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setClass("Line",
slots = c(coords = "matrix"),
validity = function(object) {
if (any(is.na(object@coords)))
stop("coords cannot contain missing values")
if (ncol(object@coords) != 2)
return("coords should have 2 columns")
# if (nrow(object@coords) < 2)
# return("Line should have at least 2 points")
return(TRUE)
}
)
setClass("Lines",
slots = c(Lines = "list", ID = "character"),
validity = function(object) {
if (any(sapply(object@Lines, function(x) !is(x, "Line"))))
stop("not a list of Line objects")
return(TRUE)
})
setClass("SpatialLines",
contains = "Spatial",
slots = c(lines = "list"),
validity = function(object) {
if (any(unlist(lapply(object@lines, function(x)
!is(x, "Lines"))))) stop("lines not Lines objects")
IDs <- sapply(slot(object, "lines"), function(i) slot(i, "ID"))
if (anyDuplicated(IDs))
return("non-unique Lines ID slot values")
# if (length(object@lines) !=
# length(unique(sapply(slot(object, "lines"),
# function(x) slot(x, "ID")))))
# return("non-unique Lines ID slot values")
return(TRUE)
}
)
getSLlinesSlot <- function(SL) {
.Deprecated("slot", msg="use *apply and slot directly", package = "sp")
SL@lines
}
getLinesLinesSlot <- function(SL) {
.Deprecated("slot", msg="use *apply and slot directly", package = "sp")
SL@Lines
}
getLinesIDSlot <- function(Lines) {
.Deprecated("slot", msg="use *apply and slot directly", package = "sp")
Lines@ID
}
getSLLinesIDSlots <- function(SL) {
.Deprecated("slot", msg="use *apply and slot directly", package = "sp")
Sls <- slot(SL, "lines")
sapply(Sls, function(x) slot(x, "ID"))
}
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