knitr::opts_chunk$set( collapse = TRUE, comment = "#>", fig.path = "man/figures/README-" )
Rethinking layers in ggplot2, written by Claus O. Wilke
devtools::install_github("clauswilke/relayer")
This is an experimental package. Use at your own risk. API is not stable. No user support provided.
Load required packages:
library(ggplot2) # version 2.3.0 required library(dplyr) library(relayer)
Make a layer with its own fill scale:
df1 <- data.frame(x = c(1, 2, 3)) ggplot(df1, aes(x = x)) + geom_tile(aes(fill = x, y = 2)) + geom_tile(aes(fill2 = x, y = 1)) %>% rename_geom_aes(new_aes = c("fill" = "fill2")) + scale_colour_viridis_c(aesthetics = "fill", guide = "legend", name = "viridis A", option = "A") + scale_colour_viridis_c(aesthetics = "fill2", guide = "legend", name = "viridis D")
Make several layers with their own color scales:
# make color scale shortcut scale_distiller <- function(aesthetics, palette, name, ...) { scale_colour_distiller( aesthetics = aesthetics, palette = palette, name = name, ..., guide = guide_legend(order = palette)) } # subset data iris_setosa <- filter(iris, Species == "setosa") iris_versicolor <- filter(iris, Species == "versicolor") iris_virginica <- filter(iris, Species == "virginica") # plot ggplot(mapping = aes(Sepal.Length, Sepal.Width)) + (geom_point(data = iris_setosa, aes(colour1 = Sepal.Width)) %>% rename_geom_aes(new_aes = c("colour" = "colour1"))) + (geom_point(data = iris_versicolor, aes(colour2 = Sepal.Width)) %>% rename_geom_aes(new_aes = c("colour" = "colour2"))) + (geom_point(data = iris_virginica, aes(colour3 = Sepal.Width)) %>% rename_geom_aes(new_aes = c("colour" = "colour3"))) + facet_wrap(~Species) + scale_distiller("colour1", 5, "setosa") + scale_distiller("colour2", 6, "versicolor") + scale_distiller("colour3", 7, "virginica") + theme_bw() + theme(legend.position = "bottom")
Use multiple color scales within a single layer. Note the difference to the previous example: Now the three color scales are jointly trained to the union of the data values.
ggplot(iris, aes(Sepal.Length, Sepal.Width)) + geom_point(aes(col1 = Sepal.Width, col2 = Sepal.Width, col3 = Sepal.Width, group = Species)) %>% rename_geom_aes( new_aes = c("colour" = "col1", "colour" = "col2", "colour" = "col3"), aes(colour = case_when(group == 1 ~ col1, group == 2 ~ col2, TRUE ~ col3)) ) + facet_wrap(~Species) + scale_distiller("col1", 5, "setosa") + scale_distiller("col2", 6, "versicolor") + scale_distiller("col3", 7, "virginica") + theme_bw() + theme(legend.position = "bottom", legend.key.width = grid::unit(6, "pt"))
Swap colour
and fill
aesthetics in a geom:
ggplot(iris, aes(Sepal.Length, fill = Species)) + geom_density(colour = "gray70", size = 2, alpha = 0.7) %>% rename_geom_aes(new_aes = c("fill" = "colour", "colour" = "fill"))
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