lily/tie-column.cc

   1 /*
   2   tie-column.cc --  implement Tie_column
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "tie-column.hh"
  11 #include "group-interface.hh"
  12 #include "tie.hh"
  13 #include "directional-element-interface.hh"
  14 #include "note-head.hh"
  15
  16 Tie_column::Tie_column ()
  17 {
  18   set_elt_property ("ties", SCM_EOL);
  19   set_empty (X_AXIS);
  20   set_empty (Y_AXIS);
  21   set_elt_property ("transparent", SCM_BOOL_T);
  22 }
  23
  24 void
  25 Tie_column::add_tie (Tie *s)
  26 {
  27   Group_interface g (this, "ties");
  28   if (!g.count ())
  29     {
  30       set_bounds (LEFT, s->head (LEFT));
  31       set_bounds (RIGHT, s->head (RIGHT));
  32     }
  33
  34   group (this, "ties").add_element (s);
  35   s->add_dependency (this);
  36 }
  37
  38
  39 int
  40 tie_compare (Tie* const & s1,
  41              Tie* const & s2)
  42 {
  43   return sign (s1->position_f () - s2->position_f());
  44 }
  45
  46 /*
  47   See [Ross p. 138].
  48
  49
  50   In normal chord cases, the outer ties point outwards, and the
  51   direction of the rest is determined by their staff position.
  52
  53   Ross forgets about the tie that is *on* the middle staff line. We
  54   assume it goes UP. (TODO: make this settable) */
  55 void
  56 Tie_column::set_directions ()
  57 {
  58   Link_array<Tie> s =
  59     Group_interface__extract_elements (this, (Tie*)0, "ties");
  60
  61
  62   Direction d = directional_element (this).get ();
  63
  64   if (d)
  65     {
  66       for (int i = s.size (); i--;)
  67         directional_element (s[i]).set (d);
  68       return;
  69     }
  70
  71   if (s.size () == 1)
  72     {
  73       directional_element (s[0]).set (s[0]->get_default_dir ());
  74       return;
  75     }
  76
  77   s.sort (tie_compare);
  78   directional_element (s[0]).set (DOWN);
  79   s.del (0);
  80   directional_element (s.pop ()).set (UP);
  81
  82   for (int i=s.size(); i--; )
  83     {
  84       Real p = s[i]->position_f ();
  85       Direction d = (Direction) sign (p);
  86       if (!d)
  87         d = UP;
  88
  89       directional_element (s[i]).set (d);
  90     }
  91
  92 }
  93
  94 void
  95 Tie_column::do_post_processing ()
  96 {
  97   set_directions ();
  98 }