How to Flip a Drawing in Autocad 2016

You can rotate all drawing objects and attribute reference objects.

To rotate an object, use the Rotation function of a transformation matrix. This function requires a rotation angle represented in radians, an axis of rotation, and a base point. The axis of rotation must be expressed as a Vector3d object and the base point as a Point3d object. This angle determines how far an object rotates around the base point relative to its current location.

Rotate a polyline about a base point

This example creates a closed lightweight polyline, and then rotates the polyline 45 degrees about the base point (4, 4.25, 0).

VB.NET

Imports Autodesk.AutoCAD.Runtime Imports Autodesk.AutoCAD.ApplicationServices Imports Autodesk.AutoCAD.DatabaseServices Imports Autodesk.AutoCAD.Geometry   <CommandMethod("RotateObject")> _ Public Sub RotateObject()     '' Get the current document and database     Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument     Dim acCurDb As Database = acDoc.Database      '' Start a transaction     Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()          '' Open the Block table for read         Dim acBlkTbl As BlockTable         acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, _                                      OpenMode.ForRead)          '' Open the Block table record Model space for write         Dim acBlkTblRec As BlockTableRecord         acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _                                         OpenMode.ForWrite)          '' Create a lightweight polyline         Using acPoly As Polyline = New Polyline()             acPoly.AddVertexAt(0, New Point2d(1, 2), 0, 0, 0)             acPoly.AddVertexAt(1, New Point2d(1, 3), 0, 0, 0)             acPoly.AddVertexAt(2, New Point2d(2, 3), 0, 0, 0)             acPoly.AddVertexAt(3, New Point2d(3, 3), 0, 0, 0)             acPoly.AddVertexAt(4, New Point2d(4, 4), 0, 0, 0)             acPoly.AddVertexAt(5, New Point2d(4, 2), 0, 0, 0)              '' Close the polyline             acPoly.Closed = True              Dim curUCSMatrix As Matrix3d = acDoc.Editor.CurrentUserCoordinateSystem             Dim curUCS As CoordinateSystem3d = curUCSMatrix.CoordinateSystem3d              '' Rotate the polyline 45 degrees, around the Z-axis of the current UCS             '' using a base point of (4,4.25,0)             acPoly.TransformBy(Matrix3d.Rotation(0.7854, _                                                  curUCS.Zaxis, _                                                  New Point3d(4, 4.25, 0)))              '' Add the new object to the block table record and the transaction             acBlkTblRec.AppendEntity(acPoly)             acTrans.AddNewlyCreatedDBObject(acPoly, True)         End Using          '' Save the new objects to the database         acTrans.Commit()     End Using End Sub

C#

using Autodesk.AutoCAD.Runtime; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.Geometry;   [CommandMethod("RotateObject")] public static void RotateObject() {     // Get the current document and database     Document acDoc = Application.DocumentManager.MdiActiveDocument;     Database acCurDb = acDoc.Database;      // Start a transaction     using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())     {         // Open the Block table for read         BlockTable acBlkTbl;         acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,                                      OpenMode.ForRead) as BlockTable;          // Open the Block table record Model space for write         BlockTableRecord acBlkTblRec;         acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],                                         OpenMode.ForWrite) as BlockTableRecord;          // Create a lightweight polyline         using (Polyline acPoly = new Polyline())         {             acPoly.AddVertexAt(0, new Point2d(1, 2), 0, 0, 0);             acPoly.AddVertexAt(1, new Point2d(1, 3), 0, 0, 0);             acPoly.AddVertexAt(2, new Point2d(2, 3), 0, 0, 0);             acPoly.AddVertexAt(3, new Point2d(3, 3), 0, 0, 0);             acPoly.AddVertexAt(4, new Point2d(4, 4), 0, 0, 0);             acPoly.AddVertexAt(5, new Point2d(4, 2), 0, 0, 0);              // Close the polyline             acPoly.Closed = true;              Matrix3d curUCSMatrix = acDoc.Editor.CurrentUserCoordinateSystem;             CoordinateSystem3d curUCS = curUCSMatrix.CoordinateSystem3d;              // Rotate the polyline 45 degrees, around the Z-axis of the current UCS             // using a base point of (4,4.25,0)             acPoly.TransformBy(Matrix3d.Rotation(0.7854,                                                  curUCS.Zaxis,                                                  new Point3d(4, 4.25, 0)));              // Add the new object to the block table record and the transaction             acBlkTblRec.AppendEntity(acPoly);             acTrans.AddNewlyCreatedDBObject(acPoly, true);         }          // Save the new objects to the database         acTrans.Commit();     } }

VBA/ActiveX Code Reference

Sub RotateObject()     ' Create the polyline     Dim plineObj As AcadLWPolyline     Dim points(0 To 11) As Double     points(0) = 1: points(1) = 2     points(2) = 1: points(3) = 3     points(4) = 2: points(5) = 3     points(6) = 3: points(7) = 3     points(8) = 4: points(9) = 4     points(10) = 4: points(11) = 2     Set plineObj = ThisDrawing.ModelSpace. _                                     AddLightWeightPolyline(points)     plineObj.Closed = True     ZoomAll       ' Define the rotation of 45 degrees about a     ' base point of (4, 4.25, 0)     Dim basePoint(0 To 2) As Double     Dim rotationAngle As Double     basePoint(0) = 4: basePoint(1) = 4.25: basePoint(2) = 0     rotationAngle = 0.7853981   ' 45 degrees       ' Rotate the polyline     plineObj.Rotate basePoint, rotationAngle     plineObj.Update End Sub

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Source: https://help.autodesk.com/cloudhelp/2016/ENU/AutoCAD-NET/files/GUID-DAF76951-DD0C-413F-86A8-471E2B94C1C0.htm#!

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