Abstract
A graphical scene that has been pro- duced using the grid graphics package consists of grobs (graphical objects) and viewports. This article describes functions that allow the explo- ration and inspection of the grobs and viewports in a grid scene, including several functions that are available in a new package called gridDe- bug. The ability to explore the grobs and view- ports in a grid scene is useful for adding more drawing to a scene that was produced using grid and for understanding and debugging the grid code that produced a scene.
Highlights
When a scene has been generated by someone else’s code, for example, a call to a lattice plotting function, it may not be very easy to determine the name of a viewport or grob.1
The grid graphics package for R contains features that are intended to assist in the creation of flexible, complex graphical scenes, such as the plots that are produced by lattice (Sarkar, 2008) and ggplot2 (Wickham, 2009)
This article has described several tools that assist with the debugging of grid graphics code, whether that is trying to understand someone else’s code, trying to understand your own code, or trying to ex
Summary
When a scene has been generated by someone else’s code, for example, a call to a lattice plotting function, it may not be very easy to determine the name of a viewport or grob.1 This article describes a number of functions that are provided by the grid package and the gridDebug package (Murrell and Ly, 2011) to help identify what viewports and grobs have been used to create a scene and track exactly where each viewport and grob has been drawn on the page.
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