Coordinate Systems

grid is not a set of high-level plotting functions. It is a set of low-level graphics functions and is intended to provide facilities for producing complete plots with only a moderate amount of code and a trivial amount of mental effort. Other packages (such as lattice) can be written using grid to provide high-level plotting functions for more convenient production of complete plots. Ideally these should still allow a great deal of annotation and customisation via raw grid functions. The structure of this document deliberately mirrors the structure of the document “Traditional S Graphics ” in order to help the transition from standard R graphics to grid. There are three things to know in order to construct a statistical graphic (plot): 1. How to create and control different graphics regions and coordinate systems. 2. How to control which graphics region and coordinate system graphics output goes into. 3. How to produce graphics output (lines, points, text,...) including how to control its appear-ance (colour, line type, line width,...)