lily/break.cc

   1 /*
   2   break.cc -- implement Break_algorithm
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996,  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "score-column.hh"
  10 #include "break.hh"
  11 #include "paper-def.hh"
  12 #include "spring-spacer.hh"
  13 #include "debug.hh"
  14 #include "line-of-score.hh"
  15 #include "paper-score.hh"
  16 #include "paper-column.hh"
  17 #include "cpu-timer.hh"
  18 #include "command-request.hh"
  19
  20 String
  21 Col_stats::str () const
  22 {
  23   String s;
  24   if (!count_i_)
  25     s = _ ("0 lines");
  26   else if (count_i_ == 1)
  27     s = _f ("1 line (of %.0f columns)", (Real)cols_i_/count_i_);
  28   else
  29     s = _f ("%d lines (with an average of %.1f columns)",
  30       count_i_, (Real)cols_i_/count_i_);
  31   return s;
  32 }
  33
  34 void
  35 Col_stats::add (Line_of_cols const& line)
  36 {
  37   count_i_++;
  38   cols_i_ += line.size ();
  39 }
  40
  41
  42 Col_stats::Col_stats ()
  43 {
  44   count_i_ =0;
  45   cols_i_ =0;
  46 }
  47
  48 /* **************************************************************** */
  49
  50
  51 Array<int>
  52 Break_algorithm::find_break_indices () const
  53 {
  54   Line_of_cols all (pscore_l_->col_l_arr_);
  55   Array<int> retval;
  56
  57   for (int i=0; i < all.size (); i++)
  58     if (all[i]->breakable_b ())
  59       retval.push (i);
  60
  61   if (linelength <=0)
  62     while (retval.size () >2)
  63       retval.del (1);
  64
  65   return retval;
  66 }
  67
  68
  69 Line_of_cols
  70 Break_algorithm::find_breaks () const
  71 {
  72   Line_of_cols all (pscore_l_->col_l_arr_);
  73   Line_of_cols retval;
  74
  75   for (int i=0; i < all.size (); i++)
  76     if (all[i]->breakable_b ())
  77       retval.push (all[i]);
  78
  79
  80   if (linelength <=0)
  81     while (retval.size () >2)
  82       retval.del (1);
  83
  84   return retval;
  85 }
  86
  87
  88
  89
  90
  91 Line_spacer*
  92 Break_algorithm::generate_spacing_problem (Line_of_cols curline, Interval line) const
  93 {
  94   // ugh
  95   Spring_spacer * sp= dynamic_cast<Spring_spacer*> ((*get_line_spacer) ());
  96
  97   sp->paper_l_ = pscore_l_->paper_l_;
  98   sp->add_column (curline[0], true, line[LEFT]);
  99   for (int i=1; i< curline.size ()-1; i++)
 100     sp->add_column (curline[i]);
 101
 102   if (line.length () > 0)
 103     {
 104       sp->add_column (curline.top (), true, line[RIGHT]);
 105       sp->energy_normalisation_f_  = sqr (line.length ());
 106     }
 107   else
 108     sp->add_column (curline.top ());
 109
 110   sp->prepare ();
 111   return sp;
 112 }
 113
 114 Break_algorithm::Break_algorithm ()
 115 {
 116   pscore_l_ = 0;
 117   get_line_spacer =0;
 118   linelength = 0;
 119 }
 120
 121 void
 122 Break_algorithm::set_pscore (Paper_score*s)
 123 {
 124   pscore_l_ = s;
 125   linelength = s->paper_l_->linewidth_f ();
 126   do_set_pscore ();
 127 }
 128
 129 bool
 130 Break_algorithm::feasible (Line_of_cols curline) const
 131 {
 132   if (linelength <=  0)
 133     return true;
 134
 135   for (int i=0; i < curline.size (); i++)
 136     {
 137       if (i && i < curline.size () -1
 138           && ((dynamic_cast<Score_column*>(curline[i]))->break_penalty_i () >= Break_req::FORCE))
 139         return false;
 140     }
 141   return true;
 142 }
 143
 144 void
 145 Break_algorithm::problem_OK () const
 146 {
 147   if (pscore_l_->col_l_arr_.empty ())
 148     error (_("score does not have any columns"));
 149   OK ();
 150 }
 151
 152 void
 153 Break_algorithm::OK () const
 154 {
 155 }
 156
 157 Array<Column_x_positions>
 158 Break_algorithm::solve () const
 159 {
 160   Cpu_timer timer;
 161
 162   Array<Column_x_positions> h= do_solve ();
 163
 164   if (approx_stats_.count_i_)
 165     *mlog << '\n' << _f ("approximated %s", approx_stats_.str ()) << endl;
 166   if (exact_stats_.count_i_)
 167     *mlog << _f ("calculated %s exactly", exact_stats_.str ()) << endl;
 168   *mlog << _f ("elapsed time %.2f seconds",  timer.read ()) << endl;
 169
 170   return h;
 171 }
 172
 173 void
 174 Break_algorithm::do_set_pscore ()
 175 {
 176
 177 }