ps_shading_pattern -- Creates a pattern based on a shading
( resource psdoc, int shadingid, string optlist )
Creates a pattern based on a shading, which has to be created before with
ps_shading(). Shading patterns can be used like regular
Resource identifier of the postscript file
as returned by ps_new().
The identifier of a shading previously created with
This argument is not currently used.
The identifier of the pattern or FALSE in case of an error.