Draw multiple squares with ggplot

ggplot2, r

Solution

A variant on your answer, if you want the "background" colors to go all the way to the edge of the graph and not just to the extremes of the data:

ggplot(df) +
  geom_rect(xmin = -Inf, xmax = 0,   ymin = -Inf, ymax = 0,   fill = "red") +
  geom_rect(xmin = 0,    xmax = Inf, ymin = -Inf, ymax = 0,   fill = "blue") +
  geom_rect(xmin = 0,    xmax = Inf, ymin = 0,    ymax = Inf, fill = "green") +
  geom_rect(xmin = -Inf, xmax = 0,   ymin = 0,    ymax = Inf, fill = "yellow") +
  geom_point(aes(x, y), size = 5)

EDIT: transparency

Adding `alpha=0.5` was "working" except for the problem that by using `geom_rect`, even without referencing the original `df` data frame, drew a rectangle for each row of `df` (10 times, in this case). Setting `alpha=0.01` shows that there is transparency, but at a 10th the expected level. The approach should have been to annotate with rectangles; annotations draw only a single instance of the geom, not one per row of the original data frame:

ggplot(df) +
  annotate("rect", xmin=-Inf, xmax=0, ymin=-Inf, ymax=0, fill="red", alpha=0.5) +
  annotate("rect", xmin=0, xmax=Inf, ymin=-Inf, ymax=0, fill="blue", alpha=0.5) +
  annotate("rect", xmin=0, xmax=Inf, ymin=0, ymax=Inf, fill="green", alpha=0.5) +
  annotate("rect", xmin=-Inf, xmax=0, ymin=0, ymax=Inf, fill="yellow", alpha=0.5) +
  geom_point(aes(x, y), size=5)

Problem

I am trying to change to 'background' color of a ggplot. What I want to achieve is the plot shown below. I've already tried it with geom_ribbon but than I can only define ymin and ymax. This allows me to only create two squares. The code I use so far: ``` df <- data.frame(x = rnorm(10), y = rnorm(10)) ggplot(df) + geom_point(aes(x, y)) + geom_ribbon(aes(x = x, ymin = min(y), ymax = 0), fill = "red", alpha = .5) + geom_ribbon(aes(x = x, ymin = min(0), ymax = max(y)), fill = "blue", alpha = .5) ``` And this is the result I want to get: Thanks for your time.

Original source