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