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--2000 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
  23 void
  24 Multi_measure_rest::set_interface (Score_element*me)
  25 {
  26   me->set_interface (ly_symbol2scm ("multi-measure-rest-interface"));
  27 }
  28
  29 bool
  30 Multi_measure_rest::has_interface (Score_element*me)
  31 {
  32   return me->has_interface (ly_symbol2scm ("multi-measure-rest-interface"));
  33 }
  34
  35   /*
  36    [TODO]                                      17
  37  * variable-sized multi-measure rest symbol: |====| ??
  38 */
  39 MAKE_SCHEME_CALLBACK(Multi_measure_rest,brew_molecule,1);
  40 SCM
  41 Multi_measure_rest::brew_molecule (SCM smob)
  42 {
  43   Score_element *me = unsmob_element (smob);
  44   Spanner * sp = dynamic_cast<Spanner*> (me);
  45   Real staff_space = Staff_symbol_referencer::staff_space (me);
  46
  47   Interval sp_iv;
  48   Direction d = LEFT;
  49   do
  50     {
  51       Item * col = sp->get_bound (d)->column_l ();
  52
  53       Interval coldim = col->extent (0, X_AXIS);
  54
  55       sp_iv[d] = coldim[-d]  ;
  56     }
  57   while ((flip (&d)) != LEFT);
  58   Molecule mol;
  59   Real x_off = 0.0;
  60
  61   Real rx  = sp->get_bound (LEFT)->relative_coordinate (0, X_AXIS);
  62   /*
  63     we gotta stay clear of sp_iv, so move a bit to the right if
  64     needed.
  65    */
  66   x_off += (sp_iv[LEFT] -  rx) >? 0;
  67
  68   /*
  69     center between stuff.
  70    */
  71   x_off += sp_iv.length ()/ 2;
  72
  73
  74   Molecule s;
  75
  76   int measures = 1;
  77   SCM m (me->get_elt_property ("measure-count"));
  78   if (gh_number_p (m))
  79     {
  80       measures = gh_scm2int (m);
  81     }
  82
  83
  84   SCM limit = me->get_elt_property ("expand-limit");
  85   if (measures <= gh_scm2int (limit))
  86     {
  87       /*
  88         Build a rest from smaller parts. Distances inbetween are
  89         really variable, see Wanske pp. 125 */
  90
  91       int l = measures;
  92       while (l)
  93         {
  94           int k;
  95           if (l >= 4)
  96             {
  97               l-=4;
  98               k = -2;
  99             }
 100           else if (l>= 2)
 101             {
 102               l -= 2;
 103               k = -1;
 104             }
 105           else
 106             {
 107               k = 0;
 108               l --;
 109             }
 110
 111           Real pad = s.empty_b ()
 112             ? 0.0 : gh_scm2double (me->get_elt_property ("padding")) * staff_space;
 113
 114           Molecule r (Font_interface::get_default_font (me)->find_by_name ("rests-" + to_str (k)));
 115           if (k == 0)
 116             r.translate_axis (staff_space, Y_AXIS);
 117
 118           s.add_at_edge (X_AXIS, RIGHT, r, pad);
 119         }
 120
 121
 122       s.align_to (X_AXIS, CENTER);
 123     }
 124   else
 125     {
 126       String idx =  ("rests-") + to_str (-4);
 127       s = Font_interface::get_default_font (me)->find_by_name (idx);
 128     }
 129
 130   mol.add_molecule (s);
 131
 132   if (measures > 1)
 133     {
 134       SCM properties = gh_list (me->mutable_property_alist_,
 135                                 me->immutable_property_alist_,
 136                                 SCM_UNDEFINED);
 137       Molecule s =
 138         Text_item::text2molecule (me,
 139                                   ly_str02scm (to_str (measures).ch_C ()),
 140                                   properties);
 141       s.align_to (X_AXIS, CENTER);
 142       s.translate_axis (3.0 * staff_space, Y_AXIS);
 143       mol.add_molecule (s);
 144     }
 145   mol.translate_axis (x_off, X_AXIS);
 146   return mol.create_scheme();
 147 }
 148
 149 /*
 150   UGH. JUNKME elt prop "columns" isn't really needed.
 151  */
 152 void
 153 Multi_measure_rest::add_column (Score_element*me,Item* c)
 154 {
 155   Pointer_group_interface::add_element (me, "columns",c);
 156
 157   add_bound_item (dynamic_cast<Spanner*> (me),c);
 158 }
 159
 160
 161 MAKE_SCHEME_CALLBACK (Multi_measure_rest, set_spacing_rods,1);
 162
 163 SCM
 164 Multi_measure_rest::set_spacing_rods (SCM smob)
 165 {
 166   Score_element*me = unsmob_element (smob);
 167
 168   Spanner*sp = dynamic_cast<Spanner*> (me);
 169   if (!(sp->get_bound (LEFT) && sp->get_bound (RIGHT)))
 170     {
 171       programming_error ("Multi_measure_rest::get_rods (): I am not spanned!");
 172       return SCM_UNSPECIFIED;
 173     }
 174
 175   Item * l = sp->get_bound (LEFT)->column_l ();
 176   Item * r = sp->get_bound (RIGHT)->column_l ();
 177   Item * lb = l->find_prebroken_piece (RIGHT);
 178   Item * rb = r->find_prebroken_piece (LEFT);
 179
 180   Item* combinations[4][2]={{l,r}, {lb,r}, {l,rb},{lb,rb}};
 181   Real staff_space = Staff_symbol_referencer::staff_space (me);
 182   for (int i=0; i < 4; i++)
 183     {
 184       Item * l =  combinations[i][0];
 185       Item *r = combinations[i][1];
 186
 187       if (!l || !r)
 188         continue;
 189
 190       Rod rod;
 191       rod.item_l_drul_[LEFT] = l;
 192       rod.item_l_drul_[RIGHT] = r;
 193
 194         /*
 195           should do something more advanced.
 196          */
 197       rod.distance_f_ = l->extent (l, X_AXIS)[BIGGER] - r->extent (r, X_AXIS)[SMALLER]
 198         + gh_scm2double (me->get_elt_property ("minimum-width")) * staff_space;
 199
 200       rod.add_to_cols ();
 201     }
 202   return SCM_UNSPECIFIED;
 203 }
 204