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AutoCAD 2022 开发者帮助

MomentOfInertia 属性（ActiveX）

2024-5-18 18:45| 发布者: admin| 查看: 68| 评论: 0|原作者: admin|来自: AutoCAD

获取固体的惯性矩。

支持的平台：仅限 Windows

签名

VBA：

object.MomentOfInertia

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）

基于当前坐标系的 3D 坐标。

言论

转动惯量返回为定义为变体的 X、Y 和 Z 坐标。

例子

VBA：

Sub Example_MomentOfInertia()
    ' This example creates a box in model space.
    ' It then returns the MomentOfInertia 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 MomentOfInertia for the box
    Dim momentOfInertia As Variant
    momentOfInertia = boxObj.momentOfInertia
    MsgBox "The MomentOfInertia for the box is " & momentOfInertia(0) & ", " & momentOfInertia(1) & ", " & momentOfInertia(2), , "MomentOfInertia Example"
        
End Sub

可视化 LISP：

(vl-load-com)
(defun c:Example_MomentOfInertia()
    ;; This example creates a box in model space.
    ;; It then returns the MomentOfInertia 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 MomentOfInertia for the box
    (setq momentOfInertia (vlax-variant-value (vla-get-MomentOfInertia boxObj)))
    (alert (strcat "The MomentOfInertia for the box is " (rtos (vlax-safearray-get-element momentOfInertia 0) 2) ", "
                                                         (rtos (vlax-safearray-get-element momentOfInertia 1) 2) ", "
                                                         (rtos (vlax-safearray-get-element momentOfInertia 2) 2)))
)