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
  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_property ("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()
  42 {
  43   set_elt_property ("rests", SCM_EOL);
  44   set_elt_property ("note-heads", SCM_EOL);
  45   set_axes (X_AXIS, Y_AXIS);
  46 }
  47
  48 Stem *
  49 Note_column::stem_l () const
  50 {
  51   SCM s = get_elt_property ("stem");
  52   return dynamic_cast<Stem*> (unsmob_element (s));
  53
  54 }
  55
  56
  57 Slice
  58 Note_column::head_positions_interval() const
  59 {
  60   Slice  iv;
  61
  62   iv.set_empty ();
  63
  64   SCM h = get_elt_property ("note-heads");
  65   for (; gh_pair_p (h); h = gh_cdr (h))
  66     {
  67       Score_element *se = unsmob_element (gh_car (h));
  68       Staff_symbol_referencer_interface si (se);
  69
  70       int j = int (si.position_f ());
  71       iv.unite (Slice (j,j));
  72     }
  73   return iv;
  74 }
  75
  76 Direction
  77 Note_column::dir () const
  78 {
  79   if (stem_l ())
  80     return stem_l ()->get_direction ();
  81   else if (gh_pair_p (get_elt_property ("note-heads")))
  82     return (Direction)sign (head_positions_interval().center ());
  83
  84   programming_error ("Note column without heads and stem!");
  85   return CENTER;
  86 }
  87
  88
  89 void
  90 Note_column::set_stem (Stem * stem_l)
  91 {
  92   set_elt_property ("stem", stem_l->self_scm_);
  93
  94   add_dependency (stem_l);
  95   add_element (stem_l);
  96 }
  97
  98
  99
 100 void
 101 Note_column::add_head (Rhythmic_head *h)
 102 {
 103   if (Rest*r=dynamic_cast<Rest *> (h))
 104     {
 105       Group_interface gi (this, "rests");
 106       gi.add_element (h);
 107     }
 108   if (Note_head *nh=dynamic_cast<Note_head *> (h))
 109     {
 110       Group_interface gi (this, "note-heads");
 111       gi.add_element (nh);
 112     }
 113   add_element (h);
 114 }
 115
 116 /**
 117   translate the rest symbols vertically by amount DY_I.
 118  */
 119 void
 120 Note_column::translate_rests (int dy_i)
 121 {
 122   SCM s = get_elt_property ("rests");
 123   for (; gh_pair_p (s); s = gh_cdr (s))
 124     {
 125       Score_element * se = unsmob_element (gh_car (s));
 126       Staff_symbol_referencer_interface si (se);
 127
 128       se->translate_axis (dy_i * si.staff_space ()/2.0, Y_AXIS);
 129     }
 130 }
 131
 132
 133 void
 134 Note_column::set_dotcol (Dot_column *d)
 135 {
 136   add_element (d);
 137 }
 138
 139 /*
 140   [TODO]
 141   handle rest under beam (do_post: beams are calculated now)
 142   what about combination of collisions and rest under beam.
 143
 144   Should lookup
 145
 146     rest -> stem -> beam -> interpolate_y_position ()
 147 */
 148
 149 void
 150 Note_column::do_post_processing ()
 151 {
 152   if (!stem_l () || !rest_b ())
 153     return;
 154
 155   Beam * b = stem_l ()->beam_l ();
 156   if (!b || !b->visible_stem_count ())
 157     return;
 158
 159   /* ugh. Should be done by beam.
 160      (what? should be done --jcn)
 161     scary too?: height is calculated during post_processing
 162    */
 163   Real beam_dy = 0;
 164   Real beam_y = 0;
 165
 166   SCM s = b->get_elt_property ("height");
 167   if (gh_number_p (s))
 168     beam_dy = gh_scm2double (s);
 169
 170   s = b->get_elt_property ("y-position");
 171   if (gh_number_p (s))
 172     beam_y = gh_scm2double (s);
 173
 174
 175   Real x0 = b->first_visible_stem ()->hpos_f ();
 176   Real dx = b->last_visible_stem ()->hpos_f () - x0;
 177   Real dydx = beam_dy && dx ? beam_dy/dx : 0;
 178
 179   Direction d = stem_l ()->get_direction ();
 180   Real beamy = (stem_l ()->hpos_f () - x0) * dydx + beam_y;
 181
 182   s = get_elt_property ("rests");
 183   Score_element * se = unsmob_element (gh_car (s));
 184   Staff_symbol_referencer_interface si (se);
 185
 186   Real staff_space = si.staff_space ();
 187   Real rest_dim = extent (Y_AXIS)[d]*2.0  /staff_space ;
 188
 189   Real minimum_dist
 190     = paper_l ()->get_var ("restcollision_minimum_beamdist") ;
 191   Real dist =
 192     minimum_dist +  -d  * (beamy - rest_dim) >? 0;
 193
 194   int stafflines = si.line_count ();
 195
 196   // move discretely by half spaces.
 197   int discrete_dist = int (ceil (dist ));
 198
 199   // move by whole spaces inside the staff.
 200   if (discrete_dist < stafflines+1)
 201     discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
 202
 203   translate_rests (-d *  discrete_dist);
 204 }
 205
 206
 207 Interval
 208 Note_column::rest_dim () const
 209 {
 210   Interval restdim;
 211   SCM s = get_elt_property ("rests");
 212   for (; gh_pair_p (s); s = gh_cdr (s))
 213     {
 214       Score_element * sc = unsmob_element ( gh_car (s));
 215       restdim.unite (sc->extent (Y_AXIS));
 216     }
 217
 218   return restdim;
 219 }
 220
 221 Note_head*
 222 Note_column::first_head () const
 223 {
 224   Stem * st = stem_l ();
 225   return st?  st->first_head (): 0;
 226 }