r - how to attribute colors to factor levels in ggplot2

Question

usually I use +scale_color/fill_continuous(values=c("blue","red")) but here I need to do several plots where some levels does not change, so I wondered if there where a way to do something like :

+scale_color/fill_continuous(values=c("A":"blue","B":"red"))

The idea is to save to a level a specific color that will never change.

question from:https://stackoverflow.com/questions/65907276/how-to-attribute-colors-to-factor-levels-in-ggplot2

Answer 1

You might want to assign this before you plot the data.

E.g., make a column in your dataframe with the name of the color (or color value), and use dplyr::case_when to conditionally assign the color based on some condition.