-/*
- spacing-spanner.cc -- implement Spacing_spanner
-
+/*
+ spacing-spanner.cc -- implement Spacing_spanner
+
source file of the GNU LilyPond music typesetter
-
- (c) 1999--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-
- */
+
+ (c) 1999--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
#include "spacing-spanner.hh"
+
+#include <math.h>
+#include <cstdio>
+using namespace std;
+
+#include "international.hh"
+#include "main.hh"
+#include "moment.hh"
+#include "note-spacing.hh"
+#include "output-def.hh"
#include "paper-column.hh"
-#include "dimensions.hh"
-#include "paper-def.hh"
-#include "warn.hh"
#include "paper-score.hh"
-#include "line-of-score.hh"
-#include "misc.hh"
+#include "pointer-group-interface.hh"
+#include "spaceable-grob.hh"
+#include "spacing-interface.hh"
+#include "staff-spacing.hh"
+#include "system.hh"
+#include "warn.hh"
-void
-Spacing_spanner::set_interface (Grob*me)
-{
- me->set_extent_callback (SCM_EOL, X_AXIS);
- me->set_extent_callback (SCM_EOL, Y_AXIS) ;
-}
/*
+ TODO:
- The algorithm is partly taken from :
+ use callback instead?
- John S. Gourlay. ``Spacing a Line of Music,'' Technical Report
- OSU-CISRC-10/87-TR35, Department of Computer and Information
- Science, The Ohio State University, 1987.
+*/
+Rational
+Spacing_spanner::effective_shortest_duration (Grob *me,
+ vector<Grob*> const &all)
+{
+ SCM preset_shortest = me->get_property ("common-shortest-duration");
+ Rational global_shortest;
+ if (unsmob_moment (preset_shortest))
+ global_shortest = unsmob_moment (preset_shortest)->main_part_;
+ else
+ {
+ global_shortest = Spacing_spanner::find_shortest (me, all);
+ if (be_verbose_global)
+ message (_f ("Global shortest duration is %s", global_shortest.to_string ()) + "\n");
+ }
- TOO HAIRY.
+ return global_shortest;
+}
- TODO: write comments
-
- */
-void
-Spacing_spanner::do_measure (Grob*me, Link_array<Grob> cols)
+
+MAKE_SCHEME_CALLBACK (Spacing_spanner, set_springs, 1);
+SCM
+Spacing_spanner::set_springs (SCM smob)
{
- Moment shortest;
- Moment mean_shortest;
+ Spanner *me = unsmob_spanner (smob);
/*
- space as if this duration is present.
- */
- Moment base_shortest_duration = *unsmob_moment (me->get_grob_property ("maximum-duration-for-spacing"));
- shortest.set_infinite (1);
+ can't use get_system() ? --hwn.
+ */
+ vector<Grob*> all (get_root_system (me)->columns ());
+ vsize start = binary_search (all, (Grob*)me->get_bound (LEFT),
+ &Paper_column::compare);
+ vsize end = binary_search (all, (Grob*) me->get_bound (RIGHT),
+ &Paper_column::compare);
+
+ all = vector<Grob*>::vector<Grob*> (all.begin () + start,
+ all.begin () + end + 1);
+
+ set_explicit_neighbor_columns (all);
- int n = 0;
- for (int i =0 ; i < cols.size (); i++)
+ Spacing_options options;
+ options.init_from_grob (me);
+ options.global_shortest_ = effective_shortest_duration (me, all);
+
+ prune_loose_columns (me, &all, &options);
+ set_implicit_neighbor_columns (all);
+ generate_springs (me, all, &options);
+
+ return SCM_UNSPECIFIED;
+}
+
+/*
+ We want the shortest note that is also "common" in the piece, so we
+ find the shortest in each measure, and take the most frequently
+ found duration.
+
+ This probably gives weird effects with modern music, where every
+ note has a different duration, but hey, don't write that kind of
+ stuff, then.
+*/
+Rational
+Spacing_spanner::find_shortest (Grob *me, vector<Grob*> const &cols)
+{
+ /*
+ ascending in duration
+ */
+ vector<Rational> durations;
+ vector<int> counts;
+
+ Rational shortest_in_measure;
+ shortest_in_measure.set_infinite (1);
+
+ for (vsize i = 0; i < cols.size (); i++)
{
- if (dynamic_cast<Paper_column*> (cols[i])->musical_b ())
+ if (Paper_column::is_musical (cols[i]))
+ {
+ Moment *when = unsmob_moment (cols[i]->get_property ("when"));
+
+ /*
+ ignore grace notes for shortest notes.
+ */
+ if (when && when->grace_part_)
+ continue;
+
+ SCM st = cols[i]->get_property ("shortest-starter-duration");
+ Moment this_shortest = *unsmob_moment (st);
+ assert (this_shortest.to_bool ());
+ shortest_in_measure = min (shortest_in_measure, this_shortest.main_part_);
+ }
+ else if (!shortest_in_measure.is_infinity ()
+ && Paper_column::is_breakable (cols[i]))
{
- SCM st = cols[i]->get_grob_property ("shortest-starter-duration");
- Moment this_shortest = *unsmob_moment(st);
- shortest = shortest <? this_shortest;
- if (!mean_shortest.infty_b ())
+ vsize j = 0;
+ for (; j < durations.size (); j++)
{
- n++;
- mean_shortest += this_shortest;
+ if (durations[j] > shortest_in_measure)
+ {
+ counts.insert (counts.begin () + j, 1);
+ durations.insert (durations.begin () + j, shortest_in_measure);
+ break;
+ }
+ else if (durations[j] == shortest_in_measure)
+ {
+ counts[j]++;
+ break;
+ }
}
+
+ if (durations.size () == j)
+ {
+ durations.push_back (shortest_in_measure);
+ counts.push_back (1);
+ }
+
+ shortest_in_measure.set_infinite (1);
}
}
- mean_shortest /= n;
-
- for (int i= 0; i < cols.size () - 1; i++)
+ int max_idx = -1;
+ int max_count = 0;
+ for (vsize i = durations.size (); i--;)
{
- Item * l = dynamic_cast<Item*> (cols[i]);
- Item * r = dynamic_cast<Item*> (cols[i+1]);
- Item * lb = dynamic_cast<Item*> ( l->find_prebroken_piece (RIGHT));
- Item * rb = dynamic_cast<Item*> ( r->find_prebroken_piece (LEFT));
+ if (counts[i] >= max_count)
+ {
+ max_idx = i;
+ max_count = counts[i];
+ }
- Item* combinations[4][2]={{l,r}, {lb,r}, {l,rb},{lb,rb}};
+ // printf ("duration %d/%d, count %d\n",
+ // durations[i].num (), durations[i].den (), counts[i]);
+ }
+ SCM bsd = me->get_property ("base-shortest-duration");
+ Rational d = Rational (1, 8);
+ if (Moment *m = unsmob_moment (bsd))
+ d = m->main_part_;
- /*
- left refers to the space that is associated with items of the left column, so you have
+ if (max_idx >= 0)
+ d = min (d, durations[max_idx]);
- LC <- left_space -><- right_space -> RC
- <- total space ->
-
+ return d;
+}
- typically, right_space is non-zero when there are
- accidentals in RC
-
- */
- for (int j=0; j < 4; j++)
+void
+Spacing_spanner::generate_pair_spacing (Grob *me,
+ Paper_column *left_col, Paper_column *right_col,
+ Paper_column *after_right_col,
+ Spacing_options const *options)
+{
+ if (Paper_column::is_musical (left_col))
+ {
+ bool skip_unbroken_right = false;
+
+ if (!Paper_column::is_musical (right_col)
+ && options->float_nonmusical_columns_
+ && after_right_col
+ && Paper_column::is_musical (after_right_col))
+ skip_unbroken_right = true;
+
+ if (skip_unbroken_right)
{
- Paper_column * lc = dynamic_cast<Paper_column*> (combinations[j][0]);
- Paper_column *rc = dynamic_cast<Paper_column*> (combinations[j][1]);
- if (!lc || !rc)
- continue;
+ /*
+ TODO: should generate rods to prevent collisions.
+ */
+ musical_column_spacing (me, left_col, after_right_col, options);
+ right_col->set_object ("between-cols", scm_cons (left_col->self_scm (),
+ after_right_col->self_scm ()));
+ }
+ else
+ musical_column_spacing (me, left_col, right_col, options);
- Spring s;
- s.item_l_drul_[LEFT] = lc;
- s.item_l_drul_[RIGHT] = rc;
-
- SCM hint = lc->get_grob_property ("extra-space");
- SCM next_hint = rc->get_grob_property ("extra-space");
- SCM stretch_hint = lc->get_grob_property ("stretch-distance");
- SCM next_stretch_hint = rc->get_grob_property ("stretch-distance");
+ if (Item *rb = right_col->find_prebroken_piece (LEFT))
+ musical_column_spacing (me, left_col, rb, options);
+ }
+ else
+ {
+ /*
+ The case that the right part is broken as well is rather
+ rare, but it is possible, eg. with a single empty measure,
+ or if one staff finishes a tad earlier than the rest.
+ */
+ Item *lb = left_col->find_prebroken_piece (RIGHT);
+ Item *rb = right_col->find_prebroken_piece (LEFT);
- Real left_distance = 0;
- if (gh_pair_p (hint))
- {
- left_distance = gh_scm2double (gh_cdr (hint));
- }
- // 2nd condition should be (i+1 < col_count()), ie. not the last column in score. FIXME
- else if (!lc->musical_b() && i+1 < cols.size ())
- {
- left_distance= default_bar_spacing (me,lc,rc,shortest <? base_shortest_duration);
- }
- else if (lc->musical_b())
- {
- left_distance = note_spacing (me,lc, rc, shortest <? base_shortest_duration);
- }
- else
- programming_error ("uninitialised left_distance");
-
- s.distance_f_ = left_distance;
+ if (left_col && right_col)
+ breakable_column_spacing (me, left_col, right_col, options);
- /*
- Only do tight spaces *after* barlines (breakable columns),
- not before.
+ if (lb && right_col)
+ breakable_column_spacing (me, lb, right_col, options);
- We want the space before barline to be like the note
- spacing in the measure.
- */
- SCM sfac =lc->get_grob_property ("space-factor");
- if (gh_number_p (lc->get_grob_property ("column-space-strength"))
- && (Item::breakable_b (lc) || lc->original_l_))
- {
- s.strength_f_ =
- gh_scm2double (lc->get_grob_property ("column-space-strength"));
- }
- else if (gh_number_p (sfac))
- left_distance *= gh_scm2double (sfac);
+ if (left_col && rb)
+ breakable_column_spacing (me, left_col, rb, options);
-
- Real right_dist = 0.0;
- if (gh_pair_p (next_hint))
- {
- right_dist += - gh_scm2double (gh_car (next_hint));
- }
- else
- {
- Interval ext (rc->extent (rc, X_AXIS));
- right_dist = ext.empty_b() ? 0.0 : - ext [LEFT];
- }
+ if (lb && rb)
+ breakable_column_spacing (me, lb, rb, options);
+ }
+}
- /*
- don't want to create too much extra space for accidentals
- */
- if (rc->musical_b ())
- {
- if (to_boolean (rc->get_grob_property ("contains-grace")))
- right_dist *= gh_scm2double (rc->get_grob_property ("before-grace-spacing-factor")); // fixme.
- else
- right_dist *= gh_scm2double (lc->get_grob_property ("before-musical-spacing-factor"));
- }
-
- s.distance_f_ = left_distance + right_dist;
-
- Real stretch_dist = 0.;
- if (gh_number_p (stretch_hint))
- stretch_dist += gh_scm2double (stretch_hint);
- else
- stretch_dist += left_distance;
-
- if (gh_pair_p (next_stretch_hint))
- // see regtest spacing-tight
- stretch_dist += - gh_scm2double (gh_car (next_stretch_hint));
- else
- stretch_dist += right_dist;
+void
+Spacing_spanner::generate_springs (Grob *me,
+ vector<Grob*> const &cols,
+ Spacing_options const *options)
+{
+ Paper_column *prev = 0;
+ for (vsize i = 0; i < cols.size (); i++)
+ {
+ Paper_column *col = dynamic_cast<Paper_column *> (cols[i]);
+ Paper_column *next = (i < cols.size()-1) ? dynamic_cast<Paper_column *> (cols[i+1]) : 0;
+
+ if (i > 0)
+ generate_pair_spacing (me, prev, col, next, options);
- if (s.distance_f_ <0)
- {
- programming_error("Negative dist, setting to 1.0 PT");
- s.distance_f_ = 1.0;
- }
- if (stretch_dist == 0.0)
- {
- /*
- \bar "". We give it 0 space, with high strength.
- */
- s.strength_f_ = 20.0;
- }
- else
- s.strength_f_ /= stretch_dist;
-
- s.add_to_cols ();
- }
+ prev = col;
}
-
}
-/**
- Do something if breakable column has no spacing hints set.
- */
-Real
-Spacing_spanner::default_bar_spacing (Grob*me, Grob *lc, Grob *rc,
- Moment shortest)
+/*
+ Generate the space between two musical columns LEFT_COL and RIGHT_COL, given
+ spacing parameters INCR and SHORTEST.
+*/
+void
+Spacing_spanner::musical_column_spacing (Grob *me,
+ Item *left_col,
+ Item *right_col,
+ Spacing_options const *options)
{
- Real symbol_distance = lc->extent (lc,X_AXIS)[RIGHT] ;
- Real durational_distance = 0;
- Moment delta_t = Paper_column::when_mom (rc) - Paper_column::when_mom (lc);
+ bool expand_only = false;
+ Real base_note_space = note_spacing (me, left_col, right_col, options, &expand_only);
- /*
- ugh should use shortest_playing distance
- */
- if (delta_t)
+ Real max_fixed = 0;
+ Real max_space = 0;
+ Real compound_note_space = 0.0;
+ Real compound_fixed_note_space = 0.0;
+
+ if (options->stretch_uniformly_)
{
- durational_distance = get_duration_space (me, delta_t, shortest);
+ compound_note_space = base_note_space;
+
+ if (!Paper_column::is_musical (right_col))
+ {
+ /*
+ Crude fix for notes that lead up to barlines and time sigs.
+ */
+ Interval lext = right_col->extent (right_col, X_AXIS);
+ if (!lext.is_empty ())
+ compound_note_space += -lext[LEFT];
+ }
+
}
+ else
+ {
+ int wish_count = 0;
- return symbol_distance >? durational_distance;
-}
+ extract_grob_set (left_col, "right-neighbors", neighbors);
+ /*
+ We adjust the space following a note only if the next note
+ happens after the current note (this is set in the grob
+ property SPACING-SEQUENCE.
+ */
+ for (vsize i = 0; i < neighbors.size (); i++)
+ {
+ Grob *wish = neighbors[i];
-/**
- Get the measure wide ant for arithmetic spacing.
+ Item *wish_rcol = Note_spacing::right_column (wish);
+ if (Note_spacing::left_column (wish) != left_col
+ || (wish_rcol != right_col && wish_rcol != right_col->original ()))
+ continue;
- @see
- John S. Gourlay. ``Spacing a Line of Music,'' Technical Report
- OSU-CISRC-10/87-TR35, Department of Computer and Information Science,
- The Ohio State University, 1987.
+ /*
+ This is probably a waste of time in the case of polyphonic
+ music. */
+ if (Note_spacing::has_interface (wish))
+ {
+ Real space = 0.0;
+ Real fixed = 0.0;
- */
-Real
-Spacing_spanner::get_duration_space (Grob*me, Moment d, Moment shortest)
-{
- Real log = log_2 (shortest);
- Real k = gh_scm2double (me->get_grob_property ("arithmetic-basicspace"))
- - log;
-
- return (log_2 (d) + k) * gh_scm2double (me->get_grob_property ("arithmetic-multiplier"));
-}
+ Note_spacing::get_spacing (wish, right_col, base_note_space, options->increment_, &space, &fixed);
-Real
-Spacing_spanner::note_spacing (Grob*me, Grob *lc, Grob *rc,
- Moment shortest)
-{
- Moment shortest_playing_len = 0;
- SCM s = lc->get_grob_property ("shortest-playing-duration");
+ max_space = max (max_space, space);
+ max_fixed = max (max_fixed, fixed);
+
+ compound_note_space += space;
+ compound_fixed_note_space += fixed;
+ wish_count++;
+ }
+ }
- // SCM s = lc->get_grob_property ("mean-playing-duration");
- if (unsmob_moment (s))
- shortest_playing_len = *unsmob_moment(s);
-
- if (! shortest_playing_len)
+ if (Paper_column::when_mom (right_col).grace_part_
+ && !Paper_column::when_mom (left_col).grace_part_)
+ {
+ /*
+ Ugh. 0.8 is arbitrary.
+ */
+ compound_note_space *= 0.8;
+ }
+
+ if (compound_note_space < 0 || wish_count == 0)
+ {
+ /*
+ Fixed should be 0.0. If there are no spacing wishes, we're
+ likely dealing with polyphonic spacing of hemiolas.
+
+ We used to have compound_fixed_note_space = options->increment_
+
+ but this can lead to numeric instability problems when we
+ do
+
+ inverse_strength = (compound_note_space - compound_fixed_note_space)
+
+ */
+
+ compound_note_space = base_note_space;
+ compound_fixed_note_space = 0.0;
+ }
+ else if (to_boolean (me->get_property ("average-spacing-wishes")))
+ {
+ compound_note_space /= wish_count;
+ compound_fixed_note_space /= wish_count;
+ }
+ else
+ {
+ compound_fixed_note_space = max_fixed;
+ compound_note_space = max_space;
+ }
+
+ /*
+ Whatever we do, the fixed space is smaller than the real
+ space.
+
+ TODO: this criterion is discontinuous in the derivative.
+ Maybe it should be continuous?
+ */
+ compound_fixed_note_space = min (compound_fixed_note_space,
+ compound_note_space);
+ }
+
+ Real inverse_strength = 1.0;
+ Real distance = 1.0;
+
+ /*
+ TODO: make sure that the space doesn't exceed the right margin.
+ */
+ if (options->packed_)
{
- programming_error ("can't find a ruling note at " + Paper_column::when_mom (lc).str ());
- shortest_playing_len = 1;
+ /*
+ In packed mode, pack notes as tight as possible. This makes
+ sense mostly in combination with raggedright mode: the notes
+ are then printed at minimum distance. This is mostly useful
+ for ancient notation, but may also be useful for some flavours
+ of contemporary music. If not in raggedright mode, lily will
+ pack as much bars of music as possible into a line, but the
+ line will then be stretched to fill the whole linewidth.
+ */
+ inverse_strength = 1.0;
+ distance = compound_fixed_note_space;
}
-
- if (! shortest)
+ else
{
- programming_error ("no minimum in measure at " + Paper_column::when_mom (lc).str ());
- shortest = 1;
+ inverse_strength = (compound_note_space - compound_fixed_note_space);
+ distance = compound_note_space;
}
- Moment delta_t = Paper_column::when_mom (rc) - Paper_column::when_mom (lc);
- Real dist = get_duration_space (me, shortest_playing_len, shortest);
- dist *= (double)(delta_t / shortest_playing_len);
- /*
- UGH: KLUDGE!
- */
-
- if (delta_t > Moment (1,32))
- dist += stem_dir_correction (me, lc,rc);
- return dist;
+ Spaceable_grob::add_spring (left_col, right_col, distance, inverse_strength);
}
+/*
+ Read hints from L and generate springs.
+*/
+void
+Spacing_spanner::breakable_column_spacing (Grob *me, Item *l, Item *r,
+ Spacing_options const *options)
+{
+ Real compound_fixed = 0.0;
+ Real compound_space = 0.0;
+ Real max_fixed = 0.0;
+ Real max_space = 0.0;
+
+ int wish_count = 0;
-/**
- Correct for optical illusions. See [Wanske] p. 138. The combination
- up-stem + down-stem should get extra space, the combination
- down-stem + up-stem less.
+ Moment dt = Paper_column::when_mom (r) - Paper_column::when_mom (l);
- This should be more advanced, since relative heights of the note
- heads also influence required correction.
+ if (dt == Moment (0, 0))
+ {
+ extract_grob_set (l, "spacing-wishes", wishes);
- Also might not work correctly in case of multi voices or staff
- changing voices
+ for (vsize i = 0; i < wishes.size (); i++)
+ {
+ Item *spacing_grob = dynamic_cast<Item *> (wishes[i]);
- TODO: lookup correction distances? More advanced correction?
- Possibly turn this off?
+ if (!spacing_grob || !Staff_spacing::has_interface (spacing_grob))
+ continue;
- TODO: have to check wether the stems are in the same staff.
+ Real space;
+ Real fixed_space;
- This routine reads the DIR-LIST property of both its L and R arguments. */
-Real
-Spacing_spanner::stem_dir_correction (Grob*me, Grob*l, Grob*r)
-{
- SCM dl = l->get_grob_property ("dir-list");
- SCM dr = r->get_grob_property ("dir-list");
-
- if (scm_ilength (dl) != 1 || scm_ilength (dr) != 1)
- return 0.;
+ /*
+ column for the left one settings should be ok due automatic
+ pointer munging.
- dl = gh_car (dl);
- dr = gh_car (dr);
+ */
+ assert (spacing_grob->get_column () == l);
- assert (gh_number_p (dl) && gh_number_p(dr));
- int d1 = gh_scm2int (dl);
- int d2 = gh_scm2int (dr);
+ Staff_spacing::get_spacing_params (spacing_grob,
+ &space, &fixed_space);
- if (d1 == d2)
- return 0.0;
+ if (Paper_column::when_mom (r).grace_part_)
+ {
+ /*
+ Correct for grace notes.
+ Ugh. The 0.8 is arbitrary.
+ */
+ space *= 0.8;
+ }
- Real correction = 0.0;
- Real ssc = gh_scm2double (me->get_grob_property("stem-spacing-correction"));
+ max_space = max (max_space, space);
+ max_fixed = max (max_fixed, fixed_space);
+
+ compound_space += space;
+ compound_fixed += fixed_space;
+ wish_count++;
+ }
+ }
- if (d1 && d2 && d1 * d2 == -1)
+ if (compound_space <= 0.0 || !wish_count)
{
- correction = d1 * ssc;
+ standard_breakable_column_spacing (me, l, r, &compound_fixed, &compound_space,
+ options);
+ wish_count = 1;
}
else
- programming_error ("Stem directions not set correctly for optical correction");
- return correction;
-}
-
-
-MAKE_SCHEME_CALLBACK(Spacing_spanner, set_springs,1);
-SCM
-Spacing_spanner::set_springs (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
- Link_array<Grob> all (me->pscore_l_->line_l_->column_l_arr ()) ;
-
- int j = 0;
-
- for (int i = 1; i < all.size (); i++)
{
- Grob *sc = all[i];
- if (Item::breakable_b (sc))
- {
- Link_array<Grob> measure (all.slice (j, i+1));
- do_measure (me, measure);
- j = i;
- }
+ if (to_boolean (me->get_property ("average-spacing-wishes")))
+ {
+ compound_space /= wish_count;
+ compound_fixed /= wish_count;
+ }
+ else
+ {
+ compound_fixed = max_fixed;
+ compound_space = max_space;
+ }
+
}
+ if (options->stretch_uniformly_ && l->break_status_dir () != RIGHT)
+ compound_fixed = 0.0;
+
+ assert (!isinf (compound_space));
+ compound_space = max (compound_space, compound_fixed);
+
/*
- farewell, cruel world
- */
- me->suicide ();
- return SCM_UNSPECIFIED;
-}
+ There used to be code that changed spacing depending on
+ raggedright setting. Ugh.
+
+ Do it more cleanly, or rename the property.
+ */
+ Real inverse_strength = (compound_space - compound_fixed);
+ Real distance = compound_space;
+ Spaceable_grob::add_spring (l, r, distance, inverse_strength);
+}
+ADD_INTERFACE (Spacing_spanner, "spacing-spanner-interface",
+ "The space taken by a note is dependent on its duration. Doubling a\n"
+ "duration adds spacing-increment to the space. The most common shortest\n"
+ "note gets @code{shortest-duration-space}. Notes that are even shorter are\n"
+ "spaced proportonial to their duration.\n"
+ "\n"
+ "Typically, the increment is the width of a black note head. In a\n"
+ "piece with lots of 8th notes, and some 16th notes, the eighth note\n"
+ "gets 2 note heads width (i.e. the space following a note is 1 note\n"
+ "head width) A 16th note is followed by 0.5 note head width. The\n"
+ "quarter note is followed by 3 NHW, the half by 4 NHW, etc.\n",
+
+
+ "average-spacing-wishes "
+ "base-shortest-duration "
+ "common-shortest-duration "
+ "grace-space-factor "
+ "packed-spacing "
+ "shortest-duration-space "
+ "spacing-increment "
+ "strict-note-spacing "
+ "uniform-stretching "
+
+ );
+
+ADD_INTERFACE (Spacing_interface, "spacing-interface",
+ "Something to do with line breaking and spacing. "
+ "Kill this one after determining line breaks.",
+ "");
-/*
- maximum-duration-for-spacing
-From: bf250@freenet.carleton.ca (John Sankey)
-To: gnu-music-discuss@gnu.org
-Subject: note spacing suggestion
-Date: Mon, 10 Jul 2000 11:28:03 -0400 (EDT)
-
-Currently, Lily spaces notes by starting with a basic distance,
-arithmetic_multiplier, which it applies to the minimum duration note
-of the bar. Then she adds a logarithmic increment, scaled from
-arithmetic_basicspace, for longer notes. (Then, columns are aligned
-and justified.) Fundamentally, this matches visual spacing to musical
-weight and works well.
-
-A lot of the time in music, I see a section basically in melodic
-notes that occasionally has a rapid ornamental run (scale). So, there
-will be a section in 1/4 notes, then a brief passage in 1/32nds, then
-a return to long notes. Currently, Lily gives the same horizontal
-space to the 1/32nd notes in their bar (even if set in small size as
-is commonly done for cadenzii) as she gives to 1/4 notes in bars
-where 1/4 note is the minimum duration. The resulting visual weight
-does not match the musical weight over the page.
-
-Looking at the music I am typesetting, I feel that Lily's spacing
-could be significantly improved if, with no change in the basic
-method used, arithmetic_multiplier could be applied referred to the
-same duration throughout a piece. Of course, the current method
-should be retained for those who have already set music in it, so I
-suggest a property called something like arithmetic_base=16 to fix
-1/16 duration as the reference for arithmetic_multiplier; the default
-would be a dynamic base is it is now.
-
-Does anyone else feel that this would be a useful improvement for
-their music? (Of course, if arithmetic_multiplier became a regular
-property, this could be used to achieve a similar result by
-tweaking.)
-
- */
projects / lilypond.git / blobdiff