void CFruchtermanReingold::calculate_coordinates() {
       CalculateForces();
       for(int i = 0; i < vgc_nodes_num; ++i) {
              if(!vgc_graph->vertice_exists(i)) continue;
              QVector2D delta = vgc_vertices[i].v_force * NODE_MASS * TIME_DELTA * TIME_DELTA;
              vgc_vertices[i].v_coordinates += delta.toPoint() * std::min(delta.length(), (double)vgc_temperature) / delta.length();
       }
       Cool();
}