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MapGen2SL <- function(file, proj4string=CRS(as.character(NA))) {
con <- file(file, "r")
hold <- readLines(con)
close(con)
if (length(hold) == 500000L) warning("500,000 point limit reached")
starts <- which(hold == "# -b")
n <- length(starts)
if (n < 1) stop("Not a Mapgen format file")
res <- vector(mode="list", length=n)
IDs <- paste("L", 1:n, sep="_")
for (i in 1:n) {
if (i < n) {
x <- t(sapply(strsplit(hold[(starts[i]+1):
(starts[i+1]-1)], "\t"), as.numeric))
} else {
x <- t(sapply(strsplit(hold[(starts[i]+1):
length(hold)], "\t"), as.numeric))
}
res[[i]] <- Lines(list(Line(x
#, proj4string=proj4string
)), ID=IDs[i])
}
SL <- SpatialLines(res, proj4string=proj4string)
SL
}
ArcObj2SLDF <- function(arc, proj4string=CRS(as.character(NA)), IDs) {
df <- data.frame(arc[[1]])
n <- length(arc[[2]])
LinesList <- vector(mode="list", length=n)
if (missing(IDs)) IDs <- paste("L", 1:n, sep="_")
if (length(IDs) != n) stop("IDs length differs from number of arcs")
row.names(df) <- IDs
for (i in 1:n) {
crds <- cbind(arc[[2]][[i]][[1]], arc[[2]][[i]][[2]])
LinesList[[i]] <- Lines(list(Line(coords=crds
#, proj4string=proj4string
)), ID=IDs[i])
}
SL <- SpatialLines(LinesList, proj4string=proj4string)
res <- SpatialLinesDataFrame(SL, data=df)
res
}
ContourLines2SLDF <- function(cL, proj4string=CRS(as.character(NA))) {
if (length(cL) < 1L) stop("cL too short")
cLstack <- tapply(1:length(cL), sapply(cL, function(x) x[[1]]),
function(x) x, simplify=FALSE)
df <- data.frame(level=names(cLstack))
m <- length(cLstack)
res <- vector(mode="list", length=m)
IDs <- paste("C", 1:m, sep="_")
row.names(df) <- IDs
for (i in 1:m) {
res[[i]] <- Lines(.contourLines2LineList(cL[cLstack[[i]]]#,
# proj4string=proj4string
), ID=IDs[i])
}
SL <- SpatialLines(res, proj4string=proj4string)
res <- SpatialLinesDataFrame(SL, data=df)
res
}
.contourLines2LineList <- function(cL#, proj4string=CRS(as.character(NA))
) {
n <- length(cL)
res <- vector(mode="list", length=n)
for (i in 1:n) {
crds <- cbind(cL[[i]][[2]], cL[[i]][[3]])
res[[i]] <- Line(coords=crds#, proj4string=proj4string
)
}
res
}
# to be moved to glue with RarcInfo:
pal2SpatialPolygons <- function(arc, pal, IDs, dropPoly1=TRUE,
proj4string=CRS(as.character(NA))) {
if (missing(IDs)) stop("IDs required")
if (dropPoly1) pale <- lapply(pal[[2]][-1], function(x) x[[1]])
else pale <- lapply(pal[[2]], function(x) x[[1]])
if (length(pale) != length(IDs)) stop("map and IDs differ in length")
tab <- table(factor(IDs))
n <- length(tab)
IDss <- names(tab)
reg <- match(IDs, IDss)
belongs <- lapply(1:n, function(x) which(x == reg))
# assemble the list of Polygons
Srl <- vector(mode="list", length=n)
for (i in 1:n) {
bi <- belongs[[i]]
nParts <- length(bi)
palei_list <- list()
for (j in 1:nParts) {
this <- bi[j]
paleij <- pale[[this]]
if (any(paleij == 0)) {
zeros <- which(paleij == 0)
palei_list <- c(palei_list,
list(paleij[1:(zeros[1]-1)]))
for (k in 1:length(zeros)) {
if (k == length(zeros)) {
lp <- length(paleij)
lz <- zeros[length(zeros)]
palei_list <- c(palei_list,
list(paleij[(lz+1):lp]))
} else {
zk <- zeros[k]
zk1 <- zeros[k+1]
palei_list <- c(palei_list,
list(paleij[(zk+1):(zk1-1)]))
}
}
} else palei_list <- c(palei_list, list(paleij))
}
nParts <- length(palei_list)
srl <- vector(mode="list", length=nParts)
for (j in 1:nParts) {
paleij <- palei_list[[j]]
nArcs <- length(paleij)
x <- NULL
y <- NULL
for (k in 1:nArcs) {
kk <- paleij[k]
if (kk > 0) {
x <- c(x, arc[[2]][[kk]][[1]])
y <- c(y, arc[[2]][[kk]][[2]])
} else {
x <- c(x, rev(arc[[2]][[-kk]][[1]]))
y <- c(y, rev(arc[[2]][[-kk]][[2]]))
}
}
if ((x[1] != x[length(x)]) || (y[1] != y[length(y)])) {
x <- c(x, x[1])
y <- c(y, y[1])
}
srl[[j]] <- Polygon(coords=cbind(x, y))
}
Srl[[i]] <- Polygons(srl, ID=IDss[i])
}
res <- as.SpatialPolygons.PolygonsList(Srl, proj4string=proj4string)
res
}
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