filled.contour vs. ggplot2 + stat_contour

Question

I am new to ggplot2, and I am trying to replicate a graph that I created using filled.contour with ggplot2.

below is my code:

require(gg         


        

Answer 1

To create a ggplot version of the filled.contour plot you'll need to have a larger data.frame than the df object in your example and using geom_tile will produce the plot you are looking for. Consider the following:

# a larger data set
scl <- 10
dat <- expand.grid(x = scl * seq(0, 1, by = 0.01), 
                   y = scl * seq(0, 1, by = 0.01))
dat$z <- ((scl - dat$x) * dat$y) / ((scl - dat$x) * dat$y + 1)

# create the plot, the geom_contour may not be needed, but I find it helpful
ggplot(dat) + 
aes(x = x, y = y, z = z, fill = z) + 
geom_tile() + 
geom_contour(color = "white", alpha = 0.5) + 
scale_fill_gradient(low = "lightblue", high = "magenta") + 
theme_bw()