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modified_function_gradientLegend.R
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modified_function_gradientLegend.R
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library(plotfunctions)
myGradientLegend <- function (valRange, color = "terrain", nCol = 30, pos = 0.875, values = NULL,
side = 4, dec = NULL, length = 0.25, depth = 0.05, inside = FALSE,
coords = FALSE, pos.num = NULL, n.seg = 1, border.col = "black",
tick.col = NULL, fit.margin = TRUE, ...)
{
loc <- c(0, 0, 0, 0)
ticks <- c()
labels <- c()
if (side %in% c(1, 3)) {
if (length(pos) == 1) {
pos.other <- ifelse(side > 2, 1, 0)
switch <- ifelse(inside, 0, 1)
switch <- ifelse(side > 2, 1 - switch, switch)
loc <- getCoords(c(pos - 0.5 * length, pos.other -
switch * depth, pos + 0.5 * length, pos.other +
(1 - switch) * depth), side = c(side, 2, side,
2))
}
else if (length(pos) == 4) {
if (coords) {
loc <- pos
}
else {
loc <- getCoords(pos, side = c(1, 2, 1, 2))
}
}
if (length(n.seg) == 1) {
ticks <- seq(loc[1], loc[3], length = n.seg + 2)
labels <- seq(min(valRange), max(valRange), length = n.seg +
2)
}
else {
labels <- c(min(valRange), sort(n.seg[n.seg > min(valRange) &
n.seg < max(valRange)], decreasing = FALSE),
max(valRange))
b <- diff(loc[c(1, 3)])/diff(range(labels))
ticks <- (labels - min(labels)) * b + loc[1]
}
}
else if (side %in% c(2, 4)) {
if (length(pos) == 1) {
pos.other <- ifelse(side > 2, 1, 0)
switch <- ifelse(inside, 0, 1)
switch <- ifelse(side > 2, 1 - switch, switch)
loc <- getCoords(c(pos.other - switch * depth, pos -
0.5 * length, pos.other + (1 - switch) * depth,
pos + 0.5 * length), side = c(1, side, 1, side))
}
else if (length(pos) == 4) {
if (coords) {
loc <- pos
}
else {
loc <- getCoords(pos, side = c(1, 2, 1, 2))
}
}
if (length(n.seg) == 1) {
ticks <- seq(loc[2], loc[4], length = n.seg + 2)
labels <- seq(min(valRange), max(valRange), length = n.seg +
2)
}
else {
labels <- c(min(valRange), sort(n.seg[n.seg > min(valRange) &
n.seg < max(valRange)], decreasing = FALSE),
max(valRange))
b <- diff(loc[c(2, 4)])/diff(range(labels))
ticks <- (labels - min(labels)) * b + loc[2]
}
}
if (is.null(pos.num)) {
if (side %in% c(1, 3)) {
if (inside) {
pos.num <- ifelse(side == 1, 3, 1)
}
else {
pos.num <- side
}
}
else {
if (inside) {
pos.num <- ifelse(side == 2, 4, 2)
}
else {
pos.num <- side
}
}
}
getcol <- get_palette(color, nCol = nCol)
mycolors <- getcol[["color"]]
if (is.null(tick.col)) {
tick.col = border.col
}
vals <- seq(min(valRange), max(valRange), length = length(mycolors))
im <- as.raster(mycolors[matrix(1:length(mycolors), ncol = 1)])
n <- max(c(length(ticks) - 2, 0))
if (side%%2 == 1) {
im <- t(im)
rasterImage(im, loc[1], loc[2], loc[3], loc[4], col = mycolors,
xpd = T)
if(n.seg != 0){
segments(x0 = ticks, x1 = ticks, y0 = rep(loc[2], n),
y1 = rep(loc[4], n), col = tick.col, xpd = TRUE)
}
rect(loc[1], loc[2], loc[3], loc[4], border = border.col,
xpd = T)
}
else {
im <- rev(im)
rasterImage(im, loc[1], loc[2], loc[3], loc[4], col = mycolors,
xpd = T)
if(n.seg != 0){
segments(x0 = rep(loc[1], n), x1 = rep(loc[3], n), y0 = ticks,
y1 = ticks, col = tick.col, xpd = TRUE)
}
rect(loc[1], loc[2], loc[3], loc[4], border = border.col,
xpd = T)
}
lab.loc.x <- lab.loc.y <- c()
if (side %in% c(1, 3)) {
lab.loc.x <- ticks
if (pos.num == 1) {
lab.loc.y <- rep(loc[2], length(lab.loc.x))
}
else if (pos.num == 3) {
lab.loc.y <- rep(loc[4], length(lab.loc.x))
}
else {
lab.loc.y <- rep((loc[2] + loc[4])/2, length(lab.loc.x))
}
}
else if (side %in% c(2, 4)) {
lab.loc.y <- ticks
if (pos.num == 2) {
lab.loc.x <- rep(loc[1], length(lab.loc.y))
}
else if (pos.num == 4) {
lab.loc.x <- rep(loc[3], length(lab.loc.y))
}
else {
lab.loc.x <- rep((loc[1] + loc[3])/2, length(lab.loc.y))
}
}
determineDec <- function(x) {
out = max(unlist(lapply(strsplit(as.character(x), split = "\\."),
function(y) {
return(ifelse(length(y) > 1, nchar(gsub("^([^0]*)([0]+)$",
"\\1", as.character(y[2]))), 0))
})))
return(out)
}
if (is.null(dec)) {
dec <- min(c(6, determineDec(labels)))
}
eval(parse(text = sprintf("labels = sprintf('%s', round(labels, dec) )",
paste("%.", dec, "f", sep = ""))))
labels <- gsub("^(\\-)(0)([\\.0]*)$", "\\2\\3",
labels)
if (!is.null(values)) {
labels <- values
}
if (fit.margin == TRUE & inside == FALSE) {
lab.height <- max(strheight(labels))
lab.width <- max(strwidth(labels))
lab.cor <- strheight("0") * 0.5
max.pos <- getFigCoords("f")
cex.f <- NA
change <- NA
if (pos.num == 1) {
max.height = lab.loc.y[1] - max.pos[3]
cex.f = max.height/(lab.height + lab.cor)
change <- ifelse(cex.f < 0.8, (lab.height + lab.cor) *
0.8 - max.height, NA)
}
else if (pos.num == 2) {
max.width = lab.loc.x[1] - max.pos[1]
cex.f = max.width/(lab.width + lab.cor)
change <- ifelse(cex.f < 0.8, (lab.width + lab.cor) *
0.8 - max.width, NA)
}
else if (pos.num == 3) {
max.height = max.pos[4] - lab.loc.y[1]
cex.f = max.height/(lab.height + lab.cor)
change <- ifelse(cex.f < 0.8, (lab.height + lab.cor) *
0.8 - max.height, NA)
}
else if (pos.num == 4) {
max.width = max.pos[2] - lab.loc.x[1]
cex.f = max.width/(lab.width + lab.cor)
change <- ifelse(cex.f < 0.8, (lab.width + lab.cor) *
0.8 - max.width, NA)
}
if (cex.f < 0.8) {
margin <- c("bottom", "left", "top",
"right")
warning(sprintf("Increase %s margin to fit labels or decrease the number of decimals, see help(gradientLegend).",
margin[pos.num]))
}
par <- list(...)
if ("cex" %in% names(par)) {
text(x = lab.loc.x, y = lab.loc.y, labels = labels,
col = "black", pos = pos.num, xpd = T, ...)
}
else {
text(x = lab.loc.x, y = lab.loc.y, labels = labels,
col = "black", pos = pos.num, cex = min(c(0.8,
cex.f)), xpd = T)
}
}
else {
par <- list(...)
if ("cex" %in% names(par)) {
text(x = lab.loc.x, y = lab.loc.y, labels = labels,
col = tick.col, pos = pos.num, xpd = T, ...)
}
else {
text(x = lab.loc.x, y = lab.loc.y, labels = labels,
col = tick.col, pos = pos.num, cex = 0.8, xpd = T)
}
}
invisible(list(loc = loc, ticks = ticks, labels = labels,
im = im))
}