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 #include "warn.hh"
  17 #include "moment.hh"
  18 #include "spacing-options.hh"
  19
  20 /* Find the loose columns in POSNS, and drape them around the columns
  21    specified in BETWEEN-COLS.  */
  22 void
  23 set_loose_columns (System *which, Column_x_positions const *posns)
  24 {
  25   int loose_col_count = posns->loose_cols_.size ();
  26   if (!loose_col_count)
  27     return;
  28
  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       Grob *common = right->common_refpoint (left, X_AXIS);
  73
  74       clique.push_back (right);
  75
  76       vector<Real> clique_spacing;
  77       clique_spacing.push_back (0.0);
  78       for (vsize j = 1; j < clique.size () - 1; j ++)
  79         {
  80           Grob *clique_col = clique[j];
  81
  82           Paper_column *loose_col = dynamic_cast<Paper_column *> (clique[j]);
  83           Paper_column *next_col = dynamic_cast<Paper_column *> (clique[j + 1]);
  84
  85           Grob *spacing = unsmob_grob (clique_col->get_object ("spacing"));
  86           if (Grob *grace_spacing = unsmob_grob (clique_col->get_object ("grace-spacing")))
  87             {
  88               spacing = grace_spacing;
  89             }
  90
  91           Spacing_options options;
  92           if (spacing)
  93             options.init_from_grob (spacing);
  94           else
  95             programming_error ("Column without spacing object");
  96
  97           bool expand_only = false;
  98           Real base_note_space = 0.0;
  99
 100           if (Paper_column::is_musical (next_col)
 101               && Paper_column::is_musical (loose_col))
 102             base_note_space = Spacing_spanner::note_spacing (spacing, loose_col, next_col,
 103                                                              &options, &expand_only);
 104           else
 105             {
 106               Real fixed, space;
 107
 108               Spacing_spanner::standard_breakable_column_spacing (spacing,
 109                                                                   loose_col, next_col,
 110                                                                   &fixed, &space,
 111                                                                   &options);
 112
 113               base_note_space = space;
 114             }
 115
 116           base_note_space = max (base_note_space,
 117                                  robust_relative_extent (loose_col, loose_col, X_AXIS)[RIGHT]
 118                                  - robust_relative_extent (next_col, next_col, X_AXIS)[LEFT]);
 119
 120           clique_spacing.push_back (base_note_space);
 121         }
 122
 123       Real default_padding = 1.0;
 124       clique_spacing.push_back (default_padding);
 125
 126       Real right_point = robust_relative_extent (clique.back (), common, X_AXIS)[LEFT];
 127
 128
 129       Grob *finished_right_column = clique.back ();
 130
 131       for (vsize j = clique.size () - 2; j > 0; j--)
 132         {
 133           Paper_column *clique_col = dynamic_cast<Paper_column *> (clique[j]);
 134
 135           right_point = finished_right_column->relative_coordinate (common, X_AXIS);
 136
 137           Real distance_to_next = clique_spacing[j];
 138
 139           Real my_offset = right_point - distance_to_next;
 140
 141           clique_col->set_system (which);
 142           clique_col->translate_axis (my_offset - clique_col->relative_coordinate (common, X_AXIS), X_AXIS);
 143
 144           finished_right_column = clique_col;
 145         }
 146
 147     }
 148 }
 149