X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fspacing-spanner.cc;h=e1d454816b895ddbb4290ec69b66f671912b1919;hb=a90b4f6c28f125d797df443241501a679c900424;hp=c477bd17c28e4fee26ad1110cf2651bed5705593;hpb=867530093ed5374d6e28d2c11a933f3b991c226e;p=lilypond.git diff --git a/lily/spacing-spanner.cc b/lily/spacing-spanner.cc index c477bd17c2..e1d454816b 100644 --- a/lily/spacing-spanner.cc +++ b/lily/spacing-spanner.cc @@ -1,392 +1,580 @@ -/* - spacing-spanner.cc -- implement Spacing_spanner - - source file of the GNU LilyPond music typesetter - - (c) 1999--2000 Han-Wen Nienhuys - - */ +/* + This file is part of LilyPond, the GNU music typesetter. + + Copyright (C) 1999--2010 Han-Wen Nienhuys + + LilyPond is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + LilyPond is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with LilyPond. If not, see . +*/ #include "spacing-spanner.hh" + +#include +#include + +#include "spacing-options.hh" +#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 "separation-item.hh" +#include "skyline-pair.hh" +#include "spaceable-grob.hh" +#include "spacing-interface.hh" +#include "staff-spacing.hh" +#include "system.hh" +#include "warn.hh" -void -Spacing_spanner::set_interface (Score_element*me) +vector +Spacing_spanner::get_columns (Grob *me_grob) { - me->set_extent_callback (SCM_EOL, X_AXIS); - me->set_extent_callback (SCM_EOL, Y_AXIS) ; + Spanner *me = dynamic_cast (me_grob); + vector all (get_root_system (me)->used_columns ()); + vsize start = binary_search (all, (Grob*)me->get_bound (LEFT), + &Paper_column::less_than); + vsize end = binary_search (all, (Grob*) me->get_bound (RIGHT), + &Paper_column::less_than); + + all = vector (all.begin () + start, + all.begin () + end + 1); + return all; } -/* +MAKE_SCHEME_CALLBACK (Spacing_spanner, set_springs, 1); +SCM +Spacing_spanner::set_springs (SCM smob) +{ + Spanner *me = unsmob_spanner (smob); - The algorithm is partly taken from : + /* + can't use get_system () ? --hwn. + */ + Spacing_options options; + options.init_from_grob (me); + vector cols = Spacing_spanner::get_columns (me); + set_explicit_neighbor_columns (cols); - 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. + prune_loose_columns (me, &cols, &options); + set_implicit_neighbor_columns (cols); + generate_springs (me, cols, &options); - TOO HAIRY. + return SCM_UNSPECIFIED; +} - TODO: write comments - - */ -void -Spacing_spanner::do_measure (Score_element*me, Link_array cols) +/* + 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. +*/ + +MAKE_SCHEME_CALLBACK (Spacing_spanner, calc_common_shortest_duration, 1); +SCM +Spacing_spanner::calc_common_shortest_duration (SCM grob) { - Moment shortest; - Moment mean_shortest; + Spanner *me = unsmob_spanner (grob); + vector cols (get_columns (me)); + /* - space as if this duration is present. - */ - Moment base_shortest_duration = *unsmob_moment (me->get_elt_property ("maximum-duration-for-spacing")); - shortest.set_infinite (1); + ascending in duration + */ + vector durations; + vector counts; + + Rational shortest_in_measure; + shortest_in_measure.set_infinite (1); - int n = 0; - for (int i =0 ; i < cols.size (); i++) + for (vsize i = 0; i < cols.size (); i++) { - if (dynamic_cast (cols[i])->musical_b ()) + if (Paper_column::is_musical (cols[i])) { - SCM st = cols[i]->get_elt_property ("shortest-starter-duration"); - Moment this_shortest = *unsmob_moment(st); - shortest = shortest 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])) + { + vsize j = 0; + for (; j < durations.size (); j++) + { + 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) { - n++; - mean_shortest += this_shortest; + 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++) + vsize max_idx = VPOS; + int max_count = 0; + for (vsize i = durations.size (); i--;) { - Item * l = dynamic_cast (cols[i]); - Item * r = dynamic_cast (cols[i+1]); - Item * lb = dynamic_cast ( l->find_prebroken_piece (RIGHT)); - Item * rb = dynamic_cast ( 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}}; + SCM bsd = me->get_property ("base-shortest-duration"); + Rational d = Rational (1, 8); + if (Moment *m = unsmob_moment (bsd)) + d = m->main_part_; + if (max_idx != VPOS) + d = min (d, durations[max_idx]); + return Moment (d).smobbed_copy (); +} + +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)) + { + if (!Paper_column::is_musical (right_col) + && (options->float_nonmusical_columns_ || to_boolean (right_col->get_property ("maybe-loose"))) + && after_right_col + && Paper_column::is_musical (after_right_col)) + { + /* + 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); + + if (Item *rb = right_col->find_prebroken_piece (LEFT)) + musical_column_spacing (me, left_col, rb, options); + } + else + { /* - left refers to the space that is associated with items of the left column, so you have + 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); + + if (left_col && right_col) + breakable_column_spacing (me, left_col, right_col, options); + + if (lb && right_col) + breakable_column_spacing (me, lb, right_col, options); + + if (left_col && rb) + breakable_column_spacing (me, left_col, rb, options); + + if (lb && rb) + breakable_column_spacing (me, lb, rb, options); + } +} + +static void +set_column_rods (vector const &cols, Real padding) +{ + /* distances[i] will be the minimum distance between column i and column i+1 */ + vector distances; + + for (vsize i = 1; i < cols.size (); i++) + { + assert (distances.size () == i-1); - LC <- left_space -><- right_space -> RC - <- total space -> - + Item *r = dynamic_cast (cols[i]); + Item *rb = r->find_prebroken_piece (LEFT); - typically, right_space is non-zero when there are - accidentals in RC - - */ - for (int j=0; j < 4; j++) + if (Separation_item::is_empty (r) && (!rb || Separation_item::is_empty (rb))) { - Paper_column * lc = dynamic_cast (combinations[j][0]); - Paper_column *rc = dynamic_cast (combinations[j][1]); - if (!lc || !rc) - continue; + distances.push_back (0); + continue; + } - Spring s; - s.item_l_drul_[LEFT] = lc; - s.item_l_drul_[RIGHT] = rc; - - SCM hint = lc->get_elt_property ("extra-space"); - SCM next_hint = rc->get_elt_property ("extra-space"); - SCM stretch_hint = lc->get_elt_property ("stretch-distance"); - SCM next_stretch_hint = rc->get_elt_property ("stretch-distance"); - - Real left_distance; - 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 musical_b()) - { - left_distance = note_spacing (me,lc, rc, shortest get_property ("horizontal-skylines")); + Real right_stickout = skys ? (*skys)[LEFT].max_height () : 0.0; - s.distance_f_ = left_distance; + /* min rather than max because right-stickout will be negative if the right-hand column + sticks out a lot to the left */ + right_stickout = min (right_stickout, + Separation_item::conditional_skyline (r, cols[i-1]).max_height ()); - /* - Only do tight spaces *after* barlines (breakable columns), - not before. + Drul_array r_cols (r, rb); + Drul_array cur_dist (0.0, 0.0); - We want the space before barline to be like the note - spacing in the measure. - */ - SCM sfac =lc->get_elt_property ("space-factor"); - if (Item::breakable_b (lc) || lc->original_l_) + /* This is an inner loop and hence it is potentially quadratic. However, we only continue + as long as there is a rod to insert. Therefore, this loop will usually only execute + a constant number of times per iteration of the outer loop. */ + for (vsize j = i; j--;) + { + Item *l = dynamic_cast (cols[j]); + Item *lb = l->find_prebroken_piece (RIGHT); + Skyline_pair *skys = Skyline_pair::unsmob (l->get_property ("horizontal-skylines")); + Real left_stickout = skys ? (*skys)[RIGHT].max_height () : 0.0; + bool done = true; + + Direction d = LEFT; + do { - s.strength_f_ = - gh_scm2double (lc->get_elt_property ("column-space-strength")); + if (j < i-1) + cur_dist[d] += distances[j]; + + Item *r_col = r_cols[d]; + bool touches = right_stickout - left_stickout + cur_dist[d] < 0.0; + Real dist = 0.0; + + /* we set a distance for the line-starter column even if its non-broken counterpart + doesn't touch the right column. */ + if (lb) + Separation_item::set_distance (lb, r_col, padding); + + if (touches || j == i-1) + dist = Separation_item::set_distance (l, r_col, padding); + + if (j == i-1 && d == LEFT) + distances.push_back (dist); + + if (j == i-1) + cur_dist[d] = distances[j]; + + cur_dist[d] = max (cur_dist[d], dist); + done = done && !touches; } - else if (gh_number_p (sfac)) - left_distance *= gh_scm2double (sfac); + while (flip (&d) != LEFT && rb); + + /* we need the empty check for gregorian notation, where there are a lot of + extraneous paper-columns that we need to skip over */ + if (done && !Separation_item::is_empty (l)) + break; + } + } +} + - - Real right_dist = 0.0; - if (gh_pair_p (next_hint)) +void +Spacing_spanner::generate_springs (Grob *me, + vector const &cols, + Spacing_options const *options) +{ + Paper_column *prev = dynamic_cast (cols[0]); + for (vsize i = 1; i < cols.size (); i++) + { + Paper_column *col = dynamic_cast (cols[i]); + Paper_column *next = (i + 1 < cols.size ()) ? dynamic_cast (cols[i+1]) : 0; + + generate_pair_spacing (me, prev, col, next, options); + + prev = col; + } + + Real padding = robust_scm2double (prev->get_property ("padding"), 0.1); + set_column_rods (cols, padding); +} + +/* + Generate the space between two musical columns LEFT_COL and RIGHT_COL. +*/ +void +Spacing_spanner::musical_column_spacing (Grob *me, + Item *left_col, + Item *right_col, + Spacing_options const *options) +{ + Real base_note_space = note_spacing (me, left_col, right_col, options); + Spring spring; + + if (options->stretch_uniformly_) + spring = Spring (base_note_space, 0.0); + else + { + vector springs; + extract_grob_set (left_col, "spacing-wishes", wishes); + + for (vsize i = 0; i < wishes.size (); i++) + { + Grob *wish = wishes[i]; + if (Spacing_interface::left_column (wish) != left_col) { - right_dist += - gh_scm2double (gh_car (next_hint)); + /* This shouldn't really happen, but the ancient music + stuff really messes up the spacing code, grrr + */ + continue; } - else + + extract_grob_set (wish, "right-items", right_items); + bool found_matching_column = false; + for (vsize j = 0; j < right_items.size (); j++) { - Interval ext (rc->extent (rc, X_AXIS)); - right_dist = ext.empty_b() ? 0.0 : - ext [LEFT]; + Item *it = dynamic_cast (right_items[j]); + if (it && (right_col == it->get_column () + || right_col->original () == it->get_column ())) + found_matching_column = true; } /* - don't want to create too much extra space for accidentals - */ - if (rc->musical_b ()) - { - if (to_boolean (rc->get_elt_property ("contains-grace"))) - right_dist *= gh_scm2double (rc->get_elt_property ("before-grace-spacing-factor")); // fixme. - else - right_dist *= gh_scm2double (lc->get_elt_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; - - if (s.distance_f_ <0) + This is probably a waste of time in the case of polyphonic + music. */ + if (found_matching_column && Note_spacing::has_interface (wish)) { - programming_error("Negative dist, setting to 1.0 PT"); - s.distance_f_ = 1.0; + Real inc = options->increment_; + Grob *gsp = unsmob_grob (left_col->get_object ("grace-spacing")); + if (gsp && Paper_column::when_mom (left_col).grace_part_) + { + Spacing_options grace_opts; + grace_opts.init_from_grob (gsp); + inc = grace_opts.increment_; + } + springs.push_back (Note_spacing::get_spacing (wish, right_col, base_note_space, inc)); } - if (stretch_dist == 0.0) + } + + if (springs.empty ()) + { + + if (!Paper_column::is_musical (right_col)) { /* - \bar "". We give it 0 space, with high strength. + There used to be code that examined left_col->extent + (X_AXIS), but this is resulted in unexpected wide + spacing, because the width of s^"text" output is also + taken into account here. */ - s.strength_f_ = 20.0; + spring = Spring (max (base_note_space, options->increment_), + options->increment_); } else - s.strength_f_ /= stretch_dist; - - s.add_to_cols (); + { + /* + Min distance should be 0.0. If there are no spacing + wishes, we're probably dealing with polyphonic spacing + of hemiolas. + */ + spring = Spring (base_note_space, 0.0); + } } + else + spring = merge_springs (springs); } - -} -/** - Do something if breakable column has no spacing hints set. - */ -Real -Spacing_spanner::default_bar_spacing (Score_element*me, Score_element *lc, Score_element *rc, - Moment shortest) -{ - 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); + if (Paper_column::when_mom (right_col).grace_part_ + && !Paper_column::when_mom (left_col).grace_part_) + { + /* + Ugh. 0.8 is arbitrary. + */ + spring *= 0.8; + } /* - ugh should use shortest_playing distance + TODO: make sure that the space doesn't exceed the right margin. */ - if (delta_t) + if (options->packed_) { - durational_distance = get_duration_space (me, delta_t, shortest); + /* + In packed mode, pack notes as tight as possible. This makes + sense mostly in combination with ragged-right 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 ragged-right mode, lily will + pack as many bars of music as possible into a line, but the + line will then be stretched to fill the whole linewidth. + + Note that we don't actually pack things as tightly as possible: + we don't allow the next column to begin before this one ends. + */ + /* FIXME: the else clause below is the "right" thing to do, + but we can't do it because of all the empty columns that the + ligature-engravers leave lying around. In that case, the extent of + the column is incorrect because it includes note-heads that aren't + there. We get around this by only including the column extent if + the left-hand column is "genuine". This is a dirty hack and it + should be fixed in the ligature-engravers. --jneem + */ + if (Paper_column::is_extraneous_column_from_ligature (left_col)) + spring.set_distance (spring.min_distance ()); + else + spring.set_distance (max (left_col->extent (left_col, X_AXIS)[RIGHT], + spring.min_distance ())); + + spring.set_inverse_stretch_strength (1.0); } - return symbol_distance >? durational_distance; + Spaceable_grob::add_spring (left_col, right_col, spring); } - -/** - Get the measure wide ant for arithmetic spacing. - - @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. - - */ -Real -Spacing_spanner::get_duration_space (Score_element*me, Moment d, Moment shortest) +/* + Check if COL fills the whole measure. + */ +bool +Spacing_spanner::fills_measure (Grob *me, Item *left, Item *col) { - Real log = log_2 (shortest); - Real k = gh_scm2double (me->get_elt_property ("arithmetic-basicspace")) - - log; + System *sys = get_root_system (me); + Item *next = sys->column (col->get_column ()->get_rank () + 1); + if (!next) + return false; + + if (Paper_column::is_musical (next) + || Paper_column::is_musical (left) + || !Paper_column::is_musical (col) + || !Paper_column::is_used (next)) + return false; - return (log_2 (d) + k) * gh_scm2double (me->get_elt_property ("arithmetic-multiplier")); -} - - -Real -Spacing_spanner::note_spacing (Score_element*me, Score_element *lc, Score_element *rc, - Moment shortest) -{ - Moment shortest_playing_len = 0; - SCM s = lc->get_elt_property ("shortest-playing-duration"); - - // SCM s = lc->get_elt_property ("mean-playing-duration"); - if (unsmob_moment (s)) - shortest_playing_len = *unsmob_moment(s); + Moment dt = + Paper_column::when_mom (next) - Paper_column::when_mom (col); - if (! shortest_playing_len) - { - programming_error ("can't find a ruling note at " + Paper_column::when_mom (lc).str ()); - shortest_playing_len = 1; - } + Moment *len = unsmob_moment (left->get_property ("measure-length")); + if (!len) + return false; - if (! shortest) - { - programming_error ("no minimum in measure at " + Paper_column::when_mom (lc).str ()); - shortest = 1; - } - 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; -} - - -/** - 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. + Don't check for exact measure length, since ending measures are + often shortened due to pickups. + */ + if (dt.main_part_ > len->main_part_ / Rational (2) + && (next->is_broken () + || next->break_status_dir ())) + return true; - This should be more advanced, since relative heights of the note - heads also influence required correction. + return false; +} - Also might not work correctly in case of multi voices or staff - changing voices +/* + Read hints from L and generate springs. +*/ +void +Spacing_spanner::breakable_column_spacing (Grob *me, Item *l, Item *r, + Spacing_options const *options) +{ + vector springs; + Spring spring; - TODO: lookup correction distances? More advanced correction? - Possibly turn this off? + Moment dt = Paper_column::when_mom (r) - Paper_column::when_mom (l); - TODO: have to check wether the stems are in the same staff. + if (dt == Moment (0, 0)) + { + extract_grob_set (l, "spacing-wishes", wishes); - This routine reads the DIR-LIST property of both its L and R arguments. */ -Real -Spacing_spanner::stem_dir_correction (Score_element*me, Score_element*l, Score_element*r) -{ - SCM dl = l->get_elt_property ("dir-list"); - SCM dr = r->get_elt_property ("dir-list"); - - if (scm_ilength (dl) != 1 || scm_ilength (dr) != 1) - return 0.; + for (vsize i = 0; i < wishes.size (); i++) + { + Item *spacing_grob = dynamic_cast (wishes[i]); - dl = gh_car (dl); - dr = gh_car (dr); + if (!spacing_grob || !Staff_spacing::has_interface (spacing_grob)) + continue; - assert (gh_number_p (dl) && gh_number_p(dr)); - int d1 = gh_scm2int (dl); - int d2 = gh_scm2int (dr); + /* + column for the left one settings should be ok due automatic + pointer munging. + */ + assert (spacing_grob->get_column () == l); - if (d1 == d2) - return 0.0; + springs.push_back (Staff_spacing::get_spacing (spacing_grob, r)); + } + } + if (springs.empty ()) + spring = standard_breakable_column_spacing (me, l, r, options); + else + spring = merge_springs (springs); - Real correction = 0.0; - Real ssc = gh_scm2double (me->get_elt_property("stem-spacing-correction")); + if (Paper_column::when_mom (r).grace_part_) + { + /* + Correct for grace notes. + + Ugh. The 0.8 is arbitrary. + */ + spring *= 0.8; + } - if (d1 && d2 && d1 * d2 == -1) + if (Paper_column::is_musical (r) + && l->break_status_dir () == CENTER + && fills_measure (me, l, r)) { - correction = d1 * ssc; + Real full_measure_extra_space = robust_scm2double (l->get_property ("full-measure-extra-space"), 1.0); + spring.set_distance (spring.distance () + full_measure_extra_space); + spring.set_default_compress_strength (); } - 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) -{ - Score_element *me = unsmob_element (smob); - Link_array all (me->pscore_l_->line_l_->column_l_arr ()) ; - - int j = 0; - - for (int i = 1; i < all.size (); i++) + if (options->stretch_uniformly_ && l->break_status_dir () != RIGHT) { - Score_element *sc = all[i]; - if (Item::breakable_b (sc)) - { - Link_array measure (all.slice (j, i+1)); - do_measure (me, measure); - j = i; - } + spring.set_min_distance (0.0); + spring.set_default_strength (); } - /* - farewell, cruel world - */ - me->suicide (); - return SCM_UNSPECIFIED; + Spaceable_grob::add_spring (l, r, spring); } +ADD_INTERFACE (Spacing_spanner, + "The space taken by a note is dependent on its duration." + " Doubling a duration adds @code{spacing-increment} to the" + " space. The most common shortest note gets" + " @code{shortest-duration-space}. Notes that are even shorter" + " are spaced proportonial to their duration.\n" + "\n" + "Typically, the increment is the width of a black note head." + " In a piece with lots of 8th notes, and some 16th notes, the" + " eighth note gets a 2@tie{}note heads width (i.e., the space" + " following a note is a 1@tie{}note head width). A 16th note" + " is followed by 0.5 note head width. The quarter note is" + " followed by 3@tie{}NHW, the half by 4@tie{}NHW, etc.", + + /* properties */ + "average-spacing-wishes " + "base-shortest-duration " + "common-shortest-duration " + "packed-spacing " + "shortest-duration-space " + "spacing-increment " + "strict-grace-spacing " + "strict-note-spacing " + "uniform-stretching " + ); - -/* - 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.) - - */