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->find_prebroken_piece (LEFT)
  71           && right->find_prebroken_piece (LEFT)->get_system () == which)
  72         right = right->find_prebroken_piece (LEFT);
  73       else if (Paper_column::get_rank (which->get_bound (RIGHT)) < Paper_column::get_rank (right))
  74
  75         right = which->get_bound (RIGHT);
  76       else
  77         {
  78           clique.back ()->programming_error ("Loose column does not have right side to attach to.");
  79           right = which->get_bound (RIGHT);
  80         }
  81
  82       Grob *common = right->common_refpoint (left, X_AXIS);
  83
  84       clique.push_back (right);
  85
  86       vector<Real> clique_spacing;
  87       clique_spacing.push_back (0.0);
  88       for (vsize j = 1; j < clique.size () - 1; j ++)
  89         {
  90           Grob *clique_col = clique[j];
  91
  92           Paper_column *loose_col = dynamic_cast<Paper_column *> (clique[j]);
  93           Paper_column *next_col = dynamic_cast<Paper_column *> (clique[j + 1]);
  94
  95           Grob *spacing = unsmob_grob (clique_col->get_object ("spacing"));
  96           if (Grob *grace_spacing = unsmob_grob (clique_col->get_object ("grace-spacing")))
  97             {
  98               spacing = grace_spacing;
  99             }
 100
 101           Spacing_options options;
 102           if (spacing)
 103             options.init_from_grob (spacing);
 104           else
 105             programming_error ("Column without spacing object");
 106
 107           bool expand_only = false;
 108           Real base_note_space = 0.0;
 109
 110           if (Paper_column::is_musical (next_col)
 111               && Paper_column::is_musical (loose_col))
 112             base_note_space = Spacing_spanner::note_spacing (spacing, loose_col, next_col,
 113                                                              &options, &expand_only);
 114           else
 115             {
 116               Real fixed, space;
 117
 118               Spacing_spanner::standard_breakable_column_spacing (spacing,
 119                                                                   loose_col, next_col,
 120                                                                   &fixed, &space,
 121                                                                   &options);
 122
 123               base_note_space = space;
 124             }
 125
 126           base_note_space = max (base_note_space,
 127                                  robust_relative_extent (loose_col, loose_col, X_AXIS)[RIGHT]
 128                                  - robust_relative_extent (next_col, next_col, X_AXIS)[LEFT]);
 129
 130           clique_spacing.push_back (base_note_space);
 131         }
 132
 133       Real default_padding = 1.0;
 134       clique_spacing.push_back (default_padding);
 135
 136       Real right_point = robust_relative_extent (clique.back (), common, X_AXIS)[LEFT];
 137
 138
 139       Grob *finished_right_column = clique.back ();
 140
 141       for (vsize j = clique.size () - 2; j > 0; j--)
 142         {
 143           Paper_column *clique_col = dynamic_cast<Paper_column *> (clique[j]);
 144
 145           right_point = finished_right_column->relative_coordinate (common, X_AXIS);
 146
 147           Real distance_to_next = clique_spacing[j];
 148
 149           Real my_offset = right_point - distance_to_next;
 150
 151           clique_col->set_system (which);
 152           clique_col->translate_axis (my_offset - clique_col->relative_coordinate (common, X_AXIS), X_AXIS);
 153
 154           finished_right_column = clique_col;
 155         }
 156
 157     }
 158 }
 159