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Normal 属性（ActiveX）

2024-5-18 18:57| 发布者: admin| 查看: 294| 评论: 0|原作者: admin|来自: AutoCAD

Normal 属性（ActiveX）

指定对象的三维法线单位向量。

支持的平台：仅限 Windows

签名

VBA：

object.Normal

对象

类型：弧、属性、属性引用、块引用、圆、比较参考、 Dim3PointAngular、 DimAligned、 DimAngular、 DimArcLength、 DimDiametric、维度、 DimOrdinate、 DimRadial、 DimRadialLarge、 DimRotated、椭圆、 ExternalReference、填充、引线、线条、LWPolyline、MInsertBlock、MText、点、折线、区域、部分、形状、实体、文本、公差、跟踪

此属性应用于的对象。

属性值

只读：不

类型：变体（双打的三元素阵列）

WCS 中的 3D 法向单位向量。

言论

此法向量定义给定对象的 Z 轴。尽管在 WCS 中返回法线，但它可用于确定对象的 OCS。在将坐标与 OCS 相互转换时，在方法中使用此属性作为 OCSNormal。TranslateCoordinates

请注意，此属性指定向量，而不是点。向量定义法线的方向，而不是空间中的位置。您可以将此法向量添加到一个点以获得另一个点。

公差：法向量必须垂直于物体的方向。不垂直于 Tolerance 对象的法线将生成错误。Tolerance

例子

VBA：

Sub Example_Normal()
    ' This example creates a circle in model space.
    ' It then finds the current normal to that circle
    ' and changes the normal.
    
    ' Define a circle
    Dim circleObj As AcadCircle
    Dim center(0 To 2) As Double
    Dim radius As Double
    center(0) = 4: center(1) = 4: center(2) = 0
    radius = 1
    
    ' Add the circle to model space
    Set circleObj = ThisDrawing.ModelSpace.AddCircle(center, radius)
    ZoomAll
    
    ' Find the normal for the circle
    Dim currNormal As Variant
    currNormal = circleObj.Normal
    MsgBox "The current normal for the circle is " & circleObj.Normal(0) & ", " & circleObj.Normal(1) & ", " & circleObj.Normal(2), , "Normal Example"
    
    ' Change the normal for the circle
    Dim newNormal(0 To 2) As Double
    newNormal(0) = 1: newNormal(1) = 1: newNormal(2) = -1
    circleObj.Normal = newNormal
    circleObj.Update
    MsgBox "The current normal for the circle is " & circleObj.Normal(0) & ", " & circleObj.Normal(1) & ", " & circleObj.Normal(2), , "Normal Example"
    
End Sub

可视化 LISP：

(vl-load-com)
(defun c:Example_Normal()
    ;; This example creates a circle in model space.
    ;; It then finds the current normal to that circle
    ;; and changes the normal.
    (setq acadObj (vlax-get-acad-object))
    (setq doc (vla-get-ActiveDocument acadObj))

    ;; Define a circle
    (setq center (vlax-3d-point 4 4 0)
          radius 1)
    
    ;; Add the circle to model space
    (setq modelSpace (vla-get-ModelSpace doc))
    (setq circleObj (vla-AddCircle modelSpace center radius))
    (vla-ZoomAll acadObj)
    
    ;; Find the normal for the circle
    (setq currNormal (vlax-variant-value (vla-get-Normal circleObj)))
    (alert (strcat "The current normal for the circle is " (rtos (vlax-safearray-get-element currNormal 0) 2) ", "
                                                           (rtos (vlax-safearray-get-element currNormal 1) 2) ", "
                                                           (rtos (vlax-safearray-get-element currNormal 2) 2)))
    
    ;; Change the normal for the circle
    (setq newNormal (vlax-3d-point 1 1 -1))
    (vla-put-Normal circleObj newNormal)
    (vla-Update circleObj)
    (setq newNormal (vlax-variant-value newNormal))
    (alert (strcat "The current normal for the circle is " (rtos (vlax-safearray-get-element newNormal 0) 2) ", "
                                                           (rtos (vlax-safearray-get-element newNormal 1) 2) ", "
                                                           (rtos (vlax-safearray-get-element newNormal 2) 2)))
)