Allow clipping path grobs (as well as 'boundary_dfs') in 'create_pattern_grobs()'

trevorld / ggpattern

ggplot geoms with pattern fills

https://trevorldavis.com/R/ggpattern/dev/

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Closed trevorld closed 3 years ago

trevorld commented 3 years ago

If 'is_boundary_df()' do existing clipping behaviour behaviour (usually with {sf} or existing "array" clipping)
If 'is.grob()' then use it as a clipping path grob using new gridpattern::clippingPathGrob() function
- If getOption("ggpattern_use_R4.1_clipping") we simply use new R 4.1 grid clipping path feature
- Otherwise we generate a rasterGrob approximation
This should make it much easier to support pattern geoms with holes.

trevorld commented 3 years ago

Would need to use grobPoints() to compute an appropriate boundary_df for the array-based patterns (to properly "zoom" in the pictures)