#' Add places information to GPX table
#'
#' @param gpx_table \code{data.frame} created by get_table_from_gpx
#' @param places \code{data.frame} with columns \code{lat, lon, label, title} that can
#' be used to add some information to the pure GPX file
#'
#'
get_gpx_table_with_places <- function(gpx_table, places){
if (!("label" %in% names(gpx_table))) {
gpx_table$label <- rep(NA, nrow(gpx_table))
}
if (!("title" %in% names(gpx_table))) {
gpx_table$title <- rep(NA, nrow(gpx_table))
}
stopifnot("lat" %in% names(places))
stopifnot("lon" %in% names(places))
stopifnot("label" %in% names(places))
stopifnot("title" %in% names(places))
for (row_index in 1:nrow(places)) {
index <- which.min(sqrt((gpx_table$lat - places$lat[row_index]) ^ 2 + (gpx_table$lon - places$lon[row_index]) ^ 2))
gpx_table$label[index] <- as.character(places$label[row_index])
gpx_table$title[index] <- as.character(places$title[row_index])
}
return(gpx_table)
}
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