GRAVITY_NORTHWEST: 1
GRAVITY_NORTH: 2
GRAVITY_NORTHEAST: 3
GRAVITY_WEST: 4
GRAVITY_CENTER: 5
GRAVITY_EAST: 6
GRAVITY_SOUTHWEST: 7
GRAVITY_SOUTH: 8
GRAVITY_SOUTHEAST: 9
Default is: 0
(PECL imagick 2 >= 2.2.0, PECL imagick 3)
Imagick::setGravity — Sets the 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。
没有返回值。