(PECL gmagick >= Unknown)
Gmagick::swirlimage — Swirls the pixels about the center of the image
Swirls the pixels about the center of the image, where degrees indicates the sweep of the arc through which each pixel is moved. You get a more dramatic effect as the degrees move from 1 to 360.
degreesDefine the tightness of the swirling effect.
The Gmagick object on success
错误时抛出 GmagickException。