source file of the GNU LilyPond music typesetter
- (c) 1997--1998, 1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
*/
-
/*
[TODO]
- * centre beam symbol
+ * shorter! (now +- 1000 lines)
* less hairy code
- * redo grouping
- */
+ * move paper vars to scm
+
+ remove *-hs variables, and do all y-position stuff in staff-space.
+*/
+
-#include <math.h>
+#include <math.h> // tanh.
-#include "p-col.hh"
-#include "array.hh"
-#include "proto.hh"
-#include "dimensions.hh"
+#include "molecule.hh"
+#include "directional-element-interface.hh"
+#include "beaming.hh"
#include "beam.hh"
-#include "abbreviation-beam.hh"
#include "misc.hh"
-#include "debug.hh"
-#include "atom.hh"
-#include "molecule.hh"
-#include "leastsquares.hh"
+#include "least-squares.hh"
#include "stem.hh"
#include "paper-def.hh"
#include "lookup.hh"
-#include "grouping.hh"
-
-Beam::Beam ()
-{
- slope_f_ = 0;
- solved_slope_f_ = 0;
- left_y_ = 0;
- damping_i_ = 1;
- quantisation_ = NORMAL;
- multiple_i_ = 0;
-}
+#include "group-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "cross-staff.hh"
+#include "item.hh"
+#include "spanner.hh"
+#include "warn.hh"
void
-Beam::add_stem (Stem*s)
+Beam::add_stem (Score_element*me, Score_element*s)
{
- stems_.push (s);
- s->add_dependency (this);
- s->beam_l_ = this;
-
- if (!spanned_drul_[LEFT])
- set_bounds (LEFT,s);
- else
- set_bounds (RIGHT,s);
-}
+ Pointer_group_interface:: add_element(me, "stems", s);
+
+ s->add_dependency (me);
-Molecule*
-Beam::do_brew_molecule_p () const
-{
- Molecule *mol_p = new Molecule;
- Real internote_f = paper ()->internote_f ();
+ assert (!Stem::beam_l (s));
+ s->set_elt_property ("beam", me->self_scm ());
- 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_f_ + left_y_) * internote_f));
- mol_p->add_molecule (sb);
- }
- mol_p->translate_axis (x0
- - spanned_drul_[LEFT]->absolute_coordinate (X_AXIS), X_AXIS);
-
- return mol_p;
+ add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
}
-Offset
-Beam::center () const
+int
+Beam::get_multiplicity (Score_element*me)
{
- Real w= (paper ()->note_width () + extent (X_AXIS).length ())/2.0;
- return Offset (w, (left_y_ + w* slope_f_)*paper ()->internote_f ());
-}
+ int m = 0;
+ for (SCM s = me->get_elt_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
+ {
+ Score_element * sc = unsmob_element (gh_car (s));
-void
-Beam::do_pre_processing ()
-{
- if (!dir_)
- set_default_dir ();
+ if (Stem::has_interface (sc))
+ m = m >? Stem::beam_count (sc,LEFT) >? Stem::beam_count (sc,RIGHT);
+ }
+ return m;
}
-void
-Beam::do_print () 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)
{
-#ifndef NPRINT
- DOUT << "slope_f_ " << slope_f_ << "left ypos " << left_y_;
- Spanner::do_print ();
-#endif
-}
+ Score_element * me = unsmob_element (smob);
-void
-Beam::do_post_processing ()
-{
- if (stems_.size () < 2)
+ // Why?
+ if (visible_stem_count (me) < 2)
{
- warning (_ ("beam with less than two stems"));
- transparent_b_ = true;
- return ;
+ warning (_ ("beam has less than two stems"));
}
- calculate_slope ();
- set_stemlens ();
-}
-void
-Beam::do_substitute_dependent (Score_element*o,Score_element*n)
-{
- if (Stem * os = dynamic_cast<Stem*> (o))
- stems_.substitute (os,
- dynamic_cast<Stem *> (n));
-}
+ if (!Directional_element_interface::get (me))
+ Directional_element_interface::set (me, get_default_dir (me));
-Interval
-Beam::do_width () const
-{
- return Interval (stems_[0]->hpos_f (),
- stems_.top ()->hpos_f ());
+ auto_knees (me);
+ set_stem_directions (me);
+ set_stem_shorten (me);
+
+ return SCM_EOL;
}
-void
-Beam::set_default_dir ()
+Direction
+Beam::get_default_dir (Score_element*me)
{
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);
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ for (int i=0; i <stems.size (); i++)
+ do { // HUH -- waar slaat dit op?
+ Score_element *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)
{
} while (flip(&d) != DOWN);
-#if 0
- /*
- urg? consider [b''16 a]: will get stem down!
- i'll leave this 'fix' commented-out in case something breaks.
- jcn
- */
- do {
- if (!total[d])
- count[d] = 1;
- } while (flip(&d) != DOWN);
-#endif
+ SCM func = me->get_elt_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);
- /*
- [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: get default
*/
+ return to_dir (me->get_elt_property ("default-neutral-direction"));
+}
- 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++)
+/*
+ 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::set_stem_directions (Score_element*me)
+{
+ Link_array<Item> stems
+ =Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ Direction d = Directional_element_interface::get (me);
+
+ for (int i=0; i <stems.size (); i++)
{
- Stem *s = stems_[i];
- s->beam_dir_ = dir_;
- if (!s->dir_forced_b_)
- s->dir_ = dir_;
+ Score_element *s = stems[i];
+ SCM force = s->remove_elt_property ("dir-forced");
+ if (!gh_boolean_p (force) || !gh_scm2bool (force))
+ Directional_element_interface ::set (s,d);
}
+}
+
+void
+Beam::auto_knees (Score_element*me)
+{
+ if (!auto_knee (me,"auto-interstaff-knee-gap", true))
+ auto_knee (me, "auto-knee-gap", false);
}
/*
- See Documentation/tex/fonts.doc
- */
+ Simplistic auto-knees; only consider vertical gap between two
+ adjacent chords.
-void
-Beam::solve_slope (Array<Stem_info>& sinfo)
+ `Forced' stem directions are ignored. If you don't want auto-knees,
+ don't set, or unset autoKneeGap/autoInterstaffKneeGap.
+ */
+bool
+Beam::auto_knee (Score_element*me, String gap_str, bool interstaff_b)
{
- /*
- should use minimum energy formulation (cf linespacing)
- */
- assert (sinfo.size () > 1);
- DOUT << "Beam::solve_slope: \n";
+ bool knee_b = false;
+ int knee_y = 0;
+ SCM gap = me->get_elt_property (gap_str.ch_C());
- Real staffline_f = paper ()->rule_thickness ();
- Real epsilon_f = staffline_f / 8;
-
- Real leftx = sinfo[0].x_;
- Least_squares l;
- for (int i=0; i < sinfo.size (); i++)
+ Direction d = Directional_element_interface::get (me);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ if (gh_number_p (gap))
{
- sinfo[i].x_ -= leftx;
- l.input.push (Offset (sinfo[i].x_, sinfo[i].idealy_f_));
+ Spanner*sp = dynamic_cast<Spanner*> (me);
+ int auto_gap_i = gh_scm2int (gap);
+ for (int i=1; i < stems.size (); i++)
+ {
+ bool is_b = (bool)(calc_interstaff_dist (stems[i], sp)
+ - calc_interstaff_dist (stems[i-1], sp));
+ int l_y = (int)(Stem::head_positions(stems[i-1])[d])
+ + (int)calc_interstaff_dist (stems[i-1], sp);
+ int r_y = (int)(Stem::head_positions(stems[i])[d])
+ + (int)calc_interstaff_dist (stems[i], sp);
+ int gap_i = r_y - l_y;
+
+ if ((abs (gap_i) >= auto_gap_i) && (!interstaff_b || is_b))
+ {
+ knee_y = (r_y + l_y) / 2;
+ knee_b = true;
+ break;
+ }
+ }
}
+ if (knee_b)
+ {
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item *s = stems[i];
+ int y = (int)(Stem::head_positions(s)[d])
+ + (int)calc_interstaff_dist (s, dynamic_cast<Spanner*> (me));
- l.input[0].y () += left_y_;
- l.minimise (slope_f_, left_y_);
-
- solved_slope_f_ = dir_ * slope_f_;
+ Directional_element_interface::set (s,y < knee_y ? UP : DOWN);
+ s->set_elt_property ("dir-forced", SCM_BOOL_T);
+ }
+ }
+ return knee_b;
+}
- /*
- 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_;
+/*
+ Set stem's shorten property if unset.
+ TODO:
+ take some y-position (chord/beam/nearest?) into account
+ scmify forced-fraction
+ */
+void
+Beam::set_stem_shorten (Score_element*m)
+{
+ Spanner*me = dynamic_cast<Spanner*> (m);
+ if (!visible_stem_count (me))
+ return;
- /*
- [TODO]
- think
+ Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
+ if (forced_fraction < 0.5)
+ return;
- dropping lq for stemlengths solves [d d d] [d g d] "bug..."
+ int multiplicity = get_multiplicity (me);
- but may be a bit too crude, and result in lots of
- too high beams...
+ SCM shorten = me->get_elt_property ("beamed-stem-shorten");
+ if (shorten == SCM_EOL)
+ return;
- perhaps only if slope = 0 ?
- */
+ 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;
- if (abs (slope_f_) < epsilon_f)
- left_y_ = (sinfo[0].idealy_f_ + sinfo.top ().idealy_f_) / 2;
- else
- /*
- symmetrical, but results often in having stemlength = minimal
+ /* cute, but who invented me -- how to customise ? */
+ if (forced_fraction < 1)
+ shorten_f /= 2;
- left_y_ = sinfo[0].dir_ == dir_ ? sinfo[0].miny_f_ : sinfo[0].maxy_f_;
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
- what about
- */
+ for (int i=0; i < stems.size (); i++)
{
- Real dx = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
- if (sinfo[0].dir_ == sinfo.top ().dir_)
- left_y_ = sinfo[0].idealy_f_ >? sinfo.top ().idealy_f_ - slope_f_ * dx;
- // knee
- else
- left_y_ = sinfo[0].idealy_f_;
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+ if (gh_number_p (s->get_elt_property ("shorten")))
+ s->set_elt_property ("shorten", gh_double2scm (shorten_f));
}
}
-Real
-Beam::check_stemlengths_f (Array<Stem_info>& sinfo)
+/*
+ Set elt properties height and y-position if not set.
+ Adjust stem lengths to reach beam.
+ */
+MAKE_SCHEME_CALLBACK(Beam,after_line_breaking,1);
+SCM
+Beam::after_line_breaking (SCM smob)
{
- /*
- find shortest stem and adjust left_y accordingly
- */
- Real dy = 0.0;
- for (int i=0; i < sinfo.size (); i++)
+ Score_element * me = unsmob_element (smob);
+
+ /* first, calculate y, dy */
+ Real y, dy;
+ calc_default_position_and_height (me, &y, &dy);
+ if (visible_stem_count (me))
{
- Real y = sinfo[i].x_ * slope_f_ + left_y_;
- Real my = sinfo[i].miny_f_;
+ if (suspect_slope_b (me, y, dy))
+ dy = 0;
+
+ Real damped_dy = calc_slope_damping_f (me, dy);
+ Real quantised_dy = quantise_dy_f (me, damped_dy);
- if (my - y > dy)
- dy = my -y;
+ y += (dy - quantised_dy) / 2;
+ dy = quantised_dy;
}
- return dy;
-}
+ /*
+ until here, we used only stem_info, which acts as if dir=up
+ */
+ y *= Directional_element_interface::get (me);
+ dy *= Directional_element_interface::get (me);
-void
-Beam::calculate_slope ()
-{
- Real interline_f = paper ()->interline_f ();
- Real staffline_f = paper ()->rule_thickness ();
- Real epsilon_f = staffline_f / 8;
- assert (multiple_i_);
- Array<Stem_info> sinfo;
- for (int i=0; i < stems_.size (); i++)
- {
- Stem *s = stems_[i];
+ Real half_space = Staff_symbol_referencer::staff_space (me) / 2;
- s->mult_i_ = multiple_i_;
- s->set_default_extents ();
- if (s->invisible_b ())
- continue;
+ /* weird: why do we do calc_position_and_height () ? regardless of
+ this setting?
- Stem_info info (s);
- sinfo.push (info);
+ */
+ /* check for user-override of dy */
+ SCM s = me->remove_elt_property ("height-hs");
+ if (gh_number_p (s))
+ {
+ dy = gh_scm2double (s) * half_space;
}
+ me->set_elt_property ("height", gh_double2scm (dy));
- if (! sinfo.size ())
- slope_f_ = left_y_ = 0;
- else if (sinfo.size () == 1)
+ /* check for user-override of y */
+ s = me->remove_elt_property ("y-position-hs");
+ if (gh_number_p (s))
{
- slope_f_ = 0;
- left_y_ = sinfo[0].idealy_f_;
+ y = gh_scm2double (s) * half_space;
}
else
- {
- Real y;
- Real s;
- for (int i = 0; i < 3; i++)
- {
- y = left_y_;
- solve_slope (sinfo);
- Real dy = check_stemlengths_f (sinfo);
- left_y_ += dy;
-
- // only consider recalculation if long stem adjustments
- if (!i && (left_y_ - sinfo[0].idealy_f_ < 0.5 * interline_f))
- break;
-
- if (!i)
- s = slope_f_;
- // never allow slope to tilt the other way
- else if (sign (slope_f_) != sign (s))
- {
- left_y_ = 0;
- slope_f_ = 0;
- Real dy = check_stemlengths_f (sinfo);
- left_y_ += dy;
- break;
- }
- // or become steeper
- else if (abs (slope_f_) > abs (s))
- {
- slope_f_ = s;
- Real dy = check_stemlengths_f (sinfo);
- left_y_ += dy;
- break;
- }
- if (abs (dy) < epsilon_f)
- break;
+ {
+ /* we can modify y, so we should quantise y */
+ Real y_shift = check_stem_length_f (me, y, dy);
+ y += y_shift;
+ y = quantise_y_f (me,y, dy, 0);
+ set_stem_length (me, y, dy);
+ y_shift = check_stem_length_f (me, y, dy);
+
+ if (y_shift > half_space / 4)
+ {
+ y += y_shift;
+
+ /*
+ for significantly lengthened or shortened stems,
+ request quanting the other way.
+ */
+ int quant_dir = 0;
+ if (abs (y_shift) > half_space / 2)
+ quant_dir = sign (y_shift) * Directional_element_interface::get (me);
+ y = quantise_y_f (me, y, dy, quant_dir);
}
}
+ // UGH. Y is not in staff position unit?
+ // Ik dacht datwe daar juist van weg wilden?
+ set_stem_length (me, y, dy);
+ me->set_elt_property ("y-position", gh_double2scm (y));
- left_y_ *= dir_;
- slope_f_ *= dir_;
-
- quantise_dy ();
+ return SCM_UNSPECIFIED;
}
+/*
+ See Documentation/tex/fonts.doc
+ */
void
-Beam::quantise_dy ()
+Beam::calc_default_position_and_height (Score_element*me,Real* y, Real* dy)
{
- /*
- [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
- */
-
- if (quantisation_ <= NONE)
+ *y = 0;
+ *dy = 0;
+ if (visible_stem_count (me) <= 1)
return;
- Real interline_f = paper ()->interline_f ();
- Real internote_f = interline_f / 2;
- Real staffline_f = paper ()->rule_thickness ();
- Real beam_f = paper ()->beam_thickness_f ();
+ Real first_ideal = Stem::calc_stem_info (first_visible_stem (me)).idealy_f_;
+ if (first_ideal == Stem::calc_stem_info (last_visible_stem (me)).idealy_f_)
+ {
+ *dy = 0;
+ *y = first_ideal;
+ return;
+ }
- Real dx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
+ Array<Offset> ideals;
- // dim(y) = internote; so slope = (y/internote)/x
- Real dy_f = dx_f * abs (slope_f_ * internote_f);
-
- Real quanty_f = 0.0;
+ // ugh -> use commonx
+ Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
- /* UGR. ICE in 2.8.1; bugreport filed. */
- 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);
+ 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_));
+ }
+ Real dydx;
+ minimise_least_squares (&dydx, y, ideals); // duh, takes references
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ *dy = dydx * dx;
+}
- Interval iv = quantise_iv (allowed_fraction, interline_f, dy_f);
- quanty_f = (dy_f - iv.min () <= iv.max () - dy_f)
- ? iv.min ()
- : iv.max ();
+bool
+Beam::suspect_slope_b (Score_element*me, Real y, Real dy)
+{
+ /* first, calculate y, dy */
+ /*
+ steep slope running against lengthened stem is suspect
+ */
+ Real first_ideal = Stem::calc_stem_info (first_visible_stem (me)).idealy_f_;
+ Real last_ideal = Stem::calc_stem_info (last_visible_stem (me)).idealy_f_;
+ Real lengthened = gh_scm2double (me->get_elt_property ("outer-stem-length-limit"));
+ Real steep = gh_scm2double (me->get_elt_property ("slope-limit"));
+ // 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;
- slope_f_ = (quanty_f / dx_f) / internote_f * sign (slope_f_);
+ if (((y - first_ideal > lengthened) && (dydx > steep))
+ || ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
+ {
+ return true;
+ }
+ return false;
}
-static int test_pos = 0;
+/*
+ This neat trick is by Werner Lemberg,
+ damped = tanh (slope)
+ corresponds with some tables in [Wanske]
+*/
+Real
+Beam::calc_slope_damping_f (Score_element*me,Real dy)
+{
+ SCM damp = me->get_elt_property ("damping");
+ int damping = gh_scm2int (damp);
+ if (damping)
+ {
+ // 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;
+ return dydx * dx;
+ }
+ return dy;
+}
-/*
-
- Prevent interference from stafflines and beams. See Documentation/tex/fonts.doc
-
- */
-void
-Beam::quantise_left_y (bool extend_b)
+Real
+Beam::calc_stem_y_f (Score_element*me,Item* s, Real y, Real dy)
{
- /*
- we only need to quantise the start of the beam as dy is quantised too
- if extend_b then stems must *not* get shorter
- */
+ int beam_multiplicity = get_multiplicity (me);
+ int stem_multiplicity = (Stem::flag_i (s) - 2) >? 0;
- if (quantisation_ <= NONE)
- return;
+ SCM space_proc = me->get_elt_property ("space-function");
+ SCM space = gh_call1 (space_proc, gh_int2scm (beam_multiplicity));
- /*
- ----------------------------------------------------------
- ########
- ########
- ########
- --------------########------------------------------------
- ########
-
- hang straddle sit inter hang
- */
+ Real thick = gh_scm2double (me->get_elt_property ("thickness")) ;
+ Real interbeam_f = gh_scm2double (space) ;
- Real interline_f = paper ()->interline_f ();
- Real internote_f = paper ()->internote_f ();
- Real staffline_f = paper ()->rule_thickness ();
- Real beam_f = paper ()->beam_thickness_f ();
+ // 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 stem_y = (dy && dx ? (s->relative_coordinate (0, X_AXIS) - x0) / dx * dy : 0) + y;
- /*
- [TODO]
- it would be nice to have all allowed positions in a runtime matrix:
- (multiplicity, minimum_beam_dy, maximum_beam_dy)
- */
+ /* 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);
- Real straddle = 0;
- Real sit = beam_f / 2 - staffline_f / 2;
- Real inter = interline_f / 2;
- Real hang = interline_f - 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.
+
+ // 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;
+ }
- For simplicity, we'll assume dir = UP and correct if
- dir = DOWN afterwards.
- */
+ return stem_y;
+}
- // dim(left_y_) = internote
- Real dy_f = dir_ * left_y_ * internote_f;
+Real
+Beam::check_stem_length_f (Score_element*me,Real y, Real dy)
+{
+ Real shorten = 0;
+ Real lengthen = 0;
+ Direction dir = Directional_element_interface::get (me);
- Real beamdx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
- Real beamdy_f = beamdx_f * slope_f_ * internote_f;
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
- Array<Real> allowed_position;
- if (quantisation_ != TEST)
- {
- if (quantisation_ <= 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
- // 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);
- }
- }
- else
+ for (int i=0; i < stems.size(); i++)
{
- if (test_pos == 0)
- {
- allowed_position.push (hang);
- cout << "hang" << hang << endl;
- }
- else if (test_pos==1)
- {
- allowed_position.push (straddle);
- cout << "straddle" << straddle << endl;
- }
- else if (test_pos==2)
- {
- allowed_position.push (sit);
- cout << "sit" << sit << endl;
- }
- else if (test_pos==3)
- {
- allowed_position.push (inter);
- cout << "inter" << inter << endl;
- }
- }
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
-#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
+ Real stem_y = calc_stem_y_f (me, s, y, dy);
+
+ stem_y *= dir;
+ Stem_info info = Stem::calc_stem_info (s);
- Interval iv = quantise_iv (allowed_position, interline_f, dy_f);
+ // if (0 > info.maxy_f_ - stem_y)
+ shorten = shorten <? info.maxy_f_ - stem_y;
+ // if (0 < info.miny_f_ - stem_y)
+ lengthen = lengthen >? info.miny_f_ - stem_y;
+ }
- Real quanty_f = dy_f - iv.min () <= iv.max () - dy_f ? iv.min () : iv.max ();
- if (extend_b)
- quanty_f = iv.max ();
+ if (lengthen && shorten)
+ warning (_ ("weird beam vertical offset"));
- // dim(left_y_) = internote
- left_y_ = dir_ * quanty_f / internote_f;
+ /* when all stems are too short, normal stems win */
+ 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_length (Score_element*me,Real y, Real dy)
{
- Real staffline_f = paper ()->rule_thickness ();
- Real interbeam_f = paper ()->interbeam_f (multiple_i_);
- Real internote_f = paper ()->internote_f ();
- Real beam_f = paper ()->beam_thickness_f ();
-
- // enge floots
- Real epsilon_f = staffline_f / 8;
+ Real half_space = Staff_symbol_referencer::staff_space (me)/2;
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
- /*
- Damped and quantised slopes, esp. in monotone scales such as
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
- [c d e f g a b c]
+ Real stem_y = calc_stem_y_f (me, s, y, dy);
- will soon produce the minimal stem-length for one of the extreme
- stems, which is wrong (and ugly). The minimum stemlength should
- be kept rather small, in order to handle extreme beaming, such as
+ /* caution: stem measures in staff-positions */
+ Stem::set_stemend (s,(stem_y + calc_interstaff_dist (s, dynamic_cast<Spanner*> (me))) / half_space);
+ }
+}
- [c c' 'c] %assuming no knee
-
- correctly.
- To avoid these short stems for normal cases, we'll correct for
- the loss in slope, if necessary.
-
- [TODO]
- ugh, another hack. who's next?
- Writing this all down, i realise (at last) that the Right Thing to
- do is to assign uglyness to slope and stem-lengths and then minimise
- the total uglyness of a beam.
- Steep slopes are ugly, shortened stems are ugly, lengthened stems
- are ugly.
- How to do this?
-
- */
+/*
+ [Ross] (simplification of)
+ Set dy complying with:
+ - zero
+ - thick / 2 + staffline_f / 2
+ - thick + staffline_f
+ + n * staff_space
+*/
+Real
+Beam::quantise_dy_f (Score_element*me,Real dy)
+{
+ Array<Real> a;
- Real dx_f = stems_.top ()->hpos_f () - stems_[0]->hpos_f ();
- Real damp_correct_f = paper ()->get_var ("beam_slope_damp_correct_factor");
- Real damped_slope_dy_f = (solved_slope_f_ - slope_f_) * dx_f
- * sign (slope_f_);
- damped_slope_dy_f *= damp_correct_f;
- if (damped_slope_dy_f <= epsilon_f)
- damped_slope_dy_f = 0;
-
- DOUT << "Beam::set_stemlens: \n";
- Real x0 = stems_[0]->hpos_f ();
- Real dy_f = 0;
- // urg
- for (int jj = 0; jj < 10; jj++)
- {
- left_y_ += dy_f * dir_;
- quantise_left_y (dy_f);
- dy_f = 0;
- for (int i=0; i < stems_.size (); i++)
- {
- Stem *s = stems_[i];
- if (s->transparent_b_)
- continue;
-
- Real x = s->hpos_f () - x0;
- // urg move this to stem-info
- Real sy = left_y_ + slope_f_ * x;
- if (dir_ != s->dir_)
- sy -= dir_ * (beam_f / 2
- + (s->mult_i_ - 1) * interbeam_f) / internote_f;
- s->set_stemend (sy);
- Real y = s->stem_end_f () * dir_;
- Stem_info info (s);
- if (y > info.maxy_f_)
- dy_f = dy_f <? info.maxy_f_ - y;
- if (y < info.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 >? info.miny_f_ - y;
- }
- }
- if (damped_slope_dy_f && (dy_f >= 0))
- dy_f += damped_slope_dy_f;
- damped_slope_dy_f = 0;
- if (abs (dy_f) <= epsilon_f)
- {
- DOUT << "Beam::set_stemlens: " << jj << " iterations\n";
- break;
- }
- }
+ SCM proc = me->get_elt_property ("height-quants");
+ SCM quants = gh_call2 (proc, me->self_scm (),
+ gh_double2scm (me->paper_l ()->get_var ("stafflinethickness")
+ / 1.0));
+
+
+ for (SCM s = quants; gh_pair_p (s); s = gh_cdr (s))
+ a.push (gh_scm2double (gh_car (s)));
+
+ if (a.size () <= 1)
+ return dy;
- test_pos++;
- test_pos %= 4;
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+ Interval iv = quantise_iv (a, abs (dy)/staff_space) * staff_space;
+ Real q = (abs (dy) - iv[SMALLER] <= iv[BIGGER] - abs (dy))
+ ? iv[SMALLER]
+ : iv[BIGGER];
+
+ return q * sign (dy);
}
/*
- FIXME
- ugh. this is broken and should be rewritten.
- - [c8. c32 c32]
+ Prevent interference from stafflines and beams.
+ See Documentation/tex/fonts.doc
+
+ We only need to quantise the (left) y-position of the beam,
+ since dy is quantised too.
+ if extend_b then stems must *not* get shorter
*/
-void
-Beam::set_grouping (Rhythmic_grouping def, Rhythmic_grouping cur)
+Real
+Beam::quantise_y_f (Score_element*me,Real y, Real dy, int quant_dir)
{
- def.OK ();
- cur.OK ();
- assert (cur.children.size () == stems_.size ());
+ int multiplicity = get_multiplicity (me);
- cur.split (def);
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real thick = me->paper_l ()->get_var ("stafflinethickness");
- Array<int> b;
- {
- Array<int> flags;
- for (int j=0; j <stems_.size (); j++)
- {
- Stem *s = stems_[j];
- int f = s->flag_i_ - 2;
- assert (f>0);
- flags.push (f);
- }
- int fi =0;
- b= cur.generate_beams (flags, fi);
- b.insert (0,0);
- b.push (0);
- assert (stems_.size () == b.size ()/2);
- }
+ SCM proc = me->get_elt_property ("vertical-position-quant-function");
+ SCM quants = scm_apply (proc,
+ me->self_scm (),
+ gh_list (gh_int2scm (multiplicity),
+ gh_double2scm (dy/staff_space),
+ gh_double2scm (thick/staff_space),
+ SCM_EOL, SCM_UNDEFINED));
+
+ Array<Real> a;
+
+ for (; gh_pair_p (quants); quants = gh_cdr (quants))
+ a.push (gh_scm2double (gh_car (quants)));
+
+ if (a.size () <= 1)
+ return y;
+
+ Real up_y = Directional_element_interface::get (me) * y;
+ Interval iv = quantise_iv (a, up_y/staff_space) * staff_space;
+
+ Real q = up_y - iv[SMALLER] <= iv[BIGGER] - up_y
+ ? iv[SMALLER] : iv[BIGGER];
+ if (quant_dir)
+ q = iv[(Direction)quant_dir];
- for (int j=0, i=0; i < b.size () && j <stems_.size (); j++)
+ return q * Directional_element_interface::get (me);
+}
+
+void
+Beam::set_beaming (Score_element*me,Beaming_info_list *beaming)
+{
+ Link_array<Score_element> stems=
+ Pointer_group_interface__extract_elements (me, (Score_element*)0, "stems");
+
+ Direction d = LEFT;
+ for (int i=0; i < stems.size(); i++)
{
- Stem *s = stems_[j];
- 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);
+ do
+ {
+ if (Stem::beam_count (stems[i], d) == 0)
+ Stem::set_beaming ( stems[i], beaming->infos_.elem (i).beams_i_drul_[d],d);
+ }
+ while (flip (&d) != LEFT);
}
}
+
+
/*
beams to go with one stem.
+
+ FIXME: clean me up.
*/
Molecule
-Beam::stem_beams (Stem *here, Stem *next, Stem *prev) const
+Beam::stem_beams (Score_element*me,Item *here, Item *next, Item *prev)
{
- assert (!next || next->hpos_f () > here->hpos_f ());
- assert (!prev || prev->hpos_f () < here->hpos_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");
+
+ Real staffline_f = me->paper_l ()->get_var ("stafflinethickness");
+ int multiplicity = get_multiplicity (me);
- Real staffline_f = paper ()->rule_thickness ();
- Real interbeam_f = paper ()->interbeam_f (multiple_i_);
- Real internote_f = paper ()->internote_f ();
- Real beam_f = paper ()->beam_thickness_f ();
+ SCM space_proc = me->get_elt_property ("space-function");
+ SCM space = gh_call1 (space_proc, gh_int2scm (multiplicity));
- Real dy = interbeam_f;
+ Real thick = gh_scm2double (me->get_elt_property ("thickness")) ;
+ Real interbeam_f = gh_scm2double (space) ;
+
+ Real bdy = interbeam_f;
Real stemdx = staffline_f;
- Real sl = slope_f_* internote_f;
- lookup_l ()->beam (sl, 20 PT, 1 PT);
+
+ // ugh -> use commonx
+ Real dx = visible_stem_count (me) ?
+ last_visible_stem (me)->relative_coordinate (0, X_AXIS) - first_visible_stem (me)->relative_coordinate (0, X_AXIS)
+ : 0.0;
+ Real dy = gh_scm2double (me->get_elt_property ("height"));
+ Real dydx = dy && dx ? dy/dx : 0;
Molecule leftbeams;
Molecule rightbeams;
- // UGH
- Real nw_f = paper ()->note_width () * 0.8;
+ Real nw_f;
+ if (!Stem::first_head (here))
+ nw_f = 0;
+ else {
+ int t = Stem::type_i (here);
+
+ SCM proc = me->get_elt_property ("flag-width-function");
+ SCM result = gh_call1 (proc, gh_int2scm (t));
+ nw_f = gh_scm2double (result);
+ }
+
+ Direction dir = Directional_element_interface::get (me);
+
/* 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] ;
+ 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
*/
- Real w = here->hpos_f () - prev->hpos_f ();
+ Real w = here->relative_coordinate (0, X_AXIS) - prev->relative_coordinate (0, X_AXIS);
w = w/2 <? nw_f;
- Atom a;
+ 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, thick);
+ a.translate (Offset (-w, -w * dydx));
for (int j = 0; j < lhalfs; j++)
{
- Atom b (a);
- b.translate_axis (-dir_ * dy * (lwholebeams+j), Y_AXIS);
- leftbeams.add_atom (b);
+ Molecule b (a);
+ 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->hpos_f () - here->hpos_f ();
- Atom a = lookup_l ()->beam (sl, w + stemdx, beam_f);
+ Real w = next->relative_coordinate (0, X_AXIS) - here->relative_coordinate (0, X_AXIS);
+ Molecule a = Lookup::beam (dydx, w + stemdx, thick);
a.translate_axis( - stemdx/2, X_AXIS);
int j = 0;
Real gap_f = 0;
- if (here->beam_gap_i_)
+
+ SCM gap = me->get_elt_property ("gap");
+ if (gh_number_p (gap))
{
- int nogap = rwholebeams - here->beam_gap_i_;
+ int gap_i = gh_scm2int ( (gap));
+ int nogap = rwholebeams - gap_i;
+
for (; j < nogap; j++)
{
- Atom b (a);
- b.translate_axis (-dir_ * dy * j, Y_AXIS);
- rightbeams.add_atom (b);
+ Molecule b (a);
+ b.translate_axis (-dir * bdy * 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);
+ a = Lookup::beam (dydx, w + stemdx, thick);
}
for (; j < rwholebeams; j++)
{
- Atom b (a);
- b.translate (Offset (gap_f, -dir_ * dy * j));
- rightbeams.add_atom (b);
+ Molecule b (a);
+ b.translate (Offset (Stem::invisible_b (here) ? 0 : gap_f, -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++)
{
- Atom b (a);
- b.translate_axis (-dir_ * dy * j, Y_AXIS);
- rightbeams.add_atom (b);
+ Molecule b (a);
+ b.translate_axis (- dir * bdy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
}
}
return leftbeams;
}
+MAKE_SCHEME_CALLBACK(Beam,brew_molecule,1);
+SCM
+Beam::brew_molecule (SCM smob)
+{
+ Score_element * me =unsmob_element (smob);
+
+ Molecule mol;
+ if (!gh_pair_p (me->get_elt_property ("stems")))
+ return SCM_EOL;
+ Real x0,dx;
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (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;
+ }
+
+
+ Real dy = gh_scm2double (me->get_elt_property ("height"));
+ Real dydx = dy && dx ? dy/dx : 0;
+ Real y = gh_scm2double (me->get_elt_property ("y-position"));
+
+
+ for (int j=0; j <stems.size (); j++)
+ {
+ Item *i = stems[j];
+ Item * prev = (j > 0)? stems[j-1] : 0;
+ Item * next = (j < stems.size()-1) ? stems[j+1] :0;
+
+ Molecule sb = stem_beams (me, i, next, prev);
+ Real x = i->relative_coordinate (0, X_AXIS)-x0;
+ sb.translate (Offset (x, x * dydx + y));
+ mol.add_molecule (sb);
+ }
+ mol.translate_axis (x0
+ - dynamic_cast<Spanner*> (me)->get_bound (LEFT)->relative_coordinate (0, X_AXIS), X_AXIS);
+
+ return mol.smobbed_copy ();
+}
+
+int
+Beam::forced_stem_count (Score_element*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements ( 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 (Score_element*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (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(Score_element*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements ( 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(Score_element*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements ( 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)
+{
+ Score_element *rest = unsmob_element (element_smob);
+ Axis a = (Axis) gh_scm2int (axis);
+
+ assert (a == Y_AXIS);
+
+ Score_element * st = unsmob_element (rest->get_elt_property ("stem"));
+ Score_element * stem = st;
+ if (!stem)
+ return gh_double2scm (0.0);
+ Score_element * beam = unsmob_element (stem->get_elt_property ("beam"));
+ if (!beam || !Beam::has_interface (beam) || !Beam::visible_stem_count (beam))
+ return gh_double2scm (0.0);
+
+ // make callback for rest from this.
+ Real beam_dy = 0;
+ Real beam_y = 0;
+
+
+ // todo: make sure this calced already.
+ SCM s = beam->get_elt_property ("height");
+ if (gh_number_p (s))
+ beam_dy = gh_scm2double (s);
+
+ s = beam->get_elt_property ("y-position");
+ if (gh_number_p (s))
+ beam_y = gh_scm2double (s);
+
+ // 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 = beam_dy && dx ? beam_dy/dx : 0;
+
+ Direction d = Stem::get_direction (stem);
+ Real beamy = (stem->relative_coordinate (0, X_AXIS) - x0) * dydx + beam_y;
+
+ 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_elt_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 (Score_element*me)
+{
+ return me->has_interface (ly_symbol2scm ("beam-interface"));
+}
+
+void
+Beam::set_interface (Score_element*me)
+{
+ /*
+ why the init? No way to tell difference between default and user
+ override. */
+ me->set_elt_property ("height", gh_int2scm (0)); // ugh.
+ me->set_elt_property ("y-position" ,gh_int2scm (0));
+ me->set_interface (ly_symbol2scm("beam-interface"));
+}
projects / lilypond.git / blobdiff