Preview Palettes and Hex Values

Source: R/bi_pal.R

Prints either a visual preview of each palette or the associated hex values.

bi_pal(pal, dim = 3, preview = TRUE, flip_axes = FALSE, rotate_pal = FALSE)

Arguments

pal

A palette name or a vector containing a custom palette. If you are providing a palette name, it must be one of: "Bluegill", "BlueGold", "BlueOr", "BlueYl", "Brown"/"Brown2", "DkBlue"/"DkBlue2", "DkCyan"/"DkCyan2", "DkViolet"/"DkViolet2", "GrPink"/"GrPink2", "PinkGrn", "PurpleGrn", or "PurpleOr".

Pairs of palettes, such as "GrPink"/"GrPink2", are included for legacy support. The numbered palettes support four-by-four bivarite maps while the un-numbered ones, which were the five included in the original release of the package, only support two-by-two and three-by-three maps.

If you are providing a custom palette, it must follow the formatting described in the 'Advanced Options' vignette.

dim

The dimensions of the palette. To use the built-in palettes, this value must be either 2, 3, or 4. A value of 3, for example, would be used to create a three-by-three bivariate map with a total of 9 classes.

If you are using a custom palette, this value may be larger (though these maps can be very hard to interpret). See the 'Advanced Options' vignette for details on the relationship between dim values and palette size.

preview

A logical scalar; if TRUE (default), an image preview will be generated. If FALSE, a vector with hex color values will be returned.

flip_axes

A logical scalar; if TRUE the axes of the palette will be flipped. If FALSE (default), the palette will be displayed on its original axes. Custom palettes with 'dim' greater than 4 cannot take advantage of flipping axes.

rotate_pal

A logical scalar; if TRUE the palette will be rotated 180 degrees. If FALSE (default), the palette will be displayed in its original orientation. Custom palettes with 'dim' greater than 4 cannot take advantage of palette rotation.

Value

If preview = TRUE, an image preview of the legend will be returned. Otherwise, if preview = FALSE, a named vector with class values for names and their corresponding hex color values.

Details

The "Brown", "DkBlue", "DkCyan", and "GrPink" palettes were made by Joshua Stevens. The "DkViolet" palette was made by Timo Grossenbacher and Angelo Zehr. Many of the new palettes were inspired by Branson Fox's earlier work to expand biscale.

Examples

# gray pink palette, 2x2
bi_pal(pal = "GrPink", dim = 2)


# gray pink palette, 2x2 hex values
bi_pal(pal = "GrPink", dim = 2, preview = FALSE)
#>       1-1       2-1       1-2       2-2 
#> "#e8e8e8" "#c85a5a" "#64acbe" "#574249" 

# gray pink palette, 3x3
bi_pal(pal = "GrPink", dim = 3)


# gray pink palette, 3x3 hex values
bi_pal(pal = "GrPink", dim = 3, preview = FALSE)
#>       1-1       2-1       3-1       1-2       2-2       3-2       1-3       2-3 
#> "#e8e8e8" "#e4acac" "#c85a5a" "#b0d5df" "#ad9ea5" "#985356" "#64acbe" "#627f8c" 
#>       3-3 
#> "#574249" 

# custom palette
custom_pal <- c(
    "1-1" = "#cabed0", # low x, low y
    "2-1" = "#ae3a4e", # high x, low y
    "1-2" = "#4885c1", # low x, high y
    "2-2" = "#3f2949" # high x, high y
)

bi_pal(pal = custom_pal, dim = 2, preview = FALSE)
#>       1-1       2-1       1-2       2-2 
#> "#cabed0" "#ae3a4e" "#4885c1" "#3f2949"