% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/layout.R
\name{layout_as_star}
\alias{layout_as_star}
\alias{as_star}
\title{Generate coordinates to place the vertices of a graph in a star-shape}
\usage{
layout_as_star(graph, center = V(graph)[1], order = NULL)

as_star(...)
}
\arguments{
\item{graph}{The graph to layout.}

\item{center}{The id of the vertex to put in the center. By default it is
the first vertex.}

\item{order}{Numeric vector, the order of the vertices along the perimeter.
The default ordering is given by the vertex ids.}

\item{...}{Arguments to pass to \code{layout_as_star()}.}
}
\value{
A matrix with two columns and as many rows as the number of vertices
in the input graph.
}
\description{
A simple layout generator, that places one vertex in the center of a circle
and the rest of the vertices equidistantly on the perimeter.
}
\details{
It is possible to choose the vertex that will be in the center, and the
order of the vertices can be also given.
}
\section{Related documentation in the C library}{
\href{https://igraph.org/c/html/0.10.17/igraph-Layout.html#igraph_layout_star}{\code{layout_star()}}, \href{https://igraph.org/c/html/0.10.17/igraph-Basic.html#igraph_vcount}{\code{vcount()}}, \href{https://igraph.org/c/html/0.10.17/igraph-Layout.html#igraph_layout_circle}{\code{layout_circle()}}
}

\examples{

g <- make_star(10)
layout_as_star(g)

## Alternative form
layout_(g, as_star())
}
\seealso{
\code{\link[=layout]{layout()}} and \code{\link[=layout_with_drl]{layout_with_drl()}} for other layout
algorithms, \code{\link[=plot.igraph]{plot.igraph()}} and \code{\link[=tkplot]{tkplot()}} on how to
plot graphs and \code{\link[=star]{star()}} on how to create ring graphs.

Other graph layouts: 
\code{\link{add_layout_}()},
\code{\link{component_wise}()},
\code{\link{layout_}()},
\code{\link{layout_as_bipartite}()},
\code{\link{layout_as_tree}()},
\code{\link{layout_in_circle}()},
\code{\link{layout_nicely}()},
\code{\link{layout_on_grid}()},
\code{\link{layout_on_sphere}()},
\code{\link{layout_randomly}()},
\code{\link{layout_with_dh}()},
\code{\link{layout_with_fr}()},
\code{\link{layout_with_gem}()},
\code{\link{layout_with_graphopt}()},
\code{\link{layout_with_kk}()},
\code{\link{layout_with_lgl}()},
\code{\link{layout_with_mds}()},
\code{\link{layout_with_sugiyama}()},
\code{\link{merge_coords}()},
\code{\link{norm_coords}()},
\code{\link{normalize}()}
}
\author{
Gabor Csardi \email{csardi.gabor@gmail.com}
}
\concept{graph layouts}
\keyword{graphs}
