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Add sample AutoCAD command implementations
Introduce several C# command classes for AutoCAD, including listing layers, mirroring and rotating selections, offsetting polylines, creating regular polygons, rectangles (by width/height and by two points), triangles from three points, and simple text notes. These samples provide basic geometric and entity manipulation utilities for testing and demonstration purposes.
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‎Test/ListLayersSimple.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class ListLayersSimple
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{
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[CommandMethod("ListLayersSimple")]
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public static void ListLayers()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var lt = (LayerTable)tr.GetObject(db.LayerTableId, OpenMode.ForRead);
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foreach (var id in lt)
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{
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var ltr = (LayerTableRecord)tr.GetObject(id, OpenMode.ForRead);
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ed.WriteMessage($"\nLayer: {ltr.Name}");
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}
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tr.Commit();
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}
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}
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}

‎Test/MirrorSelection.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class MirrorSelection
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{
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[CommandMethod("MirrorSel")]
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public static void MirrorSelectedEntities()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var selRes = ed.GetSelection();
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if (selRes.Status != PromptStatus.OK) return;
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var p1Res = ed.GetPoint("\nMirror line start:");
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if (p1Res.Status != PromptStatus.OK) return;
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var p2Res = ed.GetPoint("\nMirror line end:");
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if (p2Res.Status != PromptStatus.OK) return;
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var line = new Line3d(p1Res.Value, p2Res.Value);
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var mirror = Matrix3d.Mirroring(line);
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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foreach (SelectedObject so in selRes.Value)
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{
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if (so.ObjectId.IsNull) continue;
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var ent = tr.GetObject(so.ObjectId, OpenMode.ForRead) as Entity;
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if (ent == null) continue;
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var clone = ent.Clone() as Entity;
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if (clone == null) continue;
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clone.TransformBy(mirror);
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ms.AppendEntity(clone);
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tr.AddNewlyCreatedDBObject(clone, true);
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}
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tr.Commit();
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}
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}
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}

‎Test/OffsetPolylineSample.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class OffsetPolylineSample
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{
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[CommandMethod("OffsetPL")]
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public static void OffsetSelectedPolyline()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var peo = new PromptEntityOptions("\nSelect Polyline to offset:");
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peo.SetRejectMessage("\nEntity is not a Polyline.");
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peo.AddAllowedClass(typeof(Polyline), exactMatch: true);
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var per = ed.GetEntity(peo);
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if (per.Status != PromptStatus.OK) return;
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var distRes = ed.GetDistance("\nOffset distance:");
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if (distRes.Status != PromptStatus.OK) return;
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double d = distRes.Value;
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var pl = (Polyline)tr.GetObject(per.ObjectId, OpenMode.ForRead);
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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var offs = pl.GetOffsetCurves(d);
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foreach (DBObject dbo in offs)
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{
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if (dbo is Entity ent)
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{
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ms.AppendEntity(ent);
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tr.AddNewlyCreatedDBObject(ent, true);
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}
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}
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tr.Commit();
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}
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}
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}

‎Test/PolygonRegular.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class PolygonRegular
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{
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[CommandMethod("PolygonN")]
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public static void CreateRegularPolygon()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var centerRes = ed.GetPoint("\nCenter point:");
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if (centerRes.Status != PromptStatus.OK) return;
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var radiusRes = ed.GetDistance("\nRadius:");
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if (radiusRes.Status != PromptStatus.OK) return;
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var sidesOpts = new PromptIntegerOptions("\nNumber of sides:")
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{
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AllowNone = false,
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LowerLimit = 3,
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UpperLimit = 128
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};
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var sidesRes = ed.GetInteger(sidesOpts);
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if (sidesRes.Status != PromptStatus.OK) return;
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int n = sidesRes.Value;
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double r = radiusRes.Value;
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var c = centerRes.Value;
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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var pl = new Polyline { Closed = true };
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for (int i = 0; i < n; i++)
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{
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double ang = (2.0 * System.Math.PI / n) * i;
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double x = c.X + r * System.Math.Cos(ang);
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double y = c.Y + r * System.Math.Sin(ang);
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pl.AddVertexAt(i, new Point2d(x, y), 0, 0, 0);
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}
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ms.AppendEntity(pl);
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tr.AddNewlyCreatedDBObject(pl, true);
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tr.Commit();
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}
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}
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}

‎Test/RectangleByWidthHeight.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class RectangleByWidthHeight
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{
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[CommandMethod("RectWH")]
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public static void CreateRectangleByWidthHeight()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var baseRes = ed.GetPoint("\nBase (lower-left) point:");
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if (baseRes.Status != PromptStatus.OK) return;
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var wRes = ed.GetDistance("\nWidth:");
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if (wRes.Status != PromptStatus.OK) return;
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var hRes = ed.GetDistance("\nHeight:");
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if (hRes.Status != PromptStatus.OK) return;
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double w = wRes.Value;
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double h = hRes.Value;
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var p = baseRes.Value;
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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var pl = new Polyline { Closed = true };
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pl.AddVertexAt(0, new Point2d(p.X, p.Y), 0, 0, 0);
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pl.AddVertexAt(1, new Point2d(p.X + w, p.Y), 0, 0, 0);
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pl.AddVertexAt(2, new Point2d(p.X + w, p.Y + h), 0, 0, 0);
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pl.AddVertexAt(3, new Point2d(p.X, p.Y + h), 0, 0, 0);
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ms.AppendEntity(pl);
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tr.AddNewlyCreatedDBObject(pl, true);
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tr.Commit();
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}
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}
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}

‎Test/RectangleFromTwoPoints.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class RectangleFromTwoPoints
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{
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[CommandMethod("Rect2Pts")]
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public static void CreateRectangleFromTwoCorners()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var p1Res = ed.GetPoint("\nPick first corner:");
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if (p1Res.Status != PromptStatus.OK) return;
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var p2Res = ed.GetCorner(new PromptCornerOptions("\nPick opposite corner:", p1Res.Value));
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if (p2Res.Status != PromptStatus.OK) return;
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var p1 = p1Res.Value;
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var p2 = p2Res.Value;
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// Compute other corners (axis-aligned)
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var p3 = new Point3d(p1.X, p2.Y, p1.Z);
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var p4 = new Point3d(p2.X, p1.Y, p1.Z);
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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var pl = new Polyline { Closed = true };
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pl.AddVertexAt(0, new Point2d(p1.X, p1.Y), 0, 0, 0);
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pl.AddVertexAt(1, new Point2d(p3.X, p3.Y), 0, 0, 0);
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pl.AddVertexAt(2, new Point2d(p2.X, p2.Y), 0, 0, 0);
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pl.AddVertexAt(3, new Point2d(p4.X, p4.Y), 0, 0, 0);
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ms.AppendEntity(pl);
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tr.AddNewlyCreatedDBObject(pl, true);
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tr.Commit();
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}
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}
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}

‎Test/RotateSelection.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class RotateSelection
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{
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[CommandMethod("RotateSel")]
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public static void RotateSelectedEntities()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var selRes = ed.GetSelection();
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if (selRes.Status != PromptStatus.OK) return;
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var baseRes = ed.GetPoint("\nBase point:");
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if (baseRes.Status != PromptStatus.OK) return;
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var angRes = ed.GetAngle(baseRes.Value.ToString());
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if (angRes.Status != PromptStatus.OK) return;
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double angleRad = angRes.Value; // already radians
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var rot = Matrix3d.Rotation(angleRad, Vector3d.ZAxis, baseRes.Value);
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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foreach (SelectedObject so in selRes.Value)
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{
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var ent = tr.GetObject(so.ObjectId, OpenMode.ForRead) as Entity;
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if (ent == null) continue;
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var clone = ent.Clone() as Entity;
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if (clone == null) continue;
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clone.TransformBy(rot);
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ms.AppendEntity(clone);
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tr.AddNewlyCreatedDBObject(clone, true);
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}
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tr.Commit();
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}
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}
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}

‎Test/TextNoteSimple.cs‎

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using Autodesk.AutoCAD.ApplicationServices.Core;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.EditorInput;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.Runtime;
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namespace Test;
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public class TextNoteSimple
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{
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[CommandMethod("TextNote")]
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public static void CreateTextNote()
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{
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var doc = Application.DocumentManager.MdiActiveDocument;
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var db = doc.Database;
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var ed = doc.Editor;
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var pRes = ed.GetPoint("\nInsertion point:");
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if (pRes.Status != PromptStatus.OK) return;
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var sRes = ed.GetString("\nText content:");
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if (sRes.Status != PromptStatus.OK) return;
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using (var tr = db.TransactionManager.StartTransaction())
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{
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var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
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var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
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var txt = new DBText
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{
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Position = pRes.Value,
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Height = 2.5,
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TextString = sRes.StringResult
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};
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ms.AppendEntity(txt);
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tr.AddNewlyCreatedDBObject(txt, true);
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tr.Commit();
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}
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}
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}

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