lily/tuplet-bracket.cc

   1 /*
   2   plet-spanner.cc -- implement Tuplet_bracket
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include <math.h>
  10
  11 #include "beam.hh"
  12 #include "box.hh"
  13 #include "debug.hh"
  14 #include "font-interface.hh"
  15 #include "molecule.hh"
  16 #include "paper-column.hh"
  17 #include "paper-def.hh"
  18 #include "text-item.hh"
  19 #include "tuplet-spanner.hh"
  20 #include "stem.hh"
  21 #include "note-column.hh"
  22 #include "dimensions.hh"
  23 #include "group-interface.hh"
  24 #include "directional-element-interface.hh"
  25 #include "spanner.hh"
  26 #include "staff-symbol-referencer.hh"
  27
  28 /*
  29   TODO:
  30   staff-line collisions for horizontal tuplet brackets.
  31  */
  32
  33
  34
  35 void
  36 Tuplet_bracket::set_interface (Grob*me)
  37 {
  38   me->set_interface (ly_symbol2scm ("tuplet-bracket"));
  39 }
  40
  41 /*
  42   TODO: use stem->beam fields to find Beams. Autobeams aren't found
  43   through the engraver mechanism.  */
  44 MAKE_SCHEME_CALLBACK (Tuplet_bracket,brew_molecule,1);
  45 SCM
  46 Tuplet_bracket::brew_molecule (SCM smob)
  47 {
  48   Grob *me= unsmob_grob (smob);
  49   Molecule  mol;
  50   Link_array<Grob> column_arr=
  51     Pointer_group_interface__extract_elements (me, (Grob*)0, "columns");
  52
  53
  54   if (!column_arr.size ())
  55     return mol.smobbed_copy ();
  56
  57
  58   Grob *b1 = Note_column::stem_l (column_arr[0]);
  59   Grob *b2 = Note_column::stem_l (column_arr.top());
  60
  61   b1 = b1 ? Stem::beam_l (b1) : 0;
  62   b2 = b2 ? Stem::beam_l (b2) : 0;
  63
  64
  65   Spanner*sp = dynamic_cast<Spanner*> (me);
  66
  67   // Default behaviour: number always, bracket when no beam!
  68   bool par_beam = b1 && (b1 == b2) && !sp->broken_b() ;
  69
  70   bool bracket_visibility = !par_beam;
  71   bool number_visibility = true;
  72
  73   SCM bracket = me->get_grob_property ("tuplet-bracket-visibility");
  74   if (gh_boolean_p (bracket))
  75     {
  76       bracket_visibility = gh_scm2bool (bracket);
  77     }
  78   else if (bracket == ly_symbol2scm ("if-no-beam"))
  79     bracket_visibility = !par_beam;
  80
  81   SCM numb = me->get_grob_property ("tuplet-number-visibility");
  82   if (gh_boolean_p (numb))
  83     {
  84       number_visibility = gh_scm2bool (numb);
  85     }
  86   else if (numb == ly_symbol2scm ("if-no-beam"))
  87     number_visibility = !par_beam;
  88
  89
  90   Real ncw = column_arr.top ()->extent (column_arr.top (), X_AXIS).length ();
  91   Real w = sp->spanner_length () + ncw;
  92
  93   Direction dir = Directional_element_interface::get (me);
  94   Real dy = gh_scm2double (me->get_grob_property ("delta-y"));
  95   SCM number = me->get_grob_property ("text");
  96   if (gh_string_p (number) && number_visibility)
  97     {
  98       SCM properties = Font_interface::font_alist_chain (me);
  99       Molecule num = Text_item::text2molecule (me, number, properties);
 100       num.align_to (X_AXIS, CENTER);
 101       num.translate_axis (w/2, X_AXIS);
 102       num.align_to (Y_AXIS, CENTER);
 103
 104       num.translate_axis (dy/2, Y_AXIS);
 105
 106       mol.add_molecule (num);
 107     }
 108
 109   if (bracket_visibility)
 110     {
 111       Real  lt =  me->paper_l ()->get_var ("stafflinethickness");
 112
 113       SCM thick = me->get_grob_property ("thick");
 114       SCM gap = me->get_grob_property ("number-gap");
 115
 116       SCM at =gh_list (ly_symbol2scm ("tuplet"),
 117                        gh_double2scm (1.0),
 118                        gap,
 119                        gh_double2scm (w),
 120                        gh_double2scm (dy),
 121                        gh_double2scm (gh_scm2double (thick)* lt),
 122                        gh_int2scm (dir),
 123                        SCM_UNDEFINED);
 124
 125       Box b;
 126       mol.add_molecule (Molecule (b, at));
 127     }
 128
 129   return mol.smobbed_copy ();
 130 }
 131
 132
 133
 134
 135 /*
 136   use first -> last note for slope, and then correct for disturbing
 137   notes in between.  */
 138 void
 139 Tuplet_bracket::calc_position_and_height (Grob*me,Real *offset, Real * dy)
 140 {
 141   Link_array<Grob> column_arr=
 142     Pointer_group_interface__extract_elements (me, (Grob*)0, "columns");
 143
 144
 145   Grob * commony = me->common_refpoint (me->get_grob_property ("columns"), Y_AXIS);
 146   Grob * commonx = me->common_refpoint (me->get_grob_property ("columns"), X_AXIS);
 147
 148   Direction d = Directional_element_interface::get (me);
 149
 150   /*
 151     Use outer non-rest columns to determine slope
 152    */
 153   int l = 0;
 154   while (l <column_arr.size () && Note_column::rest_b (column_arr[l]))
 155     l ++;
 156
 157   int r = column_arr.size ()- 1;
 158   while (r >= l && Note_column::rest_b (column_arr[r]))
 159     r--;
 160
 161   if (l < r)
 162     {
 163       *dy = column_arr[r]->extent (commony, Y_AXIS) [d]
 164         - column_arr[l]->extent (commony, Y_AXIS) [d] ;
 165     }
 166   else
 167     * dy = 0;
 168
 169
 170   *offset = - d * infinity_f;
 171
 172   if (!column_arr.size ())
 173     return;
 174
 175   Real x0 = column_arr[0]->relative_coordinate (commonx, X_AXIS);
 176   Real x1 = column_arr.top ()->relative_coordinate (commonx, X_AXIS);
 177
 178   Real factor = column_arr.size () > 1 ? 1/ (x1 - x0) : 1.0;
 179
 180   for (int i = 0; i < column_arr.size ();  i++)
 181     {
 182       Real notey = column_arr[i]->extent (commony, Y_AXIS)[d]
 183         - me->relative_coordinate (commony, Y_AXIS);
 184
 185       Real x = column_arr[i]->relative_coordinate (commonx, X_AXIS) - x0;
 186       Real tuplety =  *dy * x * factor;
 187
 188       if (notey * d > (*offset + tuplety) * d)
 189         *offset = notey - tuplety;
 190     }
 191
 192   // padding
 193   *offset +=  1.0 *d;
 194
 195
 196   /*
 197     horizontal brackets should not collide with staff lines.
 198
 199
 200    */
 201   if (*dy == 0)
 202     {
 203       // quantize, then do collision check.
 204       Real ss= Staff_symbol_referencer::staff_space (me);
 205       *offset *= 2 / ss;
 206
 207       *offset = rint (*offset);
 208       if (Staff_symbol_referencer::on_staffline (me, (int) rint (*offset)))
 209         *offset += d;
 210
 211       *offset *= 0.5 * ss;
 212     }
 213
 214 }
 215
 216 /*
 217   use first -> last note for slope,
 218 */
 219 void
 220 Tuplet_bracket::calc_dy (Grob*me,Real * dy)
 221 {
 222   Link_array<Grob> column_arr=
 223     Pointer_group_interface__extract_elements (me, (Grob*)0, "columns");
 224
 225   /*
 226     ugh. refps.
 227    */
 228   Direction d = Directional_element_interface::get (me);
 229   *dy = column_arr.top ()->extent (column_arr.top (), Y_AXIS) [d]
 230     - column_arr[0]->extent (column_arr[0], Y_AXIS) [d];
 231 }
 232 MAKE_SCHEME_CALLBACK (Tuplet_bracket,after_line_breaking,1);
 233
 234 SCM
 235 Tuplet_bracket::after_line_breaking (SCM smob)
 236 {
 237   Grob * me = unsmob_grob (smob);
 238   Link_array<Note_column> column_arr=
 239     Pointer_group_interface__extract_elements (me, (Note_column*)0, "columns");
 240
 241   if (!column_arr.size ())
 242     {
 243       me->suicide ();
 244       return SCM_UNSPECIFIED;
 245     }
 246
 247   Direction d = Directional_element_interface::get (me);
 248   if (!d)
 249     {
 250       d = Tuplet_bracket::get_default_dir (me);
 251       Directional_element_interface::set (me, d);
 252
 253     }
 254   Real dy, offset;
 255
 256   calc_position_and_height (me,&offset,&dy);
 257
 258   me->set_grob_property ("delta-y", gh_double2scm (dy));
 259
 260   me->translate_axis (offset, Y_AXIS);
 261   return SCM_UNSPECIFIED;
 262 }
 263
 264
 265 Direction
 266 Tuplet_bracket::get_default_dir (Grob*me)
 267 {
 268   Direction d = UP;
 269   SCM dir_sym =me->get_grob_property ("dir-forced");
 270   if (isdir_b (dir_sym))
 271     {
 272       d= to_dir (dir_sym);
 273       if (d != CENTER)
 274         return d;
 275     }
 276
 277   d = UP ;
 278   for (SCM s = me->get_grob_property ("columns"); gh_pair_p (s); s = gh_cdr (s))
 279     {
 280       Grob * nc = unsmob_grob (gh_car (s));
 281       if (Note_column::dir (nc) < 0)
 282         {
 283           d = DOWN;
 284           break;
 285         }
 286     }
 287
 288   return d;
 289 }
 290
 291 void
 292 Tuplet_bracket::add_column (Grob*me, Item*n)
 293 {
 294   Pointer_group_interface::add_element (me, "columns",n);
 295   me->add_dependency (n);
 296
 297   add_bound_item (dynamic_cast<Spanner*> (me), n);
 298 }
 299
 300