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--2007 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         ; /* do nothing */
  71       else if (right->find_prebroken_piece (LEFT)
  72                && right->find_prebroken_piece (LEFT)->get_system () == which)
  73         right = right->find_prebroken_piece (LEFT);
  74       else if (Paper_column::get_rank (which->get_bound (RIGHT)) < Paper_column::get_rank (right))
  75
  76         right = which->get_bound (RIGHT);
  77       else
  78         {
  79           clique.back ()->programming_error ("Loose column does not have right side to attach to.");
  80           System *base_system = dynamic_cast<System*> (which->original ());
  81           int j = Paper_column::get_rank (clique.back ()) + 1;
  82           int end_rank = Paper_column::get_rank (which->get_bound (RIGHT));
  83           extract_grob_set (base_system, "columns", base_cols);
  84           for (; j < end_rank; j++)
  85             {
  86               if (base_cols[j]->get_system () == which)
  87                 right = dynamic_cast<Item*> ((Grob*)base_cols[j]);
  88             }
  89         }
  90
  91
  92       if (!right)
  93         {
  94           programming_error ("Can't attach loose column sensibly. Attaching to end of system.");
  95           right = which->get_bound (RIGHT);
  96         }
  97       Grob *common = right->common_refpoint (left, X_AXIS);
  98
  99       clique.push_back (right);
 100
 101       vector<Real> clique_spacing;
 102       clique_spacing.push_back (0.0);
 103       for (vsize j = 1; j + 1 < clique.size (); j ++)
 104         {
 105           Grob *clique_col = clique[j];
 106
 107           Paper_column *loose_col = dynamic_cast<Paper_column *> (clique[j]);
 108           Paper_column *next_col = dynamic_cast<Paper_column *> (clique[j + 1]);
 109
 110           Grob *spacing = unsmob_grob (clique_col->get_object ("spacing"));
 111           if (Grob *grace_spacing = unsmob_grob (clique_col->get_object ("grace-spacing")))
 112             {
 113               spacing = grace_spacing;
 114             }
 115
 116           Spacing_options options;
 117           if (spacing)
 118             options.init_from_grob (spacing);
 119           else
 120             programming_error ("Column without spacing object");
 121
 122           Real base_note_space = 0.0;
 123
 124           if (Paper_column::is_musical (next_col)
 125               && Paper_column::is_musical (loose_col))
 126             base_note_space = Spacing_spanner::note_spacing (spacing, loose_col, next_col,
 127                                                              &options);
 128           else
 129             {
 130               Spring spring = Spacing_spanner::standard_breakable_column_spacing (spacing,
 131                                                                                   loose_col, next_col,
 132                                                                                   &options);
 133
 134               base_note_space = spring.distance ();
 135             }
 136
 137           base_note_space = max (base_note_space,
 138                                  robust_relative_extent (loose_col, loose_col, X_AXIS)[RIGHT]
 139                                  - robust_relative_extent (next_col, next_col, X_AXIS)[LEFT]);
 140
 141           clique_spacing.push_back (base_note_space);
 142         }
 143
 144       Real default_padding = 1.0;
 145       clique_spacing.push_back (default_padding);
 146
 147       Real right_point = robust_relative_extent (clique.back (), common, X_AXIS)[LEFT];
 148
 149
 150       Grob *finished_right_column = clique.back ();
 151
 152       for (vsize j = clique.size () - 2; j > 0; j--)
 153         {
 154           Paper_column *clique_col = dynamic_cast<Paper_column *> (clique[j]);
 155
 156           right_point = finished_right_column->relative_coordinate (common, X_AXIS);
 157
 158           Real distance_to_next = clique_spacing[j];
 159
 160           Real my_offset = right_point - distance_to_next;
 161
 162           clique_col->set_system (which);
 163           clique_col->translate_axis (my_offset - clique_col->relative_coordinate (common, X_AXIS), X_AXIS);
 164
 165           finished_right_column = clique_col;
 166         }
 167
 168     }
 169 }
 170