X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fsimple-spacer.cc;h=c7d016b27c2dfb894e75cb752b9f73a973977723;hb=38189e6a227753ee6dca31aac448d97071a8551d;hp=47eff23a031ed7d91a4b6f29b2ae0387e3285687;hpb=998986bbd15afaafb24904a777e8be9ba1233799;p=lilypond.git diff --git a/lily/simple-spacer.cc b/lily/simple-spacer.cc index 47eff23a03..c7d016b27c 100644 --- a/lily/simple-spacer.cc +++ b/lily/simple-spacer.cc @@ -1,60 +1,130 @@ -/* +/* simple-spacer.cc -- implement Simple_spacer - + source file of the GNU LilyPond music typesetter - - (c) 1999 Han-Wen Nienhuys + + (c) 1999--2005 Han-Wen Nienhuys TODO: - add support for different stretch/shrink constants? - - Use force as a minimizing function, and use it to discourage mixes of - wide and tight lines. - */ +#include +#include +#include "libc-extension.hh" // isinf #include "simple-spacer.hh" #include "paper-column.hh" #include "spring.hh" -#include "rod.hh" #include "warn.hh" #include "column-x-positions.hh" +#include "spaceable-grob.hh" +#include "dimensions.hh" + +/* + A simple spacing constraint solver. The approach: + + Stretch the line uniformly until none of the constraints (rods) + block. It then is very wide. + + Compress until the next constraint blocks, + + Mark the springs over the constrained part to be non-active. + + Repeat with the smaller set of non-active constraints, until all + constraints blocked, or until the line is as short as desired. + + This is much simpler, and much much faster than full scale + Constrained QP. On the other hand, a situation like this will not + be typeset as dense as possible, because + + c4 c4 c4 c4 + veryveryverylongsyllable2 veryveryverylongsyllable2 + " "4 veryveryverylongsyllable2 syllable4 + + + can be further compressed to + + + c4 c4 c4 c4 + veryveryverylongsyllable2 veryveryverylongsyllable2 + " "4 veryveryverylongsyllable2 syllable4 + + + Perhaps this is not a bad thing, because the 1st looks better anyway. */ + +/* + positive force = expanding, negative force = compressing. +*/ Simple_spacer::Simple_spacer () { - force_f_ = 0.; + /* + Give an extra penalty for compression. Needed to avoid compressing + tightly spaced lines. + */ + active_count_ = 0; + force_ = 0.; + indent_ = 0.0; + default_space_ = 20 PT; } void Simple_spacer::add_rod (int l, int r, Real dist) { - Real c = range_stiffness (l,r); - Real d = range_ideal_len (l,r); + if (isinf (dist) || isnan (dist)) + { + programming_error ("ignoring weird minimum distance"); + return; + } + + Real c = range_stiffness (l, r); + if (isinf (c)) + { + /* + If a spring is fixed, we have to do something here: + we let the rod override the spring. + */ + Real total_dist = 0.; + for (int i = l; i < r; i++) + total_dist += springs_[i].ideal_; + + if (total_dist < dist) + for (int i = l; i < r; i++) + springs_[i].ideal_ *= dist / total_dist; + + return; + } + + Real d = range_ideal_len (l, r); Real block_stretch = dist - d; - + Real block_force = c * block_stretch; - force_f_ = force_f_ >? block_force; - - for (int i=l; i < r; i++) - springs_[i].block_force_f_ = block_force >? - springs_[i].block_force_f_ ; + force_ = force_ >? block_force; + + for (int i = l; i < r; i++) + springs_[i].block_force_ = block_force >? + springs_[i].block_force_; } Real -Simple_spacer::range_ideal_len (int l, int r) const +Simple_spacer::range_ideal_len (int l, int r) const { - Real d =0.; - for (int i=l; i < r; i++) - d += springs_[i].ideal_f_; + Real d = 0.; + for (int i = l; i < r; i++) + d += springs_[i].ideal_; return d; } Real Simple_spacer::range_stiffness (int l, int r) const { - Real den =0.0; - for (int i=l; i < r; i++) - den += 1 / springs_[i].hooke_f_; + Real den = 0.0; + for (int i = l; i < r; i++) + { + if (springs_[i].is_active_) + den += 1 / springs_[i].hooke_; + } return 1 / den; } @@ -62,11 +132,11 @@ Simple_spacer::range_stiffness (int l, int r) const Real Simple_spacer::active_blocking_force () const { - Real bf = - infinity_f; - for (int i=0; i < springs_.size (); i++) - if (springs_[i].active_b_) + Real bf = -infinity_f; + for (int i = 0; i < springs_.size (); i++) + if (springs_[i].is_active_) { - bf = bf >? springs_[i].block_force_f_; + bf = bf >? springs_[i].block_force_; } return bf; } @@ -74,63 +144,70 @@ Simple_spacer::active_blocking_force () const Real Simple_spacer::active_springs_stiffness () const { - Real den = 0.0; - for (int i=0; i < springs_.size (); i++) - if (springs_[i].active_b_) - { - den += 1 / springs_[i].hooke_f_; - } - return 1/den; + Real stiff = range_stiffness (0, springs_.size ()); + if (isinf (stiff)) + { + /* + all springs are inactive. Take the stiffness of the + latest spring to block. + */ + + Real max_block_force = -infinity_f; + int max_i = -1; + for (int i = 0; i < springs_.size (); i++) + { + if (springs_[i].block_force_ > max_block_force) + { + max_i = i; + max_block_force = springs_[i].block_force_; + } + } + + stiff = springs_[max_i].hooke_; + } + return stiff; } void Simple_spacer::set_active_states () { - // safe, since - // force is only copied. - for (int i=0 ; i = force_f_) - springs_[i].active_b_ = false; -} + /* float comparison is safe, since force is only copied. */ + for (int i = 0; i < springs_.size (); i++) + if (springs_[i].is_active_ + && springs_[i].block_force_ >= force_) + { + springs_[i].is_active_ = false; + active_count_--; + } +} Real Simple_spacer::configuration_length () const { - Real l =0.; - for (int i=0; i < springs_.size (); i++) - l += springs_[i].length (force_f_); + Real l = 0.; + for (int i = 0; i < springs_.size (); i++) + l += springs_[i].length (force_); return l; } -Real -Spring_description::length (Real f) const -{ - if (!active_b_) - f = block_force_f_; - return ideal_f_ + f / hooke_f_ ; -} - bool -Simple_spacer::active_b () const +Simple_spacer::is_active () const { - for (int i=0; i < springs_.size (); i++) - if (springs_[i].active_b_) - return true; - return false; + return active_count_; } void Simple_spacer::my_solve_linelen () { - while (active_b ()) + while (is_active ()) { - force_f_ = active_blocking_force (); + force_ = active_blocking_force (); Real conf = configuration_length (); - if (conf < line_len_f_) + if (conf < line_len_) { - force_f_ += (line_len_f_ - conf) * active_springs_stiffness (); + force_ += (line_len_ - conf) * active_springs_stiffness (); break; } else @@ -138,121 +215,244 @@ Simple_spacer::my_solve_linelen () } } - void Simple_spacer::my_solve_natural_len () { - while (active_b ()) + Real line_len_force = 0.0; + + while (is_active ()) { - force_f_ = active_blocking_force () >? 0.0; + force_ = active_blocking_force () >? 0.0; + Real conf = configuration_length (); + + if (conf < line_len_) + { + line_len_force = force_ + + (line_len_ - conf) + * active_springs_stiffness (); + } - if (force_f_ < 1e-8) // ugh., + if (force_ < 1e-8) // ugh., break; - + set_active_states (); } + + force_ = line_len_force; } +/****************************************************************/ + +Spring_description::Spring_description () +{ + ideal_ = 0.0; + hooke_ = 0.0; + is_active_ = true; + block_force_ = 0.0; +} + +bool +Spring_description::is_sane () const +{ + return (hooke_ > 0) + && ideal_ > 0 + && !isinf (ideal_) && !isnan (ideal_); +} + +Real +Spring_description::length (Real f) const +{ + if (!is_active_) + f = block_force_; + return ideal_ + f / hooke_; +} +/****************************************************************/ + +/* + TODO: should a add penalty for widely varying spring forces (caused + by constraints, eg. + + + ===== + | | + o|o| x ##x + + + The ## forces the notes apart; we shouldn't allow the O's to touch + this closely. +*/ void -Simple_spacer::add_columns (Link_array cols) +Simple_spacer_wrapper::solve (Column_x_positions *positions, bool ragged) { - for (int i=0; i < cols.size () - 1; i++) - { - Paper_column * c = cols [i]; - Column_spring *to_next = 0; - for (int j =0; !to_next && j < c->spring_arr_drul_[RIGHT].size( ); j++) - { - Column_spring &sp = c->spring_arr_drul_[RIGHT] [j]; - if (sp.other_l_ != cols[i+1]) - continue; + if (ragged) + spacer_->my_solve_natural_len (); + else + spacer_->my_solve_linelen (); - to_next = &sp; - } + positions->force_ = spacer_->force_; - Spring_description desc; - if (to_next) - { - desc.hooke_f_ = to_next->strength_f_; - desc.ideal_f_ = to_next->distance_f_; - } - else - { - desc.hooke_f_ = 1.0; - desc.ideal_f_ = default_space_f_; - } - desc.block_force_f_ = - desc.hooke_f_ * desc.ideal_f_; // block at distance 0 - springs_.push (desc); + /* + We used to have a penalty for compression, no matter what, but that + fucked up wtk1-fugue2 (taking 3 full pages.) + */ + positions->config_.push (spacer_->indent_); + for (int i = 0; i < spacer_->springs_.size (); i++) + { + Real l = spacer_->springs_[i].length ((ragged) ? 0.0 : spacer_->force_); + positions->config_.push (positions->config_.top () + l); + /* + we have l>= 0 here, up to rounding errors + */ } - - for (int i=0; i < cols.size () - 1; i++) + + /* + For raggedright, we must have a measure of music density: this is + to prevent lots of short lines (which all have force = 0). + */ + if (ragged) { - Array * rods = &cols [i]->minimal_dists_arr_drul_[RIGHT]; - for (int j =0; j < rods->size( ); j++) + positions->satisfies_constraints_ + = positions->config_.top () < spacer_->line_len_; + } + else + positions->satisfies_constraints_ = spacer_->is_active (); + + positions->cols_ = spaced_cols_; + positions->loose_cols_ = loose_cols_; + + /* + Check if breaking constraints are met. + */ + bool break_satisfy = true; + int sz = positions->cols_.size (); + for (int i = sz; i--;) + { + SCM p = positions->cols_[i]->get_property ("penalty"); + if (scm_is_number (p)) { - int oi = cols.find_i (rods->elem (j).other_l_ ); - if (oi >= 0) - { - add_rod (i, oi, rods->elem (j).distance_f_); - } + if (scm_to_double (p) < -9999) + break_satisfy = break_satisfy && (i == 0 || i == sz -1); + if (scm_to_double (p) > 9999) + break_satisfy = break_satisfy && ! (i == 0 || i == sz -1); } } - if (line_len_f_ < 0) - my_solve_natural_len (); - else - my_solve_linelen (); + positions->satisfies_constraints_ + = positions->satisfies_constraints_ && break_satisfy; } void -Simple_spacer::solve (Column_x_positions *positions) const +Simple_spacer::add_spring (Real ideal, Real hooke) { - positions->energy_f_ = energy_f (); // abs (force_f_); - positions->config_.push (indent_f_); - for (int i=0; i config_.push (positions->config_.top () + springs_[i].length (force_f_)); + programming_error ("insane spring found, setting to unit"); + + desc.hooke_ = 1.0; + desc.ideal_ = 1.0; } - positions->satisfies_constraints_b_ = active_b (); -} + if (isinf (hooke)) + { + desc.is_active_ = false; + } + else + { + /* + desc.is_active_ ? + */ + desc.block_force_ = -desc.hooke_ * desc.ideal_; // block at distance 0 -void -Simple_spacer::lower_bound_solution (Column_x_positions * posns) const -{ - solve (posns); + active_count_++; + } + springs_.push (desc); } - -Spring_description::Spring_description( ) +static int +compare_paper_column_rank (Grob *const &a, + Grob *const &b) { - ideal_f_ =0.0; - hooke_f_ =0.0; - active_b_ = true; - block_force_f_ = 0.0; + return Paper_column::get_rank (a) - Paper_column::get_rank (b); } -Real -Spring_description::energy_f (Real force) const +void +Simple_spacer_wrapper::add_columns (Link_array const &icols) { - Real stretch = (force >? block_force_f_) / hooke_f_; - Real e = 0.5 * stretch * stretch * hooke_f_; + Link_array cols (icols); - /* - be harder to compress. - */ - if (stretch < 0) - e *= 4; + for (int i = cols.size (); i--;) + if (scm_is_pair (cols[i]->get_property ("between-cols"))) + { + loose_cols_.push (cols[i]); + cols.del (i); + } + + spaced_cols_ = cols; + for (int i = 0; i < cols.size () - 1; i++) + { + Spring_smob *spring = 0; + + for (SCM s = cols[i]->get_property ("ideal-distances"); + !spring && scm_is_pair (s); + s = scm_cdr (s)) + { + Spring_smob *sp = unsmob_spring (scm_car (s)); + + if (sp->other_ == cols[i + 1]) + spring = sp; + } + + if (!spring) + programming_error (_f ("No spring between column %d and next one", + Paper_column::get_rank (cols[i]))); + + Real ideal = (spring) ? spring->distance_ : spacer_->default_space_; + Real hooke = (spring) ? spring->strength_ : 1.0; + + spacer_->add_spring (ideal, hooke); + } - return e; + for (int i = 0; i < cols.size () - 1; i++) + { + for (SCM s = Spaceable_grob::get_minimum_distances (cols[i]); + scm_is_pair (s); s = scm_cdr (s)) + { + Grob *other = unsmob_grob (scm_caar (s)); + int oi = binsearch_links (cols, other, &compare_paper_column_rank); + if (oi >= 0 + && cols[oi] == other) + { + spacer_->add_rod (i, oi, scm_to_double (scm_cdar (s))); + } + } + + if (i + && !to_boolean (cols[i]->get_property ("allow-outside-line"))) + { + Interval e = cols[i]->extent (cols[i], X_AXIS); + if (!e.is_empty ()) + { + spacer_->add_rod (i, cols.size () - 1, e[RIGHT]); + spacer_->add_rod (0, i, e[LEFT]); + } + } + } } -Real -Simple_spacer::energy_f () const +Simple_spacer_wrapper::Simple_spacer_wrapper () +{ + spacer_ = new Simple_spacer (); +} + +Simple_spacer_wrapper::~Simple_spacer_wrapper () { - Real e =0.; + delete spacer_; +} - for (int i=0; i