lily/spacing-loose-columns.cc

   1 /*
   2   spacing-loose-columns.cc -- implement loose column spacing.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "system.hh"
  10 #include "paper-column.hh"
  11 #include "column-x-positions.hh"
  12 #include "pointer-group-interface.hh"
  13 #include "staff-spacing.hh"
  14 #include "note-spacing.hh"
  15 #include "spacing-spanner.hh"
  16
  17 #include "moment.hh"
  18
  19 /* Find the loose columns in POSNS, and drape them around the columns
  20    specified in BETWEEN-COLS.  */
  21 void
  22 set_loose_columns (System *which, Column_x_positions const *posns)
  23 {
  24   int loose_col_count = posns->loose_cols_.size ();
  25   if (!loose_col_count)
  26     return;
  27
  28   Real default_padding = 1.0;
  29   for (int i = 0; i < loose_col_count; i++)
  30     {
  31       int divide_over = 1;
  32       Item *loose = dynamic_cast<Item *> (posns->loose_cols_[i]);
  33       Paper_column *col = dynamic_cast<Paper_column *> (loose);
  34
  35       if (col->get_system ())
  36         continue;
  37
  38       Item *left = 0;
  39       Item *right = 0;
  40
  41       vector<Item*> clique;
  42       while (1)
  43         {
  44           SCM between = loose->get_object ("between-cols");
  45           if (!scm_is_pair (between))
  46             break;
  47
  48           Item *le = dynamic_cast<Item *> (unsmob_grob (scm_car (between)));
  49           Item *re = dynamic_cast<Item *> (unsmob_grob (scm_cdr (between)));
  50
  51           if (! (le && re))
  52             break;
  53
  54           if (!left && le)
  55             {
  56               left = le->get_column ();
  57               if (!left->get_system ())
  58                 left = left->find_prebroken_piece (RIGHT);
  59
  60               clique.push_back (left);
  61             }
  62
  63           clique.push_back (loose);
  64
  65           divide_over++;
  66           loose = right = re->get_column ();
  67         }
  68
  69       if (!right->get_system ())
  70         right = right->find_prebroken_piece (LEFT);
  71
  72       clique.push_back (right);
  73
  74       Grob *common = right->common_refpoint (left, X_AXIS);
  75       Item *finished_right_column = clique.back ();
  76
  77       for (vsize j = clique.size () - 2; j > 0; j--)
  78         {
  79           int count = 0;
  80           Real total_space = 0.0;
  81           Real total_fixed = 0.0;
  82
  83           extract_grob_set (col, "spacing-wishes", wishes);
  84           for (vsize i = 0; i < wishes.size (); i++)
  85             {
  86               Grob *spacing = wishes[i];
  87               Real space = 0.0;
  88               Real fixed = 0.0;
  89
  90               if (Staff_spacing::has_interface (spacing))
  91                 Staff_spacing::get_spacing_params (spacing, &space, &fixed);
  92               else if (Note_spacing::has_interface (spacing))
  93                 {
  94                   Spacing_options options;
  95
  96                   fixed = robust_relative_extent (col, col, X_AXIS)[RIGHT];
  97
  98                   Moment dt = Paper_column::when_mom (right) - Paper_column::when_mom (col);
  99                   bool expand = false;
 100                   space = options.get_duration_space (dt, &expand);
 101                   Note_spacing::get_spacing (spacing, right, space, options.increment_,
 102                                              &space, &fixed);
 103                 }
 104               else
 105                 continue;
 106
 107               count++;
 108
 109               total_space += space;
 110               total_fixed += fixed;
 111             }
 112
 113           Real distance_to_next = 0.0;
 114           Real right_point = 0.0;
 115           if (count)
 116             {
 117               total_space /= count;
 118               total_fixed /= count;
 119
 120               distance_to_next = total_space;
 121               right_point
 122                 = finished_right_column->relative_coordinate (common, X_AXIS);
 123             }
 124           else
 125             {
 126               Interval my_extent = robust_relative_extent (col, col, X_AXIS);
 127               distance_to_next = my_extent[RIGHT] + default_padding;
 128               right_point = robust_relative_extent (finished_right_column, common, X_AXIS)[LEFT];
 129             }
 130
 131           Real my_offset = right_point - distance_to_next;
 132
 133           col->system_ = which;
 134           col->translate_axis (my_offset - col->relative_coordinate (common, X_AXIS), X_AXIS);
 135
 136           finished_right_column = col;
 137         }
 138     }
 139 }
 140