scgradient {ggplot}R Documentation

Scale: colour gradient

Description

Scale a continuous variable along a colour gradient.

Usage

scgradient(plot = .PLOT, name="", low='red', mid='white', high="black", midpoint=0, range=c(NA,NA))

Arguments

plot plot object to add scale to
name name of the scale (used in the legend)
low colour at low end of scale
mid colour at middle of scale
high colour at top of scale
midpoint definition of midpoint
range range to scale data to

Details

This scale creates a continuous colour gradient from the low colour to the mid colour to high colour, as defined in the arguments.

Author(s)

Hadley Wickham <h.wickham@gmail.com>

See Also

sccolour

Examples

p <- scgradient(ggplot(movies, aes=list(x=mpaa, y=rating)))
ggjitter(p, list(colour=rating))
ggjitter(p, list(colour=length))
p <- ggjitter(p, list(colour=rating))
scgradient(p, low="yellow")
scgradient(p, high="green", midpoint=5)

[Package ggplot version 0.4.2 Index]