gradient.color.scale: Create gradient color scale with midpoint

In smacpod: Statistical Methods for the Analysis of Case-Control Point Data

Create gradient color scale with midpoint

Description

Create gradient color scale with midpoint

Usage

gradient.color.scale(
  minval,
  maxval,
  n = 11,
  low = "blue",
  mid = "white",
  high = "red",
  midpoint = 0,
  ...
)

Arguments

minval	The minimum value of the data to be colored
maxval	The maximum value of the data to be colored
n	The desired number of breaks (approximately)
low	The color for the low values
mid	The color used for the midpoint of the gradient
high	The color used for the high values
midpoint	The midpoint of the color scale
...	Arguments passed on to grDevices::colorRamp colors colors to interpolate; must be a valid argument to col2rgb(). bias a positive number. Higher values give more widely spaced colors at the high end. space a character string; interpolation in RGB or CIE Lab color spaces. interpolate use spline or linear interpolation. alpha logical: should alpha channel (opacity) values be returned? It is an error to give a true value if space is specified.

Value

A list with col and breaks components specifying the colors and breaks of the color scale.

References

Based on code from https://stackoverflow.com/a/10986203/5931362

Examples

data(grave)
lr = logrr(grave)
grad = gradient.color.scale(min(lr$v, na.rm = TRUE), max(lr$v, na.rm = TRUE))
plot(lr, col = grad$col, breaks = grad$breaks)

smacpod documentation built on Sept. 22, 2023, 1:06 a.m.