起始点属性 （ActiveX）

签名

工 务 局：

object.StartPoint

对象

类型：圆弧，椭圆，线

此属性适用的对象。

属性值

只读：是的，除了可读写的 Line 对象

类型：变体（双精度的三元素数组）

表示对象起点的 3D 坐标。

言论

圆弧、椭圆和直线的起点

不能更改圆弧或椭圆的起点。要编辑弧，请使用和属性。要编辑椭圆，请使用、和属性。EndAngleRadiusEndAngleMajorAxisRadiusRatio

例子

工 务 局：

Sub Example_StartPoint()
    ' This example creates an elliptical arc and then
    ' finds the coordinates of its start point and endpoint.
    Dim ellObj As AcadEllipse
    Dim majAxis(0 To 2) As Double
    Dim center(0 To 2) As Double
    Dim radRatio As Double
    Dim startPoint As Variant
    Dim endPoint As Variant
    
    ' Create an ellipse in model space
    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)
    
    ' Enter a start angle of 45 degrees, and an end angle of 270 degrees
    ellObj.startAngle = 45 * (3.14 / 180)
    ellObj.endAngle = 270 * (3.14 / 180)
    ZoomAll
    
    ' Find the start and endpoints for the ellipse
    startPoint = ellObj.startPoint
    endPoint = ellObj.endPoint
    MsgBox "This ellipse has a start point of " & _
           startPoint(0) & ", " & startPoint(1) & ", " & _
           startPoint(2) & " and an endpoint of " & _
           endPoint(0) & ", " & endPoint(1) & ", " & _
           endPoint(2), vbInformation, "StartPoint Example"
End Sub

Visual LISP：

(vl-load-com)
(defun c:Example_StartPoint()
    ;; This example creates an elliptical arc and then
    ;; finds the coordinates of its start and end points.
    (setq acadObj (vlax-get-acad-object))
    (setq doc (vla-get-ActiveDocument acadObj))
    
    ;; Create an ellipse in model space
    (setq center (vlax-3d-point 5 5 0)
          majAxis (vlax-3d-point 10 20 0)
          radRatio 0.3)

    (setq modelSpace (vla-get-ModelSpace doc))  
    (setq ellObj (vla-AddEllipse modelSpace center majAxis radRatio))
    
    ;; Enter a start angle of 45 degrees, and an end angle of 270 degrees
    (vla-put-StartAngle ellObj (* 45 (/ 3.14 180)))
    (vla-put-EndAngle ellObj (* 270 (/ 3.14 180)))
    (vla-ZoomAll acadObj)
    
    ;; Find the start and endpoints for the ellipse
    (setq startPoint (vlax-safearray->list (vlax-variant-value (vla-get-StartPoint ellObj))))
    (setq endPoint (vlax-safearray->list (vlax-variant-value (vla-get-EndPoint ellObj))))
    (alert (strcat "This ellipse has a start point of " (rtos (nth 0 startPoint) 2) ", "
		                                        (rtos (nth 1 startPoint) 2) ", "
		                                        (rtos (nth 2 startPoint) 2) " and an endpoint of "
		                                        (rtos (nth 0 endPoint) 2) ", "
		                                        (rtos (nth 1 endPoint) 2) ", "
		                                        (rtos (nth 2 endPoint) 2)))
)