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#' @title Proportional Symbols Layer
#' @name propSymbolsLayer
#' @description Plot a proportional symbols layer.
#' @param x an sf object, a simple feature collection. If x is used then spdf, df, spdfid and dfid are not.
#' @param spdf a SpatialPointsDataFrame or a SpatialPolygonsDataFrame; if spdf
#' is a SpatialPolygonsDataFrame symbols are plotted on centroids.
#' @param df a data frame that contains the values to plot. If df is missing
#' spdf@data is used instead.
#' @param spdfid identifier field in spdf, default to the first column
#' of the spdf data frame. (optional)
#' @param dfid identifier field in df, default to the first column
#' of df. (optional)
#' @param var name of the numeric field in df to plot.
#' @param inches size of the biggest symbol (radius for circles, width for
#' squares, height for bars) in inches.
#' @param symbols type of symbols, one of "circle", "square" or "bar".
#' @param col color of symbols.
#' @param border color of symbols borders.
#' @param lwd width of symbols borders.
#' @param fixmax value of the biggest symbol (see Details).
#' @param legend.pos position of the legend, one of "topleft", "top",
#' "topright", "right", "bottomright", "bottom", "bottomleft", "left" or a
#' vector of two coordinates in map units (c(x, y)). If
#' legend.pos is "n" then the legend is not plotted.
#' @param legend.title.txt title of the legend.
#' @param legend.title.cex size of the legend title.
#' @param legend.values.cex size of the values in the legend.
#' @param legend.values.rnd number of decimal places of the values
#' displayed in the legend.
#' @param legend.style either "c" or "e". The legend has two display
#' styles, "c" stands for compact and "e" for extended.
#' @param legend.frame boolean; whether to add a frame to the legend (TRUE) or
#' not (FALSE).
#' @param add whether to add the layer to an existing plot (TRUE) or
#' not (FALSE).
#' @details
#' Two maps with the same inches and fixmax parameters will be comparable.
#' @export
#' @seealso \link{legendBarsSymbols}, \link{legendCirclesSymbols},
#' \link{legendSquaresSymbols}, \link{propSymbolsChoroLayer},
#' \link{propSymbolsTypoLayer}
#' @examples
#' library(sf)
#' mtq <- st_read(system.file("gpkg/mtq.gpkg", package="cartography"))
#' plot(st_geometry(mtq))
#' propSymbolsLayer(x = mtq, var = "POP")
#'
#' plot(st_geometry(mtq), col = "lightblue4",border = "lightblue3",
#' bg = "lightblue1")
#' # Population plot on proportional symbols
#' propSymbolsLayer(x = mtq, var = "POP",
#' symbols = "circle", col = "white",
#' legend.pos = "right", border = "grey",
#' legend.title.txt = "Total\nPopulation",
#' legend.style = "c")
#' # Layout plot
#' layoutLayer(title = "Population Distribution in Martinique, 2015")
propSymbolsLayer <- function(x, spdf, df, spdfid = NULL, dfid = NULL, var,
inches = 0.3, fixmax = NULL,
symbols = "circle",
col = "#E84923",
border = "black", lwd = 1,
legend.pos = "bottomleft",
legend.title.txt = var,
legend.title.cex = 0.8,
legend.values.cex = 0.6,
legend.values.rnd = 0,
legend.style = "c",
legend.frame = FALSE,
add = TRUE){
if (missing(x)){
x <- convertToSf(spdf = spdf, df = df, spdfid = spdfid, dfid = dfid)
}
# check merge and order spdf & df
dots <- checkMergeOrder(x = x, var = var)
# Double color management
mycols <- rep(col, nrow(dots))
if (is.null(fixmax)){
fixmax <- max(dots[[var]])
}
# compute sizes
sizes <- sizer(dots = dots, inches = inches, var = var,
fixmax = fixmax, symbols = symbols)
# size and values for legend, hollow circle (fixmax case)
sizeMax <- max(sizes)
if (inches <= sizeMax){
sizevect <- xinch(seq(inches, min(sizes), length.out = 4))
varvect <- seq(fixmax, 0, length.out = 4)
inches <- sizeMax
}else{
mycols <- c(NA, mycols)
border <- c(NA, rep(border, nrow(dots)))
dots <- rbind(dots[1,],dots)
dots[1,var] <- fixmax
sizes <- c(inches, sizes)
sizevect <- xinch(seq(inches, min(sizes), length.out = 4))
varvect <- seq(fixmax, 0,length.out = 4 )
}
# plot
if (add==FALSE){
bbx <- sf::st_bbox(x)
plot(0, type='n', axes = FALSE, ann = FALSE, asp = 1,
xlim = bbx[c(1,3)], ylim = bbx[c(2,4)])
}
switch(symbols,
circle = {
symbols(dots[, 1:2, drop = TRUE], circles = sizes, bg = mycols,
fg = border, lwd = lwd, add = TRUE, inches = inches, asp = 1)
legendCirclesSymbols(pos = legend.pos,
title.txt = legend.title.txt,
title.cex = legend.title.cex,
values.cex = legend.values.cex,
var = c(min(dots[[var]]),max(dots[[var]])),
inches = inches,
col = col, lwd = lwd,
frame = legend.frame,
values.rnd = legend.values.rnd,
style = legend.style)
},
square = {
symbols(dots[, 1:2, drop = TRUE], squares = sizes, bg = mycols,
fg = border, lwd = lwd, add = TRUE, inches = inches, asp = 1)
legendSquaresSymbols(pos = legend.pos,
title.txt = legend.title.txt,
title.cex = legend.title.cex,
values.cex = legend.values.cex,
var = c(min(dots[[var]]),max(dots[[var]])),
inches = inches,
col = col, lwd = lwd,
frame = legend.frame,
values.rnd = legend.values.rnd,
style = legend.style)
},
bar = {
tmp <- as.matrix(data.frame(width = inches/7, height = sizes))
dots[[2]] <- dots[[2]] + yinch(sizes/2)
symbols(dots[, 1:2, drop = TRUE], rectangles = tmp, add = TRUE,
bg = mycols,fg = border, lwd = lwd, inches = inches, asp = 1)
legendBarsSymbols(pos = legend.pos,
title.txt = legend.title.txt,
title.cex = legend.title.cex,
values.cex = legend.values.cex,
var = c(min(dots[[var]]),max(dots[[var]])),
inches = inches,
col = col, lwd = lwd,
frame = legend.frame,
values.rnd = legend.values.rnd,
style = legend.style)
})
}
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