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Spatial <- function(bbox, proj4string = CRS(as.character(NA))) {
new("Spatial", bbox=bbox, proj4string=proj4string)
}
if (!isGeneric("bbox"))
setGeneric("bbox", function(obj)
standardGeneric("bbox"))
if (!isGeneric("coordinates"))
setGeneric("coordinates", function(obj, ...)
standardGeneric("coordinates"))
if (!isGeneric("coordinates<-"))
setGeneric("coordinates<-", function(object, value)
standardGeneric("coordinates<-"))
if (!isGeneric("coordnames"))
setGeneric("coordnames", function(x)
standardGeneric("coordnames"))
if (!isGeneric("coordnames<-"))
setGeneric("coordnames<-", function(x,value)
standardGeneric("coordnames<-"))
if (!isGeneric("dimensions"))
setGeneric("dimensions", function(obj)
standardGeneric("dimensions"))
if (!isGeneric("gridded"))
setGeneric("gridded", function(obj)
standardGeneric("gridded"))
if (!isGeneric("overlay"))
setGeneric("overlay", function(x, y, ...)
standardGeneric("overlay"))
if (!isGeneric("plot"))
setGeneric("plot", function(x, y, ...)
standardGeneric("plot"))
if (!isGeneric("polygons"))
setGeneric("polygons", function(obj)
standardGeneric("polygons"))
if (!isGeneric("polygons<-"))
setGeneric("polygons<-", function(object, value)
standardGeneric("polygons<-"))
if (!isGeneric("spplot"))
setGeneric("spplot", function(obj, ...)
standardGeneric("spplot"))
if (!isGeneric("spsample"))
setGeneric("spsample", function(x, n, type, ...)
standardGeneric("spsample"))
if (!isGeneric("summary"))
setGeneric("summary", function(object, ...)
standardGeneric("summary"))
if (!isGeneric("spChFIDs"))
setGeneric("spChFIDs", function(obj, x)
standardGeneric("spChFIDs"))
if (!isGeneric("surfaceArea"))
setGeneric("surfaceArea", function(m, ...)
standardGeneric("surfaceArea"))
if (!isGeneric("split"))
setGeneric("split", function(x, f, drop = FALSE, ...)
standardGeneric("split"))
bbox.default <- function(obj) {
is_points <- function(obj) {
is <- FALSE
if(is.array(obj))
if(length(dim(obj))==2)
if(dim(obj)[2]>=2) is <- TRUE
is
}
if(!is_points(obj))stop('object not a >= 2-column array')
xr <- range(obj[,1],na.rm=TRUE)
yr <- range(obj[,2],na.rm=TRUE)
res <- rbind(x=xr, y=yr)
colnames(res) <- c("min","max")
res
}
setMethod("bbox", "ANY", bbox.default)
setMethod("bbox", "Spatial", function(obj) obj@bbox)
setMethod("dimensions", "Spatial", function(obj) nrow(bbox(obj)))
setMethod("polygons", "Spatial", function(obj) {
if (is(obj, "SpatialPolygons"))
as(obj, "SpatialPolygons")
else
stop("polygons method only available for objects of class or deriving from SpatialPolygons")
}
)
summary.Spatial = function(object, ...) {
obj = list()
obj[["class"]] = class(object)
obj[["bbox"]] = bbox(object)
obj[["is.projected"]] = is.projected(object)
obj[["proj4string"]] = object@proj4string@projargs
if (is(object, "SpatialPoints"))
obj[["npoints"]] = nrow(object@coords)
if (is(object, "SpatialGrid") || is(object, "SpatialPixels"))
obj[["grid"]] = gridparameters(object)
if ("data" %in% slotNames(object))
if (ncol(object@data) > 1)
obj[["data"]] = summary(object@data)
else obj[["data"]] = summary(object@data[[1]])
class(obj) = "summary.Spatial"
obj
}
setMethod("summary", "Spatial", summary.Spatial)
print.summary.Spatial = function(x, ...) {
cat(paste("Object of class ", x[["class"]], "\n", sep = ""))
cat("Coordinates:\n")
print(x[["bbox"]])
cat(paste("Is projected:", x[["is.projected"]], "\n"))
# cat(paste("proj4string : [", x[["proj4string"]], "]\n", sep=""))
pst <- paste(strwrap(x[["proj4string"]]), collapse="\n")
if (nchar(pst) < 40) cat(paste("proj4string : [", pst, "]\n", sep=""))
else cat(paste("proj4string :\n[", pst, "]\n", sep=""))
if (!is.null(x$npoints)) {
cat("Number of points: ")
cat(x$npoints)
cat("\n")
}
if (!is.null(x$n.polygons)) {
cat("Number of polygons: ")
cat(x$n.polygons)
cat("\n")
}
if (!is.null(x$grid)) {
cat("Grid attributes:\n")
print(x$grid)
}
if (!is.null(x$data)) {
cat("Data attributes:\n")
print(x$data)
}
invisible(x)
}
# sp.axes = FALSE
#asp <- function(x, ylim) {
# if (is.na(proj4string(x)) || is.projected(x))
# return(1.0)
# else
# return(1/cos((mean(ylim) * pi)/180))
#}
plot.Spatial <- function(x, xlim=NULL, ylim=NULL,
asp = NA, axes = FALSE, bg = par("bg"), ..., setParUsrBB=FALSE) {
bbox <- bbox(x)
if (is.null(xlim)) xlim <- bbox[1,]
if (is.null(ylim)) ylim <- bbox[2,]
if (is.na(asp)) asp <- ifelse(is.na(proj4string(x)) || is.projected(x),
1.0, 1/cos((mean(ylim) * pi)/180))
frame() # S-Plus compatible version of plot.new()
if (is.R()) {
plot.window(xlim = xlim, ylim = ylim, asp = asp, ...)
if (setParUsrBB) par(usr=c(xlim, ylim))
} else {
plot.default(x = bbox[1,], y = bbox[2,], type = "n",
xlim = xlim, ylim = ylim, asp = asp,
ann=FALSE, axes=FALSE, ...)
if (setParUsrBB) par(usr=c(xlim, ylim))
}
pl_reg <- par("usr")
rect(xleft=pl_reg[1], ybottom=pl_reg[3], xright=pl_reg[2],
ytop=pl_reg[4], col=bg, border=FALSE)
if (axes) { # set up default axes system & box:
box()
isp = is.projected(x)
if (!is.na(isp) && !isp) {
degAxis(1, ...)
degAxis(2, ...)
} else {
axis(1, ...)
axis(2, ...)
}
# axis(3, labels = FALSE, ...)
# axis(4, labels = FALSE, ...)
}
}
setMethod("plot", signature(x = "Spatial", y = "missing"),
function(x,y,...) plot.Spatial(x,...))
degAxis = function (side, at, labels, ...) {
if (missing(at))
at = axTicks(side)
if (missing(labels)) {
labels = FALSE
if (side == 1 || side == 3)
labels = parse(text = degreeLabelsEW(at))
else if (side == 2 || side == 4)
labels = parse(text = degreeLabelsNS(at))
}
axis(side, at = at, labels = labels, ...)
}
setReplaceMethod("coordinates", signature(object = "Spatial", value = "ANY"),
function(object, value)
stop("setting coordinates cannot be done on Spatial objects, where they have already been set")
)
setMethod("[[", c("Spatial", "ANY", "missing"),
function(x, i, j, ...) {
if (!("data" %in% slotNames(x)))
stop("no [[ method for object without attributes")
x@data[[i]]
}
)
setReplaceMethod("[[", c("Spatial", "ANY", "missing", "ANY"),
function(x, i, j, value) {
if (!("data" %in% slotNames(x)))
stop("no [[ method for object without attributes")
if (is.character(i) && any(!is.na(match(i, dimnames(coordinates(x))[[2]]))))
stop(paste(i, "is already present as a coordinate name!"))
x@data[[i]] <- value
x
}
)
setMethod("$", "Spatial",
function(x, name) {
if (!("data" %in% slotNames(x)))
stop("no $ method for object without attributes")
x@data[[name]]
}
)
setReplaceMethod("$", "Spatial",
function(x, name, value) {
if (!("data" %in% slotNames(x)))
stop("no $<- method for object without attributes")
x@data[[name]] = value
x
}
)
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