I've refactored hatching support to move the hatch design itself to the core, added support for them in the Agg and SVG backends, and simplified their usage in the PDF and PS backends. It should now be easier to add new hatch styles if anyone ever feels artistic.
In order to use the same general approach in all backends, the PS backend now uses the makepattern command rather than a loop to draw each hatch line. That may be a regression in certain situations (eg., old PS printers without enough memory). So those who were using the old PS backend with hatches should test the new approach and report any problems.
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA