https://github.com/marcmenem/ggshadow
GitHub - marcmenem/ggshadow: A collection of geoms for R's 'ggplot2' library. geom_shadowpath(),...
A collection of geoms for R's 'ggplot2' library. geom_shadowpath(), geom_shadowline(), geom_shadowstep() and geom_shadowpoint() functions draw a shadow below...