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This report describes the ‘gggrid’ package, which provides a convenient interface for making use of raw ‘grid’ functions in combination with ‘ggplot2’.

The ‘gggrid’ package provides two functions, grid_panel() and grid_group(), both of which create a new layer in a ‘ggplot2’ plot. The first argument to both functions is a ‘grid’ grob or a function that generates a grob and that grob is added to the plot region of the ‘ggplot2’ plot.

For example, the following code adds a rectangle filled with a semitransparent radial gradient to a ‘ggplot2’ plot.

library(gggrid)
ggplot(mtcars) +
geom_point(aes(disp, mpg)) +


Paul Murrell