source file of the GNU LilyPond music typesetter
- (c) 1997--1998, 1998 Han-Wen Nienhuys <hanwen@stack.nl>
- Jan Nieuwenhuizen <jan@digicash.com>
+ (c) 1997--1998, 1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
/*
[TODO]
- * lowest beam of (UP) beam must never be lower than second staffline
* centre beam symbol
* less hairy code
* redo grouping
- * (future) knee: ([\stem 1; c8 \stem -1; c8]
*/
#include <math.h>
#include "p-col.hh"
-#include "varray.hh"
+#include "array.hh"
#include "proto.hh"
-#include "dimen.hh"
+#include "dimensions.hh"
#include "beam.hh"
#include "abbreviation-beam.hh"
#include "misc.hh"
#include "paper-def.hh"
#include "lookup.hh"
#include "grouping.hh"
-#include "stem-info.hh"
-#include "main.hh" // experimental features
-
-
-IMPLEMENT_IS_TYPE_B1 (Beam, Spanner);
Beam::Beam ()
{
}
void
-Beam::add (Stem*s)
+Beam::add_stem (Stem*s)
{
stems_.push (s);
s->add_dependency (this);
}
Molecule*
-Beam::brew_molecule_p () const
+Beam::do_brew_molecule_p () const
{
Molecule *mol_p = new Molecule;
-
- Real interline_f = paper ()->interline_f ();
- Real internote_f = interline_f / 2;
- Real staffline_f = paper ()->rule_thickness ();
- Real beam_f = 0.48 * (interline_f - staffline_f);
+ Real internote_f = paper ()->internote_f ();
Real x0 = stems_[0]->hpos_f ();
for (int j=0; j <stems_.size (); j++)
Molecule sb = stem_beams (i, next, prev);
Real x = i->hpos_f ()-x0;
sb.translate (Offset (x, (x * slope_f_ + left_y_) * internote_f));
- mol_p->add (sb);
+ mol_p->add_molecule (sb);
}
mol_p->translate_axis (x0
- spanned_drul_[LEFT]->absolute_coordinate (X_AXIS), X_AXIS);
+ // correct if last note (and therefore reference point of beam)
+ // is on different staff
+ mol_p->translate_axis (- sinfo_.top ().interstaff_f_ * internote_f, Y_AXIS);
+
return mol_p;
}
Offset
Beam::center () const
{
- Real w= (paper ()->note_width () + width ().length ())/2.0;
+ Real w= (paper ()->note_width () + extent (X_AXIS).length ())/2.0;
return Offset (w, (left_y_ + w* slope_f_)*paper ()->internote_f ());
}
Beam::do_print () const
{
#ifndef NPRINT
- DOUT << "slope_f_ " <<slope_f_ << "left ypos " << left_y_;
+ DOUT << "slope_f_ " << slope_f_ << "left ypos " << left_y_;
Spanner::do_print ();
#endif
}
{
if (stems_.size () < 2)
{
- warning (_ ("Beam with less than 2 stems"));
+ warning (_ ("beam with less than two stems"));
transparent_b_ = true;
return ;
}
- solve_slope ();
+ calculate_slope ();
set_stemlens ();
}
void
-Beam::do_substitute_dependent (Score_elem*o,Score_elem*n)
+Beam::do_substitute_dependent (Score_element*o,Score_element*n)
{
- if (o->is_type_b (Stem::static_name ()))
- stems_.substitute ((Stem*)o->item (), n? (Stem*) n->item ():0);
+ if (Stem * os = dynamic_cast<Stem*> (o))
+ stems_.substitute (os,
+ dynamic_cast<Stem *> (n));
}
Interval
} while (flip(&d) != DOWN);
- do {
- if (!total[d])
- count[d] = 1;
- } while (flip(&d) != DOWN);
-
/*
-
[Ross] states that the majority of the notes dictates the
direction (and not the mean of "center distance")
+
+ But is that because it really looks better, or because he
+ wants to provide some real simple hands-on rules.
+
+ We have our doubts, so we simply provide all sensible alternatives.
*/
- dir_ = (total[UP] > total[DOWN]) ? UP : DOWN;
+
+ Dir_algorithm a = (Dir_algorithm)rint(paper ()->get_var ("beam_dir_algorithm"));
+ switch (a)
+ {
+ case MAJORITY:
+ dir_ = (count[UP] > count[DOWN]) ? UP : DOWN;
+ break;
+ case MEAN:
+ // mean centre distance
+ dir_ = (total[UP] > total[DOWN]) ? UP : DOWN;
+ break;
+ default:
+ case MEDIAN:
+ // median centre distance
+ if (!count[UP])
+ dir_ = DOWN;
+ else if (!count[DOWN])
+ dir_ = UP;
+ else
+ dir_ = (total[UP] / count[UP] > total[DOWN] / count[DOWN]) ? UP : DOWN;
+ break;
+ }
for (int i=0; i <stems_.size (); i++)
{
- Stem *sl = stems_[i];
- sl->dir_ = dir_;
+ Stem *s = stems_[i];
+ s->beam_dir_ = dir_;
+ if (!s->dir_forced_b_)
+ s->dir_ = dir_;
}
}
/*
See Documentation/tex/fonts.doc
*/
+
void
Beam::solve_slope ()
{
/*
should use minimum energy formulation (cf linespacing)
*/
+ assert (sinfo_.size () > 1);
+ DOUT << "Beam::solve_slope: \n";
+
+ Least_squares l;
+ for (int i=0; i < sinfo_.size (); i++)
+ {
+ l.input.push (Offset (sinfo_[i].x_, sinfo_[i].idealy_f_));
+ }
+ l.minimise (slope_f_, left_y_);
+}
+
+Real
+Beam::check_stemlengths_f (bool set_b)
+{
+ Real interbeam_f = paper ()->interbeam_f (multiple_i_);
+ Real internote_f = paper ()->internote_f ();
+ Real beam_f = paper ()->beam_thickness_f ();
+ Real staffline_f = paper ()->rule_thickness ();
+ Real epsilon_f = staffline_f / 8;
+ Real dy_f = 0.0;
+ for (int i=0; i < sinfo_.size (); i++)
+ {
+ Real y = sinfo_[i].x_ * slope_f_ + left_y_;
+ // correct for knee
+ if (dir_ != sinfo_[i].dir_)
+ {
+ y -= dir_ * (beam_f / 2
+ + (sinfo_[i].mult_i_ - 1) * interbeam_f) / internote_f;
+ if (!i && sinfo_[i].stem_l_->staff_sym_l_ !=
+ sinfo_.top ().stem_l_->staff_sym_l_)
+ y += dir_ * (multiple_i_ - (sinfo_[i].stem_l_->flag_i_ - 2) >? 0)
+ * interbeam_f / internote_f;
+ }
+
+ if (set_b)
+ sinfo_[i].stem_l_->set_stemend (y - sinfo_[i].interstaff_f_);
+
+ y *= dir_;
+ if (y > sinfo_[i].maxy_f_)
+ dy_f = dy_f <? sinfo_[i].maxy_f_ - y;
+ if (y < sinfo_[i].miny_f_)
+ {
+ // when all too short, normal stems win..
+ if (dy_f < -epsilon_f)
+ warning (_ ("weird beam shift, check your knees"));
+ dy_f = dy_f >? sinfo_[i].miny_f_ - y;
+ }
+ }
+ return dy_f;
+}
+
+void
+Beam::set_steminfo ()
+{
assert (multiple_i_);
- Array<Stem_info> sinfo;
- for (int j=0; j <stems_.size (); j++)
+ int total_count_i = 0;
+ int forced_count_i = 0;
+ for (int i=0; i < stems_.size (); i++)
{
- Stem *i = stems_[j];
+ Stem *s = stems_[i];
+ s->mult_i_ = multiple_i_;
+ s->set_default_extents ();
+ if (s->invisible_b ())
+ continue;
+ if (((int)s->chord_start_f ()) && (s->dir_ != s->get_default_dir ()))
+ forced_count_i++;
+ total_count_i++;
+ }
- i->mult_i_ = multiple_i_;
- i->set_default_extents ();
- if (i->invisible_b ())
+ Real internote_f = paper ()->internote_f ();
+ int stem_max = (int)rint(paper ()->get_var ("stem_max"));
+ Real shorten_f = paper ()->get_var (String ("forced_stem_shorten"
+ + to_str (multiple_i_ <? stem_max)))
+ / internote_f;
+
+ Real leftx = 0;
+ for (int i=0; i < stems_.size (); i++)
+ {
+ Stem *s = stems_[i];
+ if (s->invisible_b ())
continue;
- Stem_info info (i);
- sinfo.push (info);
+ Stem_info info (s);
+ if (leftx == 0)
+ leftx = info.x_;
+ info.x_ -= leftx;
+ if (info.dir_ == dir_)
+ {
+ if (forced_count_i == total_count_i)
+ info.idealy_f_ -= shorten_f;
+ else if (forced_count_i > total_count_i / 2)
+ info.idealy_f_ -= shorten_f / 2;
+ }
+ sinfo_.push (info);
}
- if (! sinfo.size ())
+}
+
+void
+Beam::calculate_slope ()
+{
+ set_steminfo ();
+ if (!sinfo_.size ())
slope_f_ = left_y_ = 0;
- else if (sinfo.size () == 1)
+ else if (sinfo_[0].idealy_f_ == sinfo_.top ().idealy_f_)
{
slope_f_ = 0;
- left_y_ = sinfo[0].idealy_f_;
+ left_y_ = sinfo_[0].idealy_f_;
+ left_y_ *= dir_;
}
else
{
-
- Real leftx = sinfo[0].x_;
- Least_squares l;
- for (int i=0; i < sinfo.size (); i++)
+ solve_slope ();
+ Real solved_slope_f = slope_f_;
+
+ /*
+ steep slope running against lengthened stem is suspect
+ */
+ Real dx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
+
+ // urg, these y internote-y-dimensions
+ Real internote_f = paper ()->internote_f ();
+ Real lengthened = paper ()->get_var ("beam_lengthened") / internote_f;
+ Real steep = paper ()->get_var ("beam_steep_slope") / internote_f;
+ if (((left_y_ - sinfo_[0].idealy_f_ > lengthened)
+ && (slope_f_ > steep))
+ || ((left_y_ + slope_f_ * dx_f - sinfo_.top ().idealy_f_ > lengthened)
+ && (slope_f_ < -steep)))
{
- sinfo[i].x_ -= leftx;
- l.input.push (Offset (sinfo[i].x_, sinfo[i].idealy_f_));
+ slope_f_ = 0;
}
- l.minimise (slope_f_, left_y_);
+ /*
+ This neat trick is by Werner Lemberg,
+ damped = tanh (slope_f_)
+ corresponds with some tables in [Wanske]
+ */
+ if (damping_i_)
+ slope_f_ = 0.6 * tanh (slope_f_) / damping_i_;
+
+ quantise_dy ();
+
+ Real damped_slope_dy_f = (solved_slope_f - slope_f_) * dx_f / 2;
+ left_y_ += damped_slope_dy_f;
+
+ left_y_ *= dir_;
+ slope_f_ *= dir_;
}
-
- Real dy = 0.0;
- for (int i=0; i < sinfo.size (); i++)
- {
- Real y = sinfo[i].x_ * slope_f_ + left_y_;
- Real my = sinfo[i].miny_f_;
-
- if (my - y > dy)
- dy = my -y;
- }
- left_y_ += dy;
- left_y_ *= dir_;
-
- slope_f_ *= dir_;
-
- /*
- This neat trick is by Werner Lemberg, damped = tanh (slope_f_) corresponds
- with some tables in [Wanske]
- */
- if (damping_i_)
- slope_f_ = 0.6 * tanh (slope_f_) / damping_i_;
-
- quantise_dy ();
-
- Real sl = slope_f_ * paper ()->internote_f ();
- paper ()->lookup_l ()->beam (sl, 20 PT, 1 PT);
- slope_f_ = sl / paper ()->internote_f ();
}
void
Real interline_f = paper ()->interline_f ();
Real internote_f = interline_f / 2;
Real staffline_f = paper ()->rule_thickness ();
- Real beam_f = 0.48 * (interline_f - staffline_f);
+ Real beam_f = paper ()->beam_thickness_f ();
Real dx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
allowed_fraction[2] = (beam_f + staffline_f);
- Interval iv = quantise_iv (allowed_fraction, interline_f, dy_f);
- quanty_f = (dy_f - iv.min () <= iv.max () - dy_f)
- ? iv.min ()
- : iv.max ();
+ Interval iv = quantise_iv (allowed_fraction, interline_f, dy_f);
+ quanty_f = (dy_f - iv.min () <= iv.max () - dy_f)
+ ? iv.min ()
+ : iv.max ();
slope_f_ = (quanty_f / dx_f) / internote_f * sign (slope_f_);
hang straddle sit inter hang
*/
- Real interbeam_f = paper ()->interbeam_f ();
Real interline_f = paper ()->interline_f ();
- Real internote_f = interline_f / 2;
+ Real internote_f = paper ()->internote_f ();
Real staffline_f = paper ()->rule_thickness ();
- Real beam_f = 0.48 * (interline_f - staffline_f);
- Real symbol_f = beam_f + interbeam_f * (multiple_i_ - 1);
+ Real beam_f = paper ()->beam_thickness_f ();
+
+ /*
+ [TODO]
+ it would be nice to have all allowed positions in a runtime matrix:
+ (multiplicity, minimum_beam_dy, maximum_beam_dy)
+ */
Real straddle = 0;
Real sit = beam_f / 2 - staffline_f / 2;
// dim(left_y_) = internote
Real dy_f = dir_ * left_y_ * internote_f;
+ Real beamdx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
+ Real beamdy_f = beamdx_f * slope_f_ * internote_f;
+
Array<Real> allowed_position;
if (quantisation_ != TEST)
{
if (quantisation_ <= NORMAL)
{
- if ((multiple_i_ <= 2) || (abs (dy_f) >= staffline_f / 2))
+ if ((multiple_i_ <= 2) || (abs (beamdy_f) >= staffline_f / 2))
allowed_position.push (straddle);
- if ((multiple_i_ <= 1) || (abs (dy_f) >= staffline_f / 2))
+ if ((multiple_i_ <= 1) || (abs (beamdy_f) >= staffline_f / 2))
allowed_position.push (sit);
allowed_position.push (hang);
}
else
// TODO: check and fix TRADITIONAL
{
- if ((multiple_i_ <= 2) || (abs (dy_f) >= staffline_f / 2))
+ if ((multiple_i_ <= 2) || (abs (beamdy_f) >= staffline_f / 2))
allowed_position.push (straddle);
- if ((multiple_i_ <= 1) && (dy_f <= staffline_f / 2))
+ if ((multiple_i_ <= 1) && (beamdy_f <= staffline_f / 2))
allowed_position.push (sit);
- if (dy_f >= -staffline_f / 2)
+ if (beamdy_f >= -staffline_f / 2)
allowed_position.push (hang);
}
}
if (test_pos == 0)
{
allowed_position.push (hang);
- cout << "hang" << hang << endl;
+ cout << "hang" << hang << "\n";
}
else if (test_pos==1)
{
}
}
-#if 0
- // this currently never happens
- Real q = (dy_f / interline_f - dy_i) * interline_f;
- if ((quantisation_ < NORMAL) && (q < interline_f / 3 - beam_f / 2))
- allowed_position.push (inter);
-#endif
-
Interval iv = quantise_iv (allowed_position, interline_f, dy_f);
Real quanty_f = dy_f - iv.min () <= iv.max () - dy_f ? iv.min () : iv.max ();
void
Beam::set_stemlens ()
{
- Real interbeam_f = paper ()->interbeam_f ();
- Real interline_f = paper ()->interline_f ();
- Real internote_f = interline_f / 2;
Real staffline_f = paper ()->rule_thickness ();
- Real beam_f = 0.48 * (interline_f - staffline_f);
+ // enge floots
+ Real epsilon_f = staffline_f / 8;
- /*
- if we have more than three beams they must open-up
- in order to not collide with staff lines
- */
- if (multiple_i_ > 3)
- interbeam_f += 2.0 * staffline_f / 4;
-
- Real x0 = stems_[0]->hpos_f ();
- Real dy = 0;
- // ugh, rounding problems! (enge floots)
- Real epsilon = staffline_f / 8;
- do
+ DOUT << "Beam::set_stemlens: \n";
+ Real dy_f = check_stemlengths_f (false);
+ for (int i = 0; i < 2; i++)
{
- left_y_ += dy * dir_;
- quantise_left_y (dy);
- dy = 0;
- for (int i=0; i < stems_.size (); i++)
- {
- Stem *s = stems_[i];
- if (s->transparent_b_)
- continue;
-
- Real x = s->hpos_f () - x0;
- s->set_stemend (left_y_ + slope_f_ * x);
- Real y = s->stem_end_f () * dir_;
- Stem_info info (s);
- if (y < info.miny_f_)
- dy = dy >? info.miny_f_ - y;
+ left_y_ += dy_f * dir_;
+ quantise_left_y (dy_f);
+ dy_f = check_stemlengths_f (true);
+ if (abs (dy_f) <= epsilon_f)
+ {
+ DOUT << "Beam::set_stemlens: " << i << " iterations\n";
+ break;
}
- } while (abs (dy) > epsilon);
-
- // ugh asymmetric symbol ?
- if (dir_ == UP)
- left_y_ -= dir_ * staffline_f / 4;
-
- if ((multiple_i_ >= 3) && (dir_ == UP))
- left_y_ -= dir_ * staffline_f / 4;
+ }
test_pos++;
test_pos %= 4;
assert (stems_.size () == b.size ()/2);
}
- for (int j=0, i=0; i < b.size () && j <stems_.size (); i+= 2, j++)
+ for (int j=0, i=0; i < b.size () && j <stems_.size (); j++)
{
Stem *s = stems_[j];
- s->beams_left_i_ = b[i];
- s->beams_right_i_ = b[i+1];
- multiple_i_ = multiple_i_ >? (b[i] >? b[i+1]);
+ Direction d = LEFT;
+ do {
+ if (s->beams_i_drul_[d] < 0)
+ s->beams_i_drul_[d] = b[i];
+
+ multiple_i_ = multiple_i_ >? s->beams_i_drul_[d];
+ i++;
+ } while ((flip (&d)) != LEFT);
}
}
assert (!prev || prev->hpos_f () < here->hpos_f ());
Real staffline_f = paper ()->rule_thickness ();
- Real interbeam_f = paper ()->interbeam_f ();
- Real internote_f =paper ()->internote_f ();
- Real interline_f = 2 * internote_f;
- Real beamheight_f = 0.48 * (interline_f - staffline_f);
+ Real interbeam_f = paper ()->interbeam_f (multiple_i_);
+ Real internote_f = paper ()->internote_f ();
+ Real beam_f = paper ()->beam_thickness_f ();
- if (multiple_i_ > 3)
- interbeam_f += 2.0 * staffline_f / 4;
Real dy = interbeam_f;
Real stemdx = staffline_f;
Real sl = slope_f_* internote_f;
- paper ()->lookup_l ()->beam (sl, 20 PT, 1 PT);
+ lookup_l ()->beam (sl, 20 PT, 1 PT);
Molecule leftbeams;
Molecule rightbeams;
+ // UGH
+ Real nw_f = paper ()->note_width () * 0.8;
+
/* half beams extending to the left. */
if (prev)
{
- int lhalfs= lhalfs = here->beams_left_i_ - prev->beams_right_i_ ;
- int lwholebeams= here->beams_left_i_ <? prev->beams_right_i_ ;
- Real w = (here->hpos_f () - prev->hpos_f ())/4 <? paper ()->note_width ();;
+ int lhalfs= lhalfs = here->beams_i_drul_[LEFT] - prev->beams_i_drul_[RIGHT] ;
+ int lwholebeams= here->beams_i_drul_[LEFT] <? prev->beams_i_drul_[RIGHT] ;
+ /*
+ Half beam should be one note-width,
+ but let's make sure two half-beams never touch
+ */
+ Real w = here->hpos_f () - prev->hpos_f ();
+ w = w/2 <? nw_f;
Atom a;
if (lhalfs) // generates warnings if not
- a = paper ()->lookup_l ()->beam (sl, w, beamheight_f);
+ a = lookup_l ()->beam (sl, w, beam_f);
a.translate (Offset (-w, -w * sl));
for (int j = 0; j < lhalfs; j++)
{
Atom b (a);
b.translate_axis (-dir_ * dy * (lwholebeams+j), Y_AXIS);
- leftbeams.add (b);
+ leftbeams.add_atom (b);
}
}
if (next)
{
- int rhalfs = here->beams_right_i_ - next->beams_left_i_;
- int rwholebeams = here->beams_right_i_ <? next->beams_left_i_;
+ int rhalfs = here->beams_i_drul_[RIGHT] - next->beams_i_drul_[LEFT];
+ int rwholebeams = here->beams_i_drul_[RIGHT] <? next->beams_i_drul_[LEFT];
Real w = next->hpos_f () - here->hpos_f ();
- Atom a = paper ()->lookup_l ()->beam (sl, w + stemdx, beamheight_f);
+ Atom a = lookup_l ()->beam (sl, w + stemdx, beam_f);
a.translate_axis( - stemdx/2, X_AXIS);
int j = 0;
Real gap_f = 0;
{
Atom b (a);
b.translate_axis (-dir_ * dy * j, Y_AXIS);
- rightbeams.add (b);
+ rightbeams.add_atom (b);
}
// TODO: notehead widths differ for different types
- gap_f = paper ()->note_width () / 2;
+ gap_f = nw_f / 2;
w -= 2 * gap_f;
- a = paper ()->lookup_l ()->beam (sl, w + stemdx, beamheight_f);
+ a = lookup_l ()->beam (sl, w + stemdx, beam_f);
}
for (; j < rwholebeams; j++)
{
Atom b (a);
b.translate (Offset (gap_f, -dir_ * dy * j));
- rightbeams.add (b);
+ rightbeams.add_atom (b);
}
- w = w/4 <? paper ()->note_width ();
+ w = w/2 <? nw_f;
if (rhalfs)
- a = paper ()->lookup_l ()->beam (sl, w, beamheight_f);
+ a = lookup_l ()->beam (sl, w, beam_f);
for (; j < rwholebeams + rhalfs; j++)
{
Atom b (a);
b.translate_axis (-dir_ * dy * j, Y_AXIS);
- rightbeams.add (b);
+ rightbeams.add_atom (b);
}
}
- leftbeams.add (rightbeams);
+ leftbeams.add_molecule (rightbeams);
/*
Does beam quanting think of the asymetry of beams?
projects / lilypond.git / blobdiff