testCol function

Display Colours Available Using a Set of Strings

Display colours as round patches in a plot. Useful for programming purposes. Colours can be specified in any of 3 different ways:

(i) by colour name,

(ii) by hexadecimal colour code created by rgb(), or

(iii) by calling one of the colour palettes.

testCol(cnam=colors()[sample(length(colors()),15)])

Arguments

• cnam: character -- vector of colour names to display. Defaults to 15 random names from the color palette to use as patterns.

Author(s)

Rowan Haigh, Program Head -- Offshore Rockfish

Pacific Biological Station (PBS), Fisheries & Oceans Canada (DFO), Nanaimo BC

locus opus: Offsite, Vancouver BC

Last modified Rd: 2023-10-18

See Also

In package PBSmodelling:

pickCol, testAlpha

In package PBStools:

testPch

In package grDevices:

palettes

Examples

local(envir=.PBSmodEnv,expr={
  # mix and match patterns
  testCol(c("sky","fire","sea","wood"))
})
local(envir=.PBSmodEnv,expr={
  # display transparencies of blue
  testCol(rgb(0,0,1,seq(0.05,1,0.05)))
})
local(envir=.PBSmodEnv,expr={
  # display colours of the rainbow
  testCol(rainbow(64,end=0.75))
})
local(envir=.PBSmodEnv,expr={
  # display basic palette colours
  testCol(1:length(palette()))
})
local(envir=.PBSmodEnv,expr={
  # mix colour types
  testCol(c("#9e7ad3", "purple", 6))
})