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rggplot2plotgraphset

What's the simplest way to add a rectangle or border around my venn diagram to represent the universal set?

I'm using the ggplot2 and ggVennDiagram packages. I have two sets "A" and "B" that are colored in and have white space behind them. I'm wondering if there is an easy way to simply add a rectangular border around the sets similar to box() when plotting a graph in R.

Solution

  • Taking an example from the ggVennDiagram help page, let's draw an example:

    library(ggVennDiagram)

x <- list(A = 1:5, B = 2:7, C  =3:6, D = 4:9)

ggVennDiagram(x)

    enter image description here

    To add a box around this, note that since it is actually a ggplot with the panel border removed, we can just add it back in

    ggVennDiagram(x) + theme(panel.border = element_rect(fill = NA),
                         plot.margin = margin(10, 10, 10, 10))

    enter image description here