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Last data update: 2014.03.03

R: Sequential color palette using the cube helix system

cube.helix

R Documentation

Sequential color palette using the cube helix system

Description

Creates a perceptually monotonously decreasing (or increasing) lightness color palette with different tones.

Usage

cube.helix(n = 6, start = 0, r = 0.4, hue = 0.8, gamma = 1,
  light = 0.85, dark = 0.15, reverse = FALSE)

Arguments

`n`	Number of colors to return (default: 6)
`start`	Hue to start helix at (\textrm{start} in [0,3], default: 0)
`r`	Number of rotations of the helix. Can be negative. (default: 0.4)
`hue`	Saturation. 0 means greyscale, 1 fully saturated colors (default: 0.8)
`gamma`	Emphasize darker (gamma < 1) or lighter (gamma > 1) colors (default: 1)
`light`	Lightest lightness (default: 0.85)
`dark`	Darkest lightness (default: 0.15)
`reverse`	logical. If TRUE, reverse lightness (default: FALSE)

Value

A character vector of hex colors with length n

Examples

palette(cube.helix())
image(matrix(1:6), col = 1:6, pch = 19, axes = FALSE)

cr <- colorRamp(cube.helix(12, r = 3))
r <- runif(100)
plot(1:100, r, col = rgb(cr(r), max = 255), type = 'b', pch = 20)

Results


R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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Platform: x86_64-pc-linux-gnu (64-bit)

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> library(destiny)
Loading required package: Biobase
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package: 'BiocGenerics'

The following objects are masked from 'package:parallel':

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
    clusterExport, clusterMap, parApply, parCapply, parLapply,
    parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked from 'package:stats':

    IQR, mad, xtabs

The following objects are masked from 'package:base':

    Filter, Find, Map, Position, Reduce, anyDuplicated, append,
    as.data.frame, cbind, colnames, do.call, duplicated, eval, evalq,
    get, grep, grepl, intersect, is.unsorted, lapply, lengths, mapply,
    match, mget, order, paste, pmax, pmax.int, pmin, pmin.int, rank,
    rbind, rownames, sapply, setdiff, sort, table, tapply, union,
    unique, unsplit

Welcome to Bioconductor

    Vignettes contain introductory material; view with
    'browseVignettes()'. To cite Bioconductor, see
    'citation("Biobase")', and for packages 'citation("pkgname")'.

> png(filename="/home/ddbj/snapshot/RGM3/R_BC/result/destiny/cube.helix.Rd_%03d_medium.png", width=480, height=480)
> ### Name: cube.helix
> ### Title: Sequential color palette using the cube helix system
> ### Aliases: cube.helix
> 
> ### ** Examples
> 
> palette(cube.helix())
> image(matrix(1:6), col = 1:6, pch = 19, axes = FALSE)
> 
> cr <- colorRamp(cube.helix(12, r = 3))
> r <- runif(100)
> plot(1:100, r, col = rgb(cr(r), max = 255), type = 'b', pch = 20)
> 
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>