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A graph drawing algorithm produces a layout of a graph in two- or three-dimensional space that should be readable and easy to understand.
Since the aesthetic criteria differ from one application area to another,
it is unlikely that a definition of the ``optimal drawing'' of a graph in
a strict mathematical sense exists. A large number of graph drawing algorithms
taking different aesthetic criteria into account have already been proposed.
In this paper we describe the design and implementation of the AGD--Library,
a library of {\bf A}lgorithms for {\bf G}raph {\bf D}rawing. The library
offers a broad range of existing algorithms for two-dimensional graph drawing
and tools for implementing new algorithms. The library is written in \CC using
the LEDA platform for combinatorial and geometric computing
(\cite{Mehlhorn-Naeher:CACM,LEDA-Manual}).
The algorithms are implemented independently of the underlying visualization
or graphics system by using a generic layout interface.
Most graph drawing algorithms place a set of restrictions on the
input graphs like planarity or biconnectivity. We provide a mechanism
for declaring this precondition for a particular algorithm and
checking it for potential input graphs. A drawing model can be
characterized by a set of properties of the drawing. We call these properties
the postcondition of the algorithm. There is support
for maintaining and retrieving the postcondition of an algorithm.
