(PECL imagick 2.0.0)
ImagickDraw::arc — Draws an arc
本函数还未编写文档，仅有参数列表。
Draws an arc falling within a specified bounding rectangle on the image.
Starting x ordinate of bounding rectangle
starting y ordinate of bounding rectangle
ending x ordinate of bounding rectangle
ending y ordinate of bounding rectangle
starting degrees of rotation
ending degrees of rotation
没有返回值。