z-scale for smoothScatter() function

smoothScatter() plots irregular 2D data with level of colors. However it does not show the z-scale. Here is a way to plot a z-scale:

library(graphics)
library(fields)

n <- 10000
x  <- matrix(rnorm(n), ncol = 2)
y  <- matrix(rnorm(n, mean = 3, sd = 1.5), ncol = 2)

# dans x, les coordonnées x
# dans y, les coordonnées y
par(mar=c(4, 4, 2, 6)+0.4)


smoothScatter(x, y)

n <- matrix(0, ncol=128, nrow=128)

xrange <- range(x)
yrange <- range(y)

for (i in 1:length(x)) {
  posx <- 1+floor(127*(x[i]-xrange[1])/(xrange[2]-xrange[1]))
  posy <- 1+floor(127*(y[i]-yrange[1])/(yrange[2]-yrange[1]))
  n[posx, posy] <- n[posx, posy]+1
}

image.plot( legend.only=TRUE, zlim= c(0, max(n)), nlevel=128, col=colorRampPalette(c("white", blues9))(128))


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