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   /*
 100     We've done our job, so we get lost.
 101    */
 102   for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s); s = gh_cdr (s))
 103     {
 104       Item * it =dynamic_cast<Item*> (unsmob_grob (gh_car (s)));
 105       if (it && it->broken_b ())
 106         {
 107           it->find_prebroken_piece (LEFT) ->suicide ();
 108           it->find_prebroken_piece (RIGHT)->suicide ();
 109         }
 110       it->suicide ();
 111     }
 112   me->suicide ();
 113   return SCM_UNSPECIFIED ;
 114 }
 115
 116 void
 117 Separating_group_spanner::add_spacing_unit (Grob* me ,Item*i)
 118 {
 119   Pointer_group_interface::add_element (me, "elements",i);
 120   me->add_dependency (i);
 121 }
 122
 123
 124 void
 125 Separating_group_spanner::set_interface (Grob*)
 126 {
 127 }
 128
 129 bool
 130 Separating_group_spanner::has_interface (Grob*)
 131 {//todo
 132   assert (false);
 133 }