清除方法 （ActiveX）

签名

工 务 局：

object.Clear

对象

类型：选择集

此方法适用的对象。

返回值（RetVal）

无返回值。

言论

从选择集中清除的项目将保留在图形中;它们只是不再与选择集相关联。

要清除选择集中项目的子集，请使用该方法。RemoveItems

此方法与该方法的不同之处在于它不会从图形中删除对象。Delete

例子

工 务 局：

Sub Example_Clear()
    ' This example creates a selection set and several objects.
    ' It then adds the objects to the selection set. It then
    ' clears the objects from the selection set.
    
    ' Create the new selection set
    Dim ssetObj As AcadSelectionSet
    Set ssetObj = ThisDrawing.SelectionSets.Add("TEST_SELECTIONSET")
    
    ' Create a Ray object in model space
    Dim rayObj As AcadRay
    Dim basePoint(0 To 2) As Double
    Dim SecondPoint(0 To 2) As Double
    basePoint(0) = 3#: basePoint(1) = 3#: basePoint(2) = 0#
    SecondPoint(0) = 1#: SecondPoint(1) = 3#: SecondPoint(2) = 0#
    Set rayObj = ThisDrawing.ModelSpace.AddRay(basePoint, SecondPoint)
    
    ' Create a polyline object in model space
    Dim plineObj As AcadLWPolyline
    Dim points(0 To 5) As Double
    points(0) = 3: points(1) = 7
    points(2) = 9: points(3) = 2
    points(4) = 3: points(5) = 5
    Set plineObj = ThisDrawing.ModelSpace.AddLightWeightPolyline(points)
    plineObj.Closed = True

    ' Create a line object in model space
    Dim lineObj As AcadLine
    Dim startPoint(0 To 2) As Double
    Dim endPoint(0 To 2) As Double
    startPoint(0) = 0: startPoint(1) = 0: startPoint(2) = 0
    endPoint(0) = 2: endPoint(1) = 2: endPoint(2) = 0
    Set lineObj = ThisDrawing.ModelSpace.AddLine(startPoint, endPoint)
    
    ' Create a circle object in model space
    Dim circObj As AcadCircle
    Dim centerPt(0 To 2) As Double
    Dim radius As Double
    centerPt(0) = 20: centerPt(1) = 30: centerPt(2) = 0
    radius = 3
    Set circObj = ThisDrawing.ModelSpace.AddCircle(centerPt, radius)

    ' Create an ellipse object in model space
    Dim ellObj As AcadEllipse
    Dim majAxis(0 To 2) As Double
    Dim center(0 To 2) As Double
    Dim radRatio As Double
    center(0) = 5#: center(1) = 5#: center(2) = 0#
    majAxis(0) = 10: majAxis(1) = 20#: majAxis(2) = 0#
    radRatio = 0.3
    Set ellObj = ThisDrawing.ModelSpace.AddEllipse(center, majAxis, radRatio)

    ZoomAll
    
    ' Iterate through the model space collection.
    ' Collect the objects found into an array of objects
    ' to be added to the selection set.
    ReDim ssobjs(0 To ThisDrawing.ModelSpace.count - 1) As AcadEntity
    Dim I As Integer
    For I = 0 To ThisDrawing.ModelSpace.count - 1
        Set ssobjs(I) = ThisDrawing.ModelSpace.Item(I)
    Next
    
    ' Add the array of objects to the selection set
    ssetObj.AddItems ssobjs
    GoSub LISTOBJS
    
    ' Clear the selection set
    ssetObj.Clear
    
    ThisDrawing.Regen acActiveViewport
    GoSub LISTOBJS
Exit Sub
LISTOBJS:
    
        ' List all the objects in the selection set
        If ssetObj.count = 0 Then
            MsgBox "The selection set is empty"
        Else
            For I = 0 To ssetObj.count - 1
                MsgBox "The selection set contains: " & ssetObj.Item(I).ObjectName
            Next
        End If
        Return
    
End Sub

Visual LISP:

(vl-load-com)
(defun c:Example_Clear()
    ;; This example creates a selection set and several objects.
    ;; It then adds the objects to the selection set. It then
    ;; clears the objects from the selection set.
    (setq acadObj (vlax-get-acad-object))
    (setq doc (vla-get-ActiveDocument acadObj))
    (setq modelSpace (vla-get-ModelSpace doc))
  
    ;; Create the new selection set
    (setq ssetObj (vla-Add (vla-get-SelectionSets doc) "TEST_SELECTIONSET"))
    
    ;; Create a Ray object in model space
    (setq basePoint (vlax-3d-point 3 3 0)
          secondPoint (vlax-3d-point 1 3 0))
    (setq rayObj (vla-AddRay modelSpace basePoint SecondPoint))
    
    ;; Create a polyline object in model space
    (setq points (vlax-make-safearray vlax-vbDouble '(0 . 5)))
    (vlax-safearray-fill points '(3 7
				                              9 2
				                              3 5
				                             )
    )

    (setq plineObj (vla-AddLightWeightPolyline modelSpace points))
    (vla-put-Closed plineObj :vlax-true)

    ;; Create a line object in model space
    (setq startPoint (vlax-3d-point 0 0 0)
          endPoint (vlax-3d-point 2 2 0))
    (setq lineObj (vla-AddLine modelSpace startPoint endPoint))
    
    ;; Create a circle object in model space
    (setq centerPt (vlax-3d-point 20 30 0)
          radius 3)
    (setq circObj (vla-AddCircle modelSpace centerPt radius))

    ;; Create an ellipse object in model space
    (setq center (vlax-3d-point 5 5 0)
          majAxis (vlax-3d-point 10 20 0)
          radRatio 0.3)
    (setq ellObj (vla-AddEllipse modelSpace center majAxis radRatio))

    (vla-ZoomAll acadObj)
    
    ;; Iterate through the model space collection.
    ;; Collect the objects found into an array of objects
    ;; to be added to the selection set.
    (setq ssobjs (vlax-make-safearray vlax-vbObject (cons 0 (- (vla-get-Count modelSpace) 1))))
    (setq I 0)
    (while (>= (- (vla-get-Count modelSpace) 1) I)
        (vlax-safearray-put-element ssobjs I (vla-Item modelSpace I))
        (setq I (1+ I))
    )
    
    ;; Add the array of objects to the selection set
    (vla-AddItems ssetObj ssobjs)

    ;; List all the objects in the selection set
    (if (> (vla-get-Count ssetObj) 0)
        (progn
	    (setq msg (strcat "The selection set contains " (itoa (vla-get-Count ssetObj)) " objects of types: "))
            (vlax-for obj ssetObj
                (setq msg (strcat msg "\n" (vla-get-ObjectName obj)))
            )
            (alert msg)	  
        )
    )
  
    ;; Clear the selection set
    (vla-Clear ssetObj)
    
    (vla-Regen doc acActiveViewport)

    ;; List all the objects in the selection set
    (if (= (vla-get-Count ssetObj) 0)
        (alert "The selection set is empty.")
    )
)