Nothing
cells<-function(voronoi.obj)
{
if(!inherits(voronoi.obj,"voronoi"))
stop("voronoi.obj must be of class \"voronoi\"")
tri <- voronoi.obj$tri
nnabs <- integer(tri$n)
nptr <- integer(tri$n)
nptr1 <- integer(tri$n)
nbnos <- integer(tri$n)
ret <- NULL
for(i in 1:tri$n){
vs <- voronoi.findvertices(i, voronoi.obj)
if(length(vs)>0){
center <- c(tri$x[i],tri$y[i])
neighbours <- sort(c(arcs(tri)[arcs(tri)[,1]==i,2],arcs(tri)[arcs(tri)[,2]==i,1]))
nodes <- rbind(voronoi.obj$x[vs],voronoi.obj$y[vs])
rownames(nodes) <- c("x","y")
area <- voronoi.polyarea( voronoi.obj$x[vs], voronoi.obj$y[vs])
ret[[i]] <- list(cell=i,center=center,
neighbours=neighbours,
nodes=nodes,area=area)
} else {
center <- c(tri$x[i],tri$y[i])
neighbours <- sort(c(arcs(tri)[arcs(tri)[,1]==i,2],arcs(tri)[arcs(tri)[,2]==i,1]))
nodes <- NA # should better return at least the non-dummy nodes
area <- NA
ret[[i]] <- list(cell=i,center=center,
neighbours=neighbours,
nodes=nodes,area=area)
}
}
ret
}
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