lily/separating-group-spanner.cc

   1 /*
   2   separating-group-spanner.cc --  implement Separating_group_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "separating-group-spanner.hh"
  11 #include "separation-item.hh"
  12 #include "paper-column.hh"
  13 #include "paper-def.hh"
  14 #include "dimensions.hh"
  15 #include "group-interface.hh"
  16
  17 void
  18 Separating_group_spanner::find_rods (Item * r, SCM next)
  19 {
  20   Interval ri (Separation_item::my_width (r));
  21   if (ri.empty_b ())
  22     return;
  23
  24   /*
  25     This is an inner loop, however, in most cases, the interesting L
  26     will just be the first entry of NEXT, making it linear in most of
  27     the cases.  */
  28   for(; gh_pair_p (next); next = gh_cdr (next))
  29     {
  30       Item *l = dynamic_cast<Item*> (unsmob_grob (gh_car( next)));
  31       Item *lb = l->find_prebroken_piece (RIGHT);
  32
  33       if (lb)
  34         {
  35           Interval li (Separation_item::my_width (lb));
  36
  37           if (!li.empty_b ())
  38             {
  39               Rod rod;
  40
  41               rod.item_l_drul_[LEFT] = lb;
  42               rod.item_l_drul_[RIGHT] = r;
  43
  44               rod.distance_f_ = li[RIGHT] - ri[LEFT];
  45
  46               rod.columnize ();
  47               rod.add_to_cols ();
  48             }
  49         }
  50
  51       Interval li (Separation_item::my_width (l));
  52       if (!li.empty_b ())
  53         {
  54           Rod rod;
  55
  56           rod.item_l_drul_[LEFT] =l;
  57           rod.item_l_drul_[RIGHT]=r;
  58
  59           rod.distance_f_ = li[RIGHT] - ri[LEFT];
  60
  61           rod.columnize ();
  62           rod.add_to_cols ();
  63
  64           break;
  65         }
  66       else
  67         /*
  68           this grob doesn't cause a constraint. We look further until we
  69           find one that does.  */
  70         ;
  71     }
  72 }
  73
  74 MAKE_SCHEME_CALLBACK (Separating_group_spanner,set_spacing_rods,1);
  75 SCM
  76 Separating_group_spanner::set_spacing_rods (SCM smob)
  77 {
  78   Grob*me = unsmob_grob (smob);
  79
  80   for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s) && gh_pair_p (gh_cdr (s)); s = gh_cdr (s))
  81     {
  82       /*
  83         Order of elements is reversed!
  84        */
  85       SCM elt = gh_car (s);
  86       Item *r = dynamic_cast<Item*> (unsmob_grob (elt));
  87
  88       if (!r)
  89         continue;
  90
  91       Item *rb
  92         = dynamic_cast<Item*> (r->find_prebroken_piece (LEFT));
  93
  94       find_rods (r, gh_cdr (s));
  95       if (rb)
  96         find_rods (rb, gh_cdr (s));
  97     }
  98
  99   find_musical_sequences (me);
 100 #if 0
 101   /*
 102     TODO; restore this.
 103    */
 104   /*
 105     We've done our job, so we get lost.
 106    */
 107   for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s); s = gh_cdr (s))
 108     {
 109       Item * it =dynamic_cast<Item*> (unsmob_grob (gh_car (s)));
 110       if (it && it->broken_b ())
 111         {
 112           it->find_prebroken_piece (LEFT) ->suicide ();
 113           it->find_prebroken_piece (RIGHT)->suicide ();
 114         }
 115       it->suicide ();
 116     }
 117   me->suicide ();
 118 #endif
 119   return SCM_UNSPECIFIED ;
 120 }
 121
 122 void
 123 Separating_group_spanner::add_spacing_unit (Grob* me ,Item*i)
 124 {
 125   Pointer_group_interface::add_element (me, "elements",i);
 126   me->add_dependency (i);
 127 }
 128
 129
 130 void
 131 Separating_group_spanner::find_musical_sequences (Grob *me)
 132 {
 133   Item *last = 0;
 134   Item *llast = 0;
 135   for (SCM s = me->get_grob_property ("elements");
 136        gh_pair_p (s); s = gh_cdr (s))
 137     {
 138       Item *it = dynamic_cast<Item*> (unsmob_grob (gh_car (s)));
 139       if (last)
 140         {
 141           Item *lcol = last->column_l ();
 142           Item *col = it->column_l ();
 143
 144           int lrank = Paper_column::rank_i (lcol);
 145           int rank = Paper_column ::rank_i (col);
 146
 147           bool mus = Paper_column::musical_b (col);
 148           bool lmus = Paper_column::musical_b (lcol);
 149
 150           if ((lrank - rank == 2) && lmus && mus)
 151             {
 152               SCM seq = col->get_grob_property ("spacing-sequence");
 153               col->set_grob_property ("spacing-sequence",
 154                                       gh_cons (gh_cons (it->self_scm (), last->self_scm ()), seq));
 155             }
 156
 157           if (llast && !Paper_column::breakable_b (last))
 158             {
 159               Item *llcol = llast->column_l ();
 160               int llrank = Paper_column::rank_i (llcol);
 161               bool llmus= Paper_column::musical_b (llcol);
 162               if (llrank - lrank == 1
 163                   && lrank - rank == 1
 164                   && llmus && !lmus && mus)
 165                 {
 166                   SCM seq = col->get_grob_property ("spacing-sequence");
 167                   col->set_grob_property ("spacing-sequence",
 168                                           gh_cons (gh_cons (it->self_scm (), last->self_scm ()), seq));
 169                 }
 170               else if (!lmus)
 171                 {
 172                   SCM between = lcol->get_grob_property ("between-cols");
 173
 174                   if (!gh_pair_p (between))
 175                     {
 176                       between = gh_cons (it->self_scm (), llast->self_scm ());
 177                       lcol ->set_grob_property ("between-cols", between);
 178                     }
 179
 180                   Item * left
 181                     = dynamic_cast<Item*> (unsmob_grob (gh_car (between)));
 182                   if(Paper_column::rank_i (left->column_l ()) < rank)
 183                     gh_set_car_x (between, col->self_scm());
 184
 185                   Item * right
 186                     = dynamic_cast<Item*> (unsmob_grob (gh_cdr (between)));
 187                   if (Paper_column::rank_i (right->column_l ()) > llrank )
 188                     gh_set_cdr_x (between, llcol->self_scm ());
 189                 }
 190             }
 191         }
 192
 193       llast = last;
 194       last = it;
 195     }
 196 }
 197
 198 #if 0
 199 void
 200 Separating_group_spanner::set_loose_rods ()
 201 {
 202   // loose columns should  also generate minimum distances.
 203   // TODO
 204 }
 205 #endif
 206
 207
 208 void
 209 Separating_group_spanner::set_interface (Grob*)
 210 {
 211 }
 212
 213 bool
 214 Separating_group_spanner::has_interface (Grob*)
 215 {//todo
 216   assert (false);
 217 }