draw_key_* functions used by the sketch geoms so their legends render with
the same hand-drawn character. Not called directly; passed as the draw_key
field of a geom (see ggplot2::draw_key).
draw_key_sketch_path(data, params, size)draw_key_sketch_medium(data, params, size)
draw_key_sketch_point(data, params, size)
draw_key_sketch_polygon(data, params, size)
A grid grob.
A single-row data frame of the key's aesthetics.
The layer's parameter list (roughness, seed, fill_style, ...).
Key size in mm (unused; kept for the draw_key contract).