Voronoi Vertex</h1>
A Voronoi vertex represents a point, that is equidistant from the three
or more input geometries. As a consequence, it corresponds to the point
of the intersection of the three or more Voronoi edges. On the image
below, there are 5 such vertices: A, B, C, D, E. The Voronoi vertex
data structure embeds the coordinates of the underlying point and
provides access to a random Voronoi edge originating from the vertex
(e.g. edge
BC for the vertex B).<br>
      <img style="width: 600px; height: