1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
\name{smoothColors}
\alias{smoothColors}
\title{Build a vector of color values}
\usage{
smoothColors(...,alpha=NA)
}
\arguments{
\item{...}{an arbitrary sequence of color names and integers beginning
and ending with a color name.}
\item{alpha}{optional \samp{alpha} (transparency) value.}
}
\description{
\samp{smoothColors} calculates a sequence of colors. If two color names
in the arguments are separated by a number, that number of interpolated
colors will be inserted between the two color endpoints. Any number of
color names and integers may be passed, but the last argument must be
a color name. If more than one integer appears between two color names,
only the first will be used in the interpolation and the others will be
ignored.
}
\value{A vector of hexadecimal color values as used by \samp{col}.}
\note{
For more R functions that transform numeric values into
colors or produce colors that can be used to represent values, see the
\pkg{colourschemes} package.
}
\author{Barry Rowlingson}
\seealso{\link{color.gradient},\link{rgb}}
\examples{
plot(1:10,main="Test opaque colors",type="n",axes=FALSE)
box()
rect(1:7,1:7,3:9,3:9,col=smoothColors("red",2,"green",2,"blue"))
}
\keyword{misc}
|
