\subsection{Layout of Graphs}

Layout algorithms assign coordinate in the world coordinate system
(0.0, 0.0) to (1.0, 1.0).  The following are selectable from the
{\em Layout} menu of each graph view:

\begin{itemize}
\item {\em Circular} The vertices are laid out in a circle.
\item {\em Component}The user is prompted for two layout algorithms
		     (chosen from this list minus {\em Component}):
		     an algorithm with which to layout the {\em component
		     graph}, i.e. the graph obtained by collapsing each
		     component into a single vertex, and an algorithm
		     with which to layout each component.
\item {\em Grid}     The user is prompted for the numbers of rows, and
		     columns, then the graph is laid out in a rectangular
		     grid.
\item {\em Random}   The vertices are given random locations (NOTE: STk
		     uses Unix rand(), which is not very random (7/19/96)).
\item {\em Spring}   The vertices are laid out according to forces calculated
		     so that edges act like rubber bands. CITE?
\end{itemize}
