small optimization

nle_processing/sketch_NLE_CA/NLE_CA.pde

@@ -523,12 +523,12 @@ class NLE_CA extends CellularAutomaton {
       }
       else if (rndN < desn + pgroup) { // group movement: N <-> L
         find_groupsN();
-        int dir = int(random(dirs.ndirs()));
         int label = gN[c.x][c.y];
-        if (may_move_group_NL(label,dir)) {
-          int size = gsN[label];
-          float p = 1.0/size;
-          if (random(1.0) < p) {
+        int size = gsN[label];
+        float p = 1.0/size;
+        if (random(1.0) < p) {
+          int dir = int(random(dirs.ndirs()));
+          if (may_move_group_NL(label,dir)) {
             do_move_group_NL(label,dir);
             moved_nlg += size;
           }