-/*
+/*
simple-spacer.cc -- implement Simple_spacer
-
+
source file of the GNU LilyPond music typesetter
-
- (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+
+ (c) 1999--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
TODO:
- add support for different stretch/shrink constants?
-
*/
-#include <stdio.h>
+
+#include <cstdio>
#include <math.h>
-#include <libc-extension.hh> // isinf
+#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:
+ A simple spacing constraint solver. The approach:
+
+ Stretch the line uniformly until none of the constraints (rods)
+ block. It then is very wide.
- Stretch the line uniformly until none of the constraints (rods)
- block. It then is very wide.
+ Compress until the next constraint blocks,
- Compress until the next constraint blocks,
+ Mark the springs over the constrained part to be non-active.
- 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.
+ 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
+ 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
+ c4 c4 c4 c4
+ veryveryverylongsyllable2 veryveryverylongsyllable2
+ " "4 veryveryverylongsyllable2 syllable4
- can be further compressed to
+ can be further compressed to
- c4 c4 c4 c4
- veryveryverylongsyllable2 veryveryverylongsyllable2
- " "4 veryveryverylongsyllable2 syllable4
+ c4 c4 c4 c4
+ veryveryverylongsyllable2 veryveryverylongsyllable2
+ " "4 veryveryverylongsyllable2 syllable4
- Perhaps this is not a bad thing, because the 1st looks better anyway. */
+ Perhaps this is not a bad thing, because the 1st looks better anyway. */
+/*
+ positive force = expanding, negative force = compressing.
+*/
Simple_spacer::Simple_spacer ()
{
*/
active_count_ = 0;
force_ = 0.;
- indent_ =0.0;
+ indent_ = 0.0;
default_space_ = 20 PT;
}
{
if (isinf (dist) || isnan (dist))
{
- programming_error ("Weird minimum distance. Ignoring");
+ programming_error ("ignoring weird minimum distance");
return;
}
- Real c = range_stiffness (l,r);
+ 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.
- */
+ we let the rod override the spring.
+ */
Real total_dist = 0.;
- for (int i = l ; i < r; i++)
+ 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;
+ for (int i = l; i < r; i++)
+ springs_[i].ideal_ *= dist / total_dist;
return;
}
-
- Real d = range_ideal_len (l,r);
+
+ Real d = range_ideal_len (l, r);
Real block_stretch = dist - d;
-
+
Real block_force = c * block_stretch;
force_ = force_ >? block_force;
- for (int i=l; i < r; i++)
+ for (int i = l; i < r; i++)
springs_[i].block_force_ = block_force >?
- springs_[i].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++)
+ 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++)
+ Real den = 0.0;
+ for (int i = l; i < r; i++)
{
if (springs_[i].is_active_)
den += 1 / springs_[i].hooke_;
Real
Simple_spacer::active_blocking_force () const
{
- Real bf = - infinity_f;
- for (int i=0; i < springs_.size (); i++)
+ Real bf = -infinity_f;
+ for (int i = 0; i < springs_.size (); i++)
if (springs_[i].is_active_)
{
bf = bf >? springs_[i].block_force_;
Real
Simple_spacer::active_springs_stiffness () const
{
- Real stiff = range_stiffness (0, springs_.size ());
+ 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++)
+ for (int i = 0; i < springs_.size (); i++)
{
if (springs_[i].block_force_ > max_block_force)
{
}
}
- stiff = springs_[max_i].hooke_;
+ stiff = springs_[max_i].hooke_;
}
return stiff;
}
Simple_spacer::set_active_states ()
{
/* float comparison is safe, since force is only copied. */
- for (int i=0 ; i <springs_.size (); i++)
+ 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_ --;
+ active_count_--;
}
-}
+}
Real
Simple_spacer::configuration_length () const
{
- Real l =0.;
- for (int i=0; i < springs_.size (); i++)
+ Real l = 0.;
+ for (int i = 0; i < springs_.size (); i++)
l += springs_[i].length (force_);
return l;
bool
Simple_spacer::is_active () const
{
- return active_count_;
+ return active_count_;
}
void
}
}
-
void
Simple_spacer::my_solve_natural_len ()
{
Real line_len_force = 0.0;
-
+
while (is_active ())
{
force_ = active_blocking_force () >? 0.0;
{
line_len_force = force_
+ (line_len_ - conf)
- * active_springs_stiffness();
+ * active_springs_stiffness ();
}
-
+
if (force_ < 1e-8) // ugh.,
break;
-
+
set_active_states ();
}
force_ = line_len_force;
}
-LY_DEFINE(ly_solve_spring_rod_problem, "ly:solve-spring-rod-problem",
- 4, 1, 0, (SCM springs, SCM rods, SCM length, SCM ragged),
- "Solve a spring and rod problem for @var{count} objects, that "
- "are connected by @var{count-1} springs, and an arbitrary number of rods "
- "Springs have the format (ideal, hooke) and rods (idx1, idx2, distance) "
- "@var{length} is a number, @var{ragged} a boolean "
- "Return: a list containing the force (#f for non-satisfied constraints) "
- "followed by the @var{spring-count}+1 positions of the objects. "
- )
-{
- int len = scm_ilength (springs);
- if (len == 0)
- return scm_list_2 (scm_from_double (0.0), scm_from_double (0.0));
-
- SCM_ASSERT_TYPE (len >= 0, springs, SCM_ARG1, __FUNCTION__, "list of springs");
- SCM_ASSERT_TYPE (scm_ilength (rods) >= 0, rods, SCM_ARG2, __FUNCTION__, "list of rods");
- SCM_ASSERT_TYPE (scm_is_number (length) || length == SCM_BOOL_F,
- length, SCM_ARG3, __FUNCTION__, "number or #f");
-
-
- bool is_ragged = ragged == SCM_BOOL_T;
- Simple_spacer spacer;
- for (SCM s = springs; scm_is_pair (s); s = ly_cdr (s))
- {
- Real ideal = scm_to_double (ly_caar (s));
- Real hooke = scm_to_double (ly_cadar (s));
-
- spacer.add_spring (ideal, hooke);
- }
-
- for (SCM s = rods; scm_is_pair (s); s = ly_cdr (s))
- {
- SCM entry = ly_car (s);
- int l = scm_to_int (ly_car (entry));
- int r = scm_to_int (ly_cadr (entry));
- entry = ly_cddr (entry);
-
- Real distance = scm_to_double (ly_car (entry));
- spacer.add_rod (l, r, distance);
- }
-
- spacer.line_len_ = scm_to_double (length);
-
- if (is_ragged)
- spacer.my_solve_natural_len ();
- else
- spacer.my_solve_linelen ();
-
- Array<Real> posns;
- posns.push (0.0);
- for (int i = 0; i < spacer.springs_.size(); i++)
- {
- Real l = spacer.springs_[i].length ((is_ragged) ? 0.0 : spacer.force_);
- posns.push (posns.top() + l);
- }
-
- SCM force_return = SCM_BOOL_F;
- if (!isinf (spacer.force_)
- && spacer.is_active ())
- {
- force_return = scm_from_double (spacer.force_);
- }
-
- SCM retval= SCM_EOL;
- for (int i = posns.size(); i--;)
- {
- retval = scm_cons (scm_from_double (posns[i]), retval);
- }
-
- retval = scm_cons (force_return, retval);
- return retval;
-}
-
-
/****************************************************************/
Spring_description::Spring_description ()
{
- ideal_ =0.0;
- hooke_ =0.0;
+ ideal_ = 0.0;
+ hooke_ = 0.0;
is_active_ = true;
block_force_ = 0.0;
}
-
bool
Spring_description::is_sane () const
{
{
if (!is_active_)
f = block_force_;
- return ideal_ + f / hooke_ ;
+ 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_wrapper::solve (Column_x_positions *positions, bool ragged)
+Simple_spacer_wrapper::solve (Column_x_positions *positions, bool ragged)
{
if (ragged)
spacer_->my_solve_natural_len ();
spacer_->my_solve_linelen ();
positions->force_ = spacer_->force_;
-
+
/*
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++)
+ for (int i = 0; i < spacer_->springs_.size (); i++)
{
- Real l = spacer_->springs_[i].length ((ragged) ? 0.0 : spacer_->force_);
+ 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
+ we have l>= 0 here, up to rounding errors
*/
}
/*
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)
{
- positions->satisfies_constraints_ =
- positions->config_.top () < spacer_->line_len_ ;
+ 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_;
- positions->satisfies_constraints_ =
- positions->satisfies_constraints_ && spacer_->is_active ();
/*
Check if breaking constraints are met.
- */
+ */
bool break_satisfy = true;
- int sz = positions->cols_.size ();
- for (int i = sz; i--; )
+ int sz = positions->cols_.size ();
+ for (int i = sz; i--;)
{
- SCM p = positions->cols_[i]->get_property ( "penalty");
+ SCM p = positions->cols_[i]->get_property ("penalty");
if (scm_is_number (p))
{
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);
+ break_satisfy = break_satisfy && ! (i == 0 || i == sz -1);
}
-
}
- positions->satisfies_constraints_ =
- positions->satisfies_constraints_ && break_satisfy;
+ positions->satisfies_constraints_
+ = positions->satisfies_constraints_ && break_satisfy;
}
void
desc.hooke_ = hooke;
if (!desc.is_sane ())
{
- programming_error ("Insane spring found. Setting to unit spring.");
+ programming_error ("insane spring found, setting to unit");
desc.hooke_ = 1.0;
desc.ideal_ = 1.0;
}
-
+
if (isinf (hooke))
{
desc.is_active_ = false;
else
{
/*
- desc.is_active_ ?
+ desc.is_active_ ?
*/
- desc.block_force_ = - desc.hooke_ * desc.ideal_; // block at distance 0
-
- active_count_ ++;
+ desc.block_force_ = -desc.hooke_ * desc.ideal_; // block at distance 0
+
+ active_count_++;
}
springs_.push (desc);
}
+static int
+compare_paper_column_rank (Grob *const &a,
+ Grob *const &b)
+{
+ return Paper_column::get_rank (a) - Paper_column::get_rank (b);
+}
+
void
Simple_spacer_wrapper::add_columns (Link_array<Grob> const &icols)
{
Link_array<Grob> cols (icols);
-
- for (int i = cols.size (); i--;)
+
+ 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++)
+ 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 = ly_cdr (s))
+ s = scm_cdr (s))
{
- Spring_smob *sp = unsmob_spring (ly_car (s));
-
-
- if (sp->other_ == cols[i+1])
+ 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])
- ));
+ 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);
}
-
- for (int i=0; i < cols.size () - 1; i++)
+
+ for (int i = 0; i < cols.size () - 1; i++)
{
for (SCM s = Spaceable_grob::get_minimum_distances (cols[i]);
- scm_is_pair (s); s = ly_cdr (s))
+ scm_is_pair (s); s = scm_cdr (s))
{
- Grob * other = unsmob_grob (ly_caar (s));
- int oi = cols.find_index (other);
- if (oi >= 0)
+ 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 (ly_cdar (s)));
+ 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]);
}
}
}
delete spacer_;
}
-
-Simple_spacer_wrapper::Simple_spacer_wrapper (Simple_spacer_wrapper const&)
+Simple_spacer_wrapper::Simple_spacer_wrapper (Simple_spacer_wrapper const &)
{
}
projects / lilypond.git / blobdiff