Basic area chart with plot() and polygon()
Base R also allows to build area charts thanks to the
polygon() function. This function requires 2 inputs:
x and y.
Note that extreme values of both are added at the beginning and at the end of each vectors to make sure the polygon is closed.
# Create data
data <- data.frame(x=seq(1,10), y=sample(seq(1,15),10))
# Draw line on top
plot(data, col=rgb(0.2,0.1,0.5,0.9), type="o", lwd=3, xlab="", ylab="size",
pch=20)
# Fill the area
polygon(c(min(data$x), data$x, max(data$x)),
c(min(data$y), data$y, min(data$y)),
col=rgb(0.2,0.1,0.5,0.2), border=FALSE)
