Description of the desired feature

Via the fill or similar parameters users can fill polygons with a pattern. @seisman mentioned in comment #2329 (comment), whether we should define a class for GMT patterns:

I wonder if we should define a class for GMT patterns, e.g.,

class GMTPattern:
   def __init__(self, id, reversed=False, bgcolor="white", fgcolor="black", dpi=1200):
       ...

Issues / PRs / gallery examples related to patterns:

• Issue Gallery example for histogram/plot showing bit and hachure patterns #2323
• PR Add a gallery example showing how to use patterns via the "fill" parameter (or similar parameters) #2329
  -> gallery example Bit and Hachure Patterns
• PR Expand histogram gallery example to show usage of pattern as fill #2421
  -> either expand of gallery example Histogram or separat gallery example
• PR Add gallery example to show usage of dcw parameter in Figure.coast #2428
  -> gallery example Highlight country polygons
  -> in case it is planed to also show how pattern can be used the comments up on Add a gallery example showing how to use patterns via the "fill" parameter (or similar parameters) #2329 (comment) may be helpful

Are you willing to help implement and maintain this feature?

No