source file of the GNU LilyPond music typesetter
- (c) 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
*/
-
/*
[TODO]
- * center beam symbol
- * less hairy code
- * redo grouping
-TODO:
+ * different left/right quanting: slope, multiplicity
+
+ * Fix TODO
+
+ * Junk stem_info.
+
+ * Remove #'direction from beam. A beam has no direction per se.
+ It may only set directions for stems.
-The relationship Stem <-> Beam is way too hairy. Let's figure who
-needs what, and what information should be available when.
+ * Rewrite stem_beams.
+
+ */
- */
-#include <math.h>
+#include <math.h> // tanh.
+#include "molecule.hh"
+#include "directional-element-interface.hh"
#include "beaming.hh"
-#include "proto.hh"
-#include "dimensions.hh"
#include "beam.hh"
#include "misc.hh"
-#include "debug.hh"
-#include "molecule.hh"
-#include "leastsquares.hh"
+#include "least-squares.hh"
#include "stem.hh"
#include "paper-def.hh"
#include "lookup.hh"
+#include "group-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "item.hh"
+#include "spanner.hh"
+#include "warn.hh"
+#include "text-item.hh" // debug output.
+#include "font-interface.hh" // debug output.
+
-Beam::Beam ()
+
+Real
+shrink_extra_weight(Real x)
{
- slope_f_ = 0;
- left_y_ = 0;
- multiple_i_ = 0;
+ return fabs(x) * ((x < 0) ? 1.5 : 1.0);
}
+
void
-Beam::add_stem (Stem*s)
+Beam::add_stem (Grob *me, Grob *s)
{
-#if 0
- /*
- should figure out why this didn't work.
-
- --hwn.
- */
- if (!stems_.size ())
- {
- set_parent (s, Y_AXIS);
- }
-#endif
- stems_.push (s);
- s->add_dependency (this);
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("stems"), s);
+
+ s->add_dependency (me);
- assert (!s->beam_l_);
- s->beam_l_ = this;
+ assert (!Stem::beam_l (s));
+ s->set_grob_property ("beam", me->self_scm ());
- if (!spanned_drul_[LEFT])
- set_bounds (LEFT,s);
- else
- set_bounds (RIGHT,s);
+ add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
}
-Stem_info
-Beam::get_stem_info (Stem *s)
+int
+Beam::get_multiplicity (Grob *me)
{
- Stem_info i;
- for (int i=0; i < sinfo_.size (); i++)
+ int m = 0;
+ for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
{
- if (sinfo_[i].stem_l_ == s)
- return sinfo_[i];
+ Grob *sc = unsmob_grob (ly_car (s));
+
+ if (Stem::has_interface (sc))
+ m = m >? Stem::beam_count (sc, LEFT) >? Stem::beam_count (sc, RIGHT);
}
- assert (false);
- return i;
+ return m;
}
-Molecule*
-Beam::do_brew_molecule_p () const
+/* After pre-processing all directions should be set.
+ Several post-processing routines (stem, slur, script) need stem/beam
+ direction.
+ Currenly, this means that beam has set all stem's directions.
+ [Alternatively, stems could set its own directions, according to
+ their beam, during 'final-pre-processing'.] */
+MAKE_SCHEME_CALLBACK (Beam, before_line_breaking, 1);
+SCM
+Beam::before_line_breaking (SCM smob)
{
- Molecule *mol_p = new Molecule;
- if (!sinfo_.size ())
- return mol_p;
-
- 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;
+ Grob *me = unsmob_grob (smob);
- Molecule sb = stem_beams (i, next, prev);
- Real x = i->hpos_f ()-x0;
- sb.translate (Offset (x, (x * slope_f_ + left_y_) *
- i->staff_line_leading_f ()/2 ));
- mol_p->add_molecule (sb);
- }
- mol_p->translate_axis (x0
- - spanned_drul_[LEFT]->relative_coordinate (0, X_AXIS), X_AXIS);
+ /* Beams with less than 2 two stems don't make much sense, but could happen
+ when you do
+
+ [r8 c8 r8].
+
+ For a beam that only has one stem, we try to do some disappearance magic:
+ we revert the flag, and move on to The Eternal Engraving Fields. */
- return mol_p;
-}
+ int count = visible_stem_count (me);
+ if (count < 2)
+ {
+ me->warning (_ ("beam has less than two visible stems"));
-Offset
-Beam::center () const
-{
- Stem_info si = sinfo_[0];
-
- Real w= (si.stem_l_->note_delta_f () + extent (X_AXIS).length ())/2.0;
- return Offset (w, ( w* slope_f_) *
- si.stem_l_->staff_line_leading_f ()/2);
-}
+ SCM stems = me->get_grob_property ("stems");
+ if (scm_ilength (stems) == 1)
+ {
+ me->warning (_ ("Beam has less than two stems. Removing beam."));
-/*
- 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;
- Real internote_f = stems_[0]->staff_line_leading_f ()/2;
- if (gap != SCM_UNDEFINED)
- {
- int auto_gap_i = gh_scm2int (gap);
- for (int i=1; i < stems_.size (); i++)
- {
- bool is_b = (bool)(sinfo_[i].interstaff_f_ - sinfo_[i-1].interstaff_f_);
- int l_y = (int)(stems_[i-1]->chord_start_f () / internote_f)
- + (int)sinfo_[i-1].interstaff_f_;
- int r_y = (int)(stems_[i]->chord_start_f () / internote_f)
- + (int)sinfo_[i].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;
- }
+ unsmob_grob (gh_car (stems))->remove_grob_property ("beam");
+ me->suicide ();
+
+ return SCM_UNSPECIFIED;
+ }
+ else if (scm_ilength (stems) == 0)
+ {
+ me->suicide ();
+ return SCM_UNSPECIFIED;
}
}
- if (knee)
+ if (count >= 1)
{
- for (int i=0; i < stems_.size (); i++)
- {
- int y = (int)(stems_[i]->chord_start_f () / internote_f)
- + (int)sinfo_[i].interstaff_f_;
- stems_[i]->dir_ = y < knee_y ? UP : DOWN;
- stems_[i]->set_elt_property ("dir-forced", SCM_BOOL_T);
- }
+ if (!Directional_element_interface::get (me))
+ Directional_element_interface::set (me, get_default_dir (me));
+
+ consider_auto_knees (me);
+ set_stem_directions (me);
+ set_stem_shorten (me);
}
- return knee;
+ return SCM_EOL;
}
-bool
-Beam::auto_knees ()
+Direction
+Beam::get_default_dir (Grob *me)
{
- if (auto_knee (get_elt_property ("auto-interstaff-knee-gap"), true))
- return true;
+ Drul_array<int> total;
+ total[UP] = total[DOWN] = 0;
+ Drul_array<int> count;
+ count[UP] = count[DOWN] = 0;
+ Direction d = DOWN;
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ for (int i=0; i <stems.size (); i++)
+ do {
+ Grob *s = stems[i];
+ Direction sd = Directional_element_interface::get (s);
+ int current = sd ? (1 + d * sd)/2
+ : Stem::get_center_distance (s, (Direction)-d);
+
+ if (current)
+ {
+ total[d] += current;
+ count[d] ++;
+ }
+ } while (flip (&d) != DOWN);
+
+ SCM func = me->get_grob_property ("dir-function");
+ SCM s = gh_call2 (func,
+ gh_cons (gh_int2scm (count[UP]),
+ gh_int2scm (count[DOWN])),
+ gh_cons (gh_int2scm (total[UP]),
+ gh_int2scm (total[DOWN])));
+
+ if (gh_number_p (s) && gh_scm2int (s))
+ return to_dir (s);
- return auto_knee (get_elt_property ("auto-knee-gap"), false);
+ /* If dir is not determined: get default */
+ return to_dir (me->get_grob_property ("neutral-direction"));
}
+/* Set all stems with non-forced direction to beam direction.
+ Urg: non-forced should become `without/with unforced' direction,
+ once stem gets cleaned-up. */
void
-Beam::do_pre_processing ()
+Beam::set_stem_directions (Grob *me)
{
- /*
- urg: it seems that info on whether beam (voice) dir was forced
- is being junked here?
- */
- if (!dir_)
- dir_ = get_default_dir ();
+ Link_array<Item> stems
+ =Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ Direction d = Directional_element_interface::get (me);
- set_direction (dir_);
-}
+ for (int i=0; i <stems.size (); i++)
+ {
+ Grob *s = stems[i];
+ SCM force = s->remove_grob_property ("dir-forced");
+ if (!gh_boolean_p (force) || !gh_scm2bool (force))
+ Directional_element_interface::set (s, d);
+ }
+}
-void
-Beam::do_print () const
-{
-#ifndef NPRINT
- DEBUG_OUT << "slope_f_ " << slope_f_ << "left ypos " << left_y_;
- Spanner::do_print ();
-#endif
-}
+/* Simplistic auto-knees; only consider vertical gap between two
+ adjacent chords.
+ `Forced' stem directions are ignored. If you don't want auto-knees,
+ don't set, or unset auto-knee-gap. */
void
-Beam::do_post_processing ()
+Beam::consider_auto_knees (Grob *me)
{
- if (stems_.size () < 2)
- {
- warning (_ ("beam with less than two stems"));
- set_elt_property ("transparent", SCM_BOOL_T);
- return;
- }
- set_steminfo ();
- if (auto_knees ())
+ SCM scm = me->get_grob_property ("auto-knee-gap");
+
+ if (gh_number_p (scm))
{
- /*
- if auto-knee did its work, most probably stem directions
- have changed, so we must recalculate all.
- */
- dir_ = get_default_dir ();
- set_direction (dir_);
+ bool knee_b = false;
+ Real knee_y = 0;
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real gap = gh_scm2double (scm) / staff_space;
+
+ Direction d = Directional_element_interface::get (me);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ Grob *common = me->common_refpoint (stems[0], Y_AXIS);
+ for (int i=1; i < stems.size (); i++)
+ if (!Stem::invisible_b (stems[i]))
+ common = common->common_refpoint (stems[i], Y_AXIS);
- /* 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));
- */
+ int l = 0;
+ for (int i=1; i < stems.size (); i++)
+ {
+ if (!Stem::invisible_b (stems[i-1]))
+ l = i - 1;
+ if (Stem::invisible_b (stems[l]))
+ continue;
+ if (Stem::invisible_b (stems[i]))
+ continue;
+
+ Real left = Stem::extremal_heads (stems[l])[d]
+ ->relative_coordinate (common, Y_AXIS);
+ Real right = Stem::extremal_heads (stems[i])[-d]
+ ->relative_coordinate (common, Y_AXIS);
+
+ Real dy = right - left;
- sinfo_.clear ();
- set_steminfo ();
+ if (abs (dy) >= gap)
+ {
+ knee_y = (right + left) / 2;
+ knee_b = true;
+ break;
+ }
+ }
+
+ if (knee_b)
+ {
+ for (int i=0; i < stems.size (); i++)
+ {
+ if (Stem::invisible_b (stems[i]))
+ continue;
+ Item *s = stems[i];
+ Real y = Stem::extremal_heads (stems[i])[d]
+ ->relative_coordinate (common, Y_AXIS);
+
+ Directional_element_interface::set (s, y < knee_y ? UP : DOWN);
+ s->set_grob_property ("dir-forced", SCM_BOOL_T);
+ }
+ }
}
- calculate_slope ();
- set_stemlens ();
}
+/* Set stem's shorten property if unset.
+ TODO:
+ take some y-position (chord/beam/nearest?) into account
+ scmify forced-fraction */
void
-Beam::do_substitute_element_pointer (Score_element*o,Score_element*n)
+Beam::set_stem_shorten (Grob *m)
{
- if (Stem * os = dynamic_cast<Stem*> (o))
- stems_.substitute (os,
- dynamic_cast<Stem *> (n));
+ Spanner*me = dynamic_cast<Spanner*> (m);
+
+ Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
+
+ int multiplicity = get_multiplicity (me);
+
+ SCM shorten = me->get_grob_property ("beamed-stem-shorten");
+ if (shorten == SCM_EOL)
+ return;
+
+ int sz = scm_ilength (shorten);
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ SCM shorten_elt = scm_list_ref (shorten,
+ gh_int2scm (multiplicity <? (sz - 1)));
+ Real shorten_f = gh_scm2double (shorten_elt) * staff_space;
+
+ /* your similar cute comment here */
+ shorten_f *= forced_fraction;
+
+ me->set_grob_property ("shorten", gh_double2scm (shorten_f));
}
-Interval
-Beam::do_width () const
+/* Call list of y-dy-callbacks, that handle setting of
+ grob-properties y, dy.
+
+ User may set grob-properties: y-position-hs and height-hs
+ (to be fixed) that override the calculated y and dy.
+
+ Because y and dy cannot be calculated and quanted separately, we
+ always calculate both, then check for user override. */
+MAKE_SCHEME_CALLBACK (Beam, after_line_breaking, 1);
+SCM
+Beam::after_line_breaking (SCM smob)
{
- return Interval (stems_[0]->hpos_f (),
- stems_.top ()->hpos_f ());
+ Grob *me = unsmob_grob (smob);
+
+ /* Copy to mutable list. */
+ SCM s = ly_deep_copy (me->get_grob_property ("positions"));
+ me->set_grob_property ("positions", s);
+
+ if (ly_car (s) != SCM_BOOL_F)
+ return SCM_UNSPECIFIED;
+
+ SCM callbacks = me->get_grob_property ("position-callbacks");
+ for (SCM i = callbacks; gh_pair_p (i); i = ly_cdr (i))
+ gh_call1 (ly_car (i), smob);
+
+ return SCM_UNSPECIFIED;
}
-Direction
-Beam::get_default_dir () const
+struct Quant_score
{
- 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 <stems_.size (); i++)
- do {
- Stem *s = stems_[i];
- int current = s->dir_
- ? (1 + d * s->dir_)/2
- : s->get_center_distance ((Direction)-d);
+ Real yl;
+ Real yr;
+ Real demerits;
+};
- 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")
+MAKE_SCHEME_CALLBACK (Beam, new_quanting, 1);
+SCM
+Beam::new_quanting (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
- 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.
+ SCM s = me->get_grob_property ("positions");
+ Real yl = gh_scm2double (gh_car(s));
+ Real yr = gh_scm2double (gh_cdr(s));
- If dir is not determined: up (see stem::get_default_dir ()) */
+ Real thick = gh_scm2double (me->get_grob_property ("thickness"));
+ // Staff_symbol_referencer::staff_space (me);
+ Real sthick = me->paper_l()->get_var ("stafflinethickness");
+ // * Staff_symbol_referencer::staff_space (me);
- Direction beam_dir = CENTER;
- Direction neutral_dir = (Direction)(int)paper_l ()->get_var ("stem_default_neutral_direction");
+ Real quants [] = {0.0, thick/2 - sthick / 2, 0.5, 1.0 - thick/2 + sthick/2};
+ int num_quants = int(sizeof(quants)/sizeof (Real));
+ Array<Real> quantsl;
+ Array<Real> quantsr;
- SCM a = get_elt_property ("beam-dir-algorithm");
+ const int REGION_SIZE = 3;
+
+ for (int i = -REGION_SIZE ; i < REGION_SIZE; i++)
+ for (int j = 0; j < num_quants; j++)
+ {
+ quantsl.push (i + quants[j] + int (yl));
+ quantsr.push (i + quants[j] + int (yr));
+ }
+
+ Array<Quant_score> qscores;
- if (a == gh_symbol2scm ("majority")) // should get default from paper.
- beam_dir = (count[UP] == count[DOWN]) ? neutral_dir
- : (count[UP] > count[DOWN]) ? UP : DOWN;
- else if (a == gh_symbol2scm ("mean"))
- // mean center distance
- beam_dir = (total[UP] == total[DOWN]) ? neutral_dir
- : (total[UP] > total[DOWN]) ? UP : DOWN;
- else if (a == gh_symbol2scm ("median"))
+ for(int l =0; l < quantsl.size(); l++)
+ for(int r =0; r < quantsr.size(); r++)
+ {
+ Quant_score qs;
+ qs.yl = quantsl[l];
+ qs.yr = quantsr[r];
+ qs.demerits = 0.0;
+
+ qscores.push (qs);
+ }
+
+
+ SCM score_funcs = me->get_grob_property("quant-score-functions");
+ for (SCM s = score_funcs; gh_pair_p (s); s = gh_cdr (s))
{
- // median center distance
- if (count[DOWN] && count[UP])
+ SCM f = gh_car (s);
+ for (int i = qscores.size(); i--;)
{
- beam_dir = (total[UP] / count[UP] == total[DOWN] / count[DOWN])
- ? neutral_dir
- : (total[UP] / count[UP] > total[DOWN] / count[DOWN]) ? UP : DOWN;
+ if (qscores[i].demerits < 1000)
+ {
+ SCM score = gh_call3 (f,
+ me->self_scm(),
+ gh_double2scm (qscores[i].yl),
+ gh_double2scm (qscores[i].yr));
+
+ qscores[i].demerits += gh_scm2double (score);
+ }
}
- else
+ }
+
+ Real best = 1e6;
+ int best_idx = -1;
+ for (int i = qscores.size(); i--;)
+ {
+ if (qscores[i].demerits < best)
{
- beam_dir = (count[UP] == count[DOWN]) ? neutral_dir
- : (count[UP] > count[DOWN]) ? UP : DOWN;
+ best = qscores [i].demerits ;
+ best_idx = i;
}
}
+
- return beam_dir;
+ me->set_grob_property ("positions",
+ gh_cons (gh_double2scm (qscores[best_idx].yl),
+ gh_double2scm (qscores[best_idx].yr))
+ );
+ me->set_grob_property ("quant-score",gh_double2scm (qscores[best_idx].demerits));
+
+ return SCM_UNSPECIFIED;
}
-void
-Beam::set_direction (Direction d)
+MAKE_SCHEME_CALLBACK (Beam, score_slopes_dy, 3);
+SCM
+Beam::score_slopes_dy (SCM smob, SCM syl, SCM syr)
{
- dir_ = d;
- for (int i=0; i <stems_.size (); i++)
- {
- Stem *s = stems_[i];
- s->set_elt_property ("beam-dir", gh_int2scm (d));
+ Grob*me = unsmob_grob(smob);
+ Real yl = gh_scm2double (syl);
+ Real yr = gh_scm2double (syr);
+ Real dy = yr - yl;
+
+ SCM sdy = me->get_grob_property("least-squares-dy");
+ SCM posns = me->get_grob_property ("positions");
- SCM force = s->remove_elt_property ("dir-forced");
- if (force == SCM_UNDEFINED)
- s->dir_ = d;
+ Real dy_mus = gh_number_p (sdy) ? gh_scm2double (sdy) : 0.0;
+ Real dy_damp = - gh_scm2double (gh_car(posns)) + gh_scm2double (gh_cdr (posns));
+
+ Real dem = 0.0;
+ if (sign (dy_damp) != sign (dy))
+ {
+ dem += 800;
}
-}
+
+ dem += 400* (0 >? (fabs(dy) - fabs(dy_mus)));
+
-/*
- See Documentation/tex/fonts.doc
- */
+ dem += shrink_extra_weight (fabs (dy_damp) - fabs(dy))* 10;
+ return gh_double2scm (dem);
+}
-void
-Beam::solve_slope ()
+MAKE_SCHEME_CALLBACK (Beam, score_stem_lengths, 3);
+SCM
+Beam::score_stem_lengths (SCM smob, SCM syl, SCM syr)
{
- assert (sinfo_.size () > 1);
+ Grob*me = unsmob_grob(smob);
+ Real yl = gh_scm2double (syl);
+ Real yr = gh_scm2double (syr);
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
- Least_squares l;
- for (int i=0; i < sinfo_.size (); i++)
+ Real demerit_score = 0.0 ;
+
+ for (int i=0; i < stems.size (); i++)
{
- l.input.push (Offset (sinfo_[i].x_, sinfo_[i].idealy_f_));
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+
+ Real current_y = calc_stem_y_f (me, s, Interval(yl,yr));
+ Stem_info info = Stem::calc_stem_info (s);
+ Direction d = Directional_element_interface::get (s);
+
+ demerit_score += 500 * ( 0 >? (info.miny_f_ - d*current_y));
+ demerit_score += 500 * ( 0 >? (d * current_y - info.maxy_f_));
+
+ demerit_score += 5 * shrink_extra_weight (d * current_y - info.idealy_f_);
}
- l.minimise (slope_f_, left_y_);
-}
-/*
- ugh. Naming: this doesn't check, but sets as well.
- */
-
+ demerit_score *= 2.0 /stems.size();
+
+ return gh_double2scm (demerit_score);
+}
Real
-Beam::check_stemlengths_f (bool set_b)
+my_modf(Real x)
{
- Real interbeam_f = paper_l ()->interbeam_f (multiple_i_);
+ return x - floor(x);
+}
+
- Real beam_f = paper_l ()->get_var ("beam_thickness");;
- Real staffline_f = paper_l ()-> get_var ("stafflinethickness");
- Real epsilon_f = staffline_f / 8;
- Real dy_f = 0.0;
- for (int i=0; i < sinfo_.size (); i++)
+
+MAKE_SCHEME_CALLBACK (Beam, score_forbidden_quants, 3);
+SCM
+Beam::score_forbidden_quants (SCM smob, SCM syl, SCM syr)
+{
+ Grob*me = unsmob_grob(smob);
+ Real yl = gh_scm2double (syl);
+ Real yr = gh_scm2double (syr);
+ Real rad = Staff_symbol_referencer::staff_radius (me);
+ Real dem = 0.0;
+ if (fabs (yl) < 2*rad && fabs( my_modf(yl) - 0.5) < 1e-3)
+ dem += 1000;
+ if (fabs (yr) < 2*rad && fabs( my_modf(yr) - 0.5) < 1e-3)
+ dem += 1000;
+
+
+ int multiplicity = get_multiplicity (me);
+ // todo: use multiplicity of outer stems.
+ if (multiplicity >= 2)
{
- Real y = sinfo_[i].x_ * slope_f_ + left_y_;
+ Real slt = me->paper_l()->get_var("stafflinethickness");
+ Real ss = Staff_symbol_referencer::staff_space(me);
+ Real thickness = gh_scm2double (me->get_grob_property ("thickness")) * ss;
- // correct for knee
- if (dir_ != sinfo_[i].dir_)
+ Real beam_space= (2*ss + slt - 3 *thickness) / 2.0;
+ if (multiplicity >= 4)
{
- Real internote_f = sinfo_[i].stem_l_->staff_line_leading_f ()/2;
- y -= dir_ * (beam_f / 2
- + (sinfo_[i].mult_i_ - 1) * interbeam_f) / internote_f;
- if (!i && sinfo_[i].stem_l_->staff_symbol_l () !=
- sinfo_.top ().stem_l_->staff_symbol_l ())
- y += dir_ * (multiple_i_ - (sinfo_[i].stem_l_->flag_i_ - 2) >? 0)
- * interbeam_f / internote_f;
+ beam_space = (3*ss + slt - 4 * thickness) /3.0;
}
- 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 vertical offset"));
- dy_f = dy_f >? sinfo_[i].miny_f_ - y;
- }
+ Direction d = Directional_element_interface::get (me);
+ yl += d * (beam_space + thickness);
+ yr += d * (beam_space + thickness);
+ if (fabs (yl) < rad && fabs( my_modf(yl) - 0.5) < 0.1)
+ dem += 15;
+ if (fabs (yr) < rad && fabs( my_modf(yr) - 0.5) < 0.1)
+ dem += 15;
}
- return dy_f;
+
+ return gh_double2scm ( dem);
}
-void
-Beam::set_steminfo ()
-{
- if(!stems_.size ())
- return;
- assert (multiple_i_);
- int total_count_i = 0;
- int forced_count_i = 0;
- for (int i=0; i < stems_.size (); i++)
- {
- Stem *s = stems_[i];
+MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
+SCM
+Beam::least_squares (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
- 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++;
+ int count = visible_stem_count (me);
+ Interval pos (0, 0);
+
+ if (count <= 1)
+ {
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+ return SCM_UNSPECIFIED;
}
+
+ Direction dir = Directional_element_interface::get (me);
- 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 (multiple_i_ <? stem_max));
-
- Real leftx = 0;
- for (int i=0; i < stems_.size (); i++)
+ Interval ideal (Stem::calc_stem_info (first_visible_stem (me)).idealy_f_,
+ Stem::calc_stem_info (last_visible_stem (me)).idealy_f_);
+
+ if (!ideal.delta ())
{
- Stem *s = stems_[i];
+ Interval chord (Stem::chord_start_f (first_visible_stem (me)),
+ Stem::chord_start_f (last_visible_stem (me)));
+
+
/*
- 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))
+ TODO : use scoring for this.
+
+ complicated, because we take stem-info.ideal for determining
+ beam slopes.
+
+ */
+ /* Make simple beam on middle line have small tilt */
+ if (!ideal[LEFT] && chord.delta () && count == 2)
{
- if (s->invisible_b ())
- continue;
+ Direction d = (Direction)(sign (chord.delta ()) * dir);
+ pos[d] = gh_scm2double (me->get_grob_property ("thickness")) / 2
+ * dir;
+ pos[-d] = - pos[d];
+ }
+ else
+ {
+ pos = ideal;
+ pos[LEFT] *= dir ;
+ pos[RIGHT] *= dir ;
}
+ }
+ else
+ {
+ Array<Offset> ideals;
- Stem_info info (s, multiple_i_);
- 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;
+ // ugh -> use commonx
+ Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+ ideals.push (Offset (s->relative_coordinate (0, X_AXIS) - x0,
+ Stem::calc_stem_info (s).idealy_f_));
}
- sinfo_.push (info);
+ Real y;
+ Real dydx;
+ minimise_least_squares (&dydx, &y, ideals);
+
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ Real dy = dydx * dx;
+ me->set_grob_property ("least-squares-dy", gh_double2scm (dy * dir));
+
+ pos = Interval (y*dir, (y+dy) * dir);
}
+
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+ return SCM_UNSPECIFIED;
}
-void
-Beam::calculate_slope ()
+MAKE_SCHEME_CALLBACK (Beam, check_concave, 1);
+SCM
+Beam::check_concave (SCM smob)
{
- if (!sinfo_.size ())
- slope_f_ = left_y_ = 0;
- else if (sinfo_[0].idealy_f_ == sinfo_.top ().idealy_f_)
+ Grob *me = unsmob_grob (smob);
+
+ Link_array<Item> stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size ();)
{
- slope_f_ = 0;
- left_y_ = sinfo_[0].idealy_f_;
- left_y_ *= dir_;
+ if (Stem::invisible_b (stems[i]))
+ stems.del (i);
+ else
+ i++;
}
- else
+
+ if (stems.size () < 3)
+ return SCM_UNSPECIFIED;
+
+ /* Concaveness try #2: Sum distances of inner noteheads that
+ fall outside the interval of the two outer noteheads */
+ Real concave = 0;
+ Interval iv (Stem::chord_start_f (stems[0]),
+ Stem::chord_start_f (stems.top ()));
+
+ if (iv[MAX] < iv[MIN])
+ iv.swap ();
+
+ for (int i = 1; i < stems.size () - 1; i++)
{
- solve_slope ();
- Real solved_slope_f = slope_f_;
+ Real c = 0;
+ Real f = Stem::chord_start_f (stems[i]);
+ if ((c = f - iv[MAX]) > 0)
+ concave += c;
+ else if ((c = f - iv[MIN]) < 0)
+ concave += c;
+ }
- /*
- steep slope running against lengthened stem is suspect
- */
- Real dx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
+ Direction dir = Directional_element_interface::get (me);
+ concave *= dir;
+
+ Real concaveness = concave / (stems.size () - 2);
+ /* ugh: this is the a kludge to get input/regression/beam-concave.ly
+ to behave as baerenreiter. */
+ concaveness /= (stems.size () - 2);
+
+ Real r = gh_scm2double (me->get_grob_property ("concaveness-threshold"));
- // urg, these y internote-y-dimensions
- Real internote_f = stems_[0]->staff_line_leading_f ()/2;
+ /* TODO: some sort of damping iso -> plain horizontal */
+ if (concaveness > r)
+ {
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real r = pos.linear_combination (0);
+ me->set_grob_property ("positions", ly_interval2scm (Interval (r, r)));
+ me->set_grob_property ("least-squares-dy", gh_double2scm (0));
+ }
- Real lengthened = paper_l ()->get_var ("beam_lengthened") / internote_f;
- Real steep = paper_l ()->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)))
- {
- slope_f_ = 0;
- }
+ return SCM_UNSPECIFIED;
+}
- /*
- 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);
+/* This neat trick is by Werner Lemberg,
+ damped = tanh (slope)
+ corresponds with some tables in [Wanske] CHECKME */
+MAKE_SCHEME_CALLBACK (Beam, slope_damping, 1);
+SCM
+Beam::slope_damping (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
- if (damping)
- slope_f_ = 0.6 * tanh (slope_f_) / damping;
-
- quantise_dy ();
+ if (visible_stem_count (me) <= 1)
+ return SCM_UNSPECIFIED;
- Real damped_slope_dy_f = (solved_slope_f - slope_f_) * dx_f / 2;
- left_y_ += damped_slope_dy_f;
+ SCM s = me->get_grob_property ("damping");
+ int damping = gh_scm2int (s);
- left_y_ *= dir_;
- slope_f_ *= dir_;
+ if (damping)
+ {
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real dy = pos.delta ();
+
+ // ugh -> use commonx
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS)
+ - first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ Real dydx = dy && dx ? dy/dx : 0;
+ dydx = 0.6 * tanh (dydx) / damping;
+
+ Real damped_dy = dydx * dx;
+ pos[LEFT] += (dy - damped_dy) / 2;
+ pos[RIGHT] -= (dy - damped_dy) / 2;
+
+ me->set_grob_property ("positions", ly_interval2scm (pos));
}
+ return SCM_UNSPECIFIED;
}
-void
-Beam::quantise_dy ()
+/* Prevent interference from stafflines. */
+Interval
+Beam::quantise_interval (Grob *me, Interval pos, Direction quant_dir)
{
- /*
- [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
- */
+ int multiplicity = get_multiplicity (me);
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real thick = me->paper_l ()->get_var ("stafflinethickness");
+ Direction dir = Directional_element_interface::get (me);
+ Real dy = pos.delta ();
- SCM q = get_elt_property ("slope-quantisation");
+ Drul_array<Interval> bounds;
+ Direction d = LEFT;
+ do
+ {
+ SCM proc = d == LEFT
+ ? me->get_grob_property ("left-position-quant-function")
+ : me->get_grob_property ("right-position-quant-function");
+
+ SCM quants = scm_apply (proc,
+ me->self_scm (),
+ scm_list_n (gh_int2scm (multiplicity),
+ gh_double2scm (dir),
+ gh_double2scm (dy),
+ gh_double2scm (thick / staff_space),
+ /* HUH? */
+ SCM_EOL,
+ SCM_UNDEFINED));
+
+ Array<Real> a;
+ for (SCM i = quants; gh_pair_p (i); i = ly_cdr (i))
+ a.push (gh_scm2double (ly_car (i)));
+
+ if (a.size () <= 1)
+ return pos;
+
+ bounds[d] = quantise_iv (a, pos[d]*dir/staff_space) * staff_space;
+ }
+ while (flip (&d) != LEFT);
- if (q == gh_symbol2scm ("none"))
- return;
+ Real ady = abs (dy);
- Real interline_f = stems_[0]->staff_line_leading_f ();
- Real internote_f = interline_f / 2;
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- Real beam_f = paper_l ()->get_var ("beam_thickness");;
+ // quant direction hints disabled for now
+ int q = 0;//(int)quant_dir;
- Real dx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
+ /* TODO: make smart choice, find best left/right quants pair.
- // dim(y) = internote; so slope = (y/internote)/x
- Real dy_f = dx_f * abs (slope_f_ * internote_f);
+ Slope should never be steeper than least_squares (before damping)
+ (save that value?)
+ Slope should never be reduced to zero.
+ */
+ SCM s = me->get_grob_property ("least-squares-dy");
+ Real lsdy = gh_number_p (s) ? gh_scm2double (s) : 0;
+
+ // Interval qpos (0, 1000 * sign (dy));
+ Interval qpos;
+ Real epsilon = staff_space / 10;
+ Direction ldir = LEFT;
+ do
+ {
+ Direction rdir = LEFT;
+ do
+ {
+ Interval i (bounds[LEFT][ldir]*dir, bounds[RIGHT][rdir]*dir);
+ if ((!lsdy
+ || (abs (i.delta ()) <= abs (lsdy) + epsilon
+ && sign (i.delta ()) == sign (lsdy)))
+ && (abs (abs (i.delta ()) - ady)
+ <= abs (abs (qpos.delta ()) - ady))
+ && sign (i.delta ()) == sign (pos.delta ())
+ && (!q
+ || (i[LEFT]*q >= pos[LEFT]*q && i[RIGHT]*q
+ >= pos[RIGHT]*q)))
+ qpos = i;
+ }
+ while (flip (&rdir) != LEFT);
+ }
+ while (flip (&ldir) != LEFT);
- Real quanty_f = 0.0;
+ return qpos;
+}
- 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);
+/* Quantise vertical position (left and right) of beam.
+ Generalisation of [Ross]. */
+MAKE_SCHEME_CALLBACK (Beam, quantise_position, 1);
+SCM
+Beam::quantise_position (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
- Interval iv = quantise_iv (allowed_fraction, interline_f, dy_f);
- quanty_f = (dy_f - iv[SMALLER] <= iv[BIGGER] - dy_f)
- ? iv[SMALLER]
- : iv[BIGGER];
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real y_shift = check_stem_length_f (me, pos);
+ pos += y_shift;
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Direction dir = Directional_element_interface::get (me);
+ for (int i = 0; i < 10; i++)
+ {
+ Interval qpos = quantise_interval (me, pos, CENTER);
+ // how to check for uninitised interval, (inf, -inf)?
+ if (qpos[LEFT] < 1000)
+ {
+ y_shift = check_stem_length_f (me, qpos);
+ if (y_shift * dir < staff_space / 2)
+ {
+ pos = qpos;
+ break;
+ }
+ }
+ pos += ((i + 1) * ((i % 2) * -2 + 1)) * dir * staff_space / 4;
+ }
+
+
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+ set_stem_lengths (me);
- slope_f_ = (quanty_f / dx_f) / internote_f * sign (slope_f_);
-}
+#if 0
+ pos = ly_scm2interval (me->get_grob_property ("positions"));
+
+ y_shift = check_stem_length_f (me, pos);
-/*
+ Real half_space = Staff_symbol_referencer::staff_space (me) / 2;
+ /* HMMM */
+ if (y_shift > half_space / 4)
+ {
+ pos += y_shift;
+ int quant_dir = 0;
+ /* for significantly lengthened or shortened stems,
+ request quanting the other way.
+ HMMM */
+ if (abs (y_shift) > half_space / 2)
+ quant_dir = sign (y_shift) * Directional_element_interface::get (me);
+ pos = quantise_interval (me, pos, (Direction)quant_dir);
+ }
- Prevent interference from stafflines and beams. See Documentation/tex/fonts.doc
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+#endif
- */
-void
-Beam::quantise_left_y (bool extend_b)
-{
- /*
- 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");
-
-
- /*
- ----------------------------------------------------------
- ########
- ########
- ########
- --------------########------------------------------------
- ########
+ return SCM_UNSPECIFIED;
+}
- hang straddle sit inter hang
- */
+MAKE_SCHEME_CALLBACK (Beam, end_after_line_breaking, 1);
+SCM
+Beam::end_after_line_breaking (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+ set_stem_lengths (me);
+
+ return SCM_UNSPECIFIED;
+}
- Real space = stems_[0]->staff_line_leading_f ();
- Real internote_f = space /2;
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- Real beam_f = paper_l ()->get_var ("beam_thickness");;
+/*
+ Calculate the Y position of the stem-end, given the Y-left, Y-right
+ in POS, and for stem S.
+ */
+Real
+Beam::calc_stem_y_f (Grob *me, Item* s, Interval pos)
+{
+ int beam_multiplicity = get_multiplicity (me);
+ int stem_multiplicity = (Stem::flag_i (s) - 2) >? 0;
+
+ SCM space_proc = me->get_grob_property ("space-function");
+ SCM space = gh_call1 (space_proc, gh_int2scm (beam_multiplicity));
+
+ Real thick = gh_scm2double (me->get_grob_property ("thickness"));
+ Real interbeam_f = gh_scm2double (space);
+
+ // ugh -> use commonx
+ Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ Real dy = pos.delta ();
+ Real stem_y = (dy && dx
+ ? (s->relative_coordinate (0, X_AXIS) - x0) / dx
+ * dy
+ : 0) + pos[LEFT];
+
+ /* knee */
+ Direction dir = Directional_element_interface::get (me);
+ Direction sdir = Directional_element_interface::get (s);
+
+ /* knee */
+ if (dir!= sdir)
+ {
+ stem_y -= dir * (thick / 2 + (beam_multiplicity - 1) * interbeam_f);
+
+ // huh, why not for first visible?
+ if (Staff_symbol_referencer::staff_symbol_l (s)
+ != Staff_symbol_referencer::staff_symbol_l (last_visible_stem (me)))
+ stem_y += Directional_element_interface::get (me)
+ * (beam_multiplicity - stem_multiplicity) * interbeam_f;
+ }
- /*
- [TODO]
- it would be nice to have all allowed positions in a runtime matrix:
- (multiplicity, minimum_beam_dy, maximum_beam_dy)
- */
+ return stem_y;
+}
- Real straddle = 0;
- Real sit = beam_f / 2 - staffline_f / 2;
- Real hang = space - beam_f / 2 + staffline_f / 2;
+/* Make very sure that we don't have stems that are too short.
+ Try our best not to have stems that are too long (think: knees).
+
+ Optionally (testing): try to lengthen more, to reach more ideal
+ stem lengths */
+Real
+Beam::check_stem_length_f (Grob *me, Interval pos)
+{
+ Real shorten = 0;
+ Real lengthen = 0;
+ Direction dir = Directional_element_interface::get (me);
- /*
- Put all allowed positions into an array.
- Whether a position is allowed or not depends on
- strictness of quantisation, multiplicity and direction.
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
- For simplicity, we'll assume dir = UP and correct if
- dir = DOWN afterwards.
- */
- // isn't this asymmetric ? --hwn
+ bool knee = false;
+ int ideal_lengthen_count = 0;
+ Real ideal_lengthen = 0;
+ int ideal_shorten_count = 0;
+ Real ideal_shorten = 0;
- // dim(left_y_) = internote
- Real dy_f = dir_ * left_y_ * internote_f;
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
- Real beamdx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
- Real beamdy_f = beamdx_f * slope_f_ * internote_f;
+ knee |= dir != Directional_element_interface::get (s);
- Array<Real> allowed_position;
- if (q == gh_symbol2scm ("normal"))
- {
- if ((multiple_i_ <= 2) || (abs (beamdy_f) >= staffline_f / 2))
- allowed_position.push (straddle);
- if ((multiple_i_ <= 1) || (abs (beamdy_f) >= staffline_f / 2))
- allowed_position.push (sit);
- allowed_position.push (hang);
- }
- else if (q == gh_symbol2scm ("traditional"))
- {
- // TODO: check and fix TRADITIONAL
- if ((multiple_i_ <= 2) || (abs (beamdy_f) >= staffline_f / 2))
- allowed_position.push (straddle);
- if ((multiple_i_ <= 1) && (beamdy_f <= staffline_f / 2))
- allowed_position.push (sit);
- if (beamdy_f >= -staffline_f / 2)
- allowed_position.push (hang);
- }
+ Real stem_y = calc_stem_y_f (me, s, pos);
+
+ stem_y *= dir;
+ Stem_info info = Stem::calc_stem_info (s);
+ shorten = shorten <? info.maxy_f_ - stem_y;
+ lengthen = lengthen >? info.miny_f_ - stem_y;
- Interval iv = quantise_iv (allowed_position, space, dy_f);
+ if (info.idealy_f_ - stem_y > 0)
+ {
+#if 0
+ ideal_lengthen += info.idealy_f_ - stem_y;
+ ideal_lengthen_count++;
+#else
+ ideal_lengthen = ideal_lengthen >? info.idealy_f_ - stem_y;
+ ideal_lengthen_count = 1;
+#endif
+ }
+ else if (info.idealy_f_ - stem_y < 0)
+ {
+#if 0
+ ideal_shorten += info.idealy_f_ - stem_y;
+ ideal_shorten_count++;
+#else
+ ideal_shorten = ideal_shorten <? info.idealy_f_ - stem_y;
+ ideal_shorten_count = 1;
+#endif
+ }
+ }
+
+ if (lengthen && shorten)
+ me->warning (_ ("weird beam vertical offset"));
- Real quanty_f = dy_f - iv[SMALLER] <= iv[BIGGER] - dy_f ? iv[SMALLER] : iv[BIGGER];
- if (extend_b)
- quanty_f = iv[BIGGER];
+ if (ideal_lengthen_count)
+ lengthen = (ideal_lengthen / ideal_lengthen_count) >? lengthen;
+ if (knee && ideal_shorten_count)
+ shorten = (ideal_shorten / ideal_shorten_count) <? shorten;
- // dim(left_y_) = internote
- left_y_ = dir_ * quanty_f / internote_f;
+ if (lengthen && shorten)
+ return dir * (lengthen + shorten);
+
+ return dir * (shorten ? shorten : lengthen);
}
+/*
+ Hmm. At this time, beam position and slope are determined. Maybe,
+ stem directions and length should set to relative to the chord's
+ position of the beam. */
void
-Beam::set_stemlens ()
+Beam::set_stem_lengths (Grob *me)
{
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- // enge floots
- Real epsilon_f = staffline_f / 8;
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+ if (stems.size () <= 1)
+ return;
+
+ Grob *common = me->common_refpoint (stems[0], Y_AXIS);
+ for (int i=1; i < stems.size (); i++)
+ if (!Stem::invisible_b (stems[i]))
+ common = common->common_refpoint (stems[i], Y_AXIS);
+
+ Direction dir = Directional_element_interface::get (me);
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real thick = gh_scm2double (me->get_grob_property ("thickness"));
+ bool ps_testing = to_boolean (ly_symbol2scm ("ps-testing"));
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
- // je bent zelf eng --hwn.
- Real dy_f = check_stemlengths_f (false);
- for (int i = 0; i < 2; i++) // 2 ?
- {
- left_y_ += dy_f * dir_;
- quantise_left_y (dy_f);
- dy_f = check_stemlengths_f (true);
- if (abs (dy_f) <= epsilon_f)
- {
- break;
- }
+ Real stem_y = calc_stem_y_f (me, s, pos);
+
+ // doesn't play well with dvips
+ if (ps_testing)
+ if (Stem::get_direction (s) == dir)
+ stem_y += Stem::get_direction (s) * thick / 2;
+
+ /* caution: stem measures in staff-positions */
+ Real id = me->relative_coordinate (common, Y_AXIS)
+ - stems[i]->relative_coordinate (common, Y_AXIS);
+ Stem::set_stemend (s, (stem_y + id) / staff_space * 2);
}
}
void
-Beam::set_beaming (Beaming_info_list *beaming)
+Beam::set_beaming (Grob *me, Beaming_info_list *beaming)
{
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_grobs (me, (Grob *)0, "stems");
+
Direction d = LEFT;
- for (int i=0; i < stems_.size (); i++)
+ for (int i=0; i < stems.size (); i++)
{
do
{
- if (stems_[i]->beams_i_drul_[d] < 0)
- stems_[i]->beams_i_drul_[d] = beaming->infos_.elem (i).beams_i_drul_[d];
+ /* Don't overwrite user override (?) */
+ if (Stem::beam_count (stems[i], d) == -1
+ /* Don't set beaming for outside of outer stems */
+ && ! (d == LEFT && i == 0)
+ && ! (d == RIGHT && i == stems.size () -1))
+ {
+ int b = beaming->infos_.elem (i).beams_i_drul_[d];
+ Stem::set_beaming (stems[i], b, d);
+ }
}
while (flip (&d) != LEFT);
}
}
-void
-Beam::do_add_processing ()
-{
- for (int i=0; i < stems_.size () ; i++)
- {
- Direction d = LEFT;
- do {
- multiple_i_ = multiple_i_ >? stems_[i]->beams_i_drul_[d];
- } while ((flip (&d)) != LEFT);
- }
-
- if (stems_.size ())
- {
- stems_[0]->beams_i_drul_[LEFT] =0;
- stems_.top()->beams_i_drul_[RIGHT] =0;
- }
-}
-
-
/*
beams to go with one stem.
- clean me up.
+ FIXME: clean me up.
*/
Molecule
-Beam::stem_beams (Stem *here, Stem *next, Stem *prev) const
+Beam::stem_beams (Grob *me, Item *here, Item *next, Item *prev, Real dydx)
{
- 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 (multiple_i_);
-
- Real internote_f = here->staff_line_leading_f ()/2;
- Real beam_f = paper_l ()->get_var ("beam_thickness");;
-
- Real dy = interbeam_f;
- Real stemdx = staffline_f;
- Real sl = slope_f_* internote_f;
-
+ // ugh -> use commonx
+ if ((next
+ && !(next->relative_coordinate (0, X_AXIS)
+ > here->relative_coordinate (0, X_AXIS)))
+ || (prev
+ && !(prev->relative_coordinate (0, X_AXIS)
+ < here->relative_coordinate (0, X_AXIS))))
+ programming_error ("Beams are not left-to-right");
+
+ int multiplicity = get_multiplicity (me);
+
+ SCM space_proc = me->get_grob_property ("space-function");
+ SCM space = gh_call1 (space_proc, gh_int2scm (multiplicity));
+
+ Real thick = gh_scm2double (me->get_grob_property ("thickness"));
+ Real interbeam_f = gh_scm2double (space);
+
+ Real bdy = interbeam_f;
+
Molecule leftbeams;
Molecule rightbeams;
- // UGH
Real nw_f;
- if (!here->head_l_arr_.size ())
+ if (!Stem::first_head (here))
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");
+ else {
+ int t = Stem::type_i (here);
+
+ SCM proc = me->get_grob_property ("flag-width-function");
+ SCM result = gh_call1 (proc, gh_int2scm (t));
+ nw_f = gh_scm2double (result);
+ }
+
+
+ Direction dir = Directional_element_interface::get (me);
+
+ /* [Tremolo] beams on whole notes may not have direction set? */
+ if (dir == CENTER)
+ dir = Directional_element_interface::get (here);
+
/* 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 ();
+ int lhalfs= lhalfs = Stem::beam_count (here, LEFT)
+ - Stem::beam_count (prev, RIGHT);
+ int lwholebeams= Stem::beam_count (here, LEFT)
+ <? Stem::beam_count (prev, RIGHT);
+
+ /* Half beam should be one note-width,
+ but let's make sure two half-beams never touch */
+
+ // FIXME: TODO (check) stem width / sloped beams
+ Real w = here->relative_coordinate (0, X_AXIS)
+ - prev->relative_coordinate (0, X_AXIS);
+ Real stem_w = gh_scm2double (prev->get_grob_property ("thickness"))
+ // URG
+ * me->paper_l ()->get_var ("stafflinethickness");
+
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));
+ a = Lookup::beam (dydx, w + stem_w, thick);
+ a.translate (Offset (-w, -w * dydx));
+ a.translate_axis (-stem_w/2, X_AXIS);
for (int j = 0; j < lhalfs; j++)
{
Molecule b (a);
- b.translate_axis (-dir_ * dy * (lwholebeams+j), Y_AXIS);
+ b.translate_axis (-dir * bdy * (lwholebeams+j), Y_AXIS);
leftbeams.add_molecule (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];
+ int rhalfs = Stem::beam_count (here, RIGHT)
+ - Stem::beam_count (next, LEFT);
+ int rwholebeams= Stem::beam_count (here, RIGHT)
+ <? Stem::beam_count (next, LEFT);
+
+ Real w = next->relative_coordinate (0, X_AXIS)
+ - here->relative_coordinate (0, X_AXIS);
+
+ Real stem_w = gh_scm2double (next->get_grob_property ("thickness"))
+ // URG
+ * me->paper_l ()->get_var ("stafflinethickness");
- 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);
+ Molecule a = Lookup::beam (dydx, w + stem_w, thick);
+ a.translate_axis (- stem_w/2, X_AXIS);
int j = 0;
Real gap_f = 0;
-
- SCM gap = get_elt_property ("beam-gap");
- if (gap != SCM_UNDEFINED)
+
+ SCM gap = me->get_grob_property ("gap");
+ if (gh_number_p (gap))
{
- int gap_i = gh_scm2int ( (gap));
+ int gap_i = gh_scm2int ((gap));
int nogap = rwholebeams - gap_i;
for (; j < nogap; j++)
{
Molecule b (a);
- b.translate_axis (-dir_ * dy * j, Y_AXIS);
+ b.translate_axis (-dir * bdy * j, Y_AXIS);
rightbeams.add_molecule (b);
}
- // TODO: notehead widths differ for different types
- gap_f = nw_f / 2;
+ if (Stem::invisible_b (here))
+ gap_f = nw_f;
+ else
+ gap_f = nw_f / 2;
w -= 2 * gap_f;
- a = lookup_l ()->beam (sl, w + stemdx, beam_f);
+ a = Lookup::beam (dydx, w + stem_w, thick);
}
for (; j < rwholebeams; j++)
{
Molecule b (a);
- if (!here->invisible_b ())
- b.translate (Offset (gap_f, -dir_ * dy * j));
+ Real tx = 0;
+ if (Stem::invisible_b (here))
+ // ugh, see chord-tremolo.ly
+ tx = (-dir + 1) / 2 * nw_f * 1.5 + gap_f/4;
else
- b.translate (Offset (0, -dir_ * dy * j));
+ tx = gap_f;
+ b.translate (Offset (tx, -dir * bdy * j));
rightbeams.add_molecule (b);
}
w = w/2 <? nw_f;
if (rhalfs)
- a = lookup_l ()->beam (sl, w, beam_f);
+ a = Lookup::beam (dydx, w, thick);
for (; j < rwholebeams + rhalfs; j++)
{
Molecule b (a);
- b.translate_axis (-dir_ * dy * j, Y_AXIS);
+ b.translate_axis (- dir * bdy * j, Y_AXIS);
rightbeams.add_molecule (b);
}
}
leftbeams.add_molecule (rightbeams);
- /*
- Does beam quanting think of the asymetry of beams?
- Refpoint is on bottom of symbol. (FIXTHAT) --hwn.
- */
+ /* Does beam quanting think of the asymetry of beams?
+ Refpoint is on bottom of symbol. (FIXTHAT) --hwn. */
return leftbeams;
}
+MAKE_SCHEME_CALLBACK (Beam, brew_molecule, 1);
+SCM
+Beam::brew_molecule (SCM smob)
+{
+ Grob *me =unsmob_grob (smob);
+
+ Molecule mol;
+ if (!gh_pair_p (me->get_grob_property ("stems")))
+ return SCM_EOL;
+ Real x0, dx;
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ if (visible_stem_count (me))
+ {
+ // ugh -> use commonx
+ x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ }
+ else
+ {
+ x0 = stems[0]->relative_coordinate (0, X_AXIS);
+ dx = stems.top ()->relative_coordinate (0, X_AXIS) - x0;
+ }
+
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real dy = pos.delta ();
+ Real dydx = dy && dx ? dy/dx : 0;
+
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item *item = stems[i];
+ Item *prev = (i > 0)? stems[i-1] : 0;
+ Item *next = (i < stems.size ()-1) ? stems[i+1] :0;
+
+ Molecule sb = stem_beams (me, item, next, prev, dydx);
+ Real x = item->relative_coordinate (0, X_AXIS) - x0;
+ sb.translate (Offset (x, x * dydx + pos[LEFT]));
+ mol.add_molecule (sb);
+ }
+
+ mol.translate_axis (x0
+ - dynamic_cast<Spanner*> (me)
+ ->get_bound (LEFT)->relative_coordinate (0, X_AXIS),
+ X_AXIS);
+
+ if (0)
+ {
+ /*
+ This code prints the demerits for each beam. Perhaps this
+ should be switchable for those who want to twiddle with the
+ parameters.
+ */
+ SCM dem = me->get_grob_property ("quant-score");
+ Real s = gh_scm2double (dem);
+ String str = to_str (s);
+
+ SCM properties = Font_interface::font_alist_chain (me);
+
+ Molecule tm = Text_item::text2molecule (me, gh_str02scm (str.ch_C()), properties);
+ mol.add_at_edge (Y_AXIS, UP, tm, 5.0);
+ }
+
+ return mol.smobbed_copy ();
+}
+
+int
+Beam::forced_stem_count (Grob *me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ int f = 0;
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item *s = stems[i];
+
+ if (Stem::invisible_b (s))
+ continue;
+
+ if (((int)Stem::chord_start_f (s))
+ && (Stem::get_direction (s) != Stem::get_default_dir (s)))
+ f++;
+ }
+ return f;
+}
+
+
+
+
+/* TODO:
+ use filter and standard list functions.
+ */
+int
+Beam::visible_stem_count (Grob *me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ int c = 0;
+ for (int i = stems.size (); i--;)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ c++;
+ }
+ return c;
+}
+
+Item*
+Beam::first_visible_stem (Grob *me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size (); i++)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
+ }
+ return 0;
+}
+
+Item*
+Beam::last_visible_stem (Grob *me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ for (int i = stems.size (); i--;)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
+ }
+ return 0;
+}
+
+
+/*
+ [TODO]
+ handle rest under beam (do_post: beams are calculated now)
+ what about combination of collisions and rest under beam.
+
+ Should lookup
+
+ rest -> stem -> beam -> interpolate_y_position ()
+*/
+MAKE_SCHEME_CALLBACK (Beam, rest_collision_callback, 2);
+SCM
+Beam::rest_collision_callback (SCM element_smob, SCM axis)
+{
+ Grob *rest = unsmob_grob (element_smob);
+ Axis a = (Axis) gh_scm2int (axis);
+
+ assert (a == Y_AXIS);
+
+ Grob *st = unsmob_grob (rest->get_grob_property ("stem"));
+ Grob *stem = st;
+ if (!stem)
+ return gh_double2scm (0.0);
+ Grob *beam = unsmob_grob (stem->get_grob_property ("beam"));
+ if (!beam
+ || !Beam::has_interface (beam)
+ || !Beam::visible_stem_count (beam))
+ return gh_double2scm (0.0);
+
+ // make callback for rest from this.
+ // todo: make sure this calced already.
+
+ // Interval pos = ly_scm2interval (beam->get_grob_property ("positions"));
+ Interval pos (0, 0);
+ SCM s = beam->get_grob_property ("positions");
+ if (gh_pair_p (s) && gh_number_p (ly_car (s)))
+ pos = ly_scm2interval (s);
+
+ Real dy = pos.delta ();
+ // ugh -> use commonx
+ Real x0 = first_visible_stem (beam)->relative_coordinate (0, X_AXIS);
+ Real dx = last_visible_stem (beam)->relative_coordinate (0, X_AXIS) - x0;
+ Real dydx = dy && dx ? dy/dx : 0;
+
+ Direction d = Stem::get_direction (stem);
+ Real beamy = (stem->relative_coordinate (0, X_AXIS) - x0) * dydx + pos[LEFT];
+
+ Real staff_space = Staff_symbol_referencer::staff_space (rest);
+
+
+ Real rest_dim = rest->extent (rest, Y_AXIS)[d]*2.0 / staff_space; // refp??
+
+ Real minimum_dist
+ = gh_scm2double (rest->get_grob_property ("minimum-beam-collision-distance"));
+ Real dist =
+ minimum_dist + -d * (beamy - rest_dim) >? 0;
+
+ int stafflines = Staff_symbol_referencer::line_count (rest);
+
+ // move discretely by half spaces.
+ int discrete_dist = int (ceil (dist));
+
+ // move by whole spaces inside the staff.
+ if (discrete_dist < stafflines+1)
+ discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
+
+ return gh_double2scm (-d * discrete_dist);
+}
+
+
+bool
+Beam::has_interface (Grob *me)
+{
+ return me->has_interface (ly_symbol2scm ("beam-interface"));
+}
+
projects / lilypond.git / blobdiff