a postscript driver with many plotting commands. It is possible to work with these low level routines directly if you're familiar with the postcript language. This class is not documented and you need to look into the source file in order to use it.
2d figure class for creating 2D graphs. There are several attributes corresponding to the the building blocks of figures. All are modifiable. If you want to improve them you can look through the source file.
3d figure class. Draw 2d surfaces and 1d curves in space.
creating bar graphs given a set of data.
creating pie charts given a set of percentages.