This processor computes the fundamental diagram by computing at a certain time the density and the velocity defined by the Voronoi-diagram where the points are the pedestrian positions. The density is equal to the sum of areas of all Voronoi-cells intersecting the measurementArea divided by the area of the measurementArea. The velocity of a pedestrian is defined by its velocity times the area of its Voronoi-cell. Therefore the velocity is the sum of all those pedestrian velocities of Voronoi-cells intersecting the measurementArea divided by the measurementArea.
For more details see zhang-2011 (doi:10.1088/1742-5468/2011/06/P06004) Method D.
@author Benedikt Zoennchen---
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