急急求助~~ 还望各位大侠们多多指导~~

grassdds

我画了一个圆弧

想更改它的起始端点与中止端点

查找圆弧的属性时，表明它的起始端点与中止端点分别为StartPoint  与EndPoint，而且是可编辑的

可是 为什么我一对它赋值，他就出现错误

而且这种错误也只在我要给点赋值时才出现，像  我对它的圆心赋值也出现错误，但是我对  它的起始角度赋值时就没错

求助~~~~   我要怎样对一个点赋值呢？？？

songzhi

Specifies the start point for the arc, line, or ellipse.

MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/startpoint_see_also.htm" target="_blank" >See Also | MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/ex_startpoint.htm" target="_blank" >Example

Signature

object.StartPoint

object

MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_arc_object.htm" target="_blank" >Arc, MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_ellipse_object.htm" target="_blank" >Ellipse, MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_line_object.htm" target="_blank" >Line
The object or objects this property applies to.

StartPoint

Variant (three-element array of doubles);
For the Arc and Ellipse objects this property is read-only.
For the Line object this property is read-write.
The 3D WCS coordinate representing the start point for the object.

Remarks

The start point for an arc, ellipse, and line

[U]You cannot change the start point of an arc or ellipse[/U]. To edit an arc, use the MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_endangle.htm" target="_blank" >EndAngle and MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_radius.htm" target="_blank" >Radius properties. To edit an ellipse, use the EndAngle, MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_majoraxis.htm" target="_blank" >MajorAxis, and MSITStore:D:\Program%20Files\AutoCAD%202004\help\acadauto.chm::/idh_radiusratio.htm" target="_blank" >RadiusRatio properties.

所以说是可编辑的是错误的

Ea

把点转换为对应的角度-〉修改角度