Specifies the end parameter for an ellipse.
Supported platforms: Windows only
Read-only: No
Type: Double
The valid range is 0 to 2*PI.
The start and end parameters of the ellipse are calculated based on the following equation:
P(Theta) = A * cos(Theta) + B * sin(Theta)
where A and B are the semimajor and semiminor axes respectively.
For example, if your start angle is Theta1, the corresponding start parameter is P(Theta1) calculated based on the above formula. Similarly, if your end angle is Theta2, the corresponding end parameter is P(Theta2) calculated based on the above formula.
You can use either an angle or a parameter to create the ellipse.
VBA:
Sub Example_EndParameter() ' This example creates an ellipse and enters the start and ' end parameters to create an elliptical arc. Dim ellObj As AcadEllipse Dim majAxis(0 To 2) As Double Dim center(0 To 2) As Double Dim radRatio As Double ' 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 parameter of 1.57, and an end parameter of 6.28 ellObj.StartParameter = 1.57 ellObj.EndParameter = 6.28 ZoomAll ' Find the start and end parameters for the ellipse MsgBox "The ellipse has a start parameter of " & ellObj.StartParameter & " and an end parameter of " & ellObj.EndParameter, vbInformation, "EndParameter Example" End Sub
Visual LISP:
(vl-load-com) (defun c:Example_EndParameter() ;; This example creates an ellipse and enters the start and ;; end parameters to create an elliptical arc. (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 parameter of 1.57, and an end parameter of 6.28 (vla-put-StartParameter ellObj 1.57) (vla-put-EndParameter ellObj 6.28) (vla-ZoomAll acadObj) ;; Find the start and end parameters for the ellipse (alert (strcat "The ellipse has a start parameter of " (rtos (vla-get-StartParameter ellObj) 2) " and an end parameter of " (rtos (vla-get-EndParameter ellObj) 2))) )