\name{grabChrMapProbes}
\alias{grabChrMapProbes}

\title{ Identify the probes plotted using plotChrMap }
\description{

  Allows the user to interactively select regions of the plotChrMap
  heatmap, identifying all the probes plotted in those regions.

}
\usage{
grabChrMapProbes( plotmap )
}
\arguments{
  \item{plotmap}{The output of the \code{plotChrMap} function.}
}
\details{

  This function takes the output of the \code{plotChrMap} function and
  uses it to identify the probes responsible for the signals plotted on
  the \code{plotChrMap} heatmap. It asks the user to select two points
  on either side of the heatmap bands of interest (specifically,
  boundary for inclusion of a given band is its left-hand edge), and
  returns a vector of probe identifiers. This can be passed directly to
  AnnotationDbi::mget to yield gene symbols and other annotation.

  Note that the plotting area layout() and par() values are not reset on
  exit, so that this function can be reused as many times as is desired.

}
\value{

  A character vector of probe identifiers. If multiple probe identifiers
  have been averaged into a single band these identifiers will be string
  concatenated, separated by semicolons. In such cases the start, end
  and interval arguments to \code{plotChrMap} can be used to split
  the probes into separate bands.

}
\author{ Tim F Rayner }
\seealso{
  \code{\link{plotChrMap}}
}
\examples{
data('demo')
plotmap <- plotChrMap(chrdata, '22', cytoband='q11.23')
probes <- grabChrMapProbes(plotmap)
library('hgu95av2.db')
genes <- mget(probes, hgu95av2SYMBOL, ifnotfound=NA)
}
\keyword{hplot}