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PrincipalMoments 属性（ActiveX）

2024-5-18 18:45| 发布者: admin| 查看: 296| 评论: 0|原作者: admin|来自: AutoCAD

获取实体或区域的主矩属性。

支持的平台：仅限 Windows

签名

VBA：

object.PrincipalMoments

对象

类型：3DSolid、区域

此属性应用于的对象。

属性值

只读：是的

类型：变体（双打的三元素阵列）

在当前坐标系上计算的 X、Y 和 Z 坐标。

言论

主力矩以 X、Y 和 Z 坐标的形式返回，定义为变体。它们是根据当前坐标系计算的。

例子

VBA：

Sub Example_PrincipalMoments()
    ' This example creates a box in model space.
    ' It then returns the PrincipalMoments for that box.
        
    Dim boxObj As Acad3DSolid
    Dim length As Double, width As Double, height As Double
    Dim center(0 To 2) As Double
    
    ' Define the box
    center(0) = 5#: center(1) = 5#: center(2) = 0
    length = 5#: width = 7: height = 10#
    
    ' Create the box (3DSolid) object in model space
    Set boxObj = ThisDrawing.ModelSpace.AddBox(center, length, width, height)
    
    ' Change the viewing direction of the viewport to better see the box
    Dim NewDirection(0 To 2) As Double
    NewDirection(0) = -1: NewDirection(1) = -1: NewDirection(2) = 1
    ThisDrawing.ActiveViewport.direction = NewDirection
    ThisDrawing.ActiveViewport = ThisDrawing.ActiveViewport
    ZoomAll
    
    ' Return the PrincipalMoments for the box
    Dim PrincipalMoments As Variant
    PrincipalMoments = boxObj.PrincipalMoments
    MsgBox "The PrincipalMoments for the box are " & PrincipalMoments(0) & ", " & PrincipalMoments(1) & ", " & PrincipalMoments(2), , "PrincipalMoments Example"
        
End Sub

可视化 LISP：

(vl-load-com)
(defun c:Example_PrincipalMoments()
    ;; This example creates a box in model space.
    ;; It then returns the PrincipalMoments for that box.
    (setq acadObj (vlax-get-acad-object))
    (setq doc (vla-get-ActiveDocument acadObj))
    
    ;; Define the box
    (setq center (vlax-3d-point 5 5 0)
          boxLength 5
	         boxWidth 7
	         boxHeight 10)
    
    ;; Create the box (3DSolid) object in model space
    (setq modelSpace (vla-get-ModelSpace doc))
    (setq boxObj (vla-AddBox modelSpace center boxLength boxWidth boxHeight))
    
    ;; Change the viewing direction of the viewport to better see the box
    (setq NewDirection (vlax-3d-point -1 -1 1))
    (setq activeViewport (vla-get-ActiveViewport doc))
    (vla-put-Direction activeViewport NewDirection)
    (vla-put-ActiveViewport doc activeViewport)
    (vla-ZoomAll acadObj)
    
    ;; Return the PrincipalMoments for the box
    (setq PrincipalMoments (vlax-variant-value (vla-get-PrincipalMoments boxObj)))
    (alert (strcat "The PrincipalMoments for the box are "
                   (rtos (vlax-safearray-get-element PrincipalMoments 0) 2) ", "
                   (rtos (vlax-safearray-get-element PrincipalMoments 1) 2) ", "
                   (rtos (vlax-safearray-get-element PrincipalMoments 2) 2)))
)