get plot data
process_data(venn, nsets = NULL, shape_id = NULL, type = NULL)
# S4 method for class 'Venn'
process_data(venn, nsets = length(venn@sets), shape_id = NULL, type = NULL)
This function will conduct set operations and combine the outputs will stored shapes, thus produce a dataset for plot in next step.
Run `get_shapes()` to show all the characteristics of available shapes. Run `plot_shapes()` to view those shapes.