ggplot2: piecharts instead of points in an xy scatterplot

Question

I have a four-dimensional dataset, let\'s call the variables x, y, z and r. There is at most one entry for each combination of x and y. Currently, I have a scatterplot where

Answer 1

You can use ggforce to realize the function, but someone has already done this for you, and created another R package called scatterpie, you can find it here