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