lily/tie.cc

   1 /*
   2   tie.cc -- implement Tie
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "tie.hh"
  10
  11 #include "main.hh"
  12 #include "bezier.hh"
  13 #include "directional-element-interface.hh"
  14 #include "font-interface.hh"
  15 #include "grob-array.hh"
  16 #include "lookup.hh"
  17 #include "note-head.hh"
  18 #include "output-def.hh"
  19 #include "paper-column.hh"
  20 #include "pointer-group-interface.hh"
  21 #include "rhythmic-head.hh"
  22 #include "spanner.hh"
  23 #include "staff-symbol-referencer.hh"
  24 #include "stem.hh"
  25 #include "text-interface.hh"
  26 #include "tie-column.hh"
  27 #include "tie-configuration.hh"
  28 #include "tie-formatting-problem.hh"
  29 #include "warn.hh"
  30 #include "semi-tie-column.hh"
  31
  32
  33 bool
  34 Tie::less (Grob *const &s1, Grob *const &s2)
  35 {
  36   return Tie::get_position (s1) < Tie::get_position (s2);
  37 }
  38
  39 void
  40 Tie::set_head (Grob *me, Direction d, Grob *h)
  41 {
  42   dynamic_cast<Spanner *> (me)->set_bound (d, h);
  43 }
  44
  45 Grob *
  46 Tie::head (Grob *me, Direction d)
  47 {
  48   if (is_direction (me->get_property ("head-direction")))
  49      {
  50        Direction hd = to_dir (me->get_property ("head-direction"));
  51
  52        return (hd == d)
  53          ? unsmob_grob (me->get_object ("note-head"))
  54          : 0;
  55      }
  56
  57   Item *it = dynamic_cast<Spanner*> (me)->get_bound (d);
  58   if (Note_head::has_interface (it))
  59     return it;
  60   else
  61     return 0;
  62 }
  63
  64 int
  65 Tie::get_column_rank (Grob *me, Direction d)
  66 {
  67   Spanner *span = dynamic_cast<Spanner *> (me);
  68   Grob *h = head (me, d);
  69   if (!h)
  70     h = span->get_bound (d);
  71
  72   Grob *col = dynamic_cast<Item *> (h)->get_column ();
  73   return Paper_column::get_rank (col);
  74 }
  75
  76 int
  77 Tie::get_position (Grob *me)
  78 {
  79   Direction d = LEFT;
  80   do
  81     {
  82       Grob *h = head (me, d);
  83       if (h)
  84         return (int) rint (Staff_symbol_referencer::get_position (h));
  85     }
  86   while (flip (&d) != LEFT);
  87
  88   /*
  89
  90   TODO: this is theoretically possible for ties across more than 2
  91   systems.. We should look at the first broken copy.
  92
  93   */
  94   programming_error ("Tie without heads. Suicide");
  95   me->suicide ();
  96   return 0;
  97 }
  98
  99 /*
 100   Default:  Put the tie oppositie of the stem [Wanske p231]
 101
 102   In case of chords: Tie_column takes over
 103
 104   The direction of the Tie is more complicated (See [Ross] p136 and
 105   further).
 106
 107   (what about linebreaks? )
 108 */
 109 Direction
 110 Tie::get_default_dir (Grob *me)
 111 {
 112   Drul_array<Grob*> stems;
 113   Direction d = LEFT;
 114   do
 115     {
 116       Grob *one_head = head (me, d);
 117       if (!one_head && dynamic_cast<Spanner*> (me))
 118         one_head = Tie::head (dynamic_cast<Spanner*> (me)->broken_neighbor (d), d);
 119
 120       Grob *stem = one_head ? Rhythmic_head::get_stem (one_head) : 0;
 121       if (stem)
 122         stem = Stem::is_invisible (stem) ? 0 : stem;
 123
 124       stems[d] = stem;
 125     }
 126   while (flip (&d)!= LEFT);
 127
 128   if (stems[LEFT] && stems[RIGHT])
 129     {
 130       if (get_grob_direction (stems[LEFT]) == UP
 131           && get_grob_direction (stems[RIGHT]) == UP)
 132         return DOWN;
 133     }
 134   else if (stems[LEFT] || stems[RIGHT])
 135     {
 136       Grob *s = stems[LEFT] ? stems[LEFT] : stems[RIGHT];
 137       return -get_grob_direction (s);
 138     }
 139   else if (int p = get_position (me))
 140     return Direction (sign (p));
 141
 142   return to_dir (me->get_property("neutral-direction"));
 143 }
 144
 145
 146 MAKE_SCHEME_CALLBACK (Tie, calc_direction, 1);
 147 SCM
 148 Tie::calc_direction (SCM smob)
 149 {
 150   Grob *me = unsmob_grob (smob);
 151   Grob *yparent = me->get_parent (Y_AXIS);
 152   if ((Tie_column::has_interface (yparent)
 153        || Semi_tie_column::has_interface (yparent))
 154       && unsmob_grob_array (yparent->get_object ("ties"))
 155       //      && unsmob_grob_array (yparent->get_object ("ties"))->size () > 1
 156       )
 157     {
 158       /* trigger positioning. */
 159       (void) yparent->get_property ("positioning-done");
 160
 161       return me->get_property_data ("direction");
 162     }
 163   else
 164     return scm_from_int (Tie::get_default_dir (me));
 165 }
 166
 167
 168 SCM
 169 Tie::get_default_control_points (Grob *me_grob)
 170 {
 171   Spanner *me = dynamic_cast<Spanner*> (me_grob);
 172   Grob *common  = me;
 173   common = me->get_bound (LEFT)->common_refpoint (common, X_AXIS);
 174   common = me->get_bound (RIGHT)->common_refpoint (common, X_AXIS);
 175
 176   Tie_formatting_problem problem;
 177   problem.from_tie (me);
 178
 179   Tie_specification spec = problem.get_tie_specification (0);
 180   if (!me->is_live ())
 181     return SCM_EOL;
 182
 183
 184   Ties_configuration conf
 185     = problem.generate_optimal_configuration ();
 186
 187   return get_control_points (me, problem.common_x_refpoint (),
 188                              conf[0], problem.details_);
 189 }
 190
 191 SCM
 192 Tie::get_control_points (Grob *me,
 193                          Grob *common,
 194                          Tie_configuration const &conf,
 195                          Tie_details const &details
 196                          )
 197 {
 198   Bezier b = conf.get_transformed_bezier (details);
 199   b.translate (Offset (- me->relative_coordinate (common, X_AXIS), 0));
 200
 201   SCM controls = SCM_EOL;
 202   for (int i = 4; i--;)
 203     {
 204       if (!b.control_[i].is_sane ())
 205         programming_error ("Insane offset");
 206       controls = scm_cons (ly_offset2scm (b.control_[i]), controls);
 207     }
 208   return controls;
 209 }
 210
 211 MAKE_SCHEME_CALLBACK (Tie, calc_control_points, 1);
 212 SCM
 213 Tie::calc_control_points (SCM smob)
 214 {
 215   Grob *me = unsmob_grob (smob);
 216
 217   Grob *yparent = me->get_parent (Y_AXIS);
 218   if ((Tie_column::has_interface (yparent)
 219        || Semi_tie_column::has_interface (yparent))
 220       && unsmob_grob_array (yparent->get_object ("ties")))
 221     {
 222       extract_grob_set (yparent, "ties", ties);
 223       if (me->original() && ties.size() == 1
 224           && !to_dir (me->get_property_data ("direction")))
 225         {
 226           assert (ties[0] == me);
 227           set_grob_direction (me, Tie::get_default_dir (me));
 228
 229         }
 230       /* trigger positioning. */
 231       (void) yparent->get_property ("positioning-done");
 232     }
 233
 234   SCM cp = me->get_property_data ("control-points");
 235   if (!scm_is_pair (cp))
 236     {
 237       cp = get_default_control_points (me);
 238     }
 239
 240   return cp;
 241 }
 242
 243 /*
 244   TODO: merge with Slur::print.
 245  */
 246 MAKE_SCHEME_CALLBACK (Tie, print, 1);
 247 SCM
 248 Tie::print (SCM smob)
 249 {
 250   Grob *me = unsmob_grob (smob);
 251
 252   SCM cp = me->get_property ("control-points");
 253
 254   Real staff_thick = Staff_symbol_referencer::line_thickness (me);
 255   Real base_thick = staff_thick * robust_scm2double (me->get_property ("thickness"), 1);
 256   Real line_thick = staff_thick * robust_scm2double (me->get_property ("line-thickness"), 1);
 257
 258   Bezier b;
 259   int i = 0;
 260   for (SCM s = cp; scm_is_pair (s); s = scm_cdr (s))
 261     {
 262       b.control_[i] = ly_scm2offset (scm_car (s));
 263       i++;
 264     }
 265
 266   Stencil a;
 267
 268   SCM p = me->get_property ("dash-period");
 269   SCM f = me->get_property ("dash-fraction");
 270   if (scm_is_number (p) && scm_is_number (f))
 271     a = Lookup::dashed_slur (b,
 272                              line_thick,
 273                              robust_scm2double (p, 1.0),
 274                              robust_scm2double (f, 0));
 275   else
 276     a = Lookup::slur (b,
 277                       get_grob_direction (me) * base_thick,
 278                       line_thick);
 279
 280 #if DEBUG_TIE_SCORING
 281   SCM annotation = me->get_property ("annotation");
 282   if (!scm_is_string (annotation))
 283     {
 284       SCM debug = me->layout ()->lookup_variable (ly_symbol2scm ("debug-tie-scoring"));
 285       if (to_boolean (debug))
 286         annotation = me->get_property ("quant-score");
 287     }
 288   if (scm_is_string (annotation))
 289     {
 290       string str;
 291       SCM properties = Font_interface::text_font_alist_chain (me);
 292
 293       Stencil tm = *unsmob_stencil (Text_interface::interpret_markup
 294                                     (me->layout ()->self_scm (), properties,
 295                                      annotation));
 296       tm.translate (Offset (b.control_[3][X_AXIS] + 0.5,
 297                             b.control_[0][Y_AXIS] * 2));
 298       tm = tm.in_color (1, 0, 0);
 299
 300       /*
 301         It would be nice if we could put this in a different layer,
 302         but alas, this must be done with a Tie override.
 303        */
 304       a.add_stencil (tm);
 305     }
 306 #endif
 307
 308   return a.smobbed_copy ();
 309 }
 310
 311 ADD_INTERFACE (Tie,
 312                "A horizontal curve connecting two noteheads.",
 313
 314                /* properties */
 315                "annotation "
 316                "avoid-slur "    //  UGH.
 317                "control-points "
 318                "dash-fraction "
 319                "dash-period "
 320                "details "
 321                "direction "
 322                "head-direction "
 323                "line-thickness "
 324                "neutral-direction "
 325                "quant-score "
 326                "separation-item "
 327                "staff-position "
 328                "thickness "
 329                );
 330
 331
 332
 333
 334