private void initDiagram() {
        mVoronoi = new Voronoi(mDistanceBetweenSites);
    }
Callback method to be invoked when a region in this VoronoiView has
been clicked.

@param view     The region view which was clicked
@param position The position of the region
vorolay/src/main/java/quatja/com/vorolay/VoronoiView.java