lily/collision.cc

   1 /*
   2   collision.cc -- implement Collision
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include "debug.hh"
   9 #include "collision.hh"
  10 #include "note-column.hh"
  11 #include "rhythmic-head.hh"
  12 #include "paper-def.hh"
  13 #include "axis-group-interface.hh"
  14 #include "item.hh"
  15
  16
  17 MAKE_SCHEME_CALLBACK(Collision,force_shift_callback,2);
  18 SCM
  19 Collision::force_shift_callback (SCM element_smob, SCM axis)
  20 {
  21   Grob *me = unsmob_grob (element_smob);
  22   Axis a = (Axis) gh_scm2int (axis);
  23   assert (a == X_AXIS);
  24
  25    me = me->parent_l (a);
  26   /*
  27     ugh. the way DONE is done is not clean
  28    */
  29   if (!unsmob_grob (me->get_grob_property ("done")))
  30     {
  31       me->set_grob_property ("done", me->self_scm ());
  32       do_shifts (me);
  33     }
  34
  35   return gh_double2scm (0.0);
  36 }
  37
  38 /*
  39   TODO: make callback of this.
  40  */
  41 void
  42 Collision::do_shifts(Grob* me)
  43 {
  44   SCM autos (automatic_shift (me));
  45   SCM hand (forced_shift (me));
  46
  47   Link_array<Grob> done;
  48
  49   Real wid
  50     = gh_scm2double (me->get_grob_property ("note-width"));
  51
  52   for (; gh_pair_p (hand); hand =gh_cdr (hand))
  53     {
  54       Grob * s = unsmob_grob (gh_caar (hand));
  55       Real amount = gh_scm2double (gh_cdar (hand));
  56
  57       s->translate_axis (amount *wid, X_AXIS);
  58       done.push (s);
  59     }
  60   for (; gh_pair_p (autos); autos =gh_cdr (autos))
  61     {
  62       Grob * s = unsmob_grob (gh_caar (autos));
  63       Real amount = gh_scm2double (gh_cdar (autos));
  64
  65       if (!done.find_l (s))
  66         s->translate_axis (amount * wid, X_AXIS);
  67     }
  68 }
  69
  70 /** This complicated routine moves note columns around horizontally to
  71   ensure that notes don't clash.
  72
  73   This should be put into Scheme.
  74   */
  75 SCM
  76 Collision::automatic_shift (Grob *me)
  77 {
  78   Drul_array<Link_array<Grob> > clash_groups;
  79   Drul_array<Array<int> > shifts;
  80   SCM  tups = SCM_EOL;
  81
  82   SCM s = me->get_grob_property ("elements");
  83   for (; gh_pair_p (s); s = gh_cdr (s))
  84     {
  85       SCM car = gh_car (s);
  86
  87       Grob * se = unsmob_grob (car);
  88       if (Note_column::has_interface (se))
  89         clash_groups[Note_column::dir (se)].push (se);
  90     }
  91
  92
  93   Direction d = UP;
  94   do
  95     {
  96       Array<int> & shift (shifts[d]);
  97       Link_array<Grob> & clashes (clash_groups[d]);
  98
  99       clashes.sort (Note_column::shift_compare);
 100
 101       for (int i=0; i < clashes.size (); i++)
 102         {
 103           SCM sh
 104             = clashes[i]->get_grob_property ("horizontal-shift");
 105
 106           if (gh_number_p (sh))
 107             shift.push (gh_scm2int (sh));
 108           else
 109             shift.push (0);
 110         }
 111
 112       for (int i=1; i < shift.size (); i++)
 113         {
 114           if (shift[i-1] == shift[i])
 115             {
 116               warning (_ ("Too many clashing notecolumns.  Ignoring them."));
 117               return tups;
 118             }
 119         }
 120     }
 121   while ((flip (&d))!= UP);
 122
 123   Drul_array< Array < Slice > > extents;
 124   Drul_array< Array < Real > > offsets;
 125   d = UP;
 126   do
 127     {
 128       for (int i=0; i < clash_groups[d].size (); i++)
 129         {
 130           Slice s(Note_column::head_positions_interval (clash_groups[d][i]));
 131           s[LEFT] --;
 132           s[RIGHT]++;
 133           extents[d].push (s);
 134           offsets[d].push (d * 0.5 * i);
 135         }
 136     }
 137   while ((flip (&d))!= UP);
 138
 139   do
 140     {
 141       for (int i=1; i < clash_groups[d].size (); i++)
 142         {
 143           Slice prev =extents[d][i-1];
 144           prev.intersect (extents[d][i]);
 145           if (prev.length ()> 0 ||
 146               (extents[-d].size () && d * (extents[d][i][-d] - extents[-d][0][d]) < 0))
 147             for (int j = i; j <  clash_groups[d].size (); j++)
 148               offsets[d][j] += d * 0.5;
 149         }
 150     }
 151   while ((flip (&d))!= UP);
 152
 153   /*
 154     if the up and down version are close, and can not be merged, move
 155     all of them again. */
 156   if (extents[UP].size () && extents[DOWN].size ())
 157     {
 158       Grob *cu_l =clash_groups[UP][0];
 159       Grob *cd_l =clash_groups[DOWN][0];
 160
 161
 162       /*
 163         TODO.
 164        */
 165       Grob * nu_l= Note_column::first_head(cu_l);
 166       Grob * nd_l = Note_column::first_head(cd_l);
 167
 168       int downpos = Note_column::head_positions_interval (cd_l)[BIGGER];
 169       int uppos = Note_column::head_positions_interval (cu_l)[SMALLER];
 170
 171       bool merge  =
 172         downpos == uppos
 173         && Rhythmic_head::balltype_i (nu_l) == Rhythmic_head::balltype_i (nd_l);
 174
 175
 176       if (!to_boolean (me->get_grob_property ("merge-differently-dotted")))
 177         merge = merge && Rhythmic_head::dot_count (nu_l) == Rhythmic_head::dot_count (nd_l);
 178
 179       /*
 180         notes are close, but can not be merged.  Shift
 181        */
 182       if (abs(uppos - downpos) < 2 && !merge)
 183           do
 184           {
 185             for (int i=0; i < clash_groups[d].size (); i++)
 186               {
 187                 offsets[d][i] -= d * 0.5;
 188               }
 189           }
 190           while ((flip (&d))!= UP);
 191     }
 192
 193   do
 194     {
 195       for (int i=0; i < clash_groups[d].size (); i++)
 196         tups = gh_cons (gh_cons (clash_groups[d][i]->self_scm (), gh_double2scm (offsets[d][i])),
 197                                  tups);
 198     }
 199   while (flip (&d) != UP);
 200   return tups;
 201 }
 202
 203
 204 SCM
 205 Collision::forced_shift (Grob *me)
 206 {
 207   SCM tups = SCM_EOL;
 208
 209   SCM s = me->get_grob_property ("elements");
 210   for (; gh_pair_p (s); s = gh_cdr (s))
 211     {
 212       Grob * se = unsmob_grob (gh_car (s));
 213
 214       SCM force =  se->remove_grob_property ("force-hshift");
 215       if (gh_number_p (force))
 216         {
 217           tups = gh_cons (gh_cons (se->self_scm (), force),
 218                           tups);
 219         }
 220     }
 221   return tups;
 222 }
 223
 224
 225
 226
 227 void
 228 Collision::add_column (Grob*me,Grob* ncol_l)
 229 {
 230   ncol_l->add_offset_callback (Collision::force_shift_callback_proc, X_AXIS);
 231   Axis_group_interface::add_element (me, ncol_l);
 232   me->add_dependency (ncol_l);
 233 }