X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=moebius2.git;a=blobdiff_plain;f=graph.c;h=f0ce19db99fe08a1d2a0d82ab2f1746db1bae483;hp=c9cdd2cd773670cbeaef05d846c02b1f88a8a123;hb=289edb461ff46150a66983e290438a725505d261;hpb=2377b968f55ddd5d6a8ff79ee9150316a218afc8

diff --git a/graph.c b/graph.c
index c9cdd2c..f0ce19d 100644
--- a/graph.c
+++ b/graph.c
@@ -35,6 +35,9 @@ static void breadth_first_search(int start, int sqdistances_r[N]) {
     assert(d[v] >= 0);
     sqdistances_r[v]= d[v] * d[v];
   }
+
+//  FOR_VERTEX(v) {
+//    
 }
 
 void graph_layout_prepare() {
@@ -44,13 +47,13 @@ void graph_layout_prepare() {
     breadth_first_search(v1, sqdistances[v1]);
 
   alpha= 2;
-  beta= -log(10)/log(alpha);
+  beta= log(10)/log(alpha);
   beta_prime= (1-beta)/2;
   printf("alpha=%g beta=%g beta'=%g\n", alpha,beta,beta_prime);
 }
 
 
-double graph_layout_cost(const Vertices v, const double vertex_areas[N]) {
+double graph_layout_cost(const Vertices v) {
   /* For each (vi,vj) computes shortest path s_ij = |vi..vj|
    * along edges, and actual distance d_ij = |vi-vj|.
    *
@@ -69,7 +72,6 @@ double graph_layout_cost(const Vertices v, const double vertex_areas[N]) {
    */
   //static const double d2_epsilon= 1e-6;
 
-  //  double edge_weights[V6<<ESHIFT], vertex_distances[N],
   double total_cost=0;
   int v1,v2,e, nedges=0;
   double totaledgelength=0, meanedgelength, meanedgelength2;
@@ -94,23 +96,18 @@ double graph_layout_cost(const Vertices v, const double vertex_areas[N]) {
 
       double s2= dist2 * meanedgelength2;
 
-      /* energy = (d/s)^(1-beta)     where beta is -log\_{alpha}(10)
+      /* energy = (d/s)^(1-beta)     where beta is log\_{alpha}(10)
        * energy = ((d/s)^2) ^ (1-beta)/2
        *          let beta' = (1-beta)/2
        */
 
-      double cost= pow(d2/s2, beta_prime);
+      double cost= (vertex_mean_edge_lengths[v1]) * pow(d2/s2, beta_prime);
       
-      //double s2= s*s + d2_epsilon;
-      //double sd2= s2 / d2;
-      //double cost_contrib= a1*a2 * (sd2 - 1) / (d2*d2);
-      //double cost_contrib= sd2;
-
       //printf("layout %03x..%03x dist^2=%d s^2=%g d^2=%g "
       	       //" cost+=%g\n", v1,v2, dist2,
 	       //	     s2,d2, cost);
       total_cost += cost;
     }
   }
-  return total_cost;
+  return total_cost/meanedgelength;
 }