(PECL imagick 2 >= 2.2.0, PECL imagick 3)
Imagick::setGravity — Sets the gravity
$gravity
Sets the global gravity property for the Imagick object. 此方法在Imagick基于ImageMagick 6.4.0以上版本编译时可用。
gravity
The gravity property. Refer to the list of gravity constants.
没有返回值。