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SnapBasePoint 属性（ActiveX）

2024-5-18 17:53| 发布者: admin| 查看: 81| 评论: 0|原作者: admin|来自: AutoCAD

指定视口的对齐基点。

支持的平台：仅限 Windows

签名

VBA：

object.SnapBasePoint

对象

类型：PViewport、视口

此属性应用于的对象。

属性值

只读：不

类型：变体（双精度的双元素数组）

表示视口的捕捉基点的 2D WCS 坐标。

言论

不能更改活动图纸空间视口的对齐基点。

在执行对 or 方法的调用之前，对此属性的更改不会反映在显示中。UpdateRegen

注意：此属性的值存储在 SNAPBASE 系统变量中。

例子

VBA：

Sub Example_SnapBasePoint()
    ' This example changes the snap base point for a
    ' model space and paper space viewport.
    
    ' Create a new model space viewport
    Dim viewportObj As AcadViewport
    Set viewportObj = ThisDrawing.Viewports.Add("NewViewport")
    
    ' Find the current snap base point
    Dim currSnapPnt As Variant
    currSnapPnt = viewportObj.SnapBasePoint
    MsgBox "The current model space snap base point is " & viewportObj.SnapBasePoint(0) & ", " & viewportObj.SnapBasePoint(1), , "SnapBasePoint Example"
    
    ' Change the snap base point
    Dim newSnapPnt(0 To 1) As Double
    newSnapPnt(0) = 5#: newSnapPnt(1) = 5#
    viewportObj.SnapBasePoint = newSnapPnt
    MsgBox "The new model space snap base point is " & viewportObj.SnapBasePoint(0) & ", " & viewportObj.SnapBasePoint(1), , "SnapBasePoint Example"
    
    ' Create a new paper space viewport
    Dim pviewportObj As AcadPViewport
    Dim center(0 To 2) As Double
    Dim width As Double
    Dim height As Double
    
    center(0) = 3: center(1) = 3: center(2) = 0
    width = 40
    height = 40
    ThisDrawing.ActiveSpace = acPaperSpace
    Set pviewportObj = ThisDrawing.PaperSpace.AddPViewport(center, width, height)
    
    ' Find the current snap base point
    currSnapPnt = pviewportObj.SnapBasePoint
    MsgBox "The current paper space snap base point is " & pviewportObj.SnapBasePoint(0) & ", " & pviewportObj.SnapBasePoint(1), , "SnapBasePoint Example"
    
    ' Change the snap base point
    newSnapPnt(0) = 2#: newSnapPnt(1) = 2#
    pviewportObj.SnapBasePoint = newSnapPnt
    MsgBox "The new paper space snap base point is " & pviewportObj.SnapBasePoint(0) & ", " & pviewportObj.SnapBasePoint(1), , "SnapBasePoint Example"

End Sub

可视化 LISP：

(vl-load-com)
(defun c:Example_SnapBasePoint()
    ;; This example changes the snap base point for a
    ;; model space and paper space viewport.
    (setq acadObj (vlax-get-acad-object))
    (setq doc (vla-get-ActiveDocument acadObj))

    ;; Create a new model space viewport
    (setq viewportObj (vla-Add (vla-get-Viewports doc) "NewViewport"))
    
    ;; Find the current snap base point
    (setq currSnapPnt (vlax-variant-value (vla-get-SnapBasePoint viewportObj)))
    (alert (strcat "The current model space snap base point is " (rtos (vlax-safearray-get-element currSnapPnt 0) 2) ", "
                                                                 (rtos (vlax-safearray-get-element currSnapPnt 1) 2)))

    ;; Change the snap base point
    (setq newSnapPnt (vlax-make-safearray vlax-vbDouble '(0 . 1)))
    (vlax-safearray-fill newSnapPnt '(5 5)) 
    (vla-put-SnapBasePoint viewportObj newSnapPnt)

    (alert (strcat "The new model space snap base point is " (rtos (vlax-safearray-get-element newSnapPnt 0) 2) ", "
                                                             (rtos (vlax-safearray-get-element newSnapPnt 1) 2)))

    ;; Create a new paper space viewport
    (setq center (vlax-3d-point 3 3 0)
          width 40
	         height 40)

    (vla-put-ActiveSpace doc acPaperSpace)
    (setq paperSpace (vla-get-PaperSpace doc))
    (setq pviewportObj (vla-AddPViewport paperSpace center width height))
    
    ;; Find the current snap base point
    (setq currSnapPnt (vlax-variant-value (vla-get-SnapBasePoint pviewportObj)))
    (alert (strcat "The current paper space snap base point is " (rtos (vlax-safearray-get-element currSnapPnt 0) 2) ", "
                                                                 (rtos (vlax-safearray-get-element currSnapPnt 1) 2)))
    
    ;; Change the snap base point
    (setq newSnapPnt (vlax-make-safearray vlax-vbDouble '(0 . 1)))
    (vlax-safearray-fill newSnapPnt '(2 2)) 
    (vla-put-SnapBasePoint pviewportObj newSnapPnt)

    (alert (strcat "The new paper space snap base point is " (rtos (vlax-safearray-get-element newSnapPnt 0) 2) ", "
                                                             (rtos (vlax-safearray-get-element newSnapPnt 1) 2)))
)