(PECL imagick 2.0.0)
Creating a parallelogram
bool Imagick::shearImage ( mixed $background, float $x_shear, float $y_shear )
Slides one edge of an image along the X or Y axis, creating a parallelogram. An X direction shear slides an edge along the X axis, while a Y direction shear slides an edge along the Y axis. The amount of the shear is controlled by a shear angle. For X direction shears, x_shear is measured relative to t