double compute_energy(const struct Vertices *vs);
-double graph_layout_cost(const Vertices v, const double vertex_areas[N]);
+double graph_layout_cost(const Vertices v);
void graph_layout_prepare();
+void compute_vertex_areas(const Vertices vertices);
+void compute_edge_lengths(const Vertices vertices);
+extern double vertex_areas[N], vertex_mean_edge_lengths[N], edge_lengths[N][V6];
+
double noncircular_rim_cost(const Vertices vertices);
double edgewise_vertex_displacement_cost(const Vertices vertices);
+double edge_length_variation_cost(const Vertices vertices);
extern const char *input_file, *output_file;
extern char *output_file_tmp;