prevR (version 3.4.0)

prevR.colors: Continuous color palettes.

Description

Functions generating color palettes useable with R graphical functions, in particular with spplot. These palettes are continuous, contrast being accentuated by darkening and lightening extrem 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)

prevR.colors.blue.inverse(n)

prevR.colors.gray(n)

prevR.colors.gray.inverse(n)

prevR.colors.green(n)

prevR.colors.green.inverse(n)

prevR.colors.red(n)

prevR.colors.red.inverse(n)

prevR.demo.pal(n, border = if (n < 32) "light gray" else NA, main = NULL)

prevR.colors.qgis.pal(file, at, pal = "red", inverse = FALSE)

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?

Value

prevR.demo.pal plot the color palettes.

prevR.colors.qgis.pal export a color palette in a texte file readable by Quantum GIS.

The other functions return a list of colors coded in hexadecimal.

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 rainbow{grDevices} or the package RColorBrewer.

Examples

Run this code
# NOT RUN {
prevR.demo.pal(25)
prevR.colors.red(5)
col2rgb(prevR.colors.red(5))

# }
# NOT RUN {
 prevR.colors.qgis.pal('palette.txt', seq(0,25,length.out=100), 'red')
# }
# NOT RUN {
# }

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