ionMap drawing,
                                         VertexIndexMap vm
                                         );
</pre>

<br>
<p>
A <i>straight line drawing</i> of a <a href="./planar_graphs.html#planar">
planar graph</a> is a <a href="./planar_graphs.html#plane_drawing">plane 
drawing</a> where each edge is drawn using a straight line segment. Since all 
edges are line segments, the drawing is completely determined by the placement 
of vertices in the plane. <tt>chrobak_payne_straight_line_drawing</t