Nothing
tile.centroids <- function(tl){
#
# "tl" <--> "tile list".
#
coit <- function (x,y) {
#
# "coit" <--> "centroid of individual tile".
#
x <- c(x,x[1])
y <- c(y,y[1])
n <- length(x)
u <- x[-n]*y[-1]
v <- x[-1]*y[-n]
w <- x[-n]+x[-1]
z <- y[-n]+y[-1]
A <- 3*(sum(u)-sum(v))
Cx <- sum(w*(u-v))/A
Cy <- sum(z*(u-v))/A
c(Cx,Cy)
}
ccc <- lapply(tl,function(x){coit(x$x,x$y)})
ccc <- as.data.frame(matrix(unlist(ccc),ncol=2,byrow=TRUE))
names(ccc) <- c("x","y")
ccc
}
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