Color Scales for ggplot2 Graphics based on Color Themes

scale_color_theme() and family functions returns color scales for the "colour" and "fill" aesthetics of ggplot objects.

Usage

scale_color_theme(
  theme,
  ...,
  discrete = NULL,
  middle = 0,
  aesthetics = "colour"
)

scale_colour_theme(
  theme,
  ...,
  discrete = NULL,
  middle = 0,
  aesthetics = "colour"
)

scale_fill_theme(theme, ..., discrete = NULL, middle = 0, aesthetics = "fill")

Arguments

theme

one of the following: a color theme name such as "Viridis", a character vector of color names, a palette function, or a ramp function to be used to create a color theme.

...

optional arguments to be passed to ggplot2::continuous_scale() or ggplot2::discrete_scale().

discrete

logical. If TRUE, a discrete scale is returned.

middle

a numeric value specifying the middle point for the diverging color themes.

aesthetics

character string: "fill" or "color".

Value

scale_color_theme() returns a "ScaleContinuous" or "ScaleDiscrete" object that can be added to a "ggplot" object.

Examples

data(txhousing, package = "ggplot2")
cities <- c("Houston", "Fort Worth", "San Antonio", "Dallas", "Austin")
df <- subset(txhousing, city %in% cities)
d <- ggplot2::ggplot(data = df, ggplot2::aes(x = sales, y = median)) +
  ggplot2::geom_point(ggplot2::aes(colour = city))
d + scale_color_theme("Set 1")

d + scale_color_theme("R3")

d + scale_color_theme("Blues", discrete = TRUE)

d + scale_color_theme("SunsetDark", discrete = TRUE)

data(faithfuld, package = "ggplot2")
v <- ggplot2::ggplot(faithfuld) +
  ggplot2::geom_tile(ggplot2::aes(waiting, eruptions, fill = density))
v + scale_fill_theme("Plasma")

v + scale_fill_theme("Spectral")

v + scale_fill_theme("Spectral_r")

v + scale_fill_theme("midr", middle = 0.017)