blueWhiteRed: Blue-white-red color sequence

In WGCNA: Weighted Correlation Network Analysis

Blue-white-red color sequence

Description

Generate a blue-white-red color sequence of a given length.

Usage

blueWhiteRed(
    n, 
    gamma = 1, 
    endSaturation = 1,
    blueEnd = c(0.05 + (1-endSaturation) * 0.45 , 0.55 + (1-endSaturation) * 0.25, 1.00),
    redEnd = c(1.0, 0.2 + (1-endSaturation) * 0.6, 0.6*(1-endSaturation)),
    middle = c(1,1,1))

Arguments

n	number of colors to be returned.
gamma	color change power.
endSaturation	a number between 0 and 1 giving the saturation of the colors that will represent the ends of the scale. Lower numbers mean less saturation (lighter colors).
blueEnd	vector of length 3 giving the RGB relative values (between 0 and 1) for the blue or negative end color.
redEnd	vector of length 3 giving the RGB relative values (between 0 and 1) for the red or positive end color.
middle	vector of length 3 giving the RGB relative values (between 0 and 1) for the middle of the scale.

Details

The function returns a color vector that starts with blue, gradually turns into white and then to red. The power gamma can be used to control the behaviour of the quarter- and three quarter-values (between blue and white, and white and red, respectively). Higher powers will make the mid-colors more white, while lower powers will make the colors more saturated, respectively.

Value

A vector of colors of length n.

Author(s)

Peter Langfelder

See Also

numbers2colors for a function that produces a color representation for continuous numbers.

Examples

  par(mfrow = c(3, 1))
  displayColors(blueWhiteRed(50));
  title("gamma = 1")
  displayColors(blueWhiteRed(50, 3));
  title("gamma = 3")
  displayColors(blueWhiteRed(50, 0.5));
  title("gamma = 0.5")

WGCNA documentation built on Sept. 18, 2024, 5:08 p.m.