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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include <math.h>               // ceil
   9
  10 #include "axis-group-interface.hh"
  11 #include "dot-column.hh"
  12 #include "note-column.hh"
  13 #include "beam.hh"
  14 #include "note-head.hh"
  15 #include "stem.hh"
  16 #include "rest.hh"
  17 #include "debug.hh"
  18 #include "paper-def.hh"
  19 #include "group-interface.hh"
  20 #include "staff-symbol-referencer.hh"
  21
  22 bool
  23 Note_column::rest_b () const
  24 {
  25   SCM r = get_elt_pointer ("rests");
  26
  27   return gh_pair_p (r);
  28 }
  29
  30 int
  31 Note_column::shift_compare (Note_column *const &p1, Note_column*const&p2)
  32 {
  33   SCM s1 = p1->get_elt_property ("horizontal-shift");
  34   SCM s2 = p2->get_elt_property ("horizontal-shift");
  35
  36   int h1 = (gh_number_p (s1))?  gh_scm2int (s1) :0;
  37   int h2 = (gh_number_p (s2)) ? gh_scm2int (s2):0;
  38   return h1 - h2;
  39 }
  40
  41 Note_column::Note_column( SCM s)
  42   : Item (s)
  43 {
  44   set_elt_pointer ("rests", SCM_EOL);
  45   set_elt_pointer ("note-heads", SCM_EOL);
  46   Axis_group_interface (this).set_interface ();
  47   Axis_group_interface (this).set_axes (X_AXIS, Y_AXIS);
  48   Group_interface (this, "interfaces").add_thing (ly_symbol2scm ("Note_column"));
  49 }
  50
  51 Stem *
  52 Note_column::stem_l () const
  53 {
  54   SCM s = get_elt_pointer ("stem");
  55   return dynamic_cast<Stem*> (unsmob_element (s));
  56
  57 }
  58
  59
  60 Slice
  61 Note_column::head_positions_interval() const
  62 {
  63   Slice  iv;
  64
  65   iv.set_empty ();
  66
  67   SCM h = get_elt_pointer ("note-heads");
  68   for (; gh_pair_p (h); h = gh_cdr (h))
  69     {
  70       Score_element *se = unsmob_element (gh_car (h));
  71       Staff_symbol_referencer_interface si (se);
  72
  73       int j = int (si.position_f ());
  74       iv.unite (Slice (j,j));
  75     }
  76   return iv;
  77 }
  78
  79 Direction
  80 Note_column::dir () const
  81 {
  82   if (stem_l ())
  83     return stem_l ()->get_direction ();
  84   else if (gh_pair_p (get_elt_pointer ("note-heads")))
  85     return (Direction)sign (head_positions_interval().center ());
  86
  87   programming_error ("Note column without heads and stem!");
  88   return CENTER;
  89 }
  90
  91
  92 void
  93 Note_column::set_stem (Stem * stem_l)
  94 {
  95   set_elt_pointer ("stem", stem_l->self_scm_);
  96
  97   add_dependency (stem_l);
  98   Axis_group_interface (this).add_element (stem_l);
  99 }
 100
 101
 102
 103 void
 104 Note_column::add_head (Rhythmic_head *h)
 105 {
 106   if (Rest*r=dynamic_cast<Rest *> (h))
 107     {
 108       Pointer_group_interface gi (this, "rests");
 109       gi.add_element (h);
 110     }
 111   if (Note_head *nh=dynamic_cast<Note_head *> (h))
 112     {
 113       Pointer_group_interface gi (this, "note-heads");
 114       gi.add_element (nh);
 115     }
 116   Axis_group_interface (this).add_element (h);
 117 }
 118
 119 /**
 120   translate the rest symbols vertically by amount DY_I.
 121  */
 122 void
 123 Note_column::translate_rests (int dy_i)
 124 {
 125   SCM s = get_elt_pointer ("rests");
 126   for (; gh_pair_p (s); s = gh_cdr (s))
 127     {
 128       Score_element * se = unsmob_element (gh_car (s));
 129       Staff_symbol_referencer_interface si (se);
 130
 131       se->translate_axis (dy_i * si.staff_space ()/2.0, Y_AXIS);
 132     }
 133 }
 134
 135
 136 void
 137 Note_column::set_dotcol (Dot_column *d)
 138 {
 139   Axis_group_interface (this).add_element (d);
 140 }
 141
 142 /*
 143   [TODO]
 144   handle rest under beam (do_post: beams are calculated now)
 145   what about combination of collisions and rest under beam.
 146
 147   Should lookup
 148
 149     rest -> stem -> beam -> interpolate_y_position ()
 150 */
 151
 152 GLUE_SCORE_ELEMENT(Note_column,after_line_breaking);
 153 SCM
 154 Note_column::member_after_line_breaking ()
 155 {
 156   if (!stem_l () || !rest_b ())
 157     return SCM_UNDEFINED;
 158
 159   Beam * b = stem_l ()->beam_l ();
 160   if (!b || !b->visible_stem_count ())
 161     return SCM_UNDEFINED;
 162
 163   /* ugh. Should be done by beam.
 164      (what? should be done --jcn)
 165     scary too?: height is calculated during post_processing
 166    */
 167   Real beam_dy = 0;
 168   Real beam_y = 0;
 169
 170   SCM s = b->get_elt_property ("height");
 171   if (gh_number_p (s))
 172     beam_dy = gh_scm2double (s);
 173
 174   s = b->get_elt_property ("y-position");
 175   if (gh_number_p (s))
 176     beam_y = gh_scm2double (s);
 177
 178
 179   Real x0 = b->first_visible_stem ()->relative_coordinate (0, X_AXIS);
 180   Real dx = b->last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
 181   Real dydx = beam_dy && dx ? beam_dy/dx : 0;
 182
 183   Direction d = stem_l ()->get_direction ();
 184   Real beamy = (stem_l ()->relative_coordinate (0, X_AXIS) - x0) * dydx + beam_y;
 185
 186   s = get_elt_pointer ("rests");
 187   Score_element * se = unsmob_element (gh_car (s));
 188   Staff_symbol_referencer_interface si (se);
 189
 190   Real staff_space = si.staff_space ();
 191   Real rest_dim = extent (Y_AXIS)[d]*2.0  /staff_space ;
 192
 193   Real minimum_dist
 194     = paper_l ()->get_var ("restcollision_minimum_beamdist") ;
 195   Real dist =
 196     minimum_dist +  -d  * (beamy - rest_dim) >? 0;
 197
 198   int stafflines = si.line_count ();
 199
 200   // move discretely by half spaces.
 201   int discrete_dist = int (ceil (dist ));
 202
 203   // move by whole spaces inside the staff.
 204   if (discrete_dist < stafflines+1)
 205     discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
 206
 207   translate_rests (-d *  discrete_dist);
 208
 209   return SCM_UNDEFINED;
 210 }
 211
 212
 213 Interval
 214 Note_column::rest_dim () const
 215 {
 216   Interval restdim;
 217   SCM s = get_elt_pointer ("rests");
 218   for (; gh_pair_p (s); s = gh_cdr (s))
 219     {
 220       Score_element * sc = unsmob_element ( gh_car (s));
 221       restdim.unite (sc->extent (Y_AXIS));
 222     }
 223
 224   return restdim;
 225 }
 226
 227 Note_head*
 228 Note_column::first_head () const
 229 {
 230   Stem * st = stem_l ();
 231   return st?  st->first_head (): 0;
 232 }