Nothing
# print an underlined label in the plot.
underlined = function(x, y, label, col){
text(x, y, label, col = col, font = 2)
sw = strwidth(label)
sh = strheight(label)
lines(x + c(-sw/2, sw/2), rep(y - 1.5*sh/2, 2), col = col)
}#UNDERLINED
# compute the largest possible expansion factor for which a string fits the box.
largest.cex = function(node, height, width, hfrac = 0.7, wfrac = 0.9) {
# fit vertically.
guess = hfrac * height / strheight(node, cex = 1)
best = optimize(f = function(x) abs(strheight(node, cex = x) - hfrac * height),
interval = guess * c(0.5, 2), tol = 0.025)$minimum
# fit horizonally.
best = best * min(wfrac * width / strwidth(node, cex = best), 1)
return(best)
}#LARGEST.CEX
# created a lighter tint of a given colour.
lighter.colour = function(col, offset = 0.25) {
rgb = col2rgb(col)[, 1]
do.call("rgb", as.list((rgb + (255 - rgb) * offset) / 255))
}#LIGHTER.COLOUR
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