Automatically select appropriate color scale

Automatically select appropriate color scale

which_pal_scale(
  mapping,
  palette = "ggplot2",
  data = NULL,
  fill_type = c("continuous", "discrete"),
  color_type = c("continuous", "discrete"),
  reverse = FALSE
)

Arguments

mapping

Aesthetics used in ggplot.

palette

Color palette.

data

An optional data.frame to choose the right type for variables.

fill_type, color_type

Scale to use according to the variable used in fill/color aesthetic : "discrete" or "continuous". Ignored if data is provided: it will be guessed from data.

reverse

Reverse colors order or not.

Value

a list

Examples

library(ggplot2)

# Automatic guess according to data
which_pal_scale(
  mapping = aes(fill = Sepal.Length), 
  palette = "ggplot2", 
  data = iris
)
#> $scales
#> [1] "scale_fill_gradient"
#> 
#> $args
#> list()
#> 
which_pal_scale(
  mapping = aes(fill = Species),
  palette = "ggplot2", 
  data = iris
)
#> $scales
#> [1] "scale_fill_hue"
#> 
#> $args
#> $args$scale_fill_hue
#> $args$scale_fill_hue$direction
#> [1] 1
#> 
#> 
#> 


# Explicitly specify type
which_pal_scale(
  mapping = aes(color = variable), 
  palette = "Blues", 
  color_type = "discrete"
)
#> $scales
#> [1] "scale_color_brewer"
#> 
#> $args
#> $args$scale_color_brewer
#> $args$scale_color_brewer$palette
#> [1] "Blues"
#> 
#> $args$scale_color_brewer$direction
#> [1] 1
#> 
#> 
#> 


# Both scales
which_pal_scale(
  mapping = aes(color = var1, fill = var2), 
  palette = "Blues", 
  color_type = "discrete",
  fill_type = "continuous"
)
#> $scales
#> [1] "scale_fill_distiller" "scale_color_brewer"  
#> 
#> $args
#> $args$scale_fill_distiller
#> $args$scale_fill_distiller$palette
#> [1] "Blues"
#> 
#> $args$scale_fill_distiller$direction
#> [1] 1
#> 
#> 
#> $args$scale_color_brewer
#> $args$scale_color_brewer$palette
#> [1] "Blues"
#> 
#> $args$scale_color_brewer$direction
#> [1] 1
#> 
#> 
#>