I have the following heatmap generated in R using geom_tile
in the ggplot2
package.
# Dummy data
x <- LETTERS[1:5]
y <- paste0("var", seq(1,5))
data <- expand.grid(X=x, Y=y)
data$Z <- runif(25, 0, 5)
# Heatmap
ggplot(data, aes(X, Y, fill= Z))
geom_tile()
scale_fill_gradient(low = "green", high = "red")
Is there any way to draw a border around specific tiles only? For example, I would like to have a border around the cell in the top left hand corner (A:var5) and the cell in the centre (C:var3).
CodePudding user response:
You could do:
ggplot(data, aes(X, Y, fill= Z))
geom_tile()
geom_tile(data = data[c(13, 21),], fill = NA, color = "black", size = 2)
scale_fill_gradient(low = "green", high = "red")
CodePudding user response:
Here are two methods, depending on your needs:
- Subset the data you want to highlight and call again to
geom_tile()
for that subset, with different aesthetics:
p <- ggplot(data, aes(X, Y, fill= Z))
geom_tile()
scale_fill_gradient(low = "green", high = "red")
d <- data.frame(X=c("A","C"), Y=c("var5", "var3"))
dat <- merge(data, d)
p geom_tile(data=dat, aes(X,Y), fill="transparent", colour="black", size=1)
- Alternatively, you could just annotate the original with the coordinates for rectangles you'd like to highlight:
p annotate("rect", xmin=c(0.5, 2.5), xmax=c(1.5, 3.5), ymin=c(4.5,2.5), ymax=c(5.5,3.5), colour="black", fill="transparent", size=1)