scrgb: Scale: colour (rgb) Scale continuous variables to red, green...
In hadley/ggplot1: Before there was ggplot2

Description Usage Arguments Details Examples

The RGB colour space is NOT perceptually uniform. Use this scale with care. It is extremely ill-advised to map variables to more than one of r, g, b, or a.

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scrgb(plot, name = "", to = list())

scfillrgb(plot, name = "", to = list())

`plot`	plot
`name`	namen of the scale (used in the legend)
`to`	named list of target ranges (r.to, g.to, b.to, a.to)

Note: alpha mappings only work with the Quartz and PDF devices.

library(ggplot2movies)
p <- scrgb(ggplot(movies, aes=list(y=rating, x=year)))
ggpoint(p, list(r=year))
ggpoint(p, list(b=rating))
ggpoint(p, list(b=rating, r=1))
scrgb(ggpoint(p, list(b=rating, r=1)), list(b.to=c(0.25,0.75)))
ggpoint(p, list(b=rating, r=year))
ggpoint(p, list(b=rating, r=year, g=year))