This class is no longer in use.
The TimeCostDensityVoronoi measures the density by generating an
jts-diagram for the whole area of the scenario. This has a complexity of
O(N*log(N)) for each computation. We count the pedestrians and the area size
of all jts-regions in an specific area. D = N * (min possilbe jts
area) /(sum of all jts cell areas) for those jts cell who's site is
inside the measurement area (a square).
This is only working if no obstacles inside the area of the
jts-diagram!!!