lily/cross-staff.cc

   1 #include "cross-staff.hh"
   2 #include "item.hh"
   3 #include "align-element.hh"
   4 #include "spanner.hh"
   5 #include "warn.hh"
   6
   7 Real
   8 calc_interstaff_dist (Item const *item, Spanner const *span)
   9 {
  10   Real interstaff = 0.0;
  11   Score_element *common = item->common_refpoint (span, Y_AXIS);
  12   Align_element * align = dynamic_cast<Align_element*> (common);
  13   if (align && align->axis() == Y_AXIS)
  14     {
  15       if (align->threshold_interval_[MIN] !=
  16           align->threshold_interval_[MAX])
  17         warning (_ ("minVerticalAlign != maxVerticalAlign: cross staff spanners may be broken"));
  18
  19       interstaff = align->threshold_interval_[MIN];
  20
  21       Score_element const * span_refpoint = span;
  22       while (span_refpoint->parent_l  (Y_AXIS) != common)
  23         span_refpoint = span_refpoint->parent_l (Y_AXIS);
  24
  25       Score_element const * note_refpoint = item;
  26       while (note_refpoint->parent_l (Y_AXIS) != common)
  27         note_refpoint = note_refpoint->parent_l (Y_AXIS);
  28
  29       int span_prio =
  30         align->get_count ((Score_element*) dynamic_cast<Score_element const*> (span_refpoint));
  31       int item_prio =
  32         align->get_count ((Score_element*) dynamic_cast<Score_element  const *> (note_refpoint));
  33
  34       /*
  35         our staff is lower -> interstaff *= -1
  36        */
  37
  38       if (span_prio < item_prio)
  39         interstaff *= -1;
  40       return interstaff;
  41     }
  42   else return 0.0;
  43 }
  44