-/*
- beam.cc -- implement Beam
-
- source file of the GNU LilyPond music typesetter
-
- (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
- Jan Nieuwenhuizen <janneke@gnu.org>
-
-*/
-
-/*
- [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.
-
- * Rewrite stem_beams.
-
- */
-
-
-#include <math.h> // tanh.
-
-#include "molecule.hh"
-#include "directional-element-interface.hh"
-#include "beaming.hh"
-#include "new-beam.hh"
-#include "misc.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"
-
-void
-New_beam::add_stem (Grob *me, Grob *s)
-{
- Pointer_group_interface::add_grob (me, ly_symbol2scm ("stems"), s);
-
- s->add_dependency (me);
-
- assert (!Stem::beam_l (s));
- s->set_grob_property ("beam", me->self_scm ());
-
- add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
-}
-
-int
-New_beam::get_multiplicity (Grob *me)
-{
- int m = 0;
- for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
- {
- Grob *sc = unsmob_grob (ly_car (s));
-
- if (Stem::has_interface (sc))
- m = m >? Stem::beam_count (sc, LEFT) >? Stem::beam_count (sc, RIGHT);
- }
- return m;
-}
-
-/* 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 (New_beam, before_line_breaking, 1);
-SCM
-New_beam::before_line_breaking (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- /* 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. */
-
- int count = visible_stem_count (me);
- if (count < 2)
- {
- me->warning (_ ("beam has less than two visible stems"));
-
- SCM stems = me->get_grob_property ("stems");
- if (scm_ilength (stems) == 1)
- {
- me->warning (_ ("Beam has less than two stems. Removing beam."));
-
- 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 (count >= 1)
- {
- 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 SCM_EOL;
-}
-
-Direction
-New_beam::get_default_dir (Grob *me)
-{
- 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);
-
- /* 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
-New_beam::set_stem_directions (Grob *me)
-{
- Link_array<Item> stems
- =Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
- Direction d = Directional_element_interface::get (me);
-
- 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);
- }
-}
-
-/* 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
-New_beam::consider_auto_knees (Grob *me)
-{
- SCM scm = me->get_grob_property ("auto-knee-gap");
-
- if (gh_number_p (scm))
- {
- 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);
-
- 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;
-
- 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);
- }
- }
- }
-}
-
-/* Set stem's shorten property if unset.
- TODO:
- take some y-position (chord/beam/nearest?) into account
- scmify forced-fraction */
-void
-New_beam::set_stem_shorten (Grob *m)
-{
- 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));
-}
-
-/* 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 (New_beam, after_line_breaking, 1);
-SCM
-New_beam::after_line_breaking (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- /* Copy to mutable list. */
- SCM s = ly_deep_copy (me->get_grob_property ("position"));
- me->set_grob_property ("position", 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;
-}
-
-
-MAKE_SCHEME_CALLBACK (New_beam, least_squares, 1);
-SCM
-New_beam::least_squares (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- int count = visible_stem_count (me);
- if (count <= 1)
- return SCM_UNSPECIFIED;
-
- Direction dir = Directional_element_interface::get (me);
-
- Interval pos (0, 0);
- 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 ())
- {
- Interval chord (Stem::chord_start_f (first_visible_stem (me)),
- Stem::chord_start_f (last_visible_stem (me)));
-
- /* Make simple beam on middle line have small tilt */
- if (!ideal[LEFT] && chord.delta () && count == 2)
- {
- 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;
- }
- else
- {
- Array<Offset> ideals;
-
- // 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_));
- }
- 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;
- pos = Interval (y*dir, (y+dy) * dir);
- }
-
- me->set_grob_property ("position", ly_interval2scm (pos));
- return SCM_UNSPECIFIED;
-}
-
-MAKE_SCHEME_CALLBACK (New_beam, check_concave, 1);
-SCM
-New_beam::check_concave (SCM smob)
-{
- 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 ();)
- {
- if (Stem::invisible_b (stems[i]))
- stems.del (i);
- else
- i++;
- }
-
- 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++)
- {
- 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;
- }
- concave *= Directional_element_interface::get (me);
-
- 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"));
-
- /* TODO: some sort of damping iso -> plain horizontal */
- if (concaveness > r)
- {
- Interval pos = ly_scm2interval (me->get_grob_property ("position"));
- Real r = pos.linear_combination (0);
- me->set_grob_property ("position", ly_interval2scm (Interval (r, r)));
- }
-
- return SCM_UNSPECIFIED;
-}
-
-/* This neat trick is by Werner Lemberg,
- damped = tanh (slope)
- corresponds with some tables in [Wanske] CHECKME */
-MAKE_SCHEME_CALLBACK (New_beam, slope_damping, 1);
-SCM
-New_beam::slope_damping (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- if (visible_stem_count (me) <= 1)
- return SCM_UNSPECIFIED;
-
- SCM s = me->get_grob_property ("damping");
- int damping = gh_scm2int (s);
-
- if (damping)
- {
- Interval pos = ly_scm2interval (me->get_grob_property ("position"));
- 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 ("position", ly_interval2scm (pos));
- }
- return SCM_UNSPECIFIED;
-}
-
-
-/* Prevent interference from stafflines. */
-Interval
-New_beam::quantise_interval (Grob *me, Interval pos, Direction quant_dir)
-{
- int multiplicity = get_multiplicity (me);
-
- Real staff_space = Staff_symbol_referencer::staff_space (me);
- Real thick = me->paper_l ()->get_var ("stafflinethickness");
-
- SCM proc = me->get_grob_property ("vertical-position-quant-function");
- SCM quants = scm_apply (proc,
- me->self_scm (),
- scm_list_n (gh_int2scm (multiplicity),
- gh_double2scm (1), /* junkme */
- 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;
-
- Direction dir = Directional_element_interface::get (me);
- Interval left = quantise_iv (a, pos[LEFT]*dir/staff_space) * staff_space;
- Interval right = quantise_iv (a, pos[RIGHT]*dir/staff_space) * staff_space;
-
- Real dy = pos.delta ();
- Real ady = abs (dy);
-
- // quant direction hints disabled for now
- int q = 0;//(int)quant_dir;
-
- /* TODO: make smart choice, find best left/right quants pair.
-
- Slope should never be steeper than least_squares (before damping)
- (save that value?)
- Slope should never be reduced to zero.
- */
- Interval qpos (0, 20.0 *sign (dy));
- Direction ldir = LEFT;
- do
- {
- Direction rdir = LEFT;
- do
- {
- Interval i (left[ldir]*dir, right[rdir]*dir);
- if ((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);
-
- return qpos;
-}
-
-
-/* Quantise vertical position (left and right) of beam.
- Generalisation of [Ross]. */
-MAKE_SCHEME_CALLBACK (New_beam, quantise_position, 1);
-SCM
-New_beam::quantise_position (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- Interval pos = ly_scm2interval (me->get_grob_property ("position"));
- Real y_shift = check_stem_length_f (me, pos);
- pos += y_shift;
- pos = quantise_interval (me, pos, CENTER);
-
- me->set_grob_property ("position", ly_interval2scm (pos));
- set_stem_lengths (me);
-
- pos = ly_scm2interval (me->get_grob_property ("position"));
-
- 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);
- }
-
- me->set_grob_property ("position", ly_interval2scm (pos));
-
- return SCM_UNSPECIFIED;
-}
-
-MAKE_SCHEME_CALLBACK (New_beam, end_after_line_breaking, 1);
-SCM
-New_beam::end_after_line_breaking (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
- set_stem_lengths (me);
-
- return SCM_UNSPECIFIED;
-}
-
-Real
-New_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;
- }
-
- return stem_y;
-}
-
-/* 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
-New_beam::check_stem_length_f (Grob *me, Interval pos)
-{
- Real shorten = 0;
- Real lengthen = 0;
- Direction dir = Directional_element_interface::get (me);
-
- Link_array<Item> stems=
- Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
-
- bool knee = false;
- int ideal_lengthen_count = 0;
- Real ideal_lengthen = 0;
- int ideal_shorten_count = 0;
- Real ideal_shorten = 0;
-
- for (int i=0; i < stems.size (); i++)
- {
- Item* s = stems[i];
- if (Stem::invisible_b (s))
- continue;
-
- knee |= dir != Directional_element_interface::get (s);
-
- 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;
-
- if (info.idealy_f_ - stem_y > 0)
- {
- ideal_lengthen += info.idealy_f_ - stem_y;
- ideal_lengthen_count++;
- }
- else if (info.idealy_f_ - stem_y < 0)
- {
- ideal_shorten += info.idealy_f_ - stem_y;
- ideal_shorten_count++;
- }
- }
-
- if (lengthen && shorten)
- me->warning (_ ("weird beam vertical offset"));
-
- if (ideal_lengthen_count)
- lengthen = (ideal_lengthen / ideal_lengthen_count) >? lengthen;
- if (knee && ideal_shorten_count)
- shorten = (ideal_shorten / ideal_shorten_count) <? shorten;
-
- 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
-New_beam::set_stem_lengths (Grob *me)
-{
- 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 ("position"));
- 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;
-
- 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
-New_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++)
- {
- do
- {
- /* 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);
- }
-}
-
-
-
-/*
- beams to go with one stem.
-
- FIXME: clean me up.
- */
-Molecule
-New_beam::stem_beams (Grob *me, Item *here, Item *next, Item *prev, Real dydx)
-{
- // 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;
-
- Real nw_f;
- if (!Stem::first_head (here))
- nw_f = 0;
- 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 = 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::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 * bdy * (lwholebeams+j), Y_AXIS);
- leftbeams.add_molecule (b);
- }
- }
-
- if (next)
- {
- 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");
-
- 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 = me->get_grob_property ("gap");
- if (gh_number_p (gap))
- {
- int gap_i = gh_scm2int ((gap));
- int nogap = rwholebeams - gap_i;
-
- for (; j < nogap; j++)
- {
- Molecule b (a);
- b.translate_axis (-dir * bdy * j, Y_AXIS);
- rightbeams.add_molecule (b);
- }
- if (Stem::invisible_b (here))
- gap_f = nw_f;
- else
- gap_f = nw_f / 2;
- w -= 2 * gap_f;
- a = Lookup::beam (dydx, w + stem_w, thick);
- }
-
- for (; j < rwholebeams; j++)
- {
- Molecule b (a);
- 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
- tx = gap_f;
- b.translate (Offset (tx, -dir * bdy * j));
- rightbeams.add_molecule (b);
- }
-
- w = w/2 <? nw_f;
- if (rhalfs)
- a = Lookup::beam (dydx, w, thick);
-
- for (; j < rwholebeams + rhalfs; j++)
- {
- Molecule b (a);
- 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. */
- return leftbeams;
-}
-
-MAKE_SCHEME_CALLBACK (New_beam, brew_molecule, 1);
-SCM
-New_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 ("position"));
- 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);
-
- return mol.smobbed_copy ();
-}
-
-int
-New_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
-New_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*
-New_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*
-New_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 (New_beam, rest_collision_callback, 2);
-SCM
-New_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
- || !New_beam::has_interface (beam)
- || !New_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 ("position"));
- Interval pos (0, 0);
- SCM s = beam->get_grob_property ("position");
- if (gh_pair_p (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
-New_beam::has_interface (Grob *me)
-{
- return me->has_interface (ly_symbol2scm ("beam-interface"));
-}
-
projects / lilypond.git / blobdiff