/*
- simple-spacer.cc -- implement Simple_spacer
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
-
- (c) 1999--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1999--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
TODO:
- add support for different stretch/shrink constants?
+
+ 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 <http://www.gnu.org/licenses/>.
*/
#include <cstdio>
+#include "column-description.hh"
#include "column-x-positions.hh"
#include "dimensions.hh"
#include "international.hh"
-#include "libc-extension.hh" // isinf
+#include "libc-extension.hh" // isinf
#include "paper-column.hh"
#include "simple-spacer.hh"
#include "spaceable-grob.hh"
return force_;
}
+Real
+Simple_spacer::line_len () const
+{
+ return line_len_;
+}
+
bool
Simple_spacer::fits () const
{
{
Real spring_dist = range_ideal_len (l, r);
if (spring_dist < dist)
- for (int i = l; i < r; i++)
- {
- if (spring_dist)
- springs_[i].set_distance (springs_[i].distance () * dist / spring_dist);
- else
- springs_[i].set_distance (dist / (r - l));
- }
+ for (int i = l; i < r; i++)
+ {
+ if (spring_dist)
+ springs_[i].set_distance (springs_[i].distance () * dist / spring_dist);
+ else
+ springs_[i].set_distance (dist / (r - l));
+ }
return;
}
Real den = 0.0;
for (int i = l; i < r; i++)
den += stretch ? springs_[i].inverse_stretch_strength ()
- : springs_[i].inverse_compress_strength ();
+ : springs_[i].inverse_compress_strength ();
return 1 / den;
}
double cur_len = configuration_length (force_);
fits_ = true;
- for (vsize i=0; i < springs_.size (); i++)
+ for (vsize i = 0; i < springs_.size (); i++)
inv_hooke += springs_[i].inverse_stretch_strength ();
if (inv_hooke == 0.0) /* avoid division by zero. If springs are infinitely stiff */
Real
Simple_spacer::compress_line ()
{
- double inv_hooke = 0;
double cur_len = configuration_length (force_);
double cur_force = force_;
bool compressed = false;
}
fits_ = true;
- for (vsize i=0; i < springs_.size (); i++)
- inv_hooke += compressed
- ? springs_[i].inverse_compress_strength ()
- : springs_[i].inverse_stretch_strength ();
assert (line_len_ <= cur_len);
vector<Spring> sorted_springs = springs_;
sort (sorted_springs.begin (), sorted_springs.end (), greater<Spring> ());
- for (vsize i = 0; i < sorted_springs.size (); i++)
+ /* inv_hooke is the total flexibility of currently-active springs */
+ double inv_hooke = 0;
+ vsize i = sorted_springs.size ();
+ for (; i && sorted_springs[i - 1].blocking_force () < cur_force; i--)
+ inv_hooke += compressed
+ ? sorted_springs[i - 1].inverse_compress_strength ()
+ : sorted_springs[i - 1].inverse_stretch_strength ();
+ /* i now indexes the first active spring, so */
+ for (; i < sorted_springs.size (); i++)
{
Spring sp = sorted_springs[i];
- assert (sp.blocking_force () <= cur_force);
if (isinf (sp.blocking_force ()))
- break;
+ break;
double block_dist = (cur_force - sp.blocking_force ()) * 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_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_compress_strength ();
+ inv_hooke -= compressed ? sp.inverse_compress_strength () : sp.inverse_stretch_strength ();
cur_force = sp.blocking_force ();
}
/* Use a convex compression penalty. */
Real f = force_;
- return f - (f < 0 ? f*f*f*f*2 : 0);
+ return f - (f < 0 ? f * f * f * f * 2 : 0);
}
/****************************************************************/
-struct Rod_description
-{
- vsize r_;
- Real dist_;
-
- bool operator< (const Rod_description r)
- {
- return r_ < r.r_;
- }
-
- Rod_description ()
- {
- r_ = 0;
- dist_ = 0;
- }
-
- Rod_description (vsize r, Real d)
- {
- r_ = r;
- dist_ = d;
- }
-};
-
-struct Column_description
-{
- vector<Rod_description> rods_;
- vector<Rod_description> end_rods_; /* use these if they end at the last column of the line */
- Spring spring_;
- Spring end_spring_;
-
- SCM break_permission_;
- Interval keep_inside_line_;
-
- Column_description ()
- {
- break_permission_ = SCM_EOL;
- }
-};
-
-static bool
-is_loose (Grob *g)
-{
- return (scm_is_pair (g->get_object ("between-cols")));
-}
-
-static Grob*
-maybe_find_prebroken_piece (Grob *g, Direction d)
-{
- Grob *ret = dynamic_cast<Item*> (g)->find_prebroken_piece (d);
- if (ret)
- return ret;
- return g;
-}
-
-static Grob*
-next_spaceable_column (vector<Grob*> const &list, vsize starting)
-{
- for (vsize i = starting+1; i < list.size (); i++)
- if (!is_loose (list[i]))
- return list[i];
- return 0;
-}
-
-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_description description;
- Grob *next_col = next_spaceable_column (cols, col_index);
- if (next_col)
- description.spring_ = Spaceable_grob::get_spring (col, next_col);
-
- Grob *end_col = dynamic_cast<Item*> (cols[col_index+1])->find_prebroken_piece (LEFT);
- if (end_col)
- description.end_spring_ = Spaceable_grob::get_spring (col, end_col);
-
- 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, Paper_column::less_than, col_index);
- if (j != VPOS)
- {
- if (cols[j] == other)
- description.rods_.push_back (Rod_description (j, scm_to_double (scm_cdar (s))));
- else /* it must end at the LEFT prebroken_piece */
- 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")))
- 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 &columns,
- Real line_len, Real indent, bool ragged)
-{
- vector<vsize> breaks;
- vector<Real> force;
- vector<Grob*> non_loose;
- vector<Column_description> cols;
- SCM force_break = ly_symbol2scm ("force");
-
- 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 (Paper_column::is_breakable (non_loose[i]))
- breaks.push_back (cols.size ());
-
- cols.push_back (get_column_description (non_loose, i, false));
- }
- breaks.push_back (cols.size ());
- force.resize (breaks.size () * breaks.size (), infinity_f);
-
- for (vsize b = 0; b + 1 < breaks.size (); b++)
- {
- cols[breaks[b]] = get_column_description (non_loose, breaks[b], true);
- vsize st = breaks[b];
-
- for (vsize c = b+1; c < breaks.size (); c++)
- {
- vsize end = breaks[c];
- Simple_spacer spacer;
-
- for (vsize i = breaks[b]; i < end - 1; i++)
- spacer.add_spring (cols[i].spring_);
- spacer.add_spring (cols[end-1].end_spring_);
-
-
- for (vsize i = breaks[b]; i < end; i++)
- {
- for (vsize r = 0; r < cols[i].rods_.size (); r++)
- if (cols[i].rods_[r].r_ < end)
- spacer.add_rod (i - st, cols[i].rods_[r].r_ - st, cols[i].rods_[r].dist_);
- for (vsize r = 0; r < cols[i].end_rods_.size (); r++)
- if (cols[i].end_rods_[r].r_ == end)
- spacer.add_rod (i - st, end - st, cols[i].end_rods_[r].dist_);
- 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.solve ((b == 0) ? line_len - indent : line_len, ragged);
- force[b * breaks.size () + c] = spacer.force_penalty (ragged);
-
- if (!spacer.fits ())
- {
- 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,
- Real line_len,
- Real indent,
- bool ragged)
+get_line_configuration (vector<Grob *> const &columns,
+ Real line_len,
+ Real indent,
+ bool ragged)
{
vector<Column_description> cols;
Simple_spacer spacer;
Column_x_positions ret;
- ret.cols_.push_back (dynamic_cast<Item*> (columns[0])->find_prebroken_piece (RIGHT));
+ ret.cols_.push_back (dynamic_cast<Item *> (columns[0])->find_prebroken_piece (RIGHT));
for (vsize i = 1; i + 1 < columns.size (); i++)
{
- if (is_loose (columns[i]))
- ret.loose_cols_.push_back (columns[i]);
+ if (Paper_column::is_loose (columns[i]))
+ ret.loose_cols_.push_back (columns[i]);
else
- ret.cols_.push_back (columns[i]);
+ ret.cols_.push_back (columns[i]);
}
- ret.cols_.push_back (dynamic_cast<Item*> (columns.back ())->find_prebroken_piece (LEFT));
+ ret.cols_.push_back (dynamic_cast<Item *> (columns.back ())->find_prebroken_piece (LEFT));
/* since we've already put our line-ending column in the column list, we can ignore
the end_XXX_ fields of our column_description */
for (vsize i = 0; i + 1 < ret.cols_.size (); i++)
{
- cols.push_back (get_column_description (ret.cols_, i, i == 0));
+ cols.push_back (Column_description::get_column_description (ret.cols_, i, i == 0));
spacer.add_spring (cols[i].spring_);
}
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_);
+ 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 (i, cols.size (), cols[i].keep_inside_line_[RIGHT]);
+ spacer.add_rod (0, i, -cols[i].keep_inside_line_[LEFT]);
+ }
}
spacer.solve (line_len, ragged);
{
SCM p = ret.cols_[i]->get_property ("line-break-permission");
if (p == ly_symbol2scm ("force"))
- ret.satisfies_constraints_ = false;
+ ret.satisfies_constraints_ = false;
}
return ret;
}
+#include "ly-smobs.icc"
+
+IMPLEMENT_SIMPLE_SMOBS (Simple_spacer);
+IMPLEMENT_DEFAULT_EQUAL_P (Simple_spacer);
+
+SCM
+Simple_spacer::mark_smob (SCM /* x */)
+{
+ return SCM_EOL;
+}
+
+int
+Simple_spacer::print_smob (SCM /* x */, SCM p, scm_print_state *)
+{
+ scm_puts ("#<Simple spacer>", p);
+ return 1;
+}
+
projects / lilypond.git / blobdiff