pangoGravityToRotation: pangoGravityToRotation
Description
Converts a PangoGravity value to its natural rotation in radians.
gravity should not be PANGO_GRAVITY_AUTO.Usage
pangoGravityToRotation(base.gravity)
Details
Note that pangoMatrixRotate takes angle in degrees, not radians.
So, to call pangoMatrixRotate with the output of this function
you should multiply it by (180. / G_PI).
Since 1.16