}
Real
-Simple_spacer::is_activelocking_force () const
+Simple_spacer::active_blocking_force () const
{
Real bf = - infinity_f;
for (int i=0; i < springs_.size (); i++)
{
while (is_active ())
{
- force_ = is_activelocking_force ();
+ force_ = active_blocking_force ();
Real conf = configuration_length ();
if (conf < line_len_)
{
while (is_active ())
{
- force_ = is_activelocking_force () >? 0.0;
+ force_ = active_blocking_force () >? 0.0;
if (force_ < 1e-8) // ugh.,
break;
}
}
-void
-Simple_spacer::add_columns (Link_array<Grob> const &icols)
+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 positions of the objects."
+ )
{
- Link_array<Grob> cols (icols);
-
- for (int i = cols.size (); i--;)
- if (ly_c_pair_p (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++)
+ SCM_ASSERT_TYPE (scm_ilength (springs) >= 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; ly_c_pair_p (s); s = ly_cdr (s))
{
- Spring_smob *spring = 0;
+ Real ideal = scm_to_double (ly_caar (s));
+ Real hooke = scm_to_double (ly_cadar (s));
- for (SCM s = cols[i]->get_property ("ideal-distances");
- !spring && ly_c_pair_p (s);
- s = ly_cdr (s))
- {
- Spring_smob *sp = unsmob_spring (ly_car (s));
-
-
- if (sp->other_ == cols[i+1])
- spring = sp;
- }
-
- Spring_description desc;
- if (spring)
- {
- desc.ideal_ = spring->distance_;
- desc.hooke_ = spring->strength_;
- }
- else
- {
- programming_error (_f ("No spring between column %d and next one",
- Paper_column::get_rank (cols[i])
- ));
- desc.hooke_ = 1.0;
- desc.ideal_ = default_space_;
+ spacer.add_spring (ideal, hooke);
+ }
- continue;
- }
+ for (SCM s = rods; ly_c_pair_p (s); s = ly_cdr (s))
+ {
+ SCM entry = ly_car (s);
+ int l = scm_to_int (ly_car (s));
+ int r = scm_to_int (ly_cadr (s));
+ entry = ly_cddr (s);
+
+ Real distance = scm_to_double (ly_car (s));
+ spacer.add_rod (l, r, distance);
+ }
- if (!desc.is_sane ())
- {
- programming_error ("Insane spring found. Setting to unit spring.");
+ if (is_ragged)
+ spacer.my_solve_natural_len ();
+ else
+ {
+ spacer.line_len_ = scm_to_double (length);
+
+ spacer.my_solve_linelen ();
+ }
- desc.hooke_ = 1.0;
- desc.ideal_ = 1.0;
- }
+ 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);
+ }
- if (isinf (desc.hooke_))
- {
- desc.is_active_ = false;
- springs_.push (desc);
- }
+ SCM force_return = scm_from_double (spacer.force_);
+ if (is_ragged)
+ {
+ Real len = posns.top ();
+ if (spacer.line_len_ - len >= 0)
+ force_return = scm_from_double ((spacer.line_len_ - len)
+ * spacer.active_springs_stiffness ());
else
- {
- desc.block_force_ = - desc.hooke_ * desc.ideal_; // block at distance 0
- springs_.push (desc);
-
- active_count_ ++;
- }
+ force_return = SCM_BOOL_F;
}
-
- for (int i=0; i < cols.size () - 1; i++)
+
+ SCM retval= SCM_EOL;
+ for (int i = posns.size(); i--;)
{
- for (SCM s = Spaceable_grob::get_minimum_distances (cols[i]);
- ly_c_pair_p (s); s = ly_cdr (s))
- {
- Grob * other = unsmob_grob (ly_caar (s));
- int oi = cols.find_index (other);
- if (oi >= 0)
- {
- add_rod (i, oi, ly_scm2double (ly_cdar (s)));
- }
- }
+ 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;
+ is_active_ = true;
+ block_force_ = 0.0;
+}
+
+
+bool
+Spring_description::is_sane () const
+{
+ return (hooke_ > 0) && !isinf (ideal_) && !isnan (ideal_);
+}
+
+Real
+Spring_description::length (Real f) const
+{
+ if (!is_active_)
+ f = block_force_;
+ return ideal_ + f / hooke_ ;
}
+/****************************************************************/
+
/*
*/
void
-Simple_spacer::solve (Column_x_positions *positions, bool ragged)
+Simple_spacer_wrapper::solve (Column_x_positions *positions, bool ragged)
{
if (ragged)
- my_solve_natural_len ();
+ spacer_->my_solve_natural_len ();
else
- my_solve_linelen ();
+ spacer_->my_solve_linelen ();
- positions->force_ = force_;
+ 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 (indent_);
- for (int i=0; i <springs_.size (); i++)
+ positions->config_.push (spacer_->indent_);
+ for (int i=0; i < spacer_->springs_.size (); i++)
{
- Real l = springs_[i].length ((ragged) ? 0.0 : 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
if (ragged)
{
Real len = positions->config_.top ();
- if (line_len_ - len >= 0)
- positions->force_ = ((line_len_ - len) * active_springs_stiffness ());
+ if (spacer_->line_len_ - len >= 0)
+ positions->force_ = ((spacer_->line_len_ - len)
+ * spacer_->active_springs_stiffness ());
else
{
positions->force_ = 0.0;
positions->cols_ = spaced_cols_;
positions->loose_cols_ = loose_cols_;
positions->satisfies_constraints_ =
- positions->satisfies_constraints_ && is_active ();
+ positions->satisfies_constraints_ && spacer_->is_active ();
/*
Check if breaking constraints are met.
positions->satisfies_constraints_ && break_satisfy;
}
-/****************************************************************/
+void
+Simple_spacer::add_spring (Real ideal, Real hooke)
+{
+ Spring_description desc;
-Spring_description::Spring_description ()
+ desc.ideal_ = ideal;
+ desc.hooke_ = hooke;
+ if (!desc.is_sane ())
+ {
+ programming_error ("Insane spring found. Setting to unit spring.");
+
+ desc.hooke_ = 1.0;
+ desc.ideal_ = 1.0;
+ }
+
+ if (isinf (hooke))
+ {
+ desc.is_active_ = false;
+ }
+ else
+ {
+ /*
+ desc.is_active_ ?
+ */
+ desc.block_force_ = - desc.hooke_ * desc.ideal_; // block at distance 0
+
+ active_count_ ++;
+ }
+ springs_.push (desc);
+}
+
+void
+Simple_spacer_wrapper::add_columns (Link_array<Grob> const &icols)
{
- ideal_ =0.0;
- hooke_ =0.0;
- is_active_ = true;
- block_force_ = 0.0;
+ Link_array<Grob> cols (icols);
+
+ for (int i = cols.size (); i--;)
+ if (ly_c_pair_p (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 && ly_c_pair_p (s);
+ s = ly_cdr (s))
+ {
+ Spring_smob *sp = unsmob_spring (ly_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);
+ }
+
+ for (int i=0; i < cols.size () - 1; i++)
+ {
+ for (SCM s = Spaceable_grob::get_minimum_distances (cols[i]);
+ ly_c_pair_p (s); s = ly_cdr (s))
+ {
+ Grob * other = unsmob_grob (ly_caar (s));
+ int oi = cols.find_index (other);
+ if (oi >= 0)
+ {
+ spacer_->add_rod (i, oi, ly_scm2double (ly_cdar (s)));
+ }
+ }
+ }
}
+Simple_spacer_wrapper::Simple_spacer_wrapper ()
+{
+ spacer_ = new Simple_spacer ();
+}
-bool
-Spring_description::is_sane () const
+Simple_spacer_wrapper::~Simple_spacer_wrapper ()
{
- return (hooke_ > 0) && !isinf (ideal_) && !isnan (ideal_);
+ delete spacer_;
}
-Real
-Spring_description::length (Real f) const
+
+Simple_spacer_wrapper::Simple_spacer_wrapper (Simple_spacer_wrapper const&)
{
- if (!is_active_)
- f = block_force_;
- return ideal_ + f / hooke_ ;
}
projects / lilypond.git / commitdiff