Derive a legible colour by contrasting against fill — aes

Note: this sets colour, not fill — fill is the value it reads from, colour is what it derives. Maps colour to a dark or light shade chosen for contrast against the layer's fill aesthetic, evaluated after scale training via ggplot2::after_scale(). Attaches no scale itself — sits downstream of whatever fill scale you've already applied.

Usage

aes_colourcontrast(dark = NULL, light = NULL, ...)

Arguments

dark: A dark colour string or hex value. If NULL, derived from the active theme.
light: A light colour string or hex value. If NULL, derived from the active theme.
...: Unused. Included to support trailing commas.

Value

A ggplot2 mapping object (as returned by ggplot2::aes()).