topic Re: How to determine whether an object is Array(Rectangular)? in .NET Forum

How to determine whether an object is Array(Rectangular)?

583408432 — Sat, 09 Dec 2023 07:35:19 GMT

I use the following code:

editor.WriteMessage($"\nType: {ent.GetType().FullName}");

just return:

Type: Autodesk.AutoCAD.DatabaseServices.BlockReference

I'm trying to get the specific type, like below:

Re: How to determine whether an object is Array(Rectangular)?

kerry_w_brown — Sat, 09 Dec 2023 21:43:37 GMT

@583408432 ,

jeff hornsby posted some code in vb.net at the swamp in 2012.

I have converted it to C#

Parts of this may lead you in the direction you want to go.

using System; using System.Collections.Generic; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.Runtime; using CadApp = Autodesk.AutoCAD.ApplicationServices.Application; using OpenMode = Autodesk.AutoCAD.DatabaseServices.OpenMode; // translated from https://www.theswamp.org/index.php?topic=37921.msg464332#msg464332 [assembly: CommandClass(typeof(Class1))] public partial class Class1 { [CommandMethod("ReplaceItems")] public void ReplaceItems() { Document doc = CadApp.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; CadApp.ShowAlertDialog("Replace items in Associative Array\n original code by JeffH @ theSwamp\n mod to C# by kdub_nz"); var peo1 = new PromptEntityOptions(Environment.NewLine + "Select an Associative Array: "); PromptEntityResult per1 = ed.GetEntity(peo1); if (per1.Status != PromptStatus.OK) { return; } if (!AssocArray.IsAssociativeArray(per1.ObjectId)) { ed.WriteMessage(Environment.NewLine + "Not an Associative Array, please try again..."); return; } var fullSubentityPaths = new List<FullSubentityPath>(); if (AcHelper.SelectNestedEntities(Environment.NewLine + "Select array items: ", ref fullSubentityPaths) != PromptStatus.OK) { return; } CadApp.ShowAlertDialog(fullSubentityPaths.Count.ToString()); var peo2 = new PromptEntityOptions(Environment.NewLine + "Select entity for substitution: "); PromptEntityResult per2 = ed.GetEntity(peo2); if (per2.Status != PromptStatus.OK) { return; } PromptPointResult ppr = ed.GetPoint(Environment.NewLine + "Select base point: "); if (ppr.Status != PromptStatus.OK) { return; } try { using (Transaction tr = db.TransactionManager.StartTransaction()) { AssocArray array = AssocArray.GetAssociativeArray(per1.ObjectId); ItemLocator[] ItemLocators = AssocArray.getItemLocators(fullSubentityPaths.ToArray()); var substEntities = new ObjectIdCollection(); substEntities.Add(per2.ObjectId); var basePoint = new VertexRef(ppr.Value); array.ReplaceItems(ItemLocators, substEntities, basePoint); AssocManager.EvaluateTopLevelNetwork(db, default, 0); tr.Commit(); } } catch (Autodesk.AutoCAD.Runtime.Exception ex) { CadApp.ShowAlertDialog(ex.Message + ex.StackTrace); } } //------------------------------------ public partial class AcHelper { public static PromptStatus SelectNestedEntities(string prompt, ref ObjectIdCollection ids, ref List<FullSubentityPath> mypaths) { Document doc = CadApp.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; using (Transaction tr = db.TransactionManager.StartTransaction()) { ids = new ObjectIdCollection(); var pathsList = new List<FullSubentityPath>(); var pneo = new PromptNestedEntityOptions(prompt); pneo.AllowNone = true; // Loop until cancelled or completed while (true) { PromptNestedEntityResult rs = ed.GetNestedEntity(pneo); // Return whether the function was cancelled if (rs.Status != PromptStatus.OK) { mypaths = pathsList; // '.ToArray() UnhighlightSubEntities(mypaths.ToArray()); return rs.Status != PromptStatus.None ? rs.Status : PromptStatus.OK; } ids.Add(rs.ObjectId); var path = HighlightSubEntity(rs); if (path != FullSubentityPath.Null) { pathsList.Add(path); } } } } public static PromptStatus SelectNestedEntities(string prompt, ref List<FullSubentityPath> mypaths) { var ids = new ObjectIdCollection(); return SelectNestedEntities(prompt, ref ids, ref mypaths); } private static FullSubentityPath HighlightSubEntity(PromptNestedEntityResult rs) { // Extract relevant information from the prompt object ObjectId selId = rs.ObjectId; var objIds = new List<ObjectId>(rs.GetContainers()); // Reverse the "containers" list objIds.Reverse(); // Now append the selected entity objIds.Add(selId); // Retrieve the sub-entity path for this entity var subEnt = new SubentityId(SubentityType.Null, IntPtr.Zero); var path = new FullSubentityPath(objIds.ToArray(), subEnt); // Open the outermost container, relying on the open transaction... Entity ent = objIds[0].GetObject(OpenMode.ForRead) as Entity; // ... and highlight the nested entity if (ent is null) { return FullSubentityPath.Null; } ent.Highlight(path, false); // Return the sub-entity path for later unhighlighting return path; } private static void UnhighlightSubEntities(FullSubentityPath[] mypaths) { foreach (FullSubentityPath path in mypaths) { if (path == FullSubentityPath.Null) { continue; } ObjectId[] ids = path.GetObjectIds(); Entity ent = ids[0].GetObject(OpenMode.ForRead) as Entity; if (ent is not null) { ent.Unhighlight(path, false); } } } } }

Regards,

Re: How to determine whether an object is Array(Rectangular)?

_gile — Sat, 09 Dec 2023 22:23:45 GMT

Hi,

Here's a way to determine the type of associative array via the DXF data.

public enum AssocArrayType { None, Rectangular, Path, Polar } public static class Extension { public static AssocArrayType GetAssocArrayType(BlockReference br) { if (AssocArray.IsAssociativeArray(br.ObjectId)) return AssocArrayType.None; var dependencyId = AssocDependency.GetFirstDependencyOnObject(br); var dependency = (AssocDependency)dependencyId.GetObject(OpenMode.ForRead); var dxfData = dependency.OwningAction.EntGet().AsArray(); if (dxfData.Any(tv => tv == new TypedValue(1, "AxesAngle"))) return AssocArrayType.Rectangular; if (dxfData.Any(tv => tv == new TypedValue(1, "FillAngle"))) return AssocArrayType.Polar; if (dxfData.Any(tv => tv == new TypedValue(1, "FillPath"))) return AssocArrayType.Path; else return AssocArrayType.None; } [System.Security.SuppressUnmanagedCodeSecurity] [DllImport("acdb24.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "?acdbGetAdsName@@YA?AW4ErrorStatus@Acad@@AEAY01_JVAcDbObjectId@@@Z")] private static extern ErrorStatus acdbGetAdsName(out AdsName ename, ObjectId id); [System.Security.SuppressUnmanagedCodeSecurity] [DllImport("accore.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "acdbEntGet")] private static extern System.IntPtr acdbEntGet(AdsName ename); /// <summary> /// Get the DXF definition data (like AutoLISP entget function). /// </summary> /// <param name="id">Instance to which the method applies.</param> /// <returns>The DXF data.</returns> /// <exception cref="Exception">Thrown in case of invalid objectId.</exception> public static ResultBuffer EntGet(this ObjectId id) { var errorStatus = acdbGetAdsName(out AdsName ename, id); if (errorStatus != ErrorStatus.OK) throw new Exception(errorStatus); var result = acdbEntGet(ename); if (result != System.IntPtr.Zero) return ResultBuffer.Create(result, true); return null; } }

Re: How to determine whether an object is Array(Rectangular)?

kerry_w_brown — Sat, 09 Dec 2023 23:01:41 GMT

And add these to the [message 2] Class1 class

and have a play

[CommandMethod("RectandPolarAssocArr")] public void RectandPolarAssocArr() { Document doc = CadApp.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; using (Transaction tr = db.TransactionManager.StartTransaction()) { var rectArrayEntitiesIds = new ObjectIdCollection(); var polarArrayEntitiesIds = new ObjectIdCollection(); BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead); BlockTableRecord modelSpace = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite); var circle = new Circle(Point3d.Origin, Vector3d.ZAxis, 5); modelSpace.AppendEntity(circle); tr.AddNewlyCreatedDBObject(circle, true); var line = new Line(Point3d.Origin, new Point3d(5, 0, 0)); modelSpace.AppendEntity(line); tr.AddNewlyCreatedDBObject(line, true); rectArrayEntitiesIds.Add(circle.ObjectId); polarArrayEntitiesIds.Add(line.ObjectId); var rectParams = new AssocArrayRectangularParameters() { ColumnCount = 10, ColumnSpacing = 10, RowCount = 10, RowSpacing = 10, RowElevation = 0, LevelCount = 10, LevelSpacing = 10, XAxisDirection = Vector3d.XAxis, YAxisDirection = Vector3d.YAxis, BasePoint = new VertexRef(new Point3d(50, 50, 0)) }; AssocArray.CreateArray(rectArrayEntitiesIds, rectParams.BasePoint, rectParams); var polarParams = new AssocArrayPolarParameters() { FillAngle = 360, AngleBetweenItems = 10, ItemCount = 36, RowCount = 10, RowElevation = 10, RowSpacing = 10, Radius = 30, Direction = AssocArrayPolarParameters.ArcDirection.CounterClockwise, StartAngle = 0, RotateItems = true }; AssocArray.CreateArray(polarArrayEntitiesIds, new VertexRef(new Point3d(100, 100, 0)), polarParams); tr.Commit(); } } [CommandMethod("ModifyRectandPolarAssocArr")] public void ModifyRectandPolarAssocArr() { Document doc = CadApp.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor ed = doc.Editor; using (Transaction tr = db.TransactionManager.StartTransaction()) { var peo = new PromptEntityOptions(Environment.NewLine + "Select a Array: "); PromptEntityResult per = ed.GetEntity(peo); if (per.Status != PromptStatus.OK) { return; } if (!AssocArray.IsAssociativeArray(per.ObjectId)) { return; } AssocArray array = AssocArray.GetAssociativeArray(per.ObjectId); if (array.GetParameters() is AssocArrayPolarParameters) { AssocArrayPolarParameters arrayPolarParam = (AssocArrayPolarParameters)array.GetParameters(); arrayPolarParam.ItemCount = arrayPolarParam.ItemCount / 2; arrayPolarParam.RowCount = arrayPolarParam.RowCount / 2; arrayPolarParam.RowSpacing = arrayPolarParam.RowSpacing / 2; arrayPolarParam.Commit(); } else if (array.GetParameters() is AssocArrayRectangularParameters) { AssocArrayRectangularParameters arrayRecParam = (AssocArrayRectangularParameters)array.GetParameters(); arrayRecParam.ColumnCount = arrayRecParam.ColumnCount / 2; arrayRecParam.RowCount = arrayRecParam.RowCount / 2; arrayRecParam.RowSpacing = arrayRecParam.RowSpacing / 2; arrayRecParam.Commit(); } else { return; } tr.Commit(); } }

Re: How to determine whether an object is Array(Rectangular)?

_gile — Sun, 10 Dec 2023 07:48:12 GMT

@kerry_w_brown Nice! AssocArrayParameters is the way I was looking for and didn't find.

So, "to determine whether an object is Array(Rectangular)", we could simply do:

private static bool IsAssociativeRectangularArray(ObjectId id) => AssocArray.IsAssociativeArray(id) && AssocArray.GetAssociativeArray(id).GetParameters() is AssocArrayRectangularParameters;

Re: How to determine whether an object is Array(Rectangular)?

kerry_w_brown — Sun, 10 Dec 2023 08:07:51 GMT

@_gile,

Yes Gilles,

I think there is enough there to lead to a variety of solutions.
Jeff did some great original research which gives us lots of options.

If it had been c# instead of vb.net it would have gotten more attention, and that's a pity !

Re: How to determine whether an object is Array(Rectangular)?

583408432 — Mon, 11 Dec 2023 14:15:33 GMT

Thanks for the answer! Very elegant solution, exactly what I was looking for. The only downside is that it only works with NET40+, it won't work in lower versions of AutoCAD.

Re: How to determine whether an object is Array(Rectangular)?

ActivistInvestor — Wed, 13 Dec 2023 00:20:03 GMT

The only reason it won't work in the version of .net/C# that you're using is because that language version does not support expression-bodied members, which is what @_gile 's code uses.

It's a simple matter to rewrite it so that it will work on the version of C# that you are using. Just replace '=> <expr>;' with '{return <expr>;}'.