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CHAPTER 14 VIEWS AND VIEWPORTS
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MsgBox "A new view called " & objView.Name & _ " has been added to the Views collection." Else MsgBox "This view already exists." End If End Sub The VIEWCTR and VIEWDIR system variables hold center and direction information. Appendix C lists all system variables.
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Setting a View as Current
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After you create a view, you ll probably want to use it. Use a Viewport object s SetView method to set one of the View objects as the current view. This method has the following syntax: ViewportObject.SetView ViewObject The parameter ViewObject is a reference to a View object, not the View object s name. The following code asks the user to enter a new view to use. If this view exists in the Views collection, the code sets it as the current view. Public Sub SetView() Dim objView As AcadView Dim objActViewPort As AcadViewport Dim strViewName As String ThisDrawing.ActiveSpace = acModelSpace Set objActViewPort = ThisDrawing.ActiveViewport 'Redefine the current ViewPort with the View info strViewName = InputBox("Enter the view you require.") If strViewName = "" Then Exit Sub On Error Resume Next Set objView = ThisDrawing.Views.Item(strViewName) If Not objView Is Nothing Then objActViewPort.SetView objView ThisDrawing.ActiveViewport = objActViewPort Else MsgBox "View was not recognized." End If End Sub
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Deleting a View
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When you finish using a view, you can delete it. Use the Delete method as follows: ViewObject.Delete
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CHAPTER 14 VIEWS AND VIEWPORTS
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The following example illustrates how to implement this method. Public Sub DeleteView() Dim objView As AcadView Dim strViewName As String Dim strExistingViewNames As String For Each objView In ThisDrawing.Views strExistingViewNames = strExistingViewNames & objView.Name & vbCrLf Next strViewName = InputBox("Existing Views: " & vbCrLf & _ strExistingViewNames & vbCrLf & _ "Enter the view you wish to delete from the list.") If strViewName = "" Then Exit Sub On Error Resume Next Set objView = ThisDrawing.Views.Item(strViewName) If Not objView Is Nothing Then objView.Delete Else MsgBox "View was not recognized." End If End Sub
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Viewports are windowed views of your drawing in model and paper space. The ActiveSpace property determines which type of viewport is in use. You construct paper-space and model-space viewports differently. The rest of this chapter explains these two approaches.
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The Model-Space Viewport
Model-space viewports give you a number of windows in which to view and edit your model. The MAXACTVP system variable controls the maximum number of active viewports, and it s initially set to 64. Remember, though, that each new viewport adversely affects performance, so keep the number of active viewports to a minimum. The following code shows how to create a model-space viewport. The paragraphs after the code explain this fairly involved procedure. Public Sub CreateViewport() Dim objViewPort As AcadViewport Dim objCurrentViewport As AcadViewport Dim varLowerLeft As Variant Dim dblViewDirection(2) As Double Dim strViewPortName As String
CHAPTER 14 VIEWS AND VIEWPORTS
strViewPortName = InputBox("Enter a name for the new viewport.") 'user cancelled If strViewPortName = "" Then Exit Sub 'check if viewport already exists On Error Resume Next Set objViewPort = ThisDrawing.Viewports.Item(strViewPortName) If Not objViewPort Is Nothing Then MsgBox "Viewport already exists" Exit Sub End If 'Create a new viewport Set objViewPort = ThisDrawing.Viewports.Add(strViewPortName) 'Split the screen viewport into 4 windows objViewPort.Split acViewport4 For Each objCurrentViewport In ThisDrawing.Viewports If objCurrentViewport.LowerLeftCorner(0) = 0 Then If objCurrentViewport.LowerLeftCorner(1) = 0 Then 'this takes care of Top view dblViewDirection(0) = 0 dblViewDirection(1) = 0 dblViewDirection(2) = 1 objCurrentViewport.Direction = dblViewDirection Else 'this takes care of Front view dblViewDirection(0) = 0 dblViewDirection(1) = -1 dblViewDirection(2) = 0 objCurrentViewport.Direction = dblViewDirection End If End If If objCurrentViewport.LowerLeftCorner(0) = 0.5 Then If objCurrentViewport.LowerLeftCorner(1) = 0 Then 'this takes care of the Right view dblViewDirection(0) = 1 dblViewDirection(1) = 0 dblViewDirection(2) = 0 objCurrentViewport.Direction = dblViewDirection Else 'this takes care of the Isometric view dblViewDirection(0) = 1 dblViewDirection(1) = -1 dblViewDirection(2) = 1 objCurrentViewport.Direction = dblViewDirection End If End If
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