Nothing
pointsSLDFchain <- function(SLDF, xy, SLmsk='FEAT_ID', mask=NULL, type='SpatialPointsDataFrame') {
if (!(type %in% c('points','SpatialPointsDataFrame')))
stop('pointsSLDFchain :: ERR01 - wrong type input')
nL <- length(SLDF)
if (inherits(xy, "SpatialPointsDataFrame"))
xcoo <- coordinates(xy)
else
xcoo <- xy
ldf <- SLDF@data
if (is.null(mask)) {
for (i in 1:nL) {
vcoo <- coordinates(SLDF)[[i]][[1]] # vector node coordinates: just 1-line features accepted
xchinf <- pointsPolylineD(vcoo, xcoo)
xchinf <- cbind(xchinf, il=i)
if (i == 1) {
xchain <- xchinf
} else {
ids <- xchain[,'dis'] > xchinf[,'dis']
xchain[ids,] <- xchinf[ids,]
}
}
} else {
if (length(mask) != nrow(xcoo))
stop('pointsSLDFchain: mask length differs from input point length')
xchain <- NULL
for (i in 1:nL) {
vcoo <- coordinates(SLDF)[[i]][[1]] # vector node coordinates: just 1-line features accepted
xco <- xcoo[mask == ldf[i,SLmsk],]
xchinf <- pointsPolylineD(vcoo, xco)
xchinf <- cbind(xchinf, il=i)
xchain <- rbind(xchain,xchinf)
}
}
chai <- xchain[,'chain0'] + xchain[,'dc']
eID <- row.names(ldf)[xchain[,'il']]
xchain <- data.frame('chain'=chai, 'eID'=eID, stringsAsFactors = FALSE)
if (type == 'SpatialPointsDataFrame') {
rownames(xchain) <- rownames(xcoo)
colnames(xcoo) <- c('x', 'y')
xchain <- cbind(xcoo, xchain)
coordinates(xchain) <- c('x','y')
}
return(xchain)
} # end function pointsSLDFchain
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