scrgb {ggplot}R Documentation

Scale: colour (rgb)

Description

Scale continuous variables to red, green and blue components of colour.

Usage

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

Arguments

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

Details

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.

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

Author(s)

Hadley Wickham <h.wickham@gmail.com>

See Also

map_colour_rgb, rgb

Examples

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))

[Package ggplot version 0.4.2 Index]