public static Entity[] BreakOnPoint(this Curve ent, Point2d at, QuickTransaction tr, bool commitAtEnd = false)
        {
            if (ent == null)
            {
                throw new ArgumentNullException(nameof(ent));
            }
            if (tr == null)
            {
                throw new ArgumentNullException(nameof(tr));
            }
            try {
                var     btr = (BlockTableRecord)tr.GetObject(tr.Db.CurrentSpaceId, OpenMode.ForWrite);
                Point3d att = at.ToPoint3D();
                att.TransformBy(tr.Editor.CurrentUserCoordinateSystem.Inverse());
                // Check that the point is on the curve
                att = ent.GetClosestPointTo(att, false);
                var breakPoints = new Point3dCollection();
                var newCurves   = new DBObjectCollection();
                // Get the segments according to the trim points
                breakPoints.Add(att);
                newCurves = ent.GetSplitCurves(breakPoints);
                if (newCurves == null)
                {
                    tr.Editor.WriteMessage("\nGetSplitCurves failed :  Error");
                    return(new Entity[0]);
                }
                var ret = new List <Entity>();

                // Here we add the segments to the database with different colors
                for (var i = 0; i < newCurves.Count; i++)
                {
                    var pent = (Entity)newCurves[i];
                    pent.SetPropertiesFrom(ent);
                    btr.AppendEntity(pent);
                    tr.AddNewlyCreatedDBObject(pent, true);
                    ret.Add(pent);
                }

                ent.UpgradeOpen();
                ent.Erase();
                if (commitAtEnd)
                {
                    tr.Commit();
                }
                return(ret.ToArray());
            } catch (Exception ex) {
                Autodesk.AutoCAD.ApplicationServices.Core.Application.ShowAlertDialog(ex.Message + "\n" + ex.StackTrace);
                return(new Entity[0]);
            } finally { }
        }
        public static void WidthCommand()
        {
            var set = Quick.GetImpliedOrSelect();

            if (set == null || set.Count == 0)
            {
                Quick.WriteLine($"[{Quick.CurrentCommand}] No objects were selected.");
                return;
            }

            using (var tr = new QuickTransaction()) {
                var col = set.GetObjectIds().Select(o => tr.GetObject(o, true)).ToArray();
                var dbl = Quick.Editor.GetDouble(new PromptDoubleOptions("Please select width: ")
                {
                    AllowNegative = false, DefaultValue = Quick.Bag.Get("[w]width", 0.4d)
                });
                if (dbl.Status != PromptStatus.OK)
                {
                    Quick.WriteLine($"[{Quick.CurrentCommand}] Failed selecting double.");
                    return;
                }
                var val = (double)(Quick.Bag["[w]width"] = dbl.Value);
                //tr.Command("_.pedit", "_m", set, "_n", "_w", dbl.Value.ToString(), "");
                for (var i = 0; i < col.Length; i++)
                {
                    var e  = col[i];
                    var ee = e;
                    if (ee is Polyline2d)
                    {
                        ee     = ee.ConvertToPolyline(tr);
                        col[i] = ee;
                    }
                    if (ee is Polyline == false)
                    {
                        continue;
                    }
                    ((Polyline)ee).SetGlobalWidth(val);
                }
                tr.Commit();
            }
        }
 public static void MRotateCommand()
 {
     using (var tr = new QuickTransaction()) {
         // objects initializing
         var nomutt = Convert.ToInt32(Autodesk.AutoCAD.ApplicationServices.Core.Application.GetSystemVariable("nomutt"));
         try {
             // Get the current document and database
             // Start a transaction
             // Open the Block table for read
             var _sel = Quick.GetImpliedOrSelect();
             if (_sel == null || _sel.Count == 0)
             {
                 tr.Editor.WriteMessage("Nothing was selected.");
                 return;
             }
             var howmuch = tr.Editor.GetAngle("How many degrees (Anti Clockwise) to add (Negative will go Clockwise)");
             if (howmuch.Status == PromptStatus.Cancel)
             {
                 return;
             }
             var curUCSMatrix = tr.Doc.Editor.CurrentUserCoordinateSystem;
             var curUCS       = curUCSMatrix.CoordinateSystem3d;
             foreach (SelectedObject o in _sel)
             {
                 var obj    = (BlockReference)tr.GetObject(o.ObjectId) ?? throw new NullReferenceException("obj");
                 var matrix = Matrix3d.Rotation(howmuch.Value, curUCS.Zaxis, obj.Position);
                 obj.TransformBy(matrix);
             }
             // Add the new object to the block table record and the transaction
             // Save the new objects to the database
             tr.Commit();
             Quick.SetSelected(_sel);
         } catch (Exception ex) {
             Quick.WriteLine(ex.Message + "\n" + ex.StackTrace);
         } finally {
             Autodesk.AutoCAD.ApplicationServices.Core.Application.SetSystemVariable("nomutt", nomutt);
         }
     }
 }
        public static void AddCurveCommand()
        {
            double GetAngle(Point2d a, Point2d b)
            {
                double xDiff = b.X - a.X;
                double yDiff = b.Y - a.Y;

                return(Math.Atan2(yDiff, xDiff) * 180.0d / Math.PI);
            }

            try {
                var options = new PromptEntityOptions("\nSelect a point on a polyline: ");
                options.SetRejectMessage("Invalid Object.");
                options.AddAllowedClass(typeof(Polyline), true);
                options.AddAllowedClass(typeof(Polyline2d), true);
                options.AddAllowedClass(typeof(Polyline3d), true);

                var result = Quick.Editor.GetEntity(options);
                if (result.Status != PromptStatus.OK)
                {
                    return;
                }
                var lineId    = result.ObjectId;
                var pickpoint = result.PickedPoint.ToPoint2D();
                var qtarget   = Quick.Editor.GetPoint(new PromptPointOptions("Pick the strech point.")
                {
                    AllowNone = false, BasePoint = pickpoint.ToPoint3D(), UseBasePoint = true, UseDashedLine = true
                });
                if (qtarget.Status != PromptStatus.OK)
                {
                    return;
                }
                var target = qtarget.Value.ToPoint2D();
                using (var tr = new QuickTransaction()) {
                    try {
                        var poly = (Curve)tr.GetObject(lineId, OpenMode.ForWrite);
                        if (poly is Polyline2d)
                        {
                            poly = poly.ConvertToPolyline(tr);
                        }
                        if (poly is Polyline3d)
                        {
                            throw new InvalidCastException("Can't be applied on polyline of type Polyline3d.");
                        }
                        var distance = target.GetDistanceTo(pickpoint);

                        var pointRight = poly.OffsetToEnd(result.PickedPoint, distance);
                        var pointLeft  = poly.OffsetToStart(result.PickedPoint, distance);
                        if (!pointRight.Item2 || !pointLeft.Item2)
                        {
                            return;
                        }

                        var rightcut = poly.BreakOnPoint(pointRight.Item1, tr, false);
                        poly = (Polyline)rightcut[0];  //right poly
                        var rightpoly = (Polyline)rightcut[1];
                        var leftcut   = poly.BreakOnPoint(pointLeft.Item1, tr, false);
                        var leftpoly  = (Polyline)leftcut[0];
                        leftcut[1].UpgradeOpen();
                        leftcut[1].Erase();

                        var buldge = Math.Tan((90d * 0.85 * Deg2Rad) / 4);
                        leftpoly.AddVertexAt(leftpoly.NumberOfVertices, target, 0, leftpoly.GetStartWidthAt(leftpoly.NumberOfVertices - 1), leftpoly.GetEndWidthAt(leftpoly.NumberOfVertices - 1));
                        leftpoly.SetBulgeAt(leftpoly.NumberOfVertices - 2, buldge);
                        rightpoly.AddVertexAt(0, target, buldge, leftpoly.GetStartWidthAt(0), leftpoly.GetEndWidthAt(0));

                        void setdir(bool right)
                        {
                            if (right)
                            {
                                leftpoly.SetBulgeAt(leftpoly.NumberOfVertices - 2, buldge);
                                rightpoly.SetBulgeAt(0, buldge);
                            }
                            else
                            {
                                leftpoly.SetBulgeAt(leftpoly.NumberOfVertices - 2, -buldge);
                                rightpoly.SetBulgeAt(0, -buldge);
                            }
                        }

                        setdir(Settings.addcurve_direction as bool? ?? true);

                        tr.Transaction.TransactionManager.QueueForGraphicsFlush();

                        // ReSharper disable once AssignmentInConditionalExpression
                        var ask = (bool?)Quick.AskQuestion("Reverse Direction?", false) ?? false;
                        if (ask)
                        {
                            Settings.addcurve_direction = !(Settings.addcurve_direction as bool? ?? false);
                            setdir(Settings.addcurve_direction);
                        }
                        tr.Transaction.TransactionManager.QueueForGraphicsFlush();


                        // ReSharper disable once AssignmentInConditionalExpression
                        if (Settings["addcurve_join"] = Quick.AskQuestion("Join Polylines?", (Settings["addcurve_join"]) ?? !true))
                        {
                            new[] { leftpoly.Join(rightpoly, tr) }.SetSelected();
                        }
                        else
                        {
                            new[] { leftpoly, rightpoly }.SetSelected();
                        }
                        tr.Commit();
                    } catch (Exception ex) {
                        Quick.WriteLine(ex.Message + "\n" + ex.StackTrace);
                    }
                }
            } catch (Exception ex) {
                Quick.WriteLine(ex.Message + "\n" + ex.StackTrace);
            }
        }
        public static void MagicReplaceCommand()
        {
            // objects initializing
            var nomutt = Convert.ToInt32(Autodesk.AutoCAD.ApplicationServices.Core.Application.GetSystemVariable("nomutt"));
            var doc    = Autodesk.AutoCAD.ApplicationServices.Core.Application.DocumentManager.MdiActiveDocument;
            var ed     = doc.Editor;
            var db     = doc.Database;

            try {
                using (doc.LockDocument()) {
                    using (var tr = new QuickTransaction()) {
                        var toreplace = tr.GetImpliedOrSelect(new PromptSelectionOptions());
                        if (toreplace == null)
                        {
                            return;
                        }
                        ed.WriteMessage("\nSelect destinion block: ");
                        var totype = Quick.SelectSingle();
                        ed.WriteMessage("\n");
                        if (totype == null)
                        {
                            return;
                        }
                        var masterblock = (BlockTableRecord)tr.GetObject(((BlockReference)tr.GetObject(totype ?? ObjectId.Null, OpenMode.ForWrite)).BlockTableRecord, OpenMode.ForRead);
                        var bt          = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                        var @new        = bt[masterblock.Name];
                        Autodesk.AutoCAD.ApplicationServices.Core.Application.SetSystemVariable("nomutt", 0);
                        var notparsed = 0;
                        var flattern  = false;
                        var objs      = toreplace.Cast <SelectedObject>().Select(o => tr.GetObject(o.ObjectId, OpenMode.ForRead) as Entity).ToArray();
                        if (objs.Any(o => (o as BlockReference)?.Position.Z > 0))
                        {
                            flattern = Quick.AskQuestion("Should flattern blocks with Z value", true) ?? false;
                        }
                        var os = new List <ObjectId>();
                        foreach (var ent in objs)
                        {
                            var oldblk = ent as BlockReference;
                            if (oldblk == null)
                            {
                                //not block..
                                notparsed++;
                                continue;
                            }
                            var p      = oldblk.Position;
                            var ip     = flattern ? new Point3d(p.X, p.Y, 0) : p;
                            var scl    = oldblk.ScaleFactors;
                            var rot    = oldblk.Rotation;
                            var newblk = new BlockReference(ip, @new);
                            newblk.SetPropertiesFrom(ent);
                            newblk.Rotation     = rot;
                            newblk.ScaleFactors = scl;
                            tr.BlockTableRecordCurrentSpace.AppendEntity(newblk);
                            tr.AddNewlyCreatedDBObject(newblk, true);
                            ApplyAttributes(db, tr, newblk);
                            oldblk.UpgradeOpen();
                            oldblk.Erase();
                            oldblk.Dispose();
                            os.Add(newblk.ObjectId);
                        }
                        Autodesk.AutoCAD.ApplicationServices.Core.Application.SetSystemVariable("nomutt", 1);
                        tr.Commit();
                        if (notparsed > 0)
                        {
                            ed.WriteMessage($"{notparsed} are not blocks and were not replaced.\n");
                        }
                        ed.WriteMessage($"{toreplace.Count} were replaced to block {masterblock.Name} successfully.\n");
                        Quick.SetSelected(os.ToArray());
                    }
                }
            } catch (Exception ex) {
                ed.WriteMessage(ex.Message + "\n" + ex.StackTrace);
            } finally {
                Autodesk.AutoCAD.ApplicationServices.Core.Application.SetSystemVariable("nomutt", nomutt);
            }
        }