cartography (version 1.4.1)

carto.pal: Build Cartographic Palettes

Description

Build sequantial, diverging and qualitative color palettes. Diververging color palettes can be dissymetric (different number of colors in each of the two gradients).

Usage

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

Arguments

pal1

name of the color gradiant (see Details).

n1

number of colors (up to 20)

pal2

name of the color gradiant (see Details).

n2

number of colors (up to 20)

middle

a logical value. If TRUE, a neutral color ("#F6F6F6", almost white) between two gradients is added.

transparency

a logical value. If TRUE, contrasts are enhenced by adding an opacity variation.

Value

A vector of colors is returned.

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
• harmo.pal

Qualitative palettes:

• pastel.pal
• multi.pal

References

Qualitative palettes were generated with "i want hue" (http://tools.medialab.sciences-po.fr/iwanthue/) by Mathieu Jacomy at the Sciences-Po Medialab.

See Also

display.carto.pal, display.carto.all, carto.pal.info

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")