lily/note-column.cc

   1 /*
   2   note-column.cc -- implement Note_column
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include <math.h>               // ceil
   9
  10 #include "axis-group-interface.hh"
  11 #include "note-column.hh"
  12 #include "stem.hh"
  13 #include "warn.hh"
  14 #include "paper-def.hh"
  15 #include "group-interface.hh"
  16 #include "staff-symbol-referencer.hh"
  17 #include "rest.hh"
  18 #include "note-head.hh"
  19 #include "accidental-placement.hh"
  20
  21 /*
  22   TODO: figure out if we can prune this class. This is just an
  23   annoying layer between (rest)collision & (note-head + stem)
  24  */
  25
  26 bool
  27 Note_column::has_rests (Grob*me)
  28 {
  29   return unsmob_grob (me->get_property ("rest"));
  30 }
  31
  32 int
  33 Note_column::shift_compare (Grob *const &p1, Grob *const&p2)
  34 {
  35   SCM s1 = p1->get_property ("horizontal-shift");
  36   SCM s2 = p2->get_property ("horizontal-shift");
  37
  38   int h1 = (gh_number_p (s1))?  gh_scm2int (s1) :0;
  39   int h2 = (gh_number_p (s2)) ? gh_scm2int (s2):0;
  40   return h1 - h2;
  41 }
  42
  43 Item *
  44 Note_column::get_stem (Grob*me)
  45 {
  46   SCM s = me->get_property ("stem");
  47   return  unsmob_item (s);
  48 }
  49
  50 Slice
  51 Note_column::head_positions_interval (Grob *me)
  52 {
  53   Slice  iv;
  54
  55   iv.set_empty ();
  56
  57   SCM h = me->get_property ("note-heads");
  58   for (; gh_pair_p (h); h = ly_cdr (h))
  59     {
  60       Grob *se = unsmob_grob (ly_car (h));
  61
  62       int j = Staff_symbol_referencer::get_rounded_position (se);
  63       iv.unite (Slice (j,j));
  64     }
  65   return iv;
  66 }
  67
  68 Direction
  69 Note_column::dir (Grob*  me)
  70 {
  71   Grob *stem = unsmob_grob (me->get_property ("stem"));
  72   if (stem && Stem::has_interface (stem))
  73     return Stem::get_direction (stem);
  74   else if (gh_pair_p (me->get_property ("note-heads")))
  75     return (Direction)sign (head_positions_interval (me).center ());
  76
  77   programming_error ("Note column without heads and stem!");
  78   return CENTER;
  79 }
  80
  81
  82 void
  83 Note_column::set_stem (Grob*me,Grob * stem)
  84 {
  85   me->set_property ("stem", stem->self_scm ());
  86   me->add_dependency (stem);
  87   Axis_group_interface::add_element (me, stem);
  88 }
  89
  90
  91 Grob*
  92 Note_column::get_rest (Grob*me)
  93 {
  94   return unsmob_grob (me->get_property ("rest"));
  95 }
  96
  97 void
  98 Note_column::add_head (Grob*me,Grob *h)
  99 {
 100   bool both = false;
 101   if (Rest::has_interface (h))
 102     {
 103       if (gh_pair_p (me->get_property ("note-heads")))
 104         both = true;
 105       else
 106         me->set_property ("rest", h->self_scm ());
 107     }
 108   else if (Note_head::has_interface (h))
 109     {
 110       if (unsmob_grob (me->get_property ("rest")))
 111         both = true;
 112       Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-heads"),h);
 113     }
 114
 115   if (both)
 116     me->warning ("Can't have rests and note heads together on a stem.");
 117   else
 118     Axis_group_interface::add_element (me, h);
 119 }
 120
 121 /**
 122   translate the rest symbols vertically by amount DY, but only if
 123   they have no staff-position set.
 124 */
 125 void
 126 Note_column::translate_rests (Grob*me, int dy)
 127 {
 128   Grob * r = unsmob_grob (me->get_property ("rest"));
 129   if (r && !gh_number_p (r->get_property ("staff-position")))
 130     {
 131       r->translate_axis (dy * Staff_symbol_referencer::staff_space (r)/2.0, Y_AXIS);
 132     }
 133 }
 134
 135
 136 void
 137 Note_column::set_dotcol (Grob*me,Grob *d)
 138 {
 139   Axis_group_interface::add_element (me, d);
 140 }
 141
 142
 143
 144
 145 Grob*
 146 Note_column::first_head (Grob*me)
 147 {
 148   Grob * st = get_stem (me);
 149   return st?  Stem::first_head (st): 0;
 150 }
 151
 152
 153 /*
 154   Return the first Accidentals grob that we find in a note-head.
 155  */
 156 Grob*
 157 Note_column::accidentals (Grob *me)
 158 {
 159   SCM heads = me->get_property ("note-heads");
 160   Grob * acc = 0;
 161   for (;gh_pair_p (heads); heads =gh_cdr (heads))
 162     {
 163       Grob * h = unsmob_grob (gh_car (heads));
 164       acc = h ? unsmob_grob (h->get_property ("accidental-grob")) : 0;
 165       if (acc)
 166         break;
 167     }
 168
 169   if (!acc)
 170     return 0;
 171
 172   if (Accidental_placement::has_interface (acc->get_parent (X_AXIS)))
 173     return acc->get_parent (X_AXIS);
 174
 175   /* compatibility. */
 176   return  acc;
 177 }
 178
 179
 180
 181 ADD_INTERFACE (Note_column,"note-column-interface",
 182   "Stem and noteheads combined",
 183   "arpeggio note-heads rest-collision rest horizontal-shift stem accidentals force-hshift");
 184