Marks the end of a block of operations.
Supported platforms: Windows only
No return value.
This method allows AutoCAD to close the environment so operations from StartUndoMark to EndUndoMark can be treated as a group of operations.
VBA:
Sub Example_EndUndoMark() ' This example creates a series of lines, each one with an undo marker ' defined for it. After lines are created you can switch to AutoCAD and type ' the Undo command, and only one line at a time will be undone. If StartUndoMark ' call is not made, an undo in AutoCAD will undo all the lines at once. Dim line As AcadLine Dim stPnt(0 To 2) As Double Dim endPnt(0 To 2) As Double stPnt(0) = 1: stPnt(1) = 2: stPnt(2) = 0 endPnt(0) = 2: stPnt(1) = 1: stPnt(2) = 0 ' Create the lines Dim j As Integer For j = 0 To 3 ThisDrawing.StartUndoMark Set line = ThisDrawing.ModelSpace.AddLine(stPnt, endPnt) stPnt(0) = stPnt(0) + 3 endPnt(0) = endPnt(0) + 3 ThisDrawing.EndUndoMark Next ZoomAll End Sub
Visual LISP:
(vl-load-com) (defun c:Example_EndUndoMark() ;; This example creates a series of lines, each one with an undo marker ;; defined for it. After lines are created you can switch to AutoCAD and type ;; the Undo command, and only one line at a time will be undone. If StartUndoMark ;; call is not made, an undo in AutoCAD will undo all the lines at once. (setq acadObj (vlax-get-acad-object)) (setq doc (vla-get-ActiveDocument acadObj)) (setq modelSpace (vla-get-ModelSpace doc)) (setq stPnt (vlax-3d-point 1 2 0) endPnt (vlax-3d-point 2 1 0)) ;; Create the lines (setq j 0) (while (>= 3 j) (vla-StartUndoMark doc) (setq line (vla-AddLine modelSpace stPnt endPnt)) (vlax-safearray-put-element (vlax-variant-value stPnt) 0 (+ (vlax-safearray-get-element (vlax-variant-value stPnt) 0) 3)) (vlax-safearray-put-element (vlax-variant-value endPnt) 0 (+ (vlax-safearray-get-element (vlax-variant-value endPnt) 0) 3)) (setq j (1+ j)) (vla-EndUndoMark doc) ) (vla-ZoomAll acadObj) )