+ Dot_configuration cfg_up = shift_one (cfg, p, UP);
+ Dot_configuration cfg_down = shift_one (cfg, p, DOWN);
+
+ int b_up = dot_config_badness (cfg_up);
+ int b_down = dot_config_badness (cfg_down);
+
+ cfg = (b_up < b_down) ? cfg_up : cfg_down;
+ }
+}
+
+MAKE_SCHEME_CALLBACK(Dot_column, calc_positioning_done, 1);
+SCM
+Dot_column::calc_positioning_done (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+ vector<Grob*> dots
+ = extract_grob_array (me, "dots");
+
+ { /*
+ Trigger note collision resolution first, since that may kill off
+ dots when merging.
+ */
+ Grob *c = 0;
+ for (vsize i = dots.size (); i--;)
+ {
+ Grob *n = dots[i]->get_parent (Y_AXIS);
+ if (c)
+ c = n->common_refpoint (c, X_AXIS);
+ else
+ c = n;
+ }
+ for (vsize i = dots.size (); i--;)
+ {
+ Grob *n = dots[i]->get_parent (Y_AXIS);
+ n->relative_coordinate (c, X_AXIS);
+ }
+ }
+
+ vector_sort (dots, position_less);
+ for (vsize i = dots.size (); i--;)
+ if (!dots[i]->is_live ())
+ dots.erase (dots.begin () + i);
+
+ Dot_configuration cfg;
+ for (vsize i = 0;i < dots.size (); i++)
+ {
+ Dot_position dp;
+ dp.dot_ = dots[i];
+
+ Grob *note = dots[i]->get_parent (Y_AXIS);
+ if (note)