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# Functions to define/extract compact colour specifications
#
# Author: "Renaud Gaujoux"
# Creation: 19 Sep 2011
###############################################################################
#' @import RColorBrewer
#' @importFrom colorspace sequential_hcl
#' @import grDevices
NULL
col2hex <- function (cname)
{
colMat <- col2rgb(cname)
rgb(red = colMat[1, ]/255, green = colMat[2, ]/255, blue = colMat[3,]/255)
}
#cc <- function(x, cval=80, lval=30){
#
# sapply(x, function(co){
# if( is.integer(co) ) col2hex(if( co <= 8 ) co else colors()[co])
# else if( is.numeric(co) ) hcl(co, c=cval, l=lval)
# else if( !grepl("^#") )
# else co
# })
#
#}
#' Flags a Color Palette Specification for Reversion
#' @keywords internal
revPalette <- function(x){
attr(x, 'revPalette') <- TRUE
x
}
#' Builds a Color Palette from Compact Color Specification
#' @keywords internal
ccPalette <- function(x, n=NA, verbose=FALSE){
if( length(x)==1 ){
# shortcut for single colors
if( (is_NA(n) || n==1) && length(x) > 1L && all(grepl("^#", x)) ) return(x)
sp <- ccSpec(x)
x <- sp$palette
if( is_NA(n) )
n <- sp$n
a <- attributes(x)
if( is.integer(x) ) # integer code between 1 and 8: R basic colour
x <- c("#F1F1F1", col2hex(x))
else if( is.numeric(x) ) # numeric: hcl colour
x <- rev(sequential_hcl(2, h = x, l = c(50, 95)))
else if( is.character(x) ){ # Palette name:
if( require.quiet('RColorBrewer') && x %in% rownames(brewer.pal.info) ){
if( verbose ) message("Load and generate ramp from RColorBrewer colour palette '", x, "'")
x <- brewer.pal(brewer.pal.info[x, 'maxcolors'], x)
}else{
cpal <- c('RdYlBu2', 'rainbow', 'heat', 'topo', 'terrain', 'cm', 'gray', 'grey')
i <- pmatch(x, cpal)
if( is.na(i) && (x %in% colours() || grepl("^#[0-9a-fA-F]+$", x)) ){
x <- c("#F1F1F1", x)
}else{
if( is.na(i) ){
stop("Invalid palette name '", x, "': should be an RColorBrewer palette or one of "
, paste("'", cpal ,"'", sep='', collapse=', ')
, ".\n Available RColorBrewer palettes: ", str_out(rownames(brewer.pal.info), Inf), '.')
}
x <- cpal[i]
# use default value of 10 for n if not specified
np <- if( is_NA(n) ) 10 else n
x <- switch(x
, RdYlBu2 = c("#D73027", "#FC8D59", "#FEE090", "#FFFFBF", "#E0F3F8", "#91BFDB", "#4575B4")
, rainbow = rainbow(np)
, gray = rev(gray.colors(np))
, grey = rev(grey.colors(np))
, heat = heat.colors(np)
, topo = topo.colors(np)
, terrain = terrain.colors(np)
, cm = cm.colors(np)
, stop("Unknown colour palette name: '", x, "'")
)
}
}
}
else
stop("Invalid colour palette specification :", x)
attributes(x) <- a
}
# revert the palette if requested
if( !is.null(attr(x, 'revPalette')) ){
x <- rev(x)
attr(x, 'revPalette') <- NULL
}
# limit to the requested length
if( !is_NA(n) )
x <- x[1:n]
# return converted palette
x
}
#' Generate Break Intervals from Numeric Variables
#'
#' Implementation is borrowed from the R core function \code{\link{cut.default}}.
#'
#' @keywords internal
ccBreaks <- function(x, breaks){
if (!is.numeric(x))
stop("'x' must be numeric")
if (length(breaks) == 1L) {
if (is.na(breaks) | breaks < 2L)
stop("Invalid number of intervals: should be >= 2")
nb <- as.integer(breaks + 1)
dx <- diff(rx <- range(x, na.rm = TRUE))
if (dx == 0)
dx <- abs(rx[1L])
breaks <- seq.int(rx[1L] - dx/1000, rx[2L] + dx/1000,
length.out = nb)
}
else nb <- length(breaks <- sort.int(as.double(breaks)))
if (anyDuplicated(breaks))
stop("'breaks' are not unique")
breaks
}
#' Extract Colour Palette Specification
#'
#' @param a character string that specify a colour palette.
#' @return a list with elements: palette, n and rev
#'
#' @keywords internal
ccSpec <- function(x){
n <- NA
rv <- FALSE
if( length(x) == 1 ){
if( is.character(x) ){
# flag as reversed if it starts with a '-'
if( grepl('^-', x) ){
x <- substr(x, 2, nchar(x))
rv <- TRUE
}
# extract length for string
sm <- str_match(x, "([^:]+):([0-9]+).*")[1,]
if( !is_NA(sm[1]) ){
n <- as.integer(sm[3])
x <- sm[2]
}
# convert to a colour code if possible
# use maximum colour number of brewer sets
if( is_NA(n) && isString(x) && require.quiet('RColorBrewer') && x %in% rownames(brewer.pal.info) ){
n <- brewer.pal.info[x,'maxcolors']
}else if( grepl("^[1-8]$", x) ){# integer code between 1 and 8: R basic colour
x <- palette()[as.integer(x)]
}else if( grepl("^[0-9.]+$", x) ) # numeric: hcl colour
x <- as.numeric(x)
}else if( is.numeric(x) ){
if( x < 0 ){
x <- -x
rv<- TRUE
}
# single integer specification: use R default colours
if( isInteger(x) ){
if( x <= 8 ) x <- palette()[x]
else x <- colours()[x]
}
}
}
if( rv )
x <- revPalette(x)
res <- list(palette=x, n=n, rev=rv)
# print(res)
res
}
#' Builds a Color Ramp from Compact Color Specification
#'
#' @keywords internal
ccRamp <- function(x, n=NA, ...){ #breaks, data, ...){
# generate random color specification if necessary
if( missing(x) )
x <- round(runif(1) * 360)
# extract specifications
sp <- ccSpec(x)
x <- sp$palette
if( missing(n) ){
n <- sp$n
if( is_NA(n) ) n <- 50
}
# create a palette from specification x
x <- ccPalette(x, ...)
# # compute breaks
# breaks <-
# if( !missing(breaks) ){
# breaks <- ccBreaks(x, breaks)
# if( missing(n) )
# n <- length(breaks)
# breaks
# }
# else if( !missing(data) ){
# if( missing(n) )
# n <- length(x)
# ccBreaks(data, n)
# }
if( is_NA(n) )
n <- length(x)
# return ramp from palette
colorRampPalette(x)(n+1)
}
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