ggplot_build takes the plot object, and performs all steps necessary to produce an object that can be rendered. This function outputs two pieces: a list of data frames (one for each layer), and a panel object, which contain all information about axis limits, breaks etc.


layer_data(plot, i = 1L)

layer_scales(plot, i = 1L, j = 1L)

layer_grob(plot, i = 1L)



ggplot object


layer_data, layer_grob, and layer_scales are helper functions that returns the data, grob, or scales associated with a given layer. These are useful for tests.

See also

print.ggplot() and benchplot() for functions that contain the complete set of steps for generating a ggplot2 plot.