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\name{scale_hue}
\alias{scale_hue}
\alias{scale_colour_hue}
\alias{scale_fill_hue}
\alias{ScaleHue}
\alias{scale_colour_discrete}
\alias{scale_fill_discrete}
\alias{scale_color_hue}
\alias{scale_color_discrete}
\title{scale\_hue}
\description{Qualitative colour scale with evenly spaced hues}
\details{
This page describes scale\_hue, see \code{\link{layer}} and \code{\link{qplot}} for how to create a complete plot from individual components.
}
\usage{scale_colour_hue(name = NULL, h = c(0, 360) + 15, l = 65, c = 100,
limits = NULL, breaks = NULL, labels = NULL, h.start = 0,
direction = 1, formatter = identity, legend = TRUE, ...)}
\arguments{
\item{name}{name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath}
\item{h}{range of hues to use, in [0, 360]}
\item{l}{luminance (lightness), in [0, 100]}
\item{c}{chroma (intensity of colour)}
\item{limits}{numeric vector of length 2, giving the extent of the scale}
\item{breaks}{numeric vector indicating where breaks should lie}
\item{labels}{character vector giving labels associated with breaks}
\item{h.start}{hue to start at}
\item{direction}{direction to travel around the colour wheel, 1 = clockwise, -1 = counter-clockwise}
\item{formatter}{NULL}
\item{legend}{NULL}
\item{...}{other arguments}
}
\seealso{\itemize{
\item \url{http://had.co.nz/ggplot2/scale_hue.html}
}}
\value{A \code{\link{layer}}}
\examples{\dontrun{
dsamp <- diamonds[sample(nrow(diamonds), 1000), ]
(d <- qplot(carat, price, data=dsamp, colour=clarity))
# Change scale label
d + scale_colour_hue()
d + scale_colour_hue("clarity")
d + scale_colour_hue(expression(clarity[beta]))
# Adjust luminosity and chroma
d + scale_colour_hue(l=40, c=30)
d + scale_colour_hue(l=70, c=30)
d + scale_colour_hue(l=70, c=150)
d + scale_colour_hue(l=80, c=150)
# Change range of hues used
d + scale_colour_hue(h=c(0, 90))
d + scale_colour_hue(h=c(90, 180))
d + scale_colour_hue(h=c(180, 270))
d + scale_colour_hue(h=c(270, 360))
# Vary opacity
# (only works with pdf, quartz and cairo devices)
d <- ggplot(dsamp, aes(carat, price, colour = clarity))
d + geom_point(alpha = 0.9)
d + geom_point(alpha = 0.5)
d + geom_point(alpha = 0.2)
}}
\author{Hadley Wickham, \url{http://had.co.nz/}}
\keyword{hplot}
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