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Dear Yanhua,

In 2007 there is a new method, SketchEllipse::GetRotationDir, to get the direction. If you're using 2006 or later, the information below may help:

The direction of an arc is usually defined by looking in the opposite direction along this normal, going in a CCW direction from start to end point.

> Suppose, we have an arc with start angle 10 degree and end angle = 100 degree.
> Now for this arc if the direction is Counter clock wise then Arc angle
> is 90 degree and if the arc is clockwise the arc angle is 270 degree.

Regards,
Robin Richter

__________________
借用达朗贝尔的名言：前进吧，你会得到信心!
[url="http://www.dimcax.com"]几何尺寸与公差标准[/url]

2007-09-04, 12:03 AM	#3
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	回复: How to get the direction of ellipse? Dear Yanhua, In 2007 there is a new method, SketchEllipse::GetRotationDir, to get the direction. If you're using 2006 or later, the information below may help: The direction of an arc is usually defined by looking in the opposite direction along this normal, going in a CCW direction from start to end point. > Suppose, we have an arc with start angle 10 degree and end angle = 100 degree. > Now for this arc if the direction is Counter clock wise then Arc angle > is 90 degree and if the arc is clockwise the arc angle is 270 degree. Regards, Robin Richter __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]