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--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include "beam.hh"
   9 #include "debug.hh"
  10 #include "rest-collision.hh"
  11 #include "note-column.hh"
  12 #include "stem.hh"
  13 #include "note-head.hh"
  14 #include "collision.hh"
  15 #include "paper-def.hh"
  16 #include "rest.hh"
  17 #include "group-interface.hh"
  18
  19 void
  20 Rest_collision::add_column (Note_column *nc_l)
  21 {
  22   add_dependency (nc_l);
  23   Group_interface gi (this);
  24   if (nc_l->rest_b ())
  25     gi.name_ = "rests";
  26   else
  27     gi.name_ = "notes";
  28
  29   gi.add_element (nc_l);
  30 }
  31
  32 void
  33 Rest_collision::do_pre_processing()
  34 {
  35   Link_array<Note_column> rest_l_arr =
  36     Group_interface__extract_elements (this, (Note_column*) 0, "rests");
  37   Link_array<Note_column> ncol_l_arr =
  38     Group_interface__extract_elements (this, (Note_column*) 0, "notes");
  39
  40
  41   /*
  42      handle rest-rest and rest-note collisions
  43
  44      [todo]
  45      * decide not to print rest if too crowded?
  46
  47      * ignore rests under beams.
  48    */
  49
  50   // no rests to collide
  51   if (!rest_l_arr.size())
  52     return;
  53
  54   // no partners to collide with
  55   if (rest_l_arr.size() + ncol_l_arr.size () < 2)
  56     return;
  57
  58   // meisjes met meisjes
  59   if (!ncol_l_arr.size())
  60     {
  61       /*
  62         UGH.  Should get dims from table.  Should have minimum dist.
  63        */
  64       int dy = rest_l_arr.size() > 2 ? 6 : 4;
  65
  66       rest_l_arr[0]->translate_rests (rest_l_arr[0]->dir () *dy);
  67       rest_l_arr.top()->translate_rests (rest_l_arr.top ()->dir ()* dy);
  68     }
  69   // meisjes met jongetjes
  70   else
  71     {
  72       if (rest_l_arr.size () > 1)
  73         {
  74           warning (_("too many colliding rests"));
  75         }
  76       if (ncol_l_arr.size () > 1)
  77         {
  78           warning (_("too many notes for rest collision"));
  79         }
  80       Note_column * rcol = rest_l_arr[0];
  81
  82       // try to be opposite of noteheads.
  83       Direction dir = - ncol_l_arr[0]->dir();
  84
  85       Interval restdim = rcol->rest_dim ();
  86       if (restdim.empty_b ())
  87         return;
  88
  89       // staff ref'd?
  90       Real staff_space = paper_l()->get_var ("interline");
  91
  92         /* FIXME
  93           staff_space =  rcol->rest_l_arr[0]->staff_space ();
  94         */
  95       Real half_staff_space_f = staff_space/2;
  96       Real minimum_dist = paper_l ()->get_var ("restcollision_minimum_dist")
  97         * half_staff_space_f;
  98
  99       /*
 100         assumption: ref points are the same.
 101        */
 102       Interval notedim;
 103       for (int i = 0; i < ncol_l_arr.size(); i++)
 104         {
 105           notedim.unite (ncol_l_arr[i]->extent (Y_AXIS));
 106         }
 107
 108       Interval inter (notedim);
 109       inter.intersect (restdim);
 110
 111       Real dist =
 112         minimum_dist +  dir * (notedim[dir] - restdim[-dir]) >? 0;
 113
 114
 115       // FIXME
 116       int stafflines = 5; // rcol->rest_l_arr[0]->line_count;
 117
 118
 119       // move discretely by half spaces.
 120       int discrete_dist = int (ceil (dist / (0.5 *staff_space)));
 121
 122       // move by whole spaces inside the staff.
 123       if (discrete_dist < stafflines+1)
 124         discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
 125
 126       rcol->translate_rests (dir * discrete_dist);
 127     }
 128 }
 129
 130
 131 Rest_collision::Rest_collision()
 132 {
 133   set_elt_property ("rests", SCM_EOL);
 134   set_elt_property ("notes", SCM_EOL);
 135   set_elt_property ("transparent", SCM_BOOL_T);
 136   set_empty (X_AXIS);
 137   set_empty (Y_AXIS);
 138 }
 139