\name{setEdgeSourceArrowRule}
\alias{setEdgeSourceArrowRule}
\alias{setEdgeSourceArrowRule,CytoscapeWindowClass-method}
\title{specify the arrow types to be used at the end of an edge, at the
  'source' node}
\description{
Specify how data attributes -- for the specified named attribute -- are
mapped to the source arrow type.}

\usage{
setEdgeSourceArrowRule(obj, edge.attribute.name, attribute.values, arrows, default='Arrow')
}

\arguments{
  \item{obj}{a \code{CytoscapeWindowClass} object. }
  \item{edge.attribute.name}{the edge attribute whose values will, when this
rule is applied, determine the sourceArrow of each edge.}
  \item{attribute.values}{A list of scalar, discrete values. For
  instance, interaction types:  'phosphorylates', 'ubiquinates',
  'represses', 'activates' }
\item{arrows}{One arrow type for each of the attribute.values}
\item{default}{The arrow type to use when an explicit mapping is not provided.}

}

\value{
None.
}
\author{Paul Shannon}

\seealso{
  \code{\link{getArrowShapes}}
}

\examples{
  cw <- new.CytoscapeWindow ('setEdgeSourceArrowRule.test', graph=makeSimpleGraph())
  arrows <- c ('Arrow', 'Diamond', 'Circle')
  edgeType.values <- c ('phosphorylates', 'synthetic lethal', 'undefined')
  setEdgeSourceArrowRule (cw, 'edgeType', edgeType.values, arrows)
  redraw (cw)
}

\keyword{graph}