Functions generating color palettes usable with R graphical functions.
These palettes are continuous, contrast being accentuated by darkening
and lightening extreme values. prevR.demo.pal plot the available
palettes. prevR.colors.qgis.pal export a palette in a text file
readable by Quantum GIS, an open-source mapping software.
Usage
prevR.colors.blue(n = 10)
prevR.colors.blue.inverse(n = 10)
prevR.colors.gray(n = 10)
prevR.colors.gray.inverse(n = 10)
prevR.colors.green(n = 10)
prevR.colors.green.inverse(n = 10)
prevR.colors.red(n = 10)
prevR.colors.red.inverse(n = 10)
prevR.demo.pal(n, border = if (n < 32) "light gray" else NA, main = NULL)
prevR.colors.qgis.pal(file, at, pal = "red", inverse = FALSE)
Value
prevR.demo.pal() plot the color palettes.
prevR.colors.qgis.pal() export a color palette in a text file readable
by Quantum GIS.
The other functions return a list of colors coded in hexadecimal.
Arguments
n
number of different colors in the palette.
border
border color.
main
title.
file
file name with extension.
at
list of values of the palette.
pal
color palette to use ("red", "green", "blue" or "gray").
inverse
use the inverse palette?
Details
prevR.colors.red() produces a color gradation from white/yellow
to red/dark red.
prevR.colors.blue() produces a color gradation from light blue
to dark blue.
prevR.colors.green() produces a color gradation from light green
to dark green.
prevR.colors.gray() produces a color gradation from white/light gray to
dark gray/black.
Functions with a suffix .inverse produce the same color gradation,
but from dark colors to light ones.
See Also
Other color palettes are available in R. See for example
grDevices::rainbow() or the package RColorBrewer.