/*
beam.cc -- implement Beam
- source file of the GNU GNU LilyPond music typesetter
+ source file of the GNU LilyPond music typesetter
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
- TODO
-
- Less hairy code. Better slope calculations.
- knee: ([\stem 1; c8 \stem -1; c8]
-
*/
-#include "varray.hh"
+/*
+ [TODO]
+ * center beam symbol
+ * less hairy code
+ * redo grouping
+
+TODO:
+
+The relationship Stem <-> Beam is way too hairy. Let's figure who
+needs what, and what information should be available when.
+
+ */
+
+#include <math.h>
+
+#include "beaming.hh"
#include "proto.hh"
-#include "dimen.hh"
+#include "dimensions.hh"
#include "beam.hh"
#include "misc.hh"
#include "debug.hh"
-#include "symbol.hh"
#include "molecule.hh"
#include "leastsquares.hh"
-#include "p-col.hh"
#include "stem.hh"
#include "paper-def.hh"
#include "lookup.hh"
-#include "grouping.hh"
-
+#include "group-interface.hh"
+Beam::Beam ()
+{
+ Group_interface g (this, "stems");
+ g.set_interface ();
+
+ slope_f_ = 0;
+ left_y_ = 0;
+ multiplicity_i_ = 0;
+}
-struct Stem_info {
- Real x;
- Real idealy;
- Real miny;
- int no_beams;
+/*
+ TODO: Fix this class. This is wildly inefficient.
+ */
+Stem *
+Beam::stem (int i)const
+{
+ return Group_interface__extract_elements ((Beam*) this, (Stem*) 0, "stems")[i];
+}
-
- Stem_info(){}
- Stem_info(Stem const *);
-};
+int
+Beam::stem_count ()const
+{
+ Group_interface gi (this, "stems");
+ return gi.count ();
+}
-Stem_info::Stem_info(Stem const *s)
+Stem*
+Beam::stem_top ()const
{
- x = s->hpos_f();
- int dir = s->dir_i_;
- idealy = dir * s->stem_end_f();
- miny = dir * s->stem_start_f() + 2; // ugh
- assert(miny <= idealy);
+ return Group_interface__extract_elements ((Beam*) this, (Stem*) 0, "stems")[stem_count () - 1];
}
-/* *************** */
void
-Beam::do_break_at(PCol*l, PCol*r)
+Beam::add_stem (Stem*s)
{
- assert (l->line_l_ == r->line_l_);
+ Group_interface gi (this, "stems");
+ gi.add_element (s);
+
+ s->add_dependency (this);
+
+ assert (!s->beam_l ());
+ s->set_elt_property ("beam", self_scm_);
+
+ if (!spanned_drul_[LEFT])
+ set_bounds (LEFT,s);
+ else
+ set_bounds (RIGHT,s);
}
+Molecule*
+Beam::do_brew_molecule_p () const
+{
+ Molecule *mol_p = new Molecule;
+ if (!stem_count ())
+ return mol_p;
+
+ Real x0 = stem (0)->hpos_f ();
+ for (int j=0; j <stem_count (); j++)
+ {
+ Stem *i = stem (j);
+ Stem * prev = (j > 0)? stem (j-1) : 0;
+ Stem * next = (j < stem_count ()-1) ? stem (j+1) :0;
+
+ Molecule sb = stem_beams (i, next, prev);
+ Real x = i->hpos_f ()-x0;
+ sb.translate (Offset (x, x * slope_f_ + left_y_));
+ mol_p->add_molecule (sb);
+ }
+ mol_p->translate_axis (x0
+ - spanned_drul_[LEFT]->relative_coordinate (0, X_AXIS), X_AXIS);
+ return mol_p;
+}
Offset
-Beam::center()const
+Beam::center () const
{
- Real w=(paper()->note_width() + width().length())/2.0;
- return Offset(w, (left_pos + w* slope)*paper()->internote_f());
+ Real w = (stem (0)->note_delta_f () + extent (X_AXIS).length ())/2.0;
+ return Offset (w, w * slope_f_);
}
+/*
+ Simplistic auto-knees; only consider vertical gap between two
+ adjacent chords
+ */
+bool
+Beam::auto_knee (SCM gap, bool interstaff_b)
+{
+ bool knee = false;
+ int knee_y = 0;
+ if (gap != SCM_UNDEFINED)
+ {
+ int auto_gap_i = gh_scm2int (gap);
+ for (int i=1; i < stem_count (); i++)
+ {
+ bool is_b = (bool)(stem (i)->get_real ("interstaff-f") - stem (i-1)->get_real ("interstaff-f"));
+ int l_y = (int)(stem (i-1)->chord_start_f ())
+ + (int)stem (i-1)->get_real ("interstaff-f");
+ int r_y = (int)(stem (i)->chord_start_f ())
+ + (int)stem (i)->get_real ("interstaff-f");
+ int gap_i = r_y - l_y;
+
+ /*
+ Forced stem directions are ignored. If you don't want auto-knees,
+ don't set, or unset autoKneeGap/autoInterstaffKneeGap.
+ */
+ if ((abs (gap_i) >= auto_gap_i) && (!interstaff_b || is_b))
+ {
+ knee_y = (r_y + l_y) / 2;
+ knee = true;
+ break;
+ }
+ }
+ }
+ if (knee)
+ {
+ for (int i=0; i < stem_count (); i++)
+ {
+ int y = (int)(stem (i)->chord_start_f ())
+ + (int)stem (i)->get_real ("interstaff-f");
+ stem (i)->set_direction ( y < knee_y ? UP : DOWN);
+ stem (i)->set_elt_property ("dir-forced", SCM_BOOL_T);
+ }
+ }
+ return knee;
+}
+
+bool
+Beam::auto_knees ()
+{
+ if (auto_knee (get_elt_property ("auto-interstaff-knee-gap"), true))
+ return true;
+
+ return auto_knee (get_elt_property ("auto-knee-gap"), false);
+}
-Beam::Beam()
+
+void
+Beam::do_pre_processing ()
{
- slope = 0;
- left_pos = 0.0;
+ /*
+ urg: it seems that info on whether beam (voice) dir was forced
+ is being junked here?
+ */
+ if (!get_direction ())
+ set_direction ( get_default_dir ());
+
+ set_direction (get_direction ());
}
void
-Beam::add(Stem*s)
+Beam::do_print () const
{
- stems.push(s);
- s->add_dependency(this);
- s->print_flag_b_ = false;
+#ifndef NPRINT
+ DEBUG_OUT << "slope_f_ " << slope_f_ << "left ypos " << left_y_;
+ Spanner::do_print ();
+#endif
}
void
-Beam::set_default_dir()
+Beam::do_post_processing ()
{
- int dirs_single = 0, dirs_chord = 0;
- for (int i=0; i <stems.size(); i++) {
- Stem *sl = stems[i];
- if (sl->chord_b())
- dirs_chord += sl->get_default_dir();
- else
- dirs_single += sl->get_center_distance();
+ if (stem_count () < 2)
+ {
+ warning (_ ("beam with less than two stems"));
+ set_elt_property ("transparent", SCM_BOOL_T);
+ return;
+ }
+ beamify_stems ();
+ if (auto_knees ())
+ {
+ /*
+ if auto-knee did its work, most probably stem directions
+ have changed, so we must recalculate all.
+ */
+ set_direction (get_default_dir ());
+ set_direction (get_direction ());
+
+ /* auto-knees used to only work for slope = 0
+ anyway, should be able to set slope per beam
+ set_elt_property ("damping", gh_int2scm(1000));
+ */
+
+ beamify_stems ();
+ }
+ calculate_slope ();
+ set_stemlens ();
+}
+
+
+#if 0
+Interval
+Beam::do_width () const
+{
+ return Interval (stem (0)->hpos_f (),
+ stems_.top ()->hpos_f ());
+}
+#endif
+
+Direction
+Beam::get_default_dir () const
+{
+ Drul_array<int> total;
+ total[UP] = total[DOWN] = 0;
+ Drul_array<int> count;
+ count[UP] = count[DOWN] = 0;
+ Direction d = DOWN;
+
+ for (int i=0; i <stem_count (); i++)
+ do {
+ Stem *s = stem (i);
+ int current = s->get_direction ()
+ ? (1 + d * s->get_direction ())/2
+ : s->get_center_distance ((Direction)-d);
+
+ if (current)
+ {
+ total[d] += current;
+ count[d] ++;
+ }
+
+ } 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.
+
+ If dir is not determined: up (see stem::get_default_dir ()) */
+
+ Direction beam_dir = CENTER;
+ Direction neutral_dir = (Direction)(int)paper_l ()->get_var ("stem_default_neutral_direction");
+
+ SCM a = get_elt_property ("beam-dir-algorithm");
+
+ if (a == ly_symbol2scm ("majority")) // should get default from paper.
+ beam_dir = (count[UP] == count[DOWN]) ? neutral_dir
+ : (count[UP] > count[DOWN]) ? UP : DOWN;
+ else if (a == ly_symbol2scm ("mean"))
+ // mean center distance
+ beam_dir = (total[UP] == total[DOWN]) ? neutral_dir
+ : (total[UP] > total[DOWN]) ? UP : DOWN;
+ else if (a == ly_symbol2scm ("median"))
+ {
+ // median center distance
+ if (count[DOWN] && count[UP])
+ {
+ beam_dir = (total[UP] / count[UP] == total[DOWN] / count[DOWN])
+ ? neutral_dir
+ : (total[UP] / count[UP] > total[DOWN] / count[DOWN]) ? UP : DOWN;
+ }
+ else
+ {
+ beam_dir = (count[UP] == count[DOWN]) ? neutral_dir
+ : (count[UP] > count[DOWN]) ? UP : DOWN;
+ }
}
- dirs_single = -sign(dirs_single);
- dir_i_ = (dirs_single + dirs_chord > 0) ? 1 : -1;
+
+ return beam_dir;
+}
- for (int i=0; i <stems.size(); i++) {
- Stem *sl = stems[i];
- sl->dir_i_ = dir_i_;
- }
+void
+Beam::set_direction (Direction d)
+{
+ Directional_spanner::set_direction (d);
+ for (int i=0; i <stem_count (); i++)
+ {
+ Stem *s = stem (i);
+ s->set_elt_property ("beam-dir", gh_int2scm (d));
+
+ SCM force = s->remove_elt_property ("dir-forced");
+ if (force == SCM_UNDEFINED)
+ s->set_direction ( d);
+ }
}
/*
- should use minimum energy formulation (cf linespacing)
- */
+ See Documentation/tex/fonts.doc
+ */
+
void
-Beam::solve_slope()
+Beam::solve_slope ()
{
- Array<Stem_info> sinfo;
- for (int j=0; j <stems.size(); j++) {
- Stem *i = stems[j];
+ assert (stem_count () > 1);
- i->set_default_extents();
- if (i->invisible_b())
- continue;
+ Least_squares l;
+ Real x0 = stem (0)->hpos_f ();
+ for (int i=0; i < stem_count (); i++)
+ {
+ l.input.push (Offset (stem (i)->hpos_f () - x0,
+ stem (i)->get_real ("idealy-f")));
+ }
+ l.minimise (slope_f_, left_y_);
+}
+
+/*
+ ugh. Naming: this doesn't check, but sets as well.
+ */
+
+Real
+Beam::check_stemlengths_f (bool set_b)
+{
+ Real interbeam_f = paper_l ()->interbeam_f (multiplicity_i_);
+
+ Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));
+ Real staffline_f = paper_l ()-> get_var ("stafflinethickness");
+ Real epsilon_f = staffline_f / 8;
+ Real dy_f = 0.0;
+ Real x0 = stem (0)->hpos_f ();
+ Real internote_f = paper_l ()->get_var ("interline");
+ for (int i=0; i < stem_count (); i++)
+ {
+ Real y = (stem (i)->hpos_f () - x0) * slope_f_ + left_y_;
+
+ // correct for knee
+ if (get_direction () != stem (i)->get_direction ())
+ {
+ y -= get_direction () * (beam_f / 2
+ + (multiplicity_i_ - 1) * interbeam_f);
+ if (!i
+ && stem (i)->staff_symbol_l () != stem_top ()->staff_symbol_l ())
+ y += get_direction () * (multiplicity_i_ - (stem (i)->flag_i_ - 2) >? 0)
+ * interbeam_f;
+ }
+
+ /* caution: stem measures in staff-positions */
+ if (set_b)
+ stem (i)->set_stemend ((y - stem (i)->get_real ("interstaff-f"))
+ / internote_f);
- Stem_info info(i);
- sinfo.push(info);
+ y *= get_direction ();
+ if (y > stem (i)->get_real ("maxy-f"))
+ dy_f = dy_f <? stem (i)->get_real ("maxy-f") - y;
+ if (y < stem (i)->get_real ("miny-f"))
+ {
+ // when all too short, normal stems win..
+ if (dy_f < -epsilon_f)
+ warning (_ ("weird beam vertical offset"));
+ dy_f = dy_f >? stem (i)->get_real ("miny-f") - y;
+ }
}
- Real leftx = sinfo[0].x;
- Least_squares l;
- for (int i=0; i < sinfo.size(); i++) {
- sinfo[i].x -= leftx;
- l.input.push(Offset(sinfo[i].x, sinfo[i].idealy));
+ return dy_f;
+}
+
+void
+Beam::beamify_stems ()
+{
+ if(!stem_count ())
+ return;
+
+ assert (multiplicity_i_);
+
+ int total_count_i = 0;
+ int forced_count_i = 0;
+ for (int i=0; i < stem_count (); i++)
+ {
+ Stem *s = stem (i);
+
+ s->set_default_extents ();
+ if (s->invisible_b ())
+ continue;
+ if (((int)s->chord_start_f ()) && (s->get_direction () != s->get_default_dir ()))
+ forced_count_i++;
+ total_count_i++;
}
- l.minimise(slope, left_pos);
- Real dy = 0.0;
- for (int i=0; i < sinfo.size(); i++) {
- Real y = sinfo[i].x * slope + left_pos;
- Real my = sinfo[i].miny;
+ Real internote_f = paper_l ()->get_var ("interline");
+ bool grace_b = get_elt_property ("grace") == SCM_BOOL_T;
+ String type_str = grace_b ? "grace_" : "";
+ int stem_max = (int)rint(paper_l ()->get_var ("stem_max"));
+ Real shorten_f = paper_l ()->get_var (type_str + "forced_stem_shorten"
+ + to_str (multiplicity_i_ <? stem_max)) * internote_f;
+
+ for (int i=0; i < stem_count (); i++)
+ {
+ Stem *s = stem (i);
+ /*
+ Chord tremolo needs to beam over invisible stems of wholes
+ */
+ SCM trem = get_elt_property ("chord-tremolo");
+ if (gh_boolean_p (trem) && gh_scm2bool (trem))
+ {
+ if (s->invisible_b ())
+ continue;
+ }
- if (my - y > dy)
- dy = my -y;
+ s->beamify ();
+ if (s->get_direction () == get_direction ())
+ {
+ if (forced_count_i == total_count_i)
+ s->set_real ("idealy-f", s->get_real ("idealy-f") - shorten_f);
+ else if (forced_count_i > total_count_i / 2)
+ s->set_real ("idealy-f", s->get_real ("idealy-f") - shorten_f/2);
+ }
}
- left_pos += dy;
- left_pos *= dir_i_;
- slope *= dir_i_;
-
- // ugh
- Real sl = slope*paper()->internote_f();
- paper()->lookup_l()->beam(sl, 20 PT);
- slope = sl /paper()->internote_f();
}
void
-Beam::set_stemlens()
+Beam::calculate_slope ()
{
- Real x0 = stems[0]->hpos_f();
- for (int j=0; j <stems.size(); j++) {
- Stem *s = stems[j];
+ if (!stem_count ())
+ slope_f_ = left_y_ = 0;
+ else if (stem (0)->get_real ("idealy-f") == stem_top ()->get_real ("idealy-f"))
+ {
+ slope_f_ = 0;
+ left_y_ = stem (0)->get_real ("idealy-f");
+ left_y_ *= get_direction ();
+ }
+ else
+ {
+ solve_slope ();
+ Real solved_slope_f = slope_f_;
+
+ /*
+ steep slope running against lengthened stem is suspect
+ */
+ Real dx_f = stem (stem_count () -1)->hpos_f () - stem (0)->hpos_f ();
+
+ Real lengthened = paper_l ()->get_var ("beam_lengthened");
+ Real steep = paper_l ()->get_var ("beam_steep_slope");
+ if (((left_y_ - stem (0)->get_real ("idealy-f") > lengthened)
+ && (slope_f_ > steep))
+ || ((left_y_ + slope_f_ * dx_f - stem_top ()->get_real ("idealy-f") > lengthened)
+ && (slope_f_ < -steep)))
+ {
+ slope_f_ = 0;
+ }
- Real x = s->hpos_f()-x0;
- s->set_stemend(left_pos + slope * x);
+ /*
+ This neat trick is by Werner Lemberg,
+ damped = tanh (slope_f_)
+ corresponds with some tables in [Wanske]
+ */
+ SCM damp = remove_elt_property ("damping");
+ int damping = 1; // ugh.
+ if (damp!= SCM_UNDEFINED)
+ damping = gh_int2scm (damp);
+
+ if (damping)
+ slope_f_ = 0.6 * tanh (slope_f_) / damping;
+
+ quantise_dy ();
+
+ Real damped_slope_dy_f = (solved_slope_f - slope_f_) * dx_f / 2;
+ left_y_ += damped_slope_dy_f;
+
+ left_y_ *= get_direction ();
+ slope_f_ *= get_direction ();
}
}
-
void
-Beam::do_post_processing()
+Beam::quantise_dy ()
{
- solve_slope();
- set_stemlens();
+ /*
+ [Ross] (simplification of)
+ Try to set slope_f_ complying with y-span of:
+ - zero
+ - beam_f / 2 + staffline_f / 2
+ - beam_f + staffline_f
+ + n * interline
+ */
+
+ SCM q = get_elt_property ("slope-quantisation");
+
+ if (q == ly_symbol2scm ("none"))
+ return;
+
+ Real interline_f = stem (0)->staff_line_leading_f ();
+ Real staffline_f = paper_l ()->get_var ("stafflinethickness");
+ Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));;
+
+ Real dx_f = stem (stem_count () -1 )->hpos_f () - stem (0)->hpos_f ();
+
+ Real dy_f = dx_f * abs (slope_f_);
+
+ Real quanty_f = 0.0;
+
+ Array<Real> allowed_fraction (3);
+ allowed_fraction[0] = 0;
+ allowed_fraction[1] = (beam_f / 2 + staffline_f / 2);
+ allowed_fraction[2] = (beam_f + staffline_f);
+
+ Interval iv = quantise_iv (allowed_fraction, interline_f, dy_f);
+ quanty_f = (dy_f - iv[SMALLER] <= iv[BIGGER] - dy_f)
+ ? iv[SMALLER]
+ : iv[BIGGER];
+
+ slope_f_ = (quanty_f / dx_f) * sign (slope_f_);
}
+/*
+
+ Prevent interference from stafflines and beams. See Documentation/tex/fonts.doc
+
+ */
void
-Beam::set_grouping(Rhythmic_grouping def, Rhythmic_grouping cur)
+Beam::quantise_left_y (bool extend_b)
{
- def.OK();
- cur.OK();
- assert(cur.children.size() == stems.size());
-
- cur.split(def);
+ /*
+ we only need to quantise the start of the beam as dy is quantised too
+ if extend_b then stems must *not* get shorter
+ */
+ SCM q = get_elt_property ("slope-quantisation");
+
+
+ /*
+ ----------------------------------------------------------
+ ########
+ ########
+ ########
+ --------------########------------------------------------
+ ########
+
+ hang straddle sit inter hang
+ */
+
+ Real space = stem (0)->staff_line_leading_f ();
+ Real staffline_f = paper_l ()->get_var ("stafflinethickness");
+ Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));;
+
+ /*
+ [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;
+ Real hang = space - beam_f / 2 + staffline_f / 2;
+
+ /*
+ Put all allowed positions into an array.
+ Whether a position is allowed or not depends on
+ strictness of quantisation, multiplicity and direction.
+
+ For simplicity, we'll assume dir = UP and correct if
+ dir = DOWN afterwards.
+ */
+ // isn't this asymmetric ? --hwn
+
+ Real dy_f = get_direction () * left_y_;
+
+ Real beamdx_f = stem (stem_count () -1)->hpos_f () - stem (0)->hpos_f ();
+ Real beamdy_f = beamdx_f * slope_f_;
- Array<int> b;
+ Array<Real> allowed_position;
+ if (q == ly_symbol2scm ("normal"))
{
- Array<int> flags;
- for (int j=0; j <stems.size(); j++) {
- Stem *s = stems[j];
+ if ((multiplicity_i_ <= 2) || (abs (beamdy_f) >= staffline_f / 2))
+ allowed_position.push (straddle);
+ if ((multiplicity_i_ <= 1) || (abs (beamdy_f) >= staffline_f / 2))
+ allowed_position.push (sit);
+ allowed_position.push (hang);
+ }
+ else if (q == ly_symbol2scm ("traditional"))
+ {
+ // TODO: check and fix TRADITIONAL
+ if ((multiplicity_i_ <= 2) || (abs (beamdy_f) >= staffline_f / 2))
+ allowed_position.push (straddle);
+ if ((multiplicity_i_ <= 1) && (beamdy_f <= staffline_f / 2))
+ allowed_position.push (sit);
+ if (beamdy_f >= -staffline_f / 2)
+ allowed_position.push (hang);
+ }
+
+
+ Interval iv = quantise_iv (allowed_position, space, dy_f);
- int f = intlog2(abs(s->flag_i_))-2;
- assert(f>0);
- flags.push(f);
+ Real quanty_f = dy_f - iv[SMALLER] <= iv[BIGGER] - dy_f ? iv[SMALLER] : iv[BIGGER];
+ if (extend_b)
+ quanty_f = iv[BIGGER];
+
+ left_y_ = get_direction () * quanty_f;
+}
+
+void
+Beam::set_stemlens ()
+{
+ Real staffline_f = paper_l ()->get_var ("stafflinethickness");
+ // enge floots
+ Real epsilon_f = staffline_f / 8;
+
+
+ // je bent zelf eng --hwn.
+ Real dy_f = check_stemlengths_f (false);
+ for (int i = 0; i < 2; i++) // 2 ?
+ {
+ left_y_ += dy_f * get_direction ();
+ quantise_left_y (dy_f);
+ dy_f = check_stemlengths_f (true);
+ if (abs (dy_f) <= epsilon_f)
+ {
+ break;
}
- int fi =0;
- b= cur.generate_beams(flags, fi);
- b.insert(0,0);
- b.push(0);
- assert(stems.size() == b.size()/2);
}
+}
- for (int j=0, i=0; i < b.size() && j <stems.size(); i+= 2, j++) {
- Stem *s = stems[j];
- s->beams_left_i_ = b[i];
- s->beams_right_i_ = b[i+1];
+void
+Beam::set_beaming (Beaming_info_list *beaming)
+{
+ Direction d = LEFT;
+ for (int i=0; i < stem_count (); i++)
+ {
+ do
+ {
+ if (stem (i)->beams_i_drul_[d] < 0)
+ stem (i)->beams_i_drul_[d] = beaming->infos_.elem (i).beams_i_drul_[d];
+ }
+ while (flip (&d) != LEFT);
}
}
+
void
-Beam::do_pre_processing()
+Beam::do_add_processing ()
{
- left_col_l_ = stems[0] ->pcol_l_;
- right_col_l_ = stems.top()->pcol_l_;
- assert(stems.size()>1);
- if (!dir_i_)
- set_default_dir();
+ for (int i=0; i < stem_count () ; i++)
+ {
+ Direction d = LEFT;
+ do {
+ multiplicity_i_ = multiplicity_i_ >? stem (i)->beams_i_drul_[d];
+ } while ((flip (&d)) != LEFT);
+ }
+ /*
+ Why?
+ */
+ if (stem_count ())
+ {
+ stem (0)->beams_i_drul_[LEFT] =0;
+ stem (stem_count () -1)->beams_i_drul_[RIGHT] =0;
+ }
}
-Interval
-Beam::do_width() const
-{
- return Interval( stems[0]->hpos_f(),
- stems.top()->hpos_f() );
-}
/*
beams to go with one stem.
+
+ clean me up.
*/
Molecule
-Beam::stem_beams(Stem *here, Stem *next, Stem *prev)const
+Beam::stem_beams (Stem *here, Stem *next, Stem *prev) const
{
- assert( !next || next->hpos_f() > here->hpos_f() );
- assert( !prev || prev->hpos_f() < here->hpos_f() );
- Real dy=paper()->internote_f()*2;
- Real stemdx = paper()->rule_thickness();
- Real sl = slope*paper()->internote_f();
- paper()->lookup_l()->beam(sl, 20 PT);
-
- Molecule leftbeams;
- Molecule rightbeams;
-
- /* 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;
- Symbol dummy;
- Atom a(dummy);
- if (lhalfs) // generates warnings if not
- a = paper()->lookup_l()->beam(sl, w);
- a.translate(Offset (-w, -w * sl));
- for (int j = 0; j < lhalfs; j++) {
- Atom b(a);
- b.translate(Offset(0, -dir_i_ * dy * (lwholebeams+j)));
- leftbeams.add( b );
+ if ((next && !(next->hpos_f () > here->hpos_f ())) ||
+ (prev && !(prev->hpos_f () < here->hpos_f ())))
+ programming_error ("Beams are not left-to-right");
+
+ Real staffline_f = paper_l ()->get_var ("stafflinethickness");
+ Real interbeam_f = paper_l ()->interbeam_f (multiplicity_i_);
+ Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));;
+
+ Real dy = interbeam_f;
+ Real stemdx = staffline_f;
+ Real sl = slope_f_;
+
+ Molecule leftbeams;
+ Molecule rightbeams;
+
+ // UGH
+ Real nw_f;
+ if (!here->first_head ())
+ nw_f = 0;
+ else if (here->type_i ()== 1)
+ nw_f = paper_l ()->get_var ("wholewidth");
+ else if (here->type_i () == 2)
+ nw_f = paper_l ()->get_var ("notewidth") * 0.8;
+ else
+ nw_f = paper_l ()->get_var ("quartwidth");
+
+ /* half beams extending to the left. */
+ if (prev)
+ {
+ 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;
+ Molecule a;
+ if (lhalfs) // generates warnings if not
+ a = lookup_l ()->beam (sl, w, beam_f);
+ a.translate (Offset (-w, -w * sl));
+ for (int j = 0; j < lhalfs; j++)
+ {
+ Molecule b (a);
+ b.translate_axis (-get_direction () * dy * (lwholebeams+j), Y_AXIS);
+ leftbeams.add_molecule (b);
}
}
-
- if (next){
- int rhalfs = here->beams_right_i_ - next->beams_left_i_;
- int rwholebeams = here->beams_right_i_ <? next->beams_left_i_;
- Real w = next->hpos_f() - here->hpos_f();
- Atom a = paper()->lookup_l()->beam(sl, w + stemdx);
-
- int j = 0;
- for (; j < rwholebeams; j++) {
- Atom b(a);
- b.translate(Offset(0, -dir_i_ * dy * j));
- rightbeams.add( b );
+ if (next)
+ {
+ 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 ();
+ Molecule a = lookup_l ()->beam (sl, w + stemdx, beam_f);
+ a.translate_axis( - stemdx/2, X_AXIS);
+ int j = 0;
+ Real gap_f = 0;
+
+ SCM gap = get_elt_property ("beam-gap");
+ if (gap != SCM_UNDEFINED)
+ {
+ int gap_i = gh_scm2int ( (gap));
+ int nogap = rwholebeams - gap_i;
+
+ for (; j < nogap; j++)
+ {
+ Molecule b (a);
+ b.translate_axis (-get_direction () * dy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
+ }
+ // TODO: notehead widths differ for different types
+ gap_f = nw_f / 2;
+ w -= 2 * gap_f;
+ a = lookup_l ()->beam (sl, w + stemdx, beam_f);
}
- w /= 4;
- if (rhalfs)
- a = paper()->lookup_l()->beam(sl, w);
-
- for (; j < rwholebeams + rhalfs; j++) {
- Atom b(a);
- b.translate(Offset(0, -dir_i_ * dy * j));
- rightbeams.add(b );
+ for (; j < rwholebeams; j++)
+ {
+ Molecule b (a);
+ if (!here->invisible_b ())
+ b.translate (Offset (gap_f, -get_direction () * dy * j));
+ else
+ b.translate (Offset (0, -get_direction () * dy * j));
+ rightbeams.add_molecule (b);
}
-
- }
- leftbeams.add(rightbeams);
- return leftbeams;
-}
+ w = w/2 <? nw_f;
+ if (rhalfs)
+ a = lookup_l ()->beam (sl, w, beam_f);
-Molecule*
-Beam::brew_molecule_p() const
-{
- Molecule *out=0;
- Real inter=paper()->internote_f();
- out = new Molecule;
- Real x0 = stems[0]->hpos_f();
- for (int j=0; j <stems.size(); j++) {
- Stem *i = stems[j];
- Stem * prev = (j > 0)? stems[j-1] : 0;
- Stem * next = (j < stems.size()-1) ? stems[j+1] :0;
-
- Molecule sb = stem_beams(i, next, prev);
- Real x = i->hpos_f()-x0;
- sb.translate(Offset(x, (x * slope + left_pos)* inter));
- out->add(sb);
- }
- out->translate(Offset(x0 - left_col_l_->hpos,0));
- return out;
-}
+ for (; j < rwholebeams + rhalfs; j++)
+ {
+ Molecule b (a);
+ b.translate_axis (-get_direction () * dy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
+ }
-IMPLEMENT_STATIC_NAME(Beam);
+ }
+ leftbeams.add_molecule (rightbeams);
-void
-Beam::do_print()const
-{
-#ifndef NPRINT
- mtor << "slope " <<slope << "left ypos " << left_pos;
- Spanner::print();
-#endif
+ /*
+ Does beam quanting think of the asymetry of beams?
+ Refpoint is on bottom of symbol. (FIXTHAT) --hwn.
+ */
+ return leftbeams;
}
-void
-Beam::do_substitute_dependency(Score_elem*o,Score_elem*n)
-{
- int i;
- while ((i=stems.find_i((Stem*)o->item())) >=0)
- if (n) stems[i] = (Stem*) n->item();
- else stems.del(i);
-}
+
projects / lilypond.git / blobdiff