对于一个圆弧，启始角度和终止角度是怎么回事？？？（重谢）

[qingbo]

多谢！！！！

[webber84]

起始角度是以X轴为起点，向逆时针方向转过的角度，终止角度是以起始角度为起点，逆时针方向转过的角度

[Richuen22]

The actual starting point of the arc is the point at which a ray drawn from the center of the bounding rectangle through the specified starting point intersects the ellipse. The actual ending point of the arc is the point at which a ray drawn from the center of the bounding rectangle through the specified ending point intersects the ellipse

[mousubin]

用在什么地方？

[webber84]

BOOL AngleArc( int x, int y, int nRadius, float fStartAngle, float fSweepAngle );

[mousubin]

使用AngleArc画弧并不是一个好选择，虽然方便，当精度低，还是用ARC好