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 "rhythmic-head.hh"
  15
  16 Tie_column::Tie_column (SCM s)
  17   : Spanner (s)
  18 {
  19
  20 }
  21 void
  22 Tie_column::set_interface (Score_element*me)
  23 {
  24  me-> set_elt_property ("ties", SCM_EOL);
  25   me->set_extent_callback (0, X_AXIS);
  26   me->set_extent_callback (0, Y_AXIS);
  27 }
  28
  29 void
  30 Tie_column::add_tie (Score_element*me,Tie *s)
  31 {
  32   Pointer_group_interface g (me, "ties");
  33   if (!g.count ())
  34     {
  35       dynamic_cast<Spanner*> (me)->set_bound (LEFT, Tie::head (s,LEFT));
  36       dynamic_cast<Spanner*> (me)->set_bound (RIGHT, Tie::head (s,RIGHT));
  37     }
  38
  39   Pointer_group_interface (me, "ties").add_element (s);
  40   s->add_dependency (me);
  41 }
  42
  43
  44 int
  45 tie_compare (Tie* const & s1,
  46              Tie* const & s2)
  47 {
  48   return sign (Tie::position_f (s1) - Tie::position_f(s2));
  49 }
  50
  51 /*
  52   See [Ross p. 138].
  53
  54
  55   In normal chord cases, the outer ties point outwards, and the
  56   direction of the rest is determined by their staff position.
  57
  58   Ross forgets about the tie that is *on* the middle staff line. We
  59   assume it goes UP. (TODO: make me settable) */
  60 void
  61 Tie_column::set_directions (Score_element*me)
  62 {
  63   Link_array<Tie> ties =
  64     Pointer_group_interface__extract_elements (me, (Tie*)0, "ties");
  65
  66
  67   Direction d = Directional_element_interface (me).get ();
  68
  69   if (d)
  70     {
  71       for (int i = ties.size (); i--;)
  72         {
  73           Tie * t = ties[i];
  74           Directional_element_interface (t).set (d);
  75         }
  76       return;
  77     }
  78
  79   if (ties.size () == 1)
  80     {
  81       Tie * t = ties[0];
  82       Directional_element_interface (t).set (Tie::get_default_dir (t));
  83       return;
  84     }
  85
  86   ties.sort (tie_compare);
  87   Directional_element_interface tie0(ties[0]);
  88   tie0.set (DOWN);
  89   ties.del (0);
  90
  91   Directional_element_interface tietop(ties.pop ());
  92   tietop.set (UP);
  93
  94   for (int i=ties.size(); i--; )
  95     {
  96       Tie * t = ties[i];
  97       Real p = Tie::position_f (t);
  98       Direction d = (Direction) sign (p);
  99       if (!d)
 100         d = UP;
 101       Directional_element_interface (t).set (d);
 102     }
 103
 104 }
 105
 106 MAKE_SCHEME_CALLBACK(Tie_column,after_line_breaking);
 107 SCM
 108 Tie_column::after_line_breaking (SCM smob)
 109 {
 110   set_directions (unsmob_element (smob));
 111   return SCM_UNDEFINED;
 112 }