`r lifecycle::badge("deprecated")`
This function was deprecated because unicode glyphs used for the circles vary in size, making them unusable for plotting.
Shape palette with circles varying by amount of fill. This uses the set of 3 circle fill values in Lewandowsky and Spence (1989): solid, hollow, half-filled, with two additional fill amounts: three-quarters, and one-quarter.
This palette supports up to five values.
References
Lewandowsky, Stephan and Ian Spence (1989) "Discriminating Strata in Scatterplots", Journal of the American Statistical Association, https://www.jstor.org/stable/2289649
See also
Other shapes:
cleveland_shape_pal(),
scale_shape_circlefill(),
scale_shape_cleveland(),
scale_shape_tremmel(),
tremmel_shape_pal()