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