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 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9
  10 #include "break.hh"
  11 #include "paper-def.hh"
  12 #include "line-spacer.hh"
  13 #include "debug.hh"
  14 #include "scoreline.hh"
  15 #include "p-score.hh"
  16 #include "p-col.hh"
  17 #include "cpu-timer.hh"
  18
  19 String
  20 Col_stats::str() const {
  21   String s (count_i_);
  22   s += " lines";
  23   if  (count_i_)
  24     s += String (Real (cols_i_)/count_i_, ", (with an average of %.1f columns)");
  25
  26   return s;
  27 }
  28
  29 void
  30 Col_stats::add (Line_of_cols const& line)
  31 {
  32   count_i_++;
  33   cols_i_ += line.size();
  34 }
  35
  36
  37 Col_stats::Col_stats()
  38 {
  39   count_i_ =0;
  40   cols_i_ =0;
  41 }
  42
  43 /* **************************************************************** */
  44
  45 Line_of_cols
  46 Break_algorithm::all_cols() const
  47 {
  48   Line_of_cols retval;
  49   for (PCursor<Paper_column*> c (pscore_l_->col_p_list_.top());
  50        c.ok(); c++)
  51     {
  52
  53       retval.push (c);
  54     }
  55   return retval;
  56 }
  57
  58 Array<int>
  59 Break_algorithm::find_break_indices() const
  60 {
  61   Line_of_cols all (all_cols());
  62   Array<int> retval;
  63
  64   for (int i=0; i < all.size(); i++)
  65     if (all[i]->breakable_b_)
  66       retval.push (i);
  67
  68   if (linelength <=0)
  69     while (retval.size() >2)
  70       retval.del (1);
  71
  72   return retval;
  73 }
  74
  75 ///  return all breakable columns
  76 Line_of_cols
  77 Break_algorithm::find_breaks() const
  78 {
  79   Line_of_cols all (all_cols());
  80   Line_of_cols retval;
  81
  82   for (int i=0; i < all.size(); i++)
  83     if (all[i]->breakable_b_)
  84       retval.push (all[i]);
  85
  86
  87   if (linelength <=0)
  88     while (retval.size() >2)
  89       retval.del (1);
  90
  91   return retval;
  92 }
  93
  94
  95
  96
  97
  98 Line_spacer*
  99 Break_algorithm::generate_spacing_problem (Line_of_cols curline) const
 100 {
 101   Line_spacer * sp= (*get_line_spacer)();
 102
 103   sp->paper_l_ = pscore_l_->paper_l_;
 104   sp->add_column (curline[0], true, 0.0);
 105   for (int i=1; i< curline.size()-1; i++)
 106     sp->add_column (curline[i]);
 107
 108   if (linelength > 0)
 109     sp->add_column (curline.top(), true, linelength);
 110   else
 111     sp->add_column (curline.top());
 112
 113   sp->prepare();
 114   return sp;
 115 }
 116
 117 Break_algorithm::Break_algorithm()
 118 {
 119   pscore_l_ = 0;
 120   get_line_spacer =0;
 121   linelength = 0;
 122 }
 123
 124 void
 125 Break_algorithm::set_pscore (Paper_score*s)
 126 {
 127   pscore_l_ = s;
 128   linelength = s->paper_l_->linewidth_f();
 129   do_set_pscore();
 130 }
 131
 132 bool
 133 Break_algorithm::feasible (Line_of_cols curline) const
 134 {
 135   if (linelength <=  0)
 136     return true;
 137
 138   Real l =0;
 139   for (int i=0; i < curline.size(); i++)
 140     l +=curline[i]->width().length ();
 141   return l < linelength;
 142 }
 143
 144 void
 145 Break_algorithm::problem_OK() const
 146 {
 147   if (!pscore_l_->col_p_list_.size())
 148     error ("Score does not have any columns");
 149   OK();
 150 }
 151
 152 void
 153 Break_algorithm::OK() const
 154 {
 155 #ifndef NDEBUG
 156   iter_top (pscore_l_->col_p_list_,start);
 157   PCursor<Paper_column *> end (pscore_l_->col_p_list_.bottom());
 158
 159   assert (start->breakable_b_);
 160   assert (end->breakable_b_);
 161 #endif
 162 }
 163
 164 Array<Col_hpositions>
 165 Break_algorithm::solve() const
 166 {
 167   Cpu_timer timer;
 168
 169   Array<Col_hpositions> h= do_solve();
 170
 171   if (approx_stats_.count_i_)
 172     *mlog << "\nApproximated: " << approx_stats_.str() << "\n";
 173   if (exact_stats_.count_i_)
 174     *mlog << "Calculated exactly: " << exact_stats_.str() << "\n";
 175   *mlog << "Time: " << String(timer.read (), "%.2f") << " seconds\n";
 176
 177   return h;
 178 }
 179
 180 void
 181 Break_algorithm::do_set_pscore()
 182 {
 183
 184 }
 185