heatmap.color.scheme: Break points and color vector for heatmaps.
In vdumeaux/mixtR: Matched Interaction across Tissues (MIxT) data analysis

heatmap.color.scheme computes break points and color vector for heatmaps. Can also plot the HCL space for easier customization of colors.

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heatmap.color.scheme(low.breaks = seq(-3, 0, length.out = 21),
  high.breaks = seq(0, 3, length.out = 21), masked.color = "black",
  col.palette = c("blue.red"), plot = FALSE, gp = gpar())

`low.breaks`	breakpoints for the low color
`high.breaks`	breakpoints for the low color.
`masked.color`	color to be used for the gap between the low and high colors.
`col.palette`	either a palette name or index, or a full specification of an hcl palette. See the 'supported.palettes' definition in the code for examples.
`plot`	if TRUE, will plot the HCL color space for the chosen color palette.
`gp`	graphical parameters passed to grid.points and grid.lines when 'plot' is TRUE.

a list with three fields:

`breaks`	vector with break points, size is one more that 'col'
`col`	vector with colors, size one less than 'breaks'
`masked.idx`	idx into 'col' and 'breaks' pointing to the color and the left break point of the masked region (if such a region exists).