android画圆弧的方向,android 绘制弧线

Draw the specified arc, which will be scaled to fit inside the

specified oval.

If the start angle is negative or >= 360, the

start angle is treated as start angle modulo 360.

If the sweep angle is >= 360, then the oval is

drawn completely. Note that this differs slightly from

SkPath::arcTo, which treats the sweep angle modulo 360. If the

sweep angle is negative, the sweep angle is treated as sweep angle

modulo 360

The arc is drawn clockwise. An angle of 0 degrees correspond to

the geometric angle of 0 degrees (3 o'clock on a watch.)