bpy.colors: blue-pink-yellow color scheme, which also prints well on...

In sp: Classes and Methods for Spatial Data

blue-pink-yellow color scheme, which also prints well on black/white printers

Description

Create a vector of ‘n’ “contiguous” colors.

Usage

 bpy.colors(n = 100, cutoff.tails = 0.1, alpha = 1.0) 

Arguments

n	number of colors (>= 1) to be in the palette
cutoff.tails	tail fraction to be cut off on each side. If 0, this palette runs from black to white; by cutting off the tails, it runs from blue to yellow, which looks nicer.
alpha	numeric; alpha transparency, 0 is fully transparent, 1 is opaque.

Value

A character vector, ‘cv’, of color names. This can be used either to create a user-defined color palette for subsequent graphics by ‘palette(cv)’, a ‘col=’ specification in graphics functions or in ‘par’.

Note

This color map prints well on black-and-white printers.

Author(s)

unknown; the pallette was posted to gnuplot-info a few decades ago; R implementation Edzer Pebesma, [e-mail]

See Also

rainbow, cm.colors

Examples

bpy.colors(10)
p <- expand.grid(x=1:30,y=1:30)
p$z <- p$x + p$y
coordinates(p) <- c("x", "y")
gridded(p) <- TRUE
image(p, col = bpy.colors(100), asp = 1)
# require(lattice)
# trellis.par.set("regions", list(col=bpy.colors())) # make this default pallette

sp documentation built on Nov. 27, 2023, 1:08 a.m.