lily/multi-measure-rest.cc

   1 /*
   2   multi-measure-rest.cc --  implement Multi_measure_rest
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8  */
   9
  10 #include "multi-measure-rest.hh"
  11 #include "debug.hh"
  12 #include "paper-def.hh"
  13 #include "paper-column.hh" // urg
  14 #include "font-interface.hh"
  15 #include "rest.hh"
  16 #include "molecule.hh"
  17 #include "misc.hh"
  18 #include "group-interface.hh"
  19 #include "spanner.hh"
  20 #include "staff-symbol-referencer.hh"
  21 #include "text-item.hh"
  22 #include "percent-repeat-item.hh"
  23
  24
  25 void
  26 Multi_measure_rest::set_interface (Grob*me)
  27 {
  28   me->set_interface (ly_symbol2scm ("multi-measure-rest-interface"));
  29 }
  30
  31 bool
  32 Multi_measure_rest::has_interface (Grob*me)
  33 {
  34   return me->has_interface (ly_symbol2scm ("multi-measure-rest-interface"));
  35 }
  36
  37 MAKE_SCHEME_CALLBACK (Multi_measure_rest,percent,1);
  38 SCM
  39 Multi_measure_rest::percent (SCM smob)
  40 {
  41
  42   Grob *me = unsmob_grob (smob);
  43   Spanner *sp = dynamic_cast<Spanner*> (me);
  44
  45   Font_metric *musfont = Font_interface::get_default_font (me);
  46
  47   Molecule r = Percent_repeat_item_interface::x_percent (me, 1,  0.75, 1.6);
  48
  49   // ugh copy & paste.
  50
  51   Interval sp_iv;
  52   Direction d = LEFT;
  53   do
  54     {
  55       Item * col = sp->get_bound (d)->column_l ();
  56
  57       Interval coldim = col->extent (0, X_AXIS);
  58
  59       sp_iv[d] = coldim[-d]  ;
  60     }
  61   while ((flip (&d)) != LEFT);
  62   Real x_off = 0.0;
  63
  64   Real rx  = sp->get_bound (LEFT)->relative_coordinate (0, X_AXIS);
  65   /*
  66     we gotta stay clear of sp_iv, so move a bit to the right if
  67     needed.
  68    */
  69   x_off += (sp_iv[LEFT] -  rx) >? 0;
  70
  71   /*
  72     center between stuff.
  73    */
  74   x_off += sp_iv.length ()/ 2;
  75
  76   r.translate_axis (x_off,X_AXIS);
  77
  78
  79   return r.smobbed_copy ();
  80 }
  81
  82
  83 /*
  84    [TODO]                                      17
  85    variable-sized multi-measure rest symbol: |====| ??
  86 */
  87 MAKE_SCHEME_CALLBACK (Multi_measure_rest,brew_molecule,1);
  88 SCM
  89 Multi_measure_rest::brew_molecule (SCM smob)
  90 {
  91   Grob *me = unsmob_grob (smob);
  92   if (to_boolean (me->get_grob_property ("skip-timestep")))
  93     {
  94       me->set_grob_property ("skip-timestep", SCM_EOL);
  95       return SCM_EOL;
  96     }
  97
  98   Spanner * sp = dynamic_cast<Spanner*> (me);
  99
 100   SCM alist_chain = Font_interface::font_alist_chain (me);
 101
 102
 103   SCM style_chain =
 104     Font_interface::add_style (me, ly_symbol2scm ("mmrest-symbol"),
 105                                alist_chain);
 106
 107   Font_metric *musfont
 108     = Font_interface::get_font (me,style_chain);
 109
 110   Real staff_space = Staff_symbol_referencer::staff_space (me);
 111
 112   Interval sp_iv;
 113   Direction d = LEFT;
 114   do
 115     {
 116       Item * col = sp->get_bound (d)->column_l ();
 117
 118       Interval coldim = col->extent (0, X_AXIS);
 119
 120       sp_iv[d] = coldim[-d]  ;
 121     }
 122   while ((flip (&d)) != LEFT);
 123   Molecule mol;
 124   Real x_off = 0.0;
 125
 126   Real rx  = sp->get_bound (LEFT)->relative_coordinate (0, X_AXIS);
 127   /*
 128     we gotta stay clear of sp_iv, so move a bit to the right if
 129     needed.
 130    */
 131   x_off += (sp_iv[LEFT] -  rx) >? 0;
 132
 133   /*
 134     center between stuff.
 135    */
 136   x_off += sp_iv.length ()/ 2;
 137
 138
 139   Molecule s;
 140
 141   int measures = 0;
 142   SCM m (me->get_grob_property ("measure-count"));
 143   if (gh_number_p (m))
 144     {
 145       measures = gh_scm2int (m);
 146     }
 147
 148
 149   SCM limit = me->get_grob_property ("expand-limit");
 150   if (measures <= 0)
 151     return SCM_EOL;
 152   if (measures == 1)
 153     {
 154       s = musfont->find_by_name (Rest::glyph_name (me, 0, ""));
 155
 156       /*
 157         ugh.
 158        */
 159       if (Staff_symbol_referencer::position_f (me) == 0.0)
 160         s.translate_axis (Staff_symbol_referencer::staff_space (me), Y_AXIS);
 161     }
 162   else if (measures <= gh_scm2int (limit))
 163     {
 164       /*
 165         Build a rest from smaller parts. Distances inbetween are
 166         really variable, see Wanske pp. 125 */
 167
 168       int l = measures;
 169       while (l)
 170         {
 171           int k;
 172           if (l >= 4)
 173             {
 174               l-=4;
 175               k = -2;
 176             }
 177           else if (l>= 2)
 178             {
 179               l -= 2;
 180               k = -1;
 181             }
 182           else
 183             {
 184               k = 0;
 185               l --;
 186             }
 187
 188           Real pad = s.empty_b ()
 189             ? 0.0 : gh_scm2double (me->get_grob_property ("padding")) * staff_space;
 190
 191           Molecule r (musfont->find_by_name ("rests-" + to_str (k)));
 192           if (k == 0)
 193             r.translate_axis (staff_space, Y_AXIS);
 194
 195           s.add_at_edge (X_AXIS, RIGHT, r, pad);
 196         }
 197
 198
 199       s.align_to (X_AXIS, CENTER);
 200     }
 201   else
 202     {
 203       String idx = ("rests-") + to_str (-4);
 204       s = musfont->find_by_name (idx);
 205     }
 206
 207   mol.add_molecule (s);
 208
 209   if (measures > 1)
 210     {
 211       Molecule s = Text_item::text2molecule (me,
 212                                              ly_str02scm (to_str (measures).ch_C ()),
 213                                              alist_chain);
 214       s.align_to (X_AXIS, CENTER);
 215       s.translate_axis (3.0 * staff_space, Y_AXIS);
 216       mol.add_molecule (s);
 217     }
 218   mol.translate_axis (x_off, X_AXIS);
 219   return mol.smobbed_copy ();
 220 }
 221
 222 /*
 223   UGH. JUNKME elt prop "columns" isn't really needed.
 224  */
 225 void
 226 Multi_measure_rest::add_column (Grob*me,Item* c)
 227 {
 228   Pointer_group_interface::add_element (me, "columns",c);
 229
 230   add_bound_item (dynamic_cast<Spanner*> (me),c);
 231 }
 232
 233
 234 MAKE_SCHEME_CALLBACK (Multi_measure_rest, set_spacing_rods,1);
 235
 236 SCM
 237 Multi_measure_rest::set_spacing_rods (SCM smob)
 238 {
 239   Grob*me = unsmob_grob (smob);
 240
 241   Spanner*sp = dynamic_cast<Spanner*> (me);
 242   if (! (sp->get_bound (LEFT) && sp->get_bound (RIGHT)))
 243     {
 244       programming_error ("Multi_measure_rest::get_rods (): I am not spanned!");
 245       return SCM_UNSPECIFIED;
 246     }
 247
 248   Item * l = sp->get_bound (LEFT)->column_l ();
 249   Item * r = sp->get_bound (RIGHT)->column_l ();
 250   Item * lb = l->find_prebroken_piece (RIGHT);
 251   Item * rb = r->find_prebroken_piece (LEFT);
 252
 253   Item* combinations[4][2]={{l,r}, {lb,r}, {l,rb},{lb,rb}};
 254   Real staff_space = Staff_symbol_referencer::staff_space (me);
 255   for (int i=0; i < 4; i++)
 256     {
 257       Item * l =  combinations[i][0];
 258       Item *r = combinations[i][1];
 259
 260       if (!l || !r)
 261         continue;
 262
 263       Rod rod;
 264       rod.item_l_drul_[LEFT] = l;
 265       rod.item_l_drul_[RIGHT] = r;
 266
 267         /*
 268           should do something more advanced.
 269          */
 270       rod.distance_f_ = l->extent (l, X_AXIS)[BIGGER] - r->extent (r, X_AXIS)[SMALLER]
 271         + gh_scm2double (me->get_grob_property ("minimum-width")) * staff_space;
 272
 273       rod.add_to_cols ();
 274     }
 275   return SCM_UNSPECIFIED;
 276 }
 277