GeneralCode/palettes.R at master · IFenton/GeneralCode · GitHub

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## Created 10 / 01 / 2014
## Isabel Fenton
##
## Contains a range of methods for plotting colours
## a lot of this is based on colours.R
##
## functions:
## percent.col - fill a certain percentage with a given colour
## heat.sat - palette
## heat.v - palette
## log.heat - palette
## rev.log.heat - palette
## water.colors - palette
## rwb - palette
## rwbt - palette
## rainbow2 - reversed rainbow palette from purple to red
## gray.palette - set grey as a palette so it takes a single number
## matlab.like palette is in library(colorRamps)

library(colorRamps)

## basic colors for colorblind ---------------------------------------------
coloring <- c("black", "red", "blue")

## palette of black points
black.pal <- function(x) rep("black", x)

## get hex
GetColorHex <- function(color) {
  c <- col2rgb(color)
  sprintf("#%02X%02X%02X", c[1],c[2],c[3], c[1], c[2], c[3])
}

## percent.col; fill a certain percentage with a given colour -------------
## create a function that fills a certain percentage of levels with a given color.
## created for Andy to colour gyres
percent.col <- function(n.levels, main.col = "white", back.col = "grey", cutoff = 0.3) {
  cut <- round(n.levels * cutoff, 0)
  c(rep(main.col, cut), rep(back.col, n.levels - cut - 1))
}

## heat saturation colour --------------------------------------------------
heat.sat <- function (n, h = 1/6, s = s, v = 1, alpha = 1) {
  if ((n <- as.integer(n[1L])) > 0) {
    n
    if (n > 0) hsv(h, s = seq.int(from = 1 / (2 * n), to = 1 - 1 / (2 * n), length.out = n), v, alpha)
  }
  else character()
}

## heat v colour -----------------------------------------------------------
heat.v <- function (n, h = 1/6, s = 1, v = v, alpha = 1) {
  if ((n <- as.integer(n[1L])) > 0) {
    n
    if (n > 0) hsv(h, s, v = seq.int(from = 1 - 1 / (2 * n), to = 1 / (2 * n), length.out = n), alpha)
  }
  else character()
}

## log heat colour ---------------------------------------------------------
log.heat<- function (n, alpha = 1) {
  if (n < 2) {
    n <- as.integer (n * 1000 + 0.5)
  }
  if ((n <- as.integer(n[1L])) > 0) {

    j <- n %/% 4
    i <- n - j
    q <- round(log(seq(10, 1, length.out = i), 10) / 6, 3)
    c(heat.sat(j, alpha = alpha), hsv(q, 1, v = 1, alpha = alpha))
  }
  else character()
}

## reverse log heat colour -------------------------------------------------
rev.log.heat <- function (n, alpha = 1) {
  if (n < 2) {
    n <- as.integer (n * 1000 + 0.5)
  }
  if ((n <- as.integer(n[1L])) > 0) {
    q <- round((1 - log(seq(1, 10, length.out = n), 10)) / 6, 4)
    hsv(q, 1, v = 1, alpha = alpha)
  }
  else character()
}

## water colours -----------------------------------------------------------
water.colors <- function(n, alpha = 1) {
  if ((n <- as.integer(n[1L])) > 0) {
    j <- n %/% 4
    i <- n - j * 2
    q <- round(seq(0.5, 0.7, length.out = i), 4)
    c(heat.sat(j, h = 0.5, alpha = alpha), hsv(q, 1, v = 1, alpha = alpha), heat.v(j, h = 0.7))
  }
  else character()
}

# rwb ---------------------------------------------------------------------
rwb <- function (n, alpha = 1) {
  if ((n <- as.integer(n[1L])) > 0) {
    # if an even number
    len <- n %/% 2
    if (n %% 2 == 0) {
      # reverse sequence from blue to white
      col <- hsv(2/3, s = rev(seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len)), 1, alpha)
      # sequence from white to red
      col <- c(col, hsv(1, s = seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len), 1, alpha))
    } else {
      # reverse sequence from blue to white
      col <- hsv(2/3, s = rev(seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len)), 1, alpha)
      # white in the middle
      col <- c(col, hsv(0, 0, 1))
      # sequence from white to red
      col <- c(col, hsv(1, s = seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len), 1, alpha))
    }
  }
  else character()
}

# rwbt ---------------------------------------------------------------------
rwbt <- function (n) {
  if ((n <- as.integer(n[1L])) > 0) {
    # if an even number
    len <- n %/% 2
    if (n %% 2 == 0) {
      # reverse sequence from blue to white
      col <- hsv(2/3, 1, 1, rev(seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len)))
      # sequence from white to red
      col <- c(col, hsv(1, 1, 1, seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len)))
    } else {
      # reverse sequence from blue to white
      col <- hsv(2/3, 1, 1, rev(seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len)))
      # white in the middle
      col <- c(col, hsv(0, 1, 1, 0))
      # sequence from white to red
      col <- c(col, hsv(1, 1, 1, seq.int(from = 1/(2 * len), to = 1 - 1/(2 * len), length.out = len)))
    }
  }
  else character()
}

# rainbow 2 ----------------------------------------------------------------
rainbow2 <- function (n, s = 1, v = 1, alpha = 1) {
  if ((n <- as.integer(n[1L])) > 0) {
    hsv(h = seq.int(3/4, 0, length.out = n) %% 1, s, v, alpha)
  }
  else character()
}

# gray.palette ------------------------------------------------------------
gray.palette <- function(n, start = 1, end = 0) {
  if ((n <- as.integer(n[1L])) > 0) {
    gray(seq(start, end, length.out = n))
  }
  else character()
}