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spacing-determine-loose-columns.cc -- implement Spacing_spanner
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methods that decide which columns to turn loose.
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source file of the GNU LilyPond music typesetter
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(c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
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#include "staff-spacing.hh"
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#include "paper-column.hh"
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#include "column-x-positions.hh"
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#include "pointer-group-interface.hh"
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#include "spacing-spanner.hh"
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#include "note-spacing.hh"
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#include "break-align-interface.hh"
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Return whether COL is fixed to its neighbors by some kind of spacing
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If in doubt, then we're not loose; the spacing engine should space
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for it, risking suboptimal spacing.
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(Otherwise, we might risk core dumps, and other weird stuff.)
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is_loose_column (Grob *l, Grob *c, Grob *r, Spacing_options const *options)
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if (options->float_nonmusical_columns_
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&& Paper_column::when_mom (c).grace_part_)
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if (Paper_column::is_musical (c)
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|| Item::is_breakable (c))
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extract_grob_set (c, "right-neighbors", rns);
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extract_grob_set (c, "left-neighbors", lns);
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If this column doesn't have a proper neighbor, we should really
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make it loose, but spacing it correctly is more than we can
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(this happens in the following situation:
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the column containing the clef is really loose, and should be
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attached right to the first column, but that is a lot of work for
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such a borderline case.)
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if (lns.empty () || rns.empty ())
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Item *l_neighbor = dynamic_cast<Item *> (lns[0]);
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Item *r_neighbor = dynamic_cast<Item *> (rns[0]);
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if (!l_neighbor || !r_neighbor)
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l_neighbor = l_neighbor->get_column ();
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r_neighbor = dynamic_cast<Item *> (Note_spacing::right_column (r_neighbor));
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if (l == l_neighbor && r == r_neighbor)
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if (!l_neighbor || !r_neighbor)
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Only declare loose if the bounds make a little sense. This means
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some cases (two isolated, consecutive clef changes) won't be
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nicely folded, but hey, then don't do that.
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if (! ((Paper_column::is_musical (l_neighbor) || Item::is_breakable (l_neighbor))
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&& (Paper_column::is_musical (r_neighbor) || Item::is_breakable (r_neighbor))))
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A rather hairy check, but we really only want to move around
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clefs. (anything else?)
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in any case, we don't want to move bar lines.
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extract_grob_set (c, "elements", elts);
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for (vsize i = elts.size (); i--;)
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if (g && Break_align_interface::has_interface (g))
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extract_grob_set (g, "elements", gelts);
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for (vsize j = gelts.size (); j--;)
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ugh. -- fix staff-bar name?
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if (h && h->get_property ("break-align-symbol") == ly_symbol2scm ("staff-bar"))
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Remove columns that are not tightly fitting from COLS. In the
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removed columns, set 'between-cols to the columns where it is in
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Spacing_spanner::prune_loose_columns (Grob *me, vector<Grob*> *cols,
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Spacing_options const *options)
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vector<Grob*> newcols;
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for (vsize i = 0; i < cols->size (); i++)
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Grob *c = cols->at (i);
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bool loose = (i > 0 && i < cols->size () - 1)
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&& is_loose_column (cols->at (i - 1), c, cols->at (i + 1), options);
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extract_grob_set (c, "right-neighbors", rns_arr);
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extract_grob_set (c, "left-neighbors", lns_arr);
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SCM lns = lns_arr.size () ? lns_arr.back ()->self_scm () : SCM_BOOL_F;
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SCM rns = rns_arr.size () ? rns_arr.back ()->self_scm () : SCM_BOOL_F;
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Either object can be non existent, if the score ends
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extract_grob_set (unsmob_grob (rns), "right-items", right_items);
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c->set_object ("between-cols", scm_cons (lns,
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right_items[0]->self_scm ()));
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Set distance constraints for loose columns
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Drul_array<Grob *> next_door;
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next_door[LEFT] = cols->at (i - 1);
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next_door[RIGHT] = cols->at (i + 1);
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Drul_array<Real> dists (0, 0);
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Item *lc = dynamic_cast<Item *> ((d == LEFT) ? next_door[LEFT] : c);
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Item *rc = dynamic_cast<Item *> (d == LEFT ? c : next_door[RIGHT]);
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extract_grob_set (lc, "spacing-wishes", wishes);
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for (vsize k = wishes.size (); k--;)
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Grob *sp = wishes[k];
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if (Note_spacing::left_column (sp) != lc
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|| Note_spacing::right_column (sp) != rc)
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if (Note_spacing::has_interface (sp))
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The note spacing should be taken from the musical
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Real base = note_spacing (me, lc, rc, options, &dummy);
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Note_spacing::get_spacing (sp, rc, base, options->increment_, &space, &fixed);
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space -= options->increment_;
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dists[d] = max (dists[d], space);
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else if (Staff_spacing::has_interface (sp))
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Real space, fixed_space;
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Staff_spacing::get_spacing_params (sp,
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&space, &fixed_space);
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dists[d] = max (dists[d], fixed_space);
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programming_error ("Subversive spacing wish");
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while (flip (&d) != LEFT);
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r.distance_ = dists[LEFT] + dists[RIGHT];
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r.item_drul_[LEFT] = dynamic_cast<Item *> (cols->at (i - 1));
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r.item_drul_[RIGHT] = dynamic_cast<Item *> (cols->at (i + 1));
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newcols.push_back (c);
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Set neighboring columns determined by the spacing-wishes grob property.
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Spacing_spanner::set_explicit_neighbor_columns (vector<Grob*> const &cols)
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for (vsize i = 0; i < cols.size (); i++)
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SCM right_neighbors = Grob_array::make_array ();
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Grob_array *rn_arr = unsmob_grob_array (right_neighbors);
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int min_rank = 100000; // inf.
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extract_grob_set (cols[i], "spacing-wishes", wishes);
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for (vsize k = wishes.size (); k--;)
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Item *wish = dynamic_cast<Item *> (wishes[k]);
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Item *lc = wish->get_column ();
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Grob *right = Note_spacing::right_column (wish);
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Item *rc = dynamic_cast<Item *> (right);
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int right_rank = Paper_column::get_rank (rc);
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int left_rank = Paper_column::get_rank (lc);
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update the left column.
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if (right_rank <= min_rank)
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if (right_rank < min_rank)
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min_rank = right_rank;
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update the right column of the wish.
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extract_grob_set (rc, "left-neighbors", lns_arr);
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Item *it = dynamic_cast<Item *> (lns_arr.back ());
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maxrank = Paper_column::get_rank (it->get_column ());
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if (left_rank >= maxrank)
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if (left_rank > maxrank)
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Grob_array *ga = unsmob_grob_array (rc->get_object ("left-neighbors"));
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Pointer_group_interface::add_grob (rc, ly_symbol2scm ("left-neighbors"), wish);
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cols[i]->set_object ("right-neighbors", right_neighbors);
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Set neighboring columns that have no left/right-neighbor set
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yet. Only do breakable non-musical columns, and musical columns.
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Spacing_spanner::set_implicit_neighbor_columns (vector<Grob*> const &cols)
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for (vsize i = 0; i < cols.size (); i++)
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Item *it = dynamic_cast<Item *> (cols[i]);
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if (!Item::is_breakable (it) && !Paper_column::is_musical (it))
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// it->breakable || it->musical
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sloppy with typing left/right-neighbors should take list, but paper-column found instead.
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extract_grob_set (cols[i], "left-neighbors", lns);
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if (lns.empty () && i)
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SCM ga_scm = Grob_array::make_array ();
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Grob_array *ga = unsmob_grob_array (ga_scm);
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ga->add (cols[i - 1]);
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cols[i]->set_object ("left-neighbors", ga_scm);
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extract_grob_set (cols[i], "right-neighbors", rns);
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if (rns.empty () && i < cols.size () - 1)
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SCM ga_scm = Grob_array::make_array ();
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Grob_array *ga = unsmob_grob_array (ga_scm);
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ga->add (cols[i + 1]);
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cols[i]->set_object ("right-neighbors", ga_scm);