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% Generated by roxygen2 (4.0.1): do not edit by hand
\name{scale_linetype}
\alias{scale_linetype}
\alias{scale_linetype_continuous}
\alias{scale_linetype_discrete}
\title{Scale for line patterns.}
\usage{
scale_linetype(..., na.value = "blank")
scale_linetype_continuous(...)
scale_linetype_discrete(..., na.value = "blank")
}
\arguments{
\item{na.value}{The linetype to use for \code{NA} values.}
\item{...}{common discrete scale parameters: \code{name}, \code{breaks},
\code{labels}, \code{na.value}, \code{limits} and \code{guide}. See
\code{\link{discrete_scale}} for more details}
}
\description{
Default line types based on a set supplied by Richard Pearson,
University of Manchester. Line types can not be mapped to continuous
values.
}
\examples{
library(reshape2) # for melt
library(plyr) # for ddply
ecm <- melt(economics, id = "date")
rescale01 <- function(x) (x - min(x)) / diff(range(x))
ecm <- ddply(ecm, "variable", transform, value = rescale01(value))
qplot(date, value, data=ecm, geom="line", group=variable)
qplot(date, value, data=ecm, geom="line", linetype=variable)
qplot(date, value, data=ecm, geom="line", colour=variable)
# See scale_manual for more flexibility
}
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