scale_color_hdx_discrete {gghdx}

HDX color scales

Description

Color scales using the HDX palette. For discrete color scales, the scale_color_hdx_...() and scale_fill_hdx_...() family of functions are available. For gradient scales, use scale_color_gradient_hdx() and scale_fill_gradient_hdx() functions for a single color scale or scale_..._gradient2...() alternative.

Usage

scale_color_hdx_discrete(na.value = hdx_hex("gray-light"), ...)

scale_colour_hdx_discrete(na.value = hdx_hex("gray-light"), ...)

scale_color_hdx_gray(na.value = hdx_hex("tomato-hdx"), ...)

scale_colour_hdx_gray(na.value = hdx_hex("tomato-hdx"), ...)

scale_colour_hdx_grey(na.value = hdx_hex("tomato-hdx"), ...)

scale_color_hdx_grey(na.value = hdx_hex("tomato-hdx"), ...)

scale_color_hdx_mint(na.value = hdx_hex("gray-light"), ...)

scale_colour_hdx_mint(na.value = hdx_hex("gray-light"), ...)

scale_color_hdx_sapphire(na.value = hdx_hex("gray-light"), ...)

scale_colour_hdx_sapphire(na.value = hdx_hex("gray-light"), ...)

scale_color_hdx_tomato(na.value = hdx_hex("gray-light"), ...)

scale_colour_hdx_tomato(na.value = hdx_hex("gray-light"), ...)

scale_fill_hdx_discrete(na.value = hdx_hex("gray-light"), ...)

scale_fill_hdx_gray(na.value = hdx_hex("tomato-hdx"), ...)

scale_fill_hdx_grey(na.value = hdx_hex("tomato-hdx"), ...)

scale_fill_hdx_mint(na.value = hdx_hex("gray-light"), ...)

scale_fill_hdx_sapphire(na.value = hdx_hex("gray-light"), ...)

scale_fill_hdx_tomato(na.value = hdx_hex("gray-light"), ...)

scale_fill_gradient_hdx(na.value = "transparent", ...)

scale_fill_gradient_hdx_sapphire(na.value = "transparent", ...)

scale_fill_gradient_hdx_mint(na.value = "transparent", ...)

scale_fill_gradient_hdx_tomato(na.value = "transparent", ...)

scale_color_gradient_hdx(na.value = "transparent", ...)

scale_colour_gradient_hdx(na.value = "transparent", ...)

scale_color_gradient_hdx_sapphire(na.value = "transparent", ...)

scale_colour_gradient_hdx_sapphire(na.value = "transparent", ...)

scale_color_gradient_hdx_mint(na.value = "transparent", ...)

scale_colour_gradient_hdx_mint(na.value = "transparent", ...)

scale_color_gradient_hdx_tomato(na.value = "transparent", ...)

scale_colour_gradient_hdx_tomato(na.value = "transparent", ...)

scale_color_gradient2_hdx(na.value = "transparent", ...)

scale_colour_gradient2_hdx(na.value = "transparent", ...)

scale_fill_gradient2_hdx(na.value = "transparent", ...)

Arguments

na.value

Colour to use for missing values

...

Arguments passed on to discrete_scale

palette

A palette function that when called with a single integer argument (the number of levels in the scale) returns the values that they should take (e.g., scales::pal_hue()).

breaks

One of:

• NULL for no breaks

• waiver() for the default breaks (the scale limits)

• A character vector of breaks

• A function that takes the limits as input and returns breaks as output. Also accepts rlang lambda function notation.

limits

One of:

• NULL to use the default scale values

• A character vector that defines possible values of the scale and their order

• A function that accepts the existing (automatic) values and returns new ones. Also accepts rlang lambda function notation.

drop

Should unused factor levels be omitted from the scale? The default, TRUE, uses the levels that appear in the data; FALSE includes the levels in the factor. Please note that to display every level in a legend, the layer should use show.legend = TRUE.

na.translate

Unlike continuous scales, discrete scales can easily show missing values, and do so by default. If you want to remove missing values from a discrete scale, specify na.translate = FALSE.

labels

One of:

• NULL for no labels

• waiver() for the default labels computed by the transformation object

• A character vector giving labels (must be same length as breaks)

• An expression vector (must be the same length as breaks). See ?plotmath for details.

• A function that takes the breaks as input and returns labels as output. Also accepts rlang lambda function notation.

guide

A function used to create a guide or its name. See guides() for more information.

call

The call used to construct the scale for reporting messages.

super

The super class to use for the constructed scale

Value

Relevant ggplot2 scale object to add to a ggplot2::ggplot() plot, either ggplot2::ScaleDiscrete or ggplot2::ScaleContinuous.

See Also

gghdx() for setting default fill and color scaling, along with other styling.

Examples

library(ggplot2)

# discrete scaling
p1 <- ggplot(iris) +
  geom_point(
    aes(
      x = Sepal.Length,
      y = Petal.Width,
      color = Species
    )
  )

p1

p1 + scale_color_hdx_discrete()
p1 + scale_color_hdx_mint()

# use gradient scaling
p2 <- ggplot(iris) +
  geom_point(
    aes(
      x = Sepal.Length,
      y = Petal.Width,
      color = Petal.Length
    )
  )

p2

p2 + scale_color_gradient_hdx_mint()
p2 + scale_color_gradient_hdx_tomato()