lily/separation-item.cc

   1 /*
   2      separation-item.cc --  implement Separation_item
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "separation-item.hh"
  11 #include "paper-column.hh"
  12 #include "warn.hh"
  13 #include "group-interface.hh"
  14 #include "accidental-placement.hh"
  15
  16 void
  17 Separation_item::add_item (Grob*s,Item* i)
  18 {
  19   assert (i);
  20   Pointer_group_interface::add_grob (s, ly_symbol2scm ("elements"),i);
  21   s->add_dependency (i);
  22 }
  23
  24 void
  25 Separation_item::add_conditional_item (Grob* me , Grob *e)
  26 {
  27   Pointer_group_interface::add_grob (me, ly_symbol2scm ("conditional-elements"), e);
  28 }
  29
  30 /*
  31   Return the width of ME given that we are considering the object on
  32   the LEFT.
  33  */
  34 Interval
  35 Separation_item::conditional_width (Grob * me, Grob * left)
  36 {
  37   Interval w = width (me);
  38
  39   Item *item = dynamic_cast<Item*> (me);
  40   Paper_column * pc = item->get_column ();
  41
  42
  43   for (SCM s =  me->get_grob_property ("conditional-elements"); gh_pair_p (s); s = ly_cdr (s))
  44     {
  45       SCM elt = ly_car (s);
  46       if (!unsmob_grob (elt))
  47         continue;
  48
  49       Item *il = unsmob_item (elt);
  50       if (pc != il->get_column ())
  51         {
  52           /* this shouldn't happen, but let's continue anyway. */
  53           programming_error (_ ("Separation_item:  I've been drinking too much"));
  54           continue;             /*UGH UGH*/
  55         }
  56
  57       if (to_boolean (il->get_grob_property ("no-spacing-rods")))
  58         {
  59           continue;
  60         }
  61
  62       if (Accidental_placement::has_interface (il))
  63         {
  64           w.unite (Accidental_placement::get_relevant_accidental_extent (il, pc, left));
  65         }
  66     }
  67
  68   SCM pad = me->get_grob_property ("padding");
  69
  70   if (gh_number_p (pad))
  71     {
  72       w[RIGHT] += gh_scm2double (pad)/2;
  73       w[LEFT] -= gh_scm2double (pad)/2;
  74     }
  75   return w;
  76 }
  77
  78 Interval
  79 Separation_item::width (Grob *me)
  80 {
  81   SCM sw = me->get_grob_property ("X-extent");
  82   if (ly_number_pair_p (sw))
  83     {
  84       return ly_scm2interval (sw);
  85     }
  86
  87   Item *item = dynamic_cast<Item*> (me);
  88   Paper_column * pc = item->get_column ();
  89   Interval w;
  90
  91   for (SCM s =  me->get_grob_property ("elements"); gh_pair_p (s); s = ly_cdr (s))
  92     {
  93       SCM elt = ly_car (s);
  94       if (!unsmob_grob (elt))
  95         continue;
  96
  97       Item *il = unsmob_item (elt);
  98       if (pc != il->get_column ())
  99         {
 100           /* this shouldn't happen, but let's continue anyway. */
 101           programming_error (_ ("Separation_item:  I've been drinking too much"));
 102           continue;             /*UGH UGH*/
 103         }
 104
 105       if (to_boolean (il->get_grob_property ("no-spacing-rods")))
 106         {
 107           continue;
 108         }
 109
 110       Interval iv (il->extent (pc, X_AXIS));
 111       if (!iv.empty_b ())
 112         {
 113           w.unite (iv);
 114         }
 115     }
 116
 117   SCM pad = me->get_grob_property ("padding");
 118
 119   if (gh_number_p (pad))
 120   {
 121     w[RIGHT] += gh_scm2double (pad)/2;
 122     w[LEFT] -= gh_scm2double (pad)/2;
 123   }
 124
 125   me->set_grob_property ("X-extent", ly_interval2scm (w));
 126
 127   return w;
 128 }
 129
 130
 131
 132
 133
 134 ADD_INTERFACE (Separation_item,"separation-item-interface",
 135   "Item that computes widths to generate spacing rods.\n"
 136 "\n"
 137 "Calculate dimensions for the Separating_group_spanner; this has to be "
 138 "an item to get dependencies correct.  "
 139 , "padding X-extent conditional-elements elements");