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
  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   for (int i = 0; i < loose_col_count; i++)
  29     {
  30       int divide_over = 1;
  31       Item *loose = dynamic_cast<Item *> (posns->loose_cols_[i]);
  32       Paper_column *col = dynamic_cast<Paper_column *> (loose);
  33
  34       if (col->get_system ())
  35         continue;
  36
  37       Item *left = 0;
  38       Item *right = 0;
  39
  40       vector<Item*> clique;
  41       while (1)
  42         {
  43           SCM between = loose->get_object ("between-cols");
  44           if (!scm_is_pair (between))
  45             break;
  46
  47           Item *le = dynamic_cast<Item *> (unsmob_grob (scm_car (between)));
  48           Item *re = dynamic_cast<Item *> (unsmob_grob (scm_cdr (between)));
  49
  50           if (! (le && re))
  51             break;
  52
  53           if (!left && le)
  54             {
  55               left = le->get_column ();
  56               if (!left->get_system ())
  57                 left = left->find_prebroken_piece (RIGHT);
  58
  59               clique.push_back (left);
  60             }
  61
  62           clique.push_back (loose);
  63
  64           divide_over++;
  65           loose = right = re->get_column ();
  66         }
  67
  68       if (!right->get_system ())
  69         right = right->find_prebroken_piece (LEFT);
  70
  71       Grob *common = right->common_refpoint (left, X_AXIS);
  72
  73       clique.push_back (right);
  74
  75       vector<Real> clique_spacing;
  76       clique_spacing.push_back (0.0);
  77       for (vsize j = 1; j < clique.size () - 1; j ++)
  78         {
  79           Grob *clique_col = clique[j];
  80
  81           Paper_column *loose_col = dynamic_cast<Paper_column *> (clique[j]);
  82           Paper_column *next_col = dynamic_cast<Paper_column *> (clique[j + 1]);
  83
  84           Grob *spacing = unsmob_grob (clique_col->get_object ("spacing"));
  85           if (Grob *grace_spacing = unsmob_grob (clique_col->get_object ("grace-spacing")))
  86             {
  87               spacing = grace_spacing;
  88             }
  89
  90           Spacing_options options;
  91           if (spacing)
  92             options.init_from_grob (spacing);
  93           else
  94             programming_error ("Column without spacing object");
  95
  96           bool expand_only = false;
  97           Real base_note_space = 0.0;
  98
  99           if (Paper_column::is_musical (next_col)
 100               && Paper_column::is_musical (loose_col))
 101             base_note_space = Spacing_spanner::note_spacing (spacing, loose_col, next_col,
 102                                                              &options, &expand_only);
 103           else
 104             {
 105               Real fixed, space;
 106
 107               Spacing_spanner::standard_breakable_column_spacing (spacing,
 108                                                                   loose_col, next_col,
 109                                                                   &fixed, &space,
 110                                                                   &options);
 111
 112               base_note_space = space;
 113             }
 114
 115           base_note_space = max (base_note_space,
 116                                  robust_relative_extent (loose_col, loose_col, X_AXIS)[RIGHT]
 117                                  - robust_relative_extent (next_col, next_col, X_AXIS)[LEFT]);
 118
 119           clique_spacing.push_back (base_note_space);
 120         }
 121
 122       Real default_padding = 1.0;
 123       clique_spacing.push_back (default_padding);
 124
 125       Real right_point = robust_relative_extent (clique.back (), common, X_AXIS)[LEFT];
 126
 127
 128       Grob *finished_right_column = clique.back ();
 129
 130       for (vsize j = clique.size () - 2; j > 0; j--)
 131         {
 132           Paper_column *clique_col = dynamic_cast<Paper_column *> (clique[j]);
 133
 134           right_point = finished_right_column->relative_coordinate (common, X_AXIS);
 135
 136           Real distance_to_next = clique_spacing[j];
 137
 138           Real my_offset = right_point - distance_to_next;
 139
 140           clique_col->set_system (which);
 141           clique_col->translate_axis (my_offset - clique_col->relative_coordinate (common, X_AXIS), X_AXIS);
 142
 143           finished_right_column = clique_col;
 144         }
 145
 146     }
 147 }
 148