriteMessage("\nCan't stretch selected entity."); return; } IntegerCollection list = new IntegerCollection(stretchPoints.Count); for(int i = 0; i < stretchPoints.Count; i++) { if(extents.Contains(stretchPoints[i])) list.Add(i); } if(list.Count == 0) return; ppr = ed.GetPoint("\nSpecify base point: "); if(ppr.Status != PromptStatus.OK) return; var basePoint = ppr.Value.TransformBy(ucs); using(var tr = db.TransactionManager.StartTransaction()) { var entity = (Entity)tr.GetObject(per.ObjectId, OpenMode.ForWrite); var jig = new EntityStretchJig(entity, basePoint, list); var promptResult = ed.Drag(jig); if(promptResult.Status != PromptStatus.OK) return; tr.Commit(); } } } public static class NoCopyAndPasteExtensions { public static bool Contains(this Extents3d extents, Point3d pt) { Point3d min = extents.MinPoint; Point3d max = extents.MaxPoint; return min.X <= pt.X && min.Y <= pt.Y && min.Z <= pt.Z && pt.X <= max.X && pt.Y <= max.Y && pt.Z <= max.Z; } } }

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

_gile — Wed, 10 Jan 2024 07:20:31 GMT

@ActivistInvestor

I didn't know this method.

Thanks for make me (us) discover it and for the code sample.

There's a little mistake (typo?) in the EntityStretchJig constructor: 'indices' instead of 'indexes' lines 36 and 38.

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

ActivistInvestor — Wed, 10 Jan 2024 07:58:15 GMT

Hi @_gile, thanks for pointing out that bug. The last thing I did before copying it was to move all the assignments to the bottom of the constructor, not realizing that was a mistake.

using System; using System.Linq; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Geometry; using Autodesk.AutoCAD.Runtime; /// <summary> /// Gile's example, refactored to stretch /// any type of Entity that can be stretched. /// </summary> namespace Examples { class EntityStretchJig : EntityJig { Entity entity; IntegerCollection indices; Point3d basePoint; Point3d lastPoint; Point3d samplePoint; public EntityStretchJig(Entity entity, Point3d basePoint, IntegerCollection indexes) : base(entity) { if(entity == null) throw new ArgumentNullException(nameof(entity)); if(indexes == null) throw new ArgumentNullException(nameof(indexes)); if(!entity.IsWriteEnabled) throw new Autodesk.AutoCAD.Runtime.Exception(ErrorStatus.NotOpenForWrite); Point3dCollection stretchPoints = new Point3dCollection(); entity.GetStretchPoints(stretchPoints); if(stretchPoints.Count == 0) throw new ArgumentException("Can't stretch the given entity"); if(indexes.Count > stretchPoints.Count) throw new ArgumentException("Invalid index array"); if(indexes.Cast<int>().Max() >= stretchPoints.Count) throw new IndexOutOfRangeException(); this.indices = indexes; this.entity = entity; this.basePoint = basePoint; this.lastPoint = basePoint; } protected override SamplerStatus Sampler(JigPrompts prompts) { var jppo = new JigPromptPointOptions() { Message = "\nSpecify second point: ", BasePoint = basePoint, UseBasePoint = true }; var result = prompts.AcquirePoint(jppo); if(result.Status != PromptStatus.OK) return SamplerStatus.Cancel; if(result.Value.IsEqualTo(lastPoint)) return SamplerStatus.NoChange; samplePoint = result.Value; return SamplerStatus.OK; } protected override bool Update() { entity.MoveStretchPointsAt(indices, samplePoint - lastPoint); lastPoint = samplePoint; return true; } } public static class TestCase { [CommandMethod("MYSTRETCH")] public static void Test() { var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; var peo = new PromptEntityOptions("\nSelect entity to strech: "); var per = ed.GetEntity(peo); if(per.Status != PromptStatus.OK) return; var ppr = ed.GetPoint("\nSelect vertices to stretch: "); if(ppr.Status != PromptStatus.OK) return; var pcr = ed.GetCorner("\nSpecify the opposite corner", ppr.Value); if(pcr.Status != PromptStatus.OK) return; var ucs = ed.CurrentUserCoordinateSystem; var extents = new Extents3d(); extents.AddPoint(ppr.Value); extents.AddPoint(pcr.Value); extents.TransformBy(ucs); Point3dCollection stretchPoints = new Point3dCollection(); using(var tr = db.TransactionManager.StartTransaction()) { var entity = (Entity)tr.GetObject(per.ObjectId, OpenMode.ForRead); entity.GetStretchPoints(stretchPoints); tr.Commit(); } /// Try to avoid user interatiion inside an /// active transaction, to avoid undesired side- /// effects of aborting the transaction (e.g., /// undoing transparent pans/zooms, etc.). if(stretchPoints.Count == 0) { ed.WriteMessage("\nCan't stretch selected entity."); return; } IntegerCollection list = new IntegerCollection(stretchPoints.Count); for(int i = 0; i < stretchPoints.Count; i++) { if(extents.Contains(stretchPoints[i])) list.Add(i); } if(list.Count == 0) return; ppr = ed.GetPoint("\nSpecify base point: "); if(ppr.Status != PromptStatus.OK) return; var basePoint = ppr.Value.TransformBy(ucs); using(var tr = db.TransactionManager.StartTransaction()) { var entity = (Entity)tr.GetObject(per.ObjectId, OpenMode.ForWrite); var jig = new EntityStretchJig(entity, basePoint, list); var promptResult = ed.Drag(jig); if(promptResult.Status != PromptStatus.OK) return; tr.Commit(); } } } public static class NoCopyAndPasteExtensions { public static bool Contains(this Extents3d extents, Point3d pt) { Point3d min = extents.MinPoint; Point3d max = extents.MaxPoint; return min.X <= pt.X && min.Y <= pt.Y && min.Z <= pt.Z && pt.X <= max.X && pt.Y <= max.Y && pt.Z <= max.Z; } } }

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

kbharathy9 — Wed, 10 Jan 2024 09:21:09 GMT

Thank you @_gile . The code you shared is working fine for me.

Re: Streatch Command code in C#.net to streatch multiple segements of closed polygon

_gile — Wed, 10 Jan 2024 09:37:37 GMT

@kbharathy9

The code shared by @ActivistInvestor (message #7) is more robust. You should use it instead.