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#' @title Plot credits
#' @description Plot credits (sources, author, year...).
#' @name mf_credits
#' @eval my_params(c('col'))
#' @param pos position, one of 'bottomleft', 'bottomright' or 'rightbottom'
#' @param txt text of the credits, use '\\n' to add line breaks
#' @param cex cex of the credits
#' @param font font of the credits
#' @param bg background color
#' @export
#' @return No return value, credits are displayed.
#' @examples
#' mtq <- mf_get_mtq()
#' mf_map(mtq)
#' mf_credits(txt = "Author\nSources - Year")
mf_credits <- function(txt = "Source(s) & Author(s)",
pos = "bottomleft",
col,
cex = .6,
font = 3,
bg = NA) {
test_cur_plot()
if (missing(col)) {
col <- getOption("mapsf.fg")
}
pd <- par("usr")
pdp <- strwidth("M", units = "user", cex = 1) / 2
w <- strwidth(s = txt, units = "user", cex = cex, font = font)
h <- strheight(s = txt, units = "user", cex = cex, font = font)
ppos <- switch(pos,
bottomleft = {
xr <- pd[1] + w + 2 * pdp
xl <- pd[1]
yb <- pd[3]
yt <- pd[3] + h + 2 * pdp
pd[1] <- pd[1] + pdp
pd[3] <- pd[3] + pdp
list(
pd = pd, adj = c(0, 0), srt = 0,
xr = xr, xl = xl, yb = yb, yt = yt
)
},
bottomright = {
xr <- pd[2]
xl <- pd[2] - w - 2 * pdp
yb <- pd[3]
yt <- pd[3] + h + 2 * pdp
pd[1] <- pd[2] - pdp
pd[3] <- pd[3] + pdp
list(
pd = pd, adj = c(1, 0), srt = 0,
xr = xr, xl = xl, yb = yb, yt = yt
)
},
rightbottom = {
xr <- pd[2]
xl <- pd[2] - h - 2 * pdp
yb <- pd[3]
yt <- pd[3] + w + 2 * pdp
pd[1] <- pd[2] - pdp
pd[3] <- pd[3] + pdp
list(
pd = pd, adj = c(0, 0), srt = 90,
xr = xr, xl = xl, yb = yb, yt = yt
)
}
)
rect(
xleft = ppos$xl, ybottom = ppos$yb, xright = ppos$xr,
ytop = ppos$yt, col = bg, border = NA, xpd = TRUE
)
text(
x = ppos$pd[1], y = ppos$pd[3], labels = txt,
cex = cex, xpd = TRUE, adj = ppos$adj,
col = col, srt = ppos$srt, font = font
)
}
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