toplegend <- function(...) {
if (par("oma")[3]==0) {
x <- mean(par("usr")[1:2])
yy <- transform_coord(par("usr")[3:4], par("plt")[3:4])
y <- mean(c(yy[2], par("usr")[4]))
legend(x, y, xpd=NA, bty="n", xjust=0.5, yjust=0.5, ...)
} else {
g <- par("mfrow")
xx <- transform_coord(par("usr")[1:2], par("plt")[1:2])
yy <- transform_coord(par("usr")[3:4], par("plt")[3:4])
xxx <- transform_coord(xx, c(g[2]-1, g[2])/g[2])
yyy <- transform_coord(yy, c(g[1]-1, g[1])/g[1])
yyyy <- transform_coord(yyy, par("omd")[3:4])
legend(mean(xxx), mean(c(yyy[2], yyyy[2])), xpd=NA, bty="n", xjust=0.5, yjust=0.5, ...)
}
}
transform_coord <- function(x, p) {
ba <- (x[2]-x[1])/(p[2]-p[1])
a <- x[1]-p[1]*ba
b <- a + ba
c(a, b)
}
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