R on ggplot_gtable and ggplot_build

Question

I seem to have come across the ggplot_gtable(ggplot_build(graph)) commands many times these days when I am exploring how to change the ggplot graph in a certain way.

For example, how to add a data table to a graph or how to superimpose two graphs or How to add a row to a graph outside the graph area

I would like to know more, and I understand that the commands are part of the basic ggplot2 package, but I can not find anything in the documents or my search queries. Does anyone know where I can find additional information about these commands and the tree structure of the list being created?

thanks

Answer 1

Perhaps these links will help you:

ggplot2 documentation

ggplot_gtable documentation

And a few ggplot examples