- Grob *neighbour = mother->broken_intos_[i];
- Offset neighbour_o = get_broken_offset (neighbour, dir);
- Offset me_o = get_broken_offset (me, -dir);
- // Hmm, why not return me_o[X], but recalc in brew_mol?
- o = Offset (0,
- (neighbour_o[Y_AXIS]*me_o[X_AXIS]
- - me_o[Y_AXIS]*neighbour_o[X_AXIS]) * dir /
- (me_o[X_AXIS] + neighbour_o[X_AXIS]));
- break;
+ programming_error ("no note heads for the line spanner on neighbor line?"
+ " Confused.");
+ me->suicide ();
+ return SCM_EOL;
+ }
+
+ Spanner *next_bound_parent = parent_spanner (next_bound);
+ Interval next_ext = next_bound->extent (next_bound_parent, Y_AXIS);
+
+ /* We want to know what would be the
+ y-position of the next bound (relative to my y-parent) if it belonged
+ to the same system as this bound. We rely on the fact that
+ the y-parent of the next bound is a spanner (probably the
+ VerticalAxisGroup of a staff) that extends over the break.
+ */
+ Spanner *next_bound_parent_on_this_line =
+ next_bound_parent->broken_neighbor (other_dir (dir));
+
+ if (next_bound_parent_on_this_line)
+ {
+ Grob *common = me->common_refpoint (next_bound_parent_on_this_line, Y_AXIS);
+ Real bound_offset = next_bound_parent_on_this_line->relative_coordinate (common, Y_AXIS);
+ y = next_ext.center () + bound_offset - me->relative_coordinate (common, Y_AXIS);
+ }
+ else
+ {
+ /* We fall back to assuming that the distance between staves doesn't
+ change over line breaks. */
+ programming_error ("next-bound's parent doesn't extend to this line");
+ Grob *next_system = next_bound->get_system ();
+ Grob *this_system = me->get_system ();
+ y = next_ext.center () + next_bound_parent->relative_coordinate (next_system, Y_AXIS)
+ - me->relative_coordinate (this_system, Y_AXIS);