Use scalar instead of embedded_scm for context mod overrides.
[lilypond/mpolesky.git] / lily / spacing-loose-columns.cc
blob302cccb13340361e72360e11fbc730a9d6edc7cf
1 /*
2 spacing-loose-columns.cc -- implement loose column spacing.
4 source file of the GNU LilyPond music typesetter
6 (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
7 */
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"
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)
25 int loose_col_count = posns->loose_cols_.size ();
26 if (!loose_col_count)
27 return;
29 for (int i = 0; i < loose_col_count; i++)
31 int divide_over = 1;
32 Item *loose = dynamic_cast<Item *> (posns->loose_cols_[i]);
33 Paper_column *col = dynamic_cast<Paper_column *> (loose);
35 if (col->get_system ())
36 continue;
38 Item *left = 0;
39 Item *right = 0;
41 vector<Item*> clique;
42 while (1)
44 SCM between = loose->get_object ("between-cols");
45 if (!scm_is_pair (between))
46 break;
48 Item *le = dynamic_cast<Item *> (unsmob_grob (scm_car (between)));
49 Item *re = dynamic_cast<Item *> (unsmob_grob (scm_cdr (between)));
51 if (! (le && re))
52 break;
54 if (!left && le)
56 left = le->get_column ();
57 if (!left->get_system ())
58 left = left->find_prebroken_piece (RIGHT);
60 clique.push_back (left);
63 clique.push_back (loose);
65 divide_over++;
66 loose = right = re->get_column ();
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))
76 right = which->get_bound (RIGHT);
77 else
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++)
86 if (base_cols[j]->get_system () == which)
87 right = dynamic_cast<Item*> ((Grob*)base_cols[j]);
92 if (!right)
94 programming_error ("Can't attach loose column sensibly. Attaching to end of system.");
95 right = which->get_bound (RIGHT);
97 Grob *common = right->common_refpoint (left, X_AXIS);
99 clique.push_back (right);
101 vector<Real> clique_spacing;
102 clique_spacing.push_back (0.0);
103 for (vsize j = 1; j + 1 < clique.size (); j ++)
105 Grob *clique_col = clique[j];
107 Paper_column *loose_col = dynamic_cast<Paper_column *> (clique[j]);
108 Paper_column *next_col = dynamic_cast<Paper_column *> (clique[j + 1]);
110 Grob *spacing = unsmob_grob (clique_col->get_object ("spacing"));
111 if (Grob *grace_spacing = unsmob_grob (clique_col->get_object ("grace-spacing")))
113 spacing = grace_spacing;
116 Spacing_options options;
117 if (spacing)
118 options.init_from_grob (spacing);
119 else
120 programming_error ("Column without spacing object");
122 Real base_note_space = 0.0;
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
130 Spring spring = Spacing_spanner::standard_breakable_column_spacing (spacing,
131 loose_col, next_col,
132 &options);
134 base_note_space = spring.distance ();
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]);
141 clique_spacing.push_back (base_note_space);
144 Real default_padding = 1.0;
145 clique_spacing.push_back (default_padding);
147 Real right_point = robust_relative_extent (clique.back (), common, X_AXIS)[LEFT];
150 Grob *finished_right_column = clique.back ();
152 for (vsize j = clique.size () - 2; j > 0; j--)
154 Paper_column *clique_col = dynamic_cast<Paper_column *> (clique[j]);
156 right_point = finished_right_column->relative_coordinate (common, X_AXIS);
158 Real distance_to_next = clique_spacing[j];
160 Real my_offset = right_point - distance_to_next;
162 clique_col->set_system (which);
163 clique_col->translate_axis (my_offset - clique_col->relative_coordinate (common, X_AXIS), X_AXIS);
165 finished_right_column = clique_col;