scale_pattern_shape maps discrete variables to six easily discernible shapes.
If you have more than six levels, you will get a warning message, and the
seventh and subsequence levels will not appear on the plot. Use
scale_pattern_shape_manual() to supply your own values. You can not map
a continuous variable to shape unless scale_pattern_shape_binned() is used. Still,
as shape has no inherent order, this use is not advised..
scale_pattern_shape(..., solid = TRUE)scale_pattern_shape_discrete(..., solid = TRUE)
scale_pattern_shape_ordinal(...)
scale_pattern_shape_continuous(...)
other arguments passed to discrete_scale()
Should the shapes be solid, TRUE, or hollow,
FALSE?
Scales for area or radius