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# elegend.R: same as graphics::legend (R 3.1.2) but
# i) has a vert argument to specify which lines are vertical
# ii) allows col to be a character vector with "1" meaning 1
elegend <- function(x, y = NULL, legend, fill=NULL, col = par("col"), border="black",
lty, lwd, pch, angle = 45, density = NULL, bty = "o", bg = par("bg"),
box.lwd = par("lwd"), box.lty = par("lty"), box.col = par("fg"),
pt.bg = NA, cex = 1, pt.cex = cex, pt.lwd = lwd,
xjust = 0, yjust = 1, x.intersp = 1, y.intersp = 1, adj = c(0, 0.5),
text.width = NULL, text.col = par("col"), text.font = NULL,
merge = do.lines && has.pch, trace = FALSE,
plot = TRUE, ncol = 1, horiz = FALSE, title = NULL,
inset = 0, xpd, title.col = text.col, title.adj = 0.5,
seg.len = 2,
vert = FALSE) # logical, which lines are vertical, will be recycled
{
trace <- check.boolean(trace)
plot <- check.boolean(plot)
## the 2nd arg may really be `legend'
if(missing(legend) && !missing(y) &&
(is.character(y) || is.expression(y))) {
legend <- y
y <- NULL
}
mfill <- !missing(fill) || !missing(density)
if(!missing(xpd)) {
op <- par("xpd")
on.exit(par(xpd=op))
par(xpd=xpd)
}
title <- as.graphicsAnnot(title)
if(length(title) > 1) stop("invalid 'title'")
legend <- as.graphicsAnnot(legend)
n.leg <- if(is.call(legend)) 1 else length(legend)
if(n.leg == 0) stop("'legend' is of length 0")
auto <-
if (is.character(x))
match.arg(x, c("bottomright", "bottom", "bottomleft",
"left",
"topleft", "top", "topright",
"right", "center"))
else NA
if(anyNA(auto)) {
xy <- xy.coords(x, y); x <- xy$x; y <- xy$y
nx <- length(x)
if (nx < 1 || nx > 2) stop("invalid coordinate lengths")
} else nx <- 0
xlog <- par("xlog")
ylog <- par("ylog")
rect2 <- function(left, top, dx, dy, density = NULL, angle, ...) {
r <- left + dx; if(xlog) { left <- 10^left; r <- 10^r }
b <- top - dy; if(ylog) { top <- 10^top; b <- 10^b }
rect(left, top, r, b, angle = angle, density = density, ...)
}
segments2 <- function(x1, y1, dx, dy, lty, lwd, col) {
x2 <- x1 + dx; if(xlog) { x1 <- 10^x1; x2 <- 10^x2 }
y2 <- y1 + dy; if(ylog) { y1 <- 10^y1; y2 <- 10^y2 }
# explicit loop allows use of char lty's with "1" meaning 1 and "NA" meaning NA
for(i in seq_along(x1)) {
lt <- lty[i]
if(lt == "1")
lt <- 1
else if(is.na(lt) || lt == "NA")
lt <- 0
segments(x1[i], y1[i], x2[i], y2[i], lty=lt, lwd=lwd[i], col=col[i])
}
}
points2 <- function(x, y, ...) {
if(xlog) x <- 10^x
if(ylog) y <- 10^y
points(x, y, ...)
}
text2 <- function(x, y, ...) {
##--- need to adjust adj == c(xadj, yadj) ?? --
if(xlog) x <- 10^x
if(ylog) y <- 10^y
text(x, y, ...)
}
if(trace > 0)
catn <- function(...)
do.call("cat", c(lapply(list(...),formatC), list("\n")))
cin <- par("cin")
Cex <- cex * par("cex") # = the `effective' cex for text
## at this point we want positive width even for reversed x axis.
if(is.null(text.width))
text.width <- max(abs(strwidth(legend, units="user",
cex=cex, font = text.font)))
else if(!is.numeric(text.width) || text.width < 0)
stop("'text.width' must be numeric, >= 0")
xc <- Cex * xinch(cin[1L], warn.log=FALSE) # [uses par("usr") and "pin"]
yc <- Cex * yinch(cin[2L], warn.log=FALSE)
if(xc < 0) text.width <- -text.width
xchar <- xc
xextra <- 0
yextra <- yc * (y.intersp - 1)
## watch out for reversed axis here: heights can be negative
ymax <- yc * max(1, strheight(legend, units="user", cex=cex)/yc)
ychar <- yextra + ymax
if(trace > 0) catn(" xchar=", xchar, "; (yextra,ychar)=", c(yextra,ychar))
if(mfill) {
##= sizes of filled boxes.
xbox <- xc * 0.8
ybox <- yc * 0.5
dx.fill <- xbox ## + x.intersp*xchar
}
do.lines <- (!missing(lty) && (is.character(lty) || any(lty > 0))
) || !missing(lwd)
## legends per column:
n.legpercol <-
if(horiz) {
if(ncol != 1)
warning(gettextf("horizontal specification overrides: Number of columns := %d",
n.leg), domain = NA)
ncol <- n.leg
1
} else ceiling(n.leg / ncol)
has.pch <- !missing(pch) && length(pch) > 0 # -> default 'merge' is available
merge <- check.boolean(merge)
if(do.lines) {
x.off <- if(merge) -0.7 else 0
} else if(merge)
warning("'merge = TRUE' has no effect when no line segments are drawn")
if(has.pch) {
if(is.character(pch) && !is.na(pch[1L]) &&
nchar(pch[1L], type="c") > 1) {
if(length(pch) > 1)
warning("not using pch[2..] since pch[1L] has multiple chars")
np <- nchar(pch[1L], type="c")
pch <- substr(rep.int(pch[1L], np), 1L:np, 1L:np)
}
## this coercion was documented but not done in R < 3.0.0
if(!is.character(pch)) pch <- as.integer(pch)
}
if (anyNA(auto)) {
##- Adjust (x,y) :
if (xlog) x <- log10(x)
if (ylog) y <- log10(y)
}
if(nx == 2) {
## (x,y) are specifiying OPPOSITE corners of the box
x <- sort(x)
y <- sort(y)
left <- x[1L]
top <- y[2L]
w <- diff(x)# width
h <- diff(y)# height
w0 <- w/ncol # column width
x <- mean(x)
y <- mean(y)
if(missing(xjust)) xjust <- 0.5
if(missing(yjust)) yjust <- 0.5
}
else {## nx == 1 or auto
## -- (w,h) := (width,height) of the box to draw -- computed in steps
h <- (n.legpercol + !is.null(title)) * ychar + yc
w0 <- text.width + (x.intersp + 1) * xchar
if(mfill) w0 <- w0 + dx.fill
if(do.lines) w0 <- w0 + (seg.len + x.off)*xchar
w <- ncol*w0 + .5* xchar
if (!is.null(title)
&& (abs(tw <- strwidth(title, units="user", cex=cex) + 0.5*xchar)) > abs(w)) {
xextra <- (tw - w)/2
w <- tw
}
##-- (w,h) are now the final box width/height.
if (anyNA(auto)) {
left <- x - xjust * w
top <- y + (1 - yjust) * h
} else {
usr <- par("usr")
inset <- rep_len(inset, 2)
insetx <- inset[1L]*(usr[2L] - usr[1L])
left <- switch(auto, "bottomright"=,
"topright"=, "right" = usr[2L] - w - insetx,
"bottomleft"=, "left"=, "topleft"= usr[1L] + insetx,
"bottom"=, "top"=, "center"= (usr[1L] + usr[2L] - w)/2)
insety <- inset[2L]*(usr[4L] - usr[3L])
top <- switch(auto, "bottomright"=,
"bottom"=, "bottomleft"= usr[3L] + h + insety,
"topleft"=, "top"=, "topright" = usr[4L] - insety,
"left"=, "right"=, "center" = (usr[3L] + usr[4L] + h)/2)
}
}
if (plot && bty != "n") { ## The legend box :
if(trace > 0)
catn(" rect2(",left,",",top,", w=",w,", h=",h,", ...)",sep="")
rect2(left, top, dx = w, dy = h, col = bg, density = NULL,
lwd = box.lwd, lty = box.lty, border = box.col)
}
## (xt[],yt[]) := `current' vectors of (x/y) legend text
xt <- left + xchar + xextra +
(w0 * rep.int(0:(ncol-1), rep.int(n.legpercol,ncol)))[1L:n.leg]
yt <- top - 0.5 * yextra - ymax -
(rep.int(1L:n.legpercol,ncol)[1L:n.leg] - 1 + !is.null(title)) * ychar
if (mfill) { #- draw filled boxes -------------
if(plot) {
if(!is.null(fill)) fill <- rep_len(fill, n.leg)
rect2(left = xt, top=yt+ybox/2, dx = xbox, dy = ybox,
col = fill,
density = density, angle = angle, border = border)
}
xt <- xt + dx.fill
}
if(plot && (has.pch || do.lines))
col <- rep_len(col, n.leg)
## NULL is not documented but people use it.
if(missing(lwd) || is.null(lwd))
lwd <- par("lwd") # = default for pt.lwd
if (do.lines) { #- draw lines ---------------------
## NULL is not documented
if(missing(lty) || is.null(lty)) lty <- 1
lty <- rep_len(lty, n.leg)
lwd <- rep_len(lwd, n.leg)
ok.l <- !is.na(lty) & (is.character(lty) | lty > 0) & !is.na(lwd)
if(trace > 0)
catn(" segments2(",xt[ok.l] + x.off*xchar, ",", yt[ok.l],
", dx=", seg.len*xchar, ", dy=0, ...)")
if(plot) {
# TODO vert handling could be simplified
xs <- xt[ok.l] + x.off * xchar
vert <- as.logical(recycle(vert, xt))
dx <- as.numeric(!vert) * seg.len * xchar
strheight <- strheight("A", cex=cex)
ys <- yt[ok.l] - as.numeric(vert) * .9 * strheight
dy <- as.numeric(vert) * 1.6 * strheight
# stagger consecutive vertical lines
shifted <- FALSE
for(i in seq_along(vert)) {
if(vert[i]) {
if(shifted) {
shifted <- FALSE
xs[i] <- xs[i] + .75 * seg.len * xchar
} else {
shifted <- TRUE
xs[i] <- xs[i] + .5 * seg.len * xchar
}
} else
shifted <- FALSE
}
segments2(xs, ys, dx = dx, dy = dy,
lty = lty[ok.l], lwd = lwd[ok.l], col = col[ok.l])
}
# if (!merge)
xt <- xt + (seg.len+x.off) * xchar
}
if (has.pch) { #- draw points -------------------
pch <- rep_len(pch, n.leg)
pt.bg <- rep_len(pt.bg, n.leg)
pt.cex<- rep_len(pt.cex, n.leg)
pt.lwd<- rep_len(pt.lwd, n.leg)
ok <- !is.na(pch)
if (!is.character(pch)) {
## R 2.x.y omitted pch < 0
ok <- ok & (pch >= 0 | pch <= -32)
} else {
## like points
ok <- ok & nzchar(pch)
}
x1 <- (if(merge && do.lines) xt-(seg.len/2)*xchar else xt)[ok]
y1 <- yt[ok]
if(trace > 0)
catn(" points2(", x1,",", y1,", pch=", pch[ok],", ...)")
if(plot)
points2(x1, y1, pch = pch[ok], col = col[ok],
cex = pt.cex[ok], bg = pt.bg[ok], lwd = pt.lwd[ok])
##D if (!merge) xt <- xt + dx.pch
}
xt <- xt + x.intersp * xchar
if(plot) {
if (!is.null(title))
text2(left + w*title.adj, top - ymax, labels = title,
adj = c(title.adj, 0), cex = cex, col = title.col)
text2(xt, yt, labels = legend, adj = adj, cex = cex,
col = text.col, font = text.font)
}
invisible(list(rect = list(w = w, h = h, left = left, top = top),
text = list(x = xt, y = yt)))
}
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