source file of the GNU LilyPond music typesetter
- (c) 1999--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ (c) 1999--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
TODO:
- add support for different stretch/shrink constants?
Simple_spacer::Simple_spacer ()
{
- force_ = 0.;
+ line_len_ = 0.0;
+ force_ = 0.0;
fits_ = true;
+ ragged_ = true;
}
Real
-Simple_spacer::force ()
+Simple_spacer::force () const
{
return force_;
}
bool
-Simple_spacer::fits ()
+Simple_spacer::fits () const
{
return fits_;
}
}
Real
-Simple_spacer::configuration_length () const
+Simple_spacer::configuration_length (Real force) const
{
Real l = 0.;
for (vsize i = 0; i < springs_.size (); i++)
- l += springs_[i].length (force_);
+ l += springs_[i].length (force);
return l;
}
void
Simple_spacer::solve (Real line_len, bool ragged)
{
- Real conf = configuration_length ();
+ Real conf = configuration_length (force_);
ragged_ = ragged;
line_len_ = line_len;
- if (ragged)
- {
- force_ = 0;
- fits_ = configuration_length () <= line_len_;
- /* we need to calculate a force here to prevent a bunch of short lines */
- if (fits_)
- force_ = expand_line ();
- }
- else if (conf < line_len_)
+ if (conf < line_len_)
force_ = expand_line ();
else if (conf > line_len_)
force_ = compress_line ();
+
+ if (ragged && force_ < 0)
+ fits_ = false;
}
Real
Simple_spacer::expand_line ()
{
double inv_hooke = 0;
- double cur_len = configuration_length ();
+ double cur_len = configuration_length (force_);
fits_ = true;
for (vsize i=0; i < springs_.size (); i++)
Simple_spacer::compress_line ()
{
double inv_hooke = 0;
- double cur_len = configuration_length ();
+ double cur_len = configuration_length (force_);
double cur_force = force_;
fits_ = true;
break;
double block_dist = (cur_force - sp.block_force_) * inv_hooke;
- if (cur_len - block_dist <= line_len_)
- return cur_force + (line_len_ - cur_len) / inv_hooke;
+ if (cur_len - block_dist < line_len_)
+ {
+ cur_force += (line_len_ - cur_len) / inv_hooke;
+ cur_len = line_len_;
+
+ /*
+ Paranoia check.
+ */
+ assert (fabs (configuration_length (cur_force) - cur_len) < 1e-6);
+ return cur_force;
+ }
+
cur_len -= block_dist;
inv_hooke -= sp.inverse_hooke_;
cur_force = sp.block_force_;
void
Simple_spacer::add_spring (Real ideal, Real inverse_hooke)
{
- Spring_description desc;
+ Spring_description description;
- desc.ideal_ = ideal;
- desc.inverse_hooke_ = inverse_hooke;
- if (!desc.is_sane ())
+ description.ideal_ = ideal;
+ description.inverse_hooke_ = inverse_hooke;
+ if (!description.is_sane ())
{
programming_error ("insane spring found, setting to unit");
- desc.inverse_hooke_ = 1.0;
- desc.ideal_ = 1.0;
+ description.inverse_hooke_ = 1.0;
+ description.ideal_ = 1.0;
}
- desc.block_force_ = -desc.ideal_ / desc.inverse_hooke_;
+ description.block_force_ = -description.ideal_ / description.inverse_hooke_;
// block at distance 0
- springs_.push_back (desc);
+ springs_.push_back (description);
}
vector<Real>
ret.push_back (0.);
for (vsize i = 0; i < springs_.size (); i++)
- ret.push_back (ret.back () + springs_[i].length (ragged_ ? 0.0 : force_));
+ ret.push_back (ret.back () + springs_[i].length (ragged_ && force_ > 0 ? 0.0 : force_));
return ret;
}
+Real
+Simple_spacer::force_penalty (bool ragged) const
+{
+ /* If we are ragged-right, we don't want to penalise according to the force,
+ but according to the amount of whitespace that is present after the end
+ of the line. */
+ if (ragged)
+ return max (0.0, line_len_ - configuration_length (0.0));
+
+ /* Use a convex compression penalty. */
+ Real f = force_;
+ return f - (f < 0 ? f*f*f*f*4 : 0);
+}
+
/****************************************************************/
Spring_description::Spring_description ()
{
return (inverse_hooke_ >= 0)
&& ideal_ > 0
- && !isinf (ideal_) && !isnan (ideal_);
+ && !isinf (ideal_) && !isnan (ideal_)
+ && (inverse_hooke_ == 0.0 || fabs (inverse_hooke_) > 1e-8)
+ ;
}
Real
this closely.
*/
-struct Rod_desc
+struct Rod_description
{
vsize r_;
Real dist_;
- bool operator< (const Rod_desc r)
+ bool operator< (const Rod_description r)
{
return r_ < r.r_;
}
- Rod_desc ()
+ Rod_description ()
{
r_ = 0;
dist_ = 0;
}
- Rod_desc (vsize r, Real d)
+ Rod_description (vsize r, Real d)
{
r_ = r;
dist_ = d;
}
};
-struct Column_desc
+struct Column_description
{
- vector<Rod_desc> rods_;
- vector<Rod_desc> end_rods_; /* use these if they end at the last column of the line */
+ vector<Rod_description> rods_;
+ vector<Rod_description> end_rods_; /* use these if they end at the last column of the line */
Real ideal_;
Real inverse_hooke_;
Real end_ideal_;
SCM break_permission_;
Interval keep_inside_line_;
- Column_desc ()
+ Column_description ()
{
ideal_ = 0;
inverse_hooke_ = 0;
}
};
-static int compare_paper_column_rank (Grob *const &a, Grob *const &b);
-
static bool
is_loose (Grob *g)
{
return 0;
}
-/* this only returns non-NULL if the line-ending column is the next
- spaceable-or-breakable column */
-static Grob*
-next_line_ending_column (vector<Grob*> const &list, vsize starting)
-{
- vsize i = starting + 1;
- for (; i < list.size ()
- && is_loose (list[i])
- && !Paper_column::is_breakable (list[i]);
- i++)
- ;
- return dynamic_cast<Item*> (list[i])->find_prebroken_piece (LEFT);
-}
-
-static void
-get_column_spring (Grob *this_col, Grob *next_col, Real *ideal, Real *inv_hooke)
-{
- Spring_smob *spring = 0;
-
- for (SCM s = this_col->get_object ("ideal-distances");
- !spring && scm_is_pair (s);
- s = scm_cdr (s))
- {
- Spring_smob *sp = unsmob_spring (scm_car (s));
-
- if (sp->other_ == next_col)
- spring = sp;
- }
-
- if (!spring)
- programming_error (_f ("No spring between column %d and next one",
- Paper_column::get_rank (this_col)));
-
- *ideal = (spring) ? spring->distance_ : 5.0;
- *inv_hooke = (spring) ? spring->inverse_strength_ : 1.0;
-}
-
-static Column_desc
-get_column_desc (vector<Grob*> const &cols, vsize col_index, bool line_starter)
+static Column_description
+get_column_description (vector<Grob*> const &cols, vsize col_index, bool line_starter)
{
Grob *col = cols[col_index];
if (line_starter)
col = maybe_find_prebroken_piece (col, RIGHT);
- Column_desc desc;
+ Column_description description;
Grob *next_col = next_spaceable_column (cols, col_index);
if (next_col)
- get_column_spring (col, next_col, &desc.ideal_, &desc.inverse_hooke_);
- Grob *end_col = next_line_ending_column (cols, col_index);
+ Spaceable_grob::get_spring (col, next_col, &description.ideal_, &description.inverse_hooke_);
+ Grob *end_col = dynamic_cast<Item*> (cols[col_index+1])->find_prebroken_piece (LEFT);
if (end_col)
- get_column_spring (col, end_col, &desc.end_ideal_, &desc.end_inverse_hooke_);
+ Spaceable_grob::get_spring (col, end_col, &description.end_ideal_, &description.end_inverse_hooke_);
for (SCM s = Spaceable_grob::get_minimum_distances (col);
scm_is_pair (s); s = scm_cdr (s))
{
Grob *other = unsmob_grob (scm_caar (s));
- vsize j = binary_search (cols, other, &compare_paper_column_rank, col_index);
+ vsize j = binary_search (cols, other, Paper_column::less_than, col_index);
if (j != VPOS)
{
if (cols[j] == other)
- desc.rods_.push_back (Rod_desc (j, scm_to_double (scm_cdar (s))));
+ description.rods_.push_back (Rod_description (j, scm_to_double (scm_cdar (s))));
else /* it must end at the LEFT prebroken_piece */
- desc.end_rods_.push_back (Rod_desc (j, scm_to_double (scm_cdar (s))));
+ description.end_rods_.push_back (Rod_description (j, scm_to_double (scm_cdar (s))));
}
}
+
if (!line_starter && to_boolean (col->get_property ("keep-inside-line")))
- desc.keep_inside_line_ = col->extent (col, X_AXIS);
- desc.break_permission_ = col->get_property ("line-break-permission");
- return desc;
+ description.keep_inside_line_ = col->extent (col, X_AXIS);
+
+ description.break_permission_ = col->get_property ("line-break-permission");
+ return description;
}
vector<Real>
-get_line_forces (vector<Grob*> const &icols, vector<vsize> breaks,
+get_line_forces (vector<Grob*> const &columns,
Real line_len, Real indent, bool ragged)
{
+ vector<vsize> breaks;
vector<Real> force;
- force.resize (breaks.size () * breaks.size (), infinity_f);
-
- vector<Column_desc> cols;
- vsize b = 1;
+ vector<Grob*> non_loose;
+ vector<Column_description> cols;
SCM force_break = ly_symbol2scm ("force");
- cols.push_back (Column_desc ());
- for (vsize i = 1; i < icols.size () - 1; i++)
+ for (vsize i = 0; i < columns.size (); i++)
+ if (!is_loose (columns[i]) || Paper_column::is_breakable (columns[i]))
+ non_loose.push_back (columns[i]);
+
+ breaks.clear ();
+ breaks.push_back (0);
+ cols.push_back (Column_description ());
+ for (vsize i = 1; i + 1 < non_loose.size (); i++)
{
- if (b < breaks.size () && breaks[b] == i)
- {
- breaks[b] = cols.size ();
- b++;
- }
- if (!is_loose (icols[i]))
- cols.push_back (get_column_desc (icols, i, false));
+ if (Paper_column::is_breakable (non_loose[i]))
+ breaks.push_back (cols.size ());
+
+ cols.push_back (get_column_description (non_loose, i, false));
}
- breaks.back () = cols.size () - 1;
+ breaks.push_back (cols.size ());
+ force.resize (breaks.size () * breaks.size (), infinity_f);
- for (vsize b = 0; b < breaks.size () - 1; b++)
+ for (vsize b = 0; b + 1 < breaks.size (); b++)
{
- cols[breaks[b]] = get_column_desc (icols, breaks[b], true);
+ cols[breaks[b]] = get_column_description (non_loose, breaks[b], true);
vsize st = breaks[b];
for (vsize c = b+1; c < breaks.size (); c++)
for (vsize i = breaks[b]; i < end - 1; i++)
spacer.add_spring (cols[i].ideal_, cols[i].inverse_hooke_);
- spacer.add_spring (cols[end-1].end_ideal_, cols[end-1].inverse_hooke_);
+ spacer.add_spring (cols[end-1].end_ideal_, cols[end-1].end_inverse_hooke_);
for (vsize i = breaks[b]; i < end; i++)
if (!cols[i].keep_inside_line_.is_empty ())
{
spacer.add_rod (i - st, end - st, cols[i].keep_inside_line_[RIGHT]);
- spacer.add_rod (0, i - st, cols[i].keep_inside_line_[LEFT]);
+ spacer.add_rod (0, i - st, -cols[i].keep_inside_line_[LEFT]);
}
}
spacer.solve ((b == 0) ? line_len - indent : line_len, ragged);
- force[b * breaks.size () + c] = spacer.force ();
+ force[b * breaks.size () + c] = spacer.force_penalty (ragged);
- if (cols[end].break_permission_ == force_break)
- break;
if (!spacer.fits ())
{
- force[b * breaks.size () + c] = infinity_f;
+ if (c == b + 1)
+ force[b * breaks.size () + c] = -200000;
+ else
+ force[b * breaks.size () + c] = infinity_f;
break;
}
+ if (end < cols.size () && cols[end].break_permission_ == force_break)
+ break;
}
}
return force;
}
Column_x_positions
-get_line_configuration (vector<Grob*>const &columns,
+get_line_configuration (vector<Grob*> const &columns,
Real line_len,
Real indent,
bool ragged)
{
- vector<Column_desc> cols;
+ vector<Column_description> cols;
Simple_spacer spacer;
Column_x_positions ret;
ret.cols_.push_back (dynamic_cast<Item*> (columns[0])->find_prebroken_piece (RIGHT));
- for (vsize i = 1; i < columns.size () - 1; i++)
+ for (vsize i = 1; i + 1 < columns.size (); i++)
{
if (is_loose (columns[i]))
ret.loose_cols_.push_back (columns[i]);
}
ret.cols_.push_back (dynamic_cast<Item*> (columns.back ())->find_prebroken_piece (LEFT));
- cols.resize (ret.cols_.size () - 1);
-
/* since we've already put our line-ending column in the column list, we can ignore
- the end_XXX_ fields of our column_desc */
- for (vsize i = 0; i < cols.size (); i++)
+ the end_XXX_ fields of our column_description */
+ for (vsize i = 0; i + 1 < ret.cols_.size (); i++)
{
- cols[i] = get_column_desc (ret.cols_, i, i == 0);
+ cols.push_back (get_column_description (ret.cols_, i, i == 0));
spacer.add_spring (cols[i].ideal_, cols[i].inverse_hooke_);
}
for (vsize i = 0; i < cols.size (); i++)
{
for (vsize r = 0; r < cols[i].rods_.size (); r++)
spacer.add_rod (i, cols[i].rods_[r].r_, cols[i].rods_[r].dist_);
+
if (!cols[i].keep_inside_line_.is_empty ())
{
spacer.add_rod (i, cols.size (), cols[i].keep_inside_line_[RIGHT]);
- spacer.add_rod (0, i, cols[i].keep_inside_line_[LEFT]);
+ spacer.add_rod (0, i, -cols[i].keep_inside_line_[LEFT]);
}
}
spacer.solve (line_len, ragged);
- ret.force_ = spacer.force ();
+ ret.force_ = spacer.force_penalty (ragged);
- /*
- We used to have a penalty for compression, no matter what, but that
- fucked up wtk1-fugue2 (taking 3 full pages.)
- */
ret.config_ = spacer.spring_positions ();
for (vsize i = 0; i < ret.config_.size (); i++)
ret.config_[i] += indent;
/*
Check if breaking constraints are met.
*/
- for (vsize i = 1; i < ret.cols_.size () - 1; i++)
+ for (vsize i = 1; i + 1 < ret.cols_.size (); i++)
{
SCM p = ret.cols_[i]->get_property ("line-break-permission");
if (p == ly_symbol2scm ("force"))
return ret;
}
-static int
-compare_paper_column_rank (Grob *const &a,
- Grob *const &b)
-{
- return Paper_column::get_rank (a) - Paper_column::get_rank (b);
-}
projects / lilypond.git / blobdiff