The PyX package is split in several modules, which can be
categorised in the following groups
basic graphics functionality & canvas, path, deco, style, color,
and connector
text output via TEX/LATEX & text and box
linear transformations and units & trafo and unit
graph plotting functionality & graph (including submodules)
and graph.axis (including submodules)
EPS file inclusion & epsfile
These modules (and some other less import ones) are imported into the
module namespace by using
at the beginning of the Python program. However, in order to prevent
namespace pollution, you may also simply use "import pyx".
Throughout this manual, we shall always assume the presence of the
above given import line.a
