carto.pal: Build Cartographic Palettes

In cartography: Thematic Cartography

Build Cartographic Palettes

Description

carto.pal builds sequential, diverging and qualitative color palettes. Diverging color palettes can be dissymmetric (different number of colors in each of the two gradients).

carto.pal.info displays the names of all color palettes.

display.carto.pal displays one color palette.

display.carto.all displays all the available color palettes.

Usage

carto.pal(
  pal1,
  n1,
  pal2 = NULL,
  n2 = NULL,
  middle = FALSE,
  transparency = FALSE
)

carto.pal.info()

display.carto.pal(name)

display.carto.all(n = 10)

Arguments

pal1	name of the color gradient (see Details).
n1	number of colors (up to 20).
pal2	name of the color gradient (see Details).
n2	number of colors (up to 20).
middle	a logical value. If TRUE, a neutral color ("#F6F6F6", light grey) between two gradients is added.
transparency	a logical value. If TRUE, contrasts are enhanced by adding an opacity variation.
name	name of the palette available in the package (see Details).
n	number of colors in the gradient (up to 20).

Details

Sequential palettes: "blue.pal", "orange.pal", "red.pal", "brown.pal", "green.pal", "purple.pal", "pink.pal", "wine.pal", "grey.pal", "turquoise.pal", "sand.pal", "taupe.pal", "kaki.pal" or "harmo.pal".

Qualitative palettes: "pastel.pal" or "multi.pal".

Value

carto.pal returns a vector of colors.

carto.pal.info returns a vector of color palettes names.

References

Qualitative palettes were generated with "i want hue" (https://medialab.github.io/iwanthue/) by Mathieu Jacomy at the Sciences-Po Medialab.

Examples

# Simple gradient: blue
carto.pal(pal1 = "blue.pal" ,n1 = 20)

# Double gradient: blue & red
carto.pal(pal1 = "blue.pal", n1 = 10, pal2 = "red.pal", n2 = 10)

# Adding a neutral color
carto.pal(pal1 = "blue.pal", n1 = 10, pal2 = "red.pal", n2 = 10, middle = TRUE)

# Enhancing contrasts with transparency
carto.pal(pal1="blue.pal", n1 = 10, pal2 = "red.pal", n2 = 10, middle = TRUE,
          transparency = TRUE)

# The double gradient can be asymetric
carto.pal(pal1 = "blue.pal", n1 = 5, pal2 = "red.pal", n2 = 15, middle = TRUE,
          transparency = TRUE)

# Build and display a palette
mypal <- carto.pal(pal1 = "blue.pal", n1 = 5, pal2 = "red.pal", n2 = 15,
                   middle = TRUE, transparency = TRUE)
k <- length(mypal)
image(1:k, 1, as.matrix(1:k), col =mypal, xlab = paste(k," classes",sep=""),
      ylab = "", xaxt = "n", yaxt = "n",bty = "n")
carto.pal.info()
display.carto.pal("orange.pal")
display.carto.all(8)

cartography documentation built on Sept. 14, 2023, 5:08 p.m.