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
  18 void
  19 Rest_collision::add_column (Note_column *nc_l)
  20 {
  21   add_dependency (nc_l);
  22   if (nc_l->rest_b ())
  23     rest_l_arr_.push (nc_l);
  24   else
  25     ncol_l_arr_.push (nc_l);
  26 }
  27
  28 void
  29 Rest_collision::do_pre_processing()
  30 {
  31   /*
  32      handle rest-rest and rest-note collisions
  33
  34      [todo]
  35      * decide not to print rest if too crowded?
  36
  37      * ignore rests under beams.
  38    */
  39
  40   // no rests to collide
  41   if (!rest_l_arr_.size())
  42     return;
  43
  44   // no partners to collide with
  45   if (rest_l_arr_.size() + ncol_l_arr_.size () < 2)
  46     return;
  47
  48   // meisjes met meisjes
  49   if (!ncol_l_arr_.size())
  50     {
  51       /*
  52         UGH.  Should get dims from table.  Should have minimum dist.
  53        */
  54       int dy = rest_l_arr_.size() > 2 ? 6 : 4;
  55
  56       rest_l_arr_[0]->translate_rests (rest_l_arr_[0]->dir () *dy);
  57       rest_l_arr_.top()->translate_rests (rest_l_arr_.top ()->dir ()* dy);
  58     }
  59   // meisjes met jongetjes
  60   else
  61     {
  62       if (rest_l_arr_.size () > 1)
  63         {
  64           warning (_("Too many colliding rests."));
  65         }
  66       if (ncol_l_arr_.size () > 1)
  67         {
  68           warning (_("Too many notes for rest collision."));
  69         }
  70       Note_column * rcol = rest_l_arr_[0];
  71
  72       // try to be opposite of noteheads.
  73       Direction dir = - ncol_l_arr_[0]->dir();
  74
  75       Interval restdim;
  76       for (int i=0; i < rcol->rest_l_arr_.size(); i++)
  77         restdim.unite (rcol->rest_l_arr_[i]->extent (Y_AXIS));
  78
  79       if (restdim.empty_b ())
  80         return;
  81
  82       // staff ref'd?
  83       Real staff_space = rcol->rest_l_arr_[0]->staff_line_leading_f ();
  84       Real internote_f = staff_space/2;
  85       Real minimum_dist = paper_l ()->get_var ("restcollision_minimum_dist")
  86         * internote_f;
  87
  88       /*
  89         assumption: ref points are the same.
  90        */
  91       Interval notedim;
  92       for (int i = 0; i < ncol_l_arr_.size(); i++)
  93         {
  94           notedim.unite (ncol_l_arr_[i]->extent (Y_AXIS));
  95         }
  96
  97       Interval inter (notedim);
  98       inter.intersect (restdim);
  99
 100       Real dist =
 101         minimum_dist +  dir * (notedim[dir] - restdim[-dir]) >? 0;
 102
 103
 104       int stafflines = rcol->rest_l_arr_[0]->lines_i ();
 105
 106
 107       // move discretely by half spaces.
 108       int discrete_dist = int (ceil (dist / (0.5 *staff_space)));
 109
 110       // move by whole spaces inside the staff.
 111       if (discrete_dist < stafflines+1)
 112         discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
 113
 114       rcol->translate_rests (dir * discrete_dist);
 115     }
 116 }
 117
 118 void
 119 Rest_collision::do_print() const
 120 {
 121 #ifndef NPRINT
 122   DOUT << "rests: " << rest_l_arr_.size() << ", ";
 123   DOUT << "cols: " << ncol_l_arr_.size();
 124 #endif
 125 }
 126
 127 void
 128 Rest_collision::do_substitute_element_pointer (Score_element*o,Score_element*n)
 129 {
 130   if (Note_column *onl = dynamic_cast<Note_column *> (o))
 131     {
 132       Note_column *n_l = n?dynamic_cast<Note_column *> (n):0;
 133       rest_l_arr_.substitute (onl, n_l);
 134       ncol_l_arr_.substitute (onl, n_l);
 135     }
 136 }
 137
 138 Rest_collision::Rest_collision()
 139 {
 140   set_elt_property (transparent_scm_sym, SCM_BOOL_T);
 141   set_empty (true);
 142 }