lily/rest-collision.cc

   1 /*
   2   rest-collision.cc -- implement Rest_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 <math.h>               // ceil.
   9
  10 #include "beam.hh"
  11 #include "debug.hh"
  12 #include "rest-collision.hh"
  13 #include "note-column.hh"
  14 #include "stem.hh"
  15 #include "note-head.hh"
  16 #include "collision.hh"
  17 #include "paper-def.hh"
  18 #include "rest.hh"
  19 #include "group-interface.hh"
  20 #include "staff-symbol-referencer.hh"
  21 #include "duration.hh"
  22
  23 void
  24 Rest_collision::add_column (Note_column *nc_l)
  25 {
  26   add_dependency (nc_l);
  27   Pointer_group_interface gi (this);
  28   if (nc_l->rest_b ())
  29     gi.name_ = "rests";
  30   else
  31     gi.name_ = "notes";
  32
  33   gi.add_element (nc_l);
  34 }
  35
  36 static Duration
  37 to_duration (int type, int dots)
  38 {
  39   Duration d;
  40   d.durlog_i_ = type;
  41   d.dots_i_ = dots;
  42   return d;
  43 }
  44
  45 static Moment
  46 rhythmic_head2mom (Rhythmic_head* r)
  47 {
  48   return to_duration (r->balltype_i (), r->dot_count ()).length_mom ();
  49 }
  50
  51 /*
  52   ugh
  53  */
  54 static Rhythmic_head*
  55 col2rhythmic_head (Note_column* c)
  56 {
  57   SCM s = c->get_elt_pointer ("rests");
  58   assert (gh_pair_p (s));
  59   Score_element* e = unsmob_element (gh_car (s));
  60   return dynamic_cast<Rhythmic_head*> (e);
  61 }
  62
  63 GLUE_SCORE_ELEMENT(Rest_collision,after_line_breaking);
  64
  65 SCM
  66 Rest_collision::member_after_line_breaking ()
  67 {
  68   Link_array<Note_column> rest_l_arr =
  69     Pointer_group_interface__extract_elements (this, (Note_column*) 0, "rests");
  70   Link_array<Note_column> ncol_l_arr =
  71     Pointer_group_interface__extract_elements (this, (Note_column*) 0, "notes");
  72
  73
  74   /*
  75      handle rest-rest and rest-note collisions
  76
  77      [todo]
  78      * decide not to print rest if too crowded?
  79
  80      * ignore rests under beams.
  81    */
  82
  83   // no rests to collide
  84   if (!rest_l_arr.size())
  85     return SCM_UNDEFINED;
  86
  87   // no partners to collide with
  88   if (rest_l_arr.size() + ncol_l_arr.size () < 2)
  89     return SCM_UNDEFINED;
  90
  91   // meisjes met meisjes
  92   if (!ncol_l_arr.size())
  93     {
  94       Moment m = rhythmic_head2mom (col2rhythmic_head (rest_l_arr[0]));
  95       int i = 1;
  96       for (; i < rest_l_arr.size (); i++)
  97         {
  98           Moment me = rhythmic_head2mom (col2rhythmic_head (rest_l_arr[i]));
  99           if (me != m)
 100             break;
 101         }
 102
 103       /*
 104         If all durations are the same, we'll check if there are more
 105         rests than maximum-rest-count.
 106         Otherwise (different durations), we'll try to display them all
 107         (urg: all 3 of them, currently).
 108        */
 109       int display_count;
 110       SCM s = get_elt_property ("maximum-rest-count");
 111       if (i == rest_l_arr.size ()
 112           && gh_number_p (s) && gh_scm2int (s) < rest_l_arr.size ())
 113         {
 114           display_count = gh_scm2int (s);
 115           for (; i > display_count; i--)
 116             col2rhythmic_head (rest_l_arr[i-1])
 117               ->set_elt_property ("molecule-callback", SCM_BOOL_T);
 118         }
 119       else
 120         display_count = rest_l_arr.size ();
 121
 122       /*
 123         UGH.  Should get dims from table.  Should have minimum dist.
 124        */
 125       int dy = display_count > 2 ? 6 : 4;
 126       if (display_count > 1)
 127         {
 128           rest_l_arr[0]->translate_rests (dy);
 129           rest_l_arr[1]->translate_rests (-dy);
 130         }
 131     }
 132   // meisjes met jongetjes
 133   else
 134     {
 135       if (rest_l_arr.size () > 1)
 136         {
 137           warning (_("too many colliding rests"));
 138         }
 139       if (ncol_l_arr.size () > 1)
 140         {
 141           warning (_("too many notes for rest collision"));
 142         }
 143       Note_column * rcol = rest_l_arr[0];
 144
 145       // try to be opposite of noteheads.
 146       Direction dir = - ncol_l_arr[0]->dir();
 147
 148       Interval restdim = rcol->rest_dim ();
 149       if (restdim.empty_b ())
 150         return SCM_UNDEFINED;
 151
 152       // staff ref'd?
 153       Real staff_space = paper_l()->get_var ("interline");
 154
 155         /* FIXME
 156           staff_space =  rcol->rest_l_arr[0]->staff_space ();
 157         */
 158       Real half_staff_space_f = staff_space/2;
 159       Real minimum_dist = paper_l ()->get_var ("restcollision_minimum_dist")
 160         * half_staff_space_f;
 161
 162       /*
 163         assumption: ref points are the same.
 164        */
 165       Interval notedim;
 166       for (int i = 0; i < ncol_l_arr.size(); i++)
 167         {
 168           notedim.unite (ncol_l_arr[i]->extent (Y_AXIS));
 169         }
 170
 171       Interval inter (notedim);
 172       inter.intersect (restdim);
 173
 174       Real dist =
 175         minimum_dist +  dir * (notedim[dir] - restdim[-dir]) >? 0;
 176
 177
 178       // FIXME
 179       //int stafflines = 5; // rcol->rest_l_arr[0]->line_count;
 180       int stafflines = Staff_symbol_referencer_interface (this).line_count ();
 181       // hurg?
 182       stafflines = stafflines != 0 ? stafflines : 5;
 183
 184       // move discretely by half spaces.
 185       int discrete_dist = int (ceil (dist / (0.5 *staff_space)));
 186
 187       // move by whole spaces inside the staff.
 188       if (discrete_dist < stafflines+1)
 189         discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
 190
 191       rcol->translate_rests (dir * discrete_dist);
 192     }
 193   return SCM_UNDEFINED;
 194 }
 195
 196
 197 Rest_collision::Rest_collision(SCM s)
 198   : Item (s)
 199 {
 200   set_elt_pointer ("rests", SCM_EOL);
 201   set_elt_pointer ("notes", SCM_EOL);
 202   set_extent_callback (0, X_AXIS);
 203   set_extent_callback (0, Y_AXIS);
 204 }
 205