"how to add a hatch pattern in autocad database using vba" Code Answer's

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how to add a hatch pattern in autocad database using vba

Wicked Wasp on Feb 27, 2021

Public Sub HatchLines()

        Dim doc As Document = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument

        Dim docloc As DocumentLock = doc.LockDocument()

        Dim ed As Editor = doc.Editor

        Dim db As Database = doc.Database

        Dim tr As Transaction = db.TransactionManager.StartTransaction()

        Using docloc

            Using tr

                'ed.StartUserInteraction(Me)'<-- just in case you using this code from form button

                Dim peo As PromptEntityOptions = New PromptEntityOptions(vbCr & "Select first line: ")

                peo.SetRejectMessage(vbCr & "Select line only: ")

                peo.AddAllowedClass(GetType(Line), True)

                Dim pres As PromptEntityResult = ed.GetEntity(peo)

                If (pres.Status <> PromptStatus.OK) Then

                    Return

                End If

                Dim ent As Entity = CType(tr.GetObject(pres.ObjectId, OpenMode.ForRead), Entity)

                Dim line1 As Line = DirectCast(ent, Line)

                If line1 Is Nothing Then

                    Return

                End If

                peo.Message = vbCr & "Select second line: "

                pres = ed.GetEntity(peo)

                If (pres.Status <> PromptStatus.OK) Then

                    Return

                End If

                ent = CType(tr.GetObject(pres.ObjectId, OpenMode.ForRead), Entity)

                Dim line2 As Line = DirectCast(ent, Line)

                If line2 Is Nothing Then

                    Return

                End If

                Dim sp1 As Point3d = line1.StartPoint

                Dim ep1 As Point3d = line1.EndPoint

                Dim sp2 As Point3d = line2.StartPoint

                Dim ep2 As Point3d = line2.EndPoint

                'check for line directions
                If Math.Abs(line1.Angle - line2.Angle) >= Math.PI Then
                    'swap points if the second line has an opposite direction
                    Dim tmp As Point3d = sp1

                    sp1 = ep1

                    ep1 = tmp

                End If

                Dim btr As BlockTableRecord = CType(tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite), BlockTableRecord)

                Dim pl As Polyline = New Polyline()

                pl.AddVertexAt(0, New Point2d(sp1.X, sp1.Y), 0, 0, 0)

                pl.AddVertexAt(1, New Point2d(ep1.X, ep1.Y), 0, 0, 0)

                pl.AddVertexAt(2, New Point2d(ep2.X, ep2.Y), 0, 0, 0)

                pl.AddVertexAt(3, New Point2d(sp2.X, sp2.Y), 0, 0, 0)

                pl.Closed = True

                btr.AppendEntity(pl)

                tr.AddNewlyCreatedDBObject(pl, True)

                Dim ids As ObjectIdCollection = New ObjectIdCollection

                ids.Add(pl.ObjectId)

                db.TransactionManager.QueueForGraphicsFlush()

                Dim hatch As Hatch = New Hatch()

                hatch.HatchStyle = HatchStyle.Normal

                hatch.PatternScale = 60.0 '<--change hatch scale to suit

                hatch.PatternAngle = 0.0

                hatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI37") '<--change pattern name to suit

                hatch.AppendLoop(HatchLoopTypes.Outermost, ids)

                hatch.Associative = False

                hatch.EvaluateHatch(False)

                btr.SetObjectIdsInFlux()

                btr.AppendEntity(hatch)

                tr.AddNewlyCreatedDBObject(hatch, True)

                pl.Erase()

                pl.Dispose()

                ed.Regen()

                tr.Commit()

            End Using

        End Using

    End Sub

Source: forums.autodesk.com

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"how to add a hatch pattern in autocad database using vba" Code Answer's