/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
LilyPond is free software: you can redistribute it and/or modify
#include "beam.hh"
+#include "axis-group-interface.hh"
#include "align-interface.hh"
#include "beam-scoring-problem.hh"
#include "beaming-pattern.hh"
#include "international.hh"
#include "interval-set.hh"
#include "item.hh"
-#include "least-squares.hh"
#include "lookup.hh"
#include "main.hh"
#include "misc.hh"
typedef map<int, vector<Beam_stem_segment> > Position_stem_segments_map;
-// TODO - should store result in a property?
-vector<Beam_segment>
-Beam::get_beam_segments (Grob *me_grob, Grob **common)
+MAKE_SCHEME_CALLBACK (Beam, calc_beam_segments, 1);
+SCM
+Beam::calc_beam_segments (SCM smob)
{
/* ugh, this has a side-effect that we need to ensure that
Stem #'beaming is correct */
+ Grob *me_grob = unsmob_grob (smob);
(void) me_grob->get_property ("beaming");
Spanner *me = dynamic_cast<Spanner *> (me_grob);
extract_grob_set (me, "stems", stems);
- Grob *commonx = common_refpoint_of_array (stems, me, X_AXIS);
- commonx = me->get_bound (LEFT)->common_refpoint (commonx, X_AXIS);
- commonx = me->get_bound (RIGHT)->common_refpoint (commonx, X_AXIS);
-
- *common = commonx;
+ Grob *commonx = common_refpoint_of_array (stems, me, X_AXIS);
+ Direction d = LEFT;
+ do
+ commonx = me->get_bound (d)->common_refpoint (commonx, X_AXIS);
+ while (flip (&d) != LEFT);
int gap_count = robust_scm2int (me->get_property ("gap-count"), 0);
Real gap_length = robust_scm2double (me->get_property ("gap"), 0.0);
Real stem_width = robust_scm2double (stem->get_property ("thickness"), 1.0) * lt;
Real stem_x = stem->relative_coordinate (commonx, X_AXIS);
SCM beaming = stem->get_property ("beaming");
- Direction d = LEFT;
+
do
{
// Find the maximum and minimum beam ranks.
|| abs (vertical_count) >= neighbor_seg.max_connect_);
if (!event)
- // Then this edge of the current segment is irrelevent because it will
+ // Then this edge of the current segment is irrelevant because it will
// be connected with the next segment in the event_dir direction.
+ // If we skip the left edge here, the right edge of
+ // the previous segment has already been skipped since
+ // the conditions are symmetric
continue;
current.vertical_count_ = vertical_count;
&& me->get_bound (event_dir)->break_status_dir ())
{
current.horizontal_[event_dir]
- = (robust_relative_extent (me->get_bound (event_dir),
- commonx, X_AXIS)[RIGHT]
+ = (Axis_group_interface::generic_bound_extent (me->get_bound (event_dir),
+ commonx, X_AXIS)[RIGHT]
+ event_dir * break_overshoot[event_dir]);
}
else
}
+ SCM segments_scm = SCM_EOL;
+ SCM *tail = &segments_scm;
+
+ for (vsize i = 0; i < segments.size (); i++)
+ {
+ *tail = scm_cons (scm_list_2 (scm_cons (ly_symbol2scm ("vertical-count"),
+ scm_from_int (segments[i].vertical_count_)),
+ scm_cons (ly_symbol2scm ("horizontal"),
+ ly_interval2scm (segments[i].horizontal_))),
+ SCM_EOL);
+ tail = SCM_CDRLOC (*tail);
+ }
+
+ return segments_scm;
+}
+
+MAKE_SCHEME_CALLBACK (Beam, calc_x_positions, 1);
+SCM
+Beam::calc_x_positions (SCM smob)
+{
+ Spanner *me = unsmob_spanner (smob);
+ SCM segments = me->get_property ("beam-segments");
+ Interval x_positions;
+ x_positions.set_empty ();
+ for (SCM s = segments; scm_is_pair (s); s = scm_cdr (s))
+ x_positions.unite (robust_scm2interval (ly_assoc_get (ly_symbol2scm ("horizontal"),
+ scm_car (s),
+ SCM_EOL),
+ Interval (0.0, 0.0)));
+
+ // Case for beams without segments (i.e. uniting two skips with a beam)
+ // TODO: should issue a warning? warning likely issued downstream, but couldn't hurt...
+ if (x_positions.is_empty ())
+ {
+ extract_grob_set (me, "stems", stems);
+ Grob *common_x = common_refpoint_of_array (stems, me, X_AXIS);
+ Direction d = LEFT;
+ do
+ x_positions[d] = me->relative_coordinate (common_x, X_AXIS);
+ while (flip (&d) != LEFT);
+ }
+ return ly_interval2scm (x_positions);
+}
+
+vector<Beam_segment>
+Beam::get_beam_segments (Grob *me)
+{
+ SCM segments_scm = me->get_property ("beam-segments");
+ vector<Beam_segment> segments;
+ for (SCM s = segments_scm; scm_is_pair (s); s = scm_cdr (s))
+ {
+ segments.push_back (Beam_segment ());
+ segments.back ().vertical_count_ = robust_scm2int (ly_assoc_get (ly_symbol2scm ("vertical-count"), scm_car (s), SCM_EOL), 0);
+ segments.back ().horizontal_ = robust_scm2interval (ly_assoc_get (ly_symbol2scm ("horizontal"), scm_car (s), SCM_EOL), Interval (0.0, 0.0));
+ }
+
return segments;
}
Beam::print (SCM grob)
{
Spanner *me = unsmob_spanner (grob);
- Grob *commonx = 0;
- vector<Beam_segment> segments = get_beam_segments (me, &commonx);
+ /*
+ TODO - mild code dup for all the commonx calls.
+ Some use just common_refpoint_of_array, some (in print and
+ calc_beam_segments) use this plus calls to get_bound.
+
+ Figure out if there is any particular reason for this and
+ consolidate in one Beam::get_common function.
+ */
+ extract_grob_set (me, "stems", stems);
+ Grob *commonx = common_refpoint_of_array (stems, me, X_AXIS);
+ Direction d = LEFT;
+ do
+ commonx = me->get_bound (d)->common_refpoint (commonx, X_AXIS);
+ while (flip (&d) != LEFT);
+
+ vector<Beam_segment> segments = get_beam_segments (me);
+
if (!segments.size ())
return SCM_EOL;
- Interval span;
- if (normal_stem_count (me))
- {
- span[LEFT] = first_normal_stem (me)->relative_coordinate (commonx, X_AXIS);
- span[RIGHT] = last_normal_stem (me)->relative_coordinate (commonx, X_AXIS);
- }
- else
- {
- extract_grob_set (me, "stems", stems);
- span[LEFT] = stems[0]->relative_coordinate (commonx, X_AXIS);
- span[RIGHT] = stems.back ()->relative_coordinate (commonx, X_AXIS);
- }
-
Real blot = me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
SCM posns = me->get_property ("quantized-positions");
+ Interval span = robust_scm2interval (me->get_property ("X-positions"), Interval (0, 0));
Interval pos;
if (!is_number_pair (posns))
{
Interval placements = robust_scm2interval (me->get_property ("normalized-endpoints"), Interval (0.0, 0.0));
Stencil the_beam;
-
int extreme = (segments[0].vertical_count_ == 0
? segments[0].vertical_count_
: segments.back ().vertical_count_);
}
}
-/* Set stem's shorten property if unset.
-
-TODO:
-take some y-position (chord/beam/nearest?) into account
-scmify forced-fraction
-
-This is done in beam because the shorten has to be uniform over the
-entire beam.
-*/
-
-void
-set_minimum_dy (Grob *me, Real *dy)
-{
- if (*dy)
- {
- /*
- If dy is smaller than the smallest quant, we
- get absurd direction-sign penalties.
- */
-
- Real ss = Staff_symbol_referencer::staff_space (me);
- Real beam_thickness = Beam::get_beam_thickness (me) / ss;
- Real slt = Staff_symbol_referencer::line_thickness (me) / ss;
- Real sit = (beam_thickness - slt) / 2;
- Real inter = 0.5;
- Real hang = 1.0 - (beam_thickness - slt) / 2;
-
- *dy = sign (*dy) * max (fabs (*dy),
- min (min (sit, inter), hang));
- }
-}
-
MAKE_SCHEME_CALLBACK (Beam, calc_stem_shorten, 1)
SCM
Beam::calc_stem_shorten (SCM smob)
return scm_from_double (0.0);
}
-Interval
-Beam::no_visible_stem_positions (Grob *me, Interval default_value)
-{
- extract_grob_set (me, "stems", stems);
- if (stems.empty ())
- return default_value;
-
- Interval head_positions;
- Slice multiplicity;
- for (vsize i = 0; i < stems.size (); i++)
- {
- head_positions.unite (Stem::head_positions (stems[i]));
- multiplicity.unite (Stem::beam_multiplicity (stems[i]));
- }
-
- Direction dir = get_grob_direction (me);
-
- if (!dir)
- programming_error ("The beam should have a direction by now.");
-
- Real y = head_positions.linear_combination (dir)
- * 0.5 * Staff_symbol_referencer::staff_space (me)
- + dir * get_beam_translation (me) * (multiplicity.length () + 1);
-
- y /= Staff_symbol_referencer::staff_space (me);
- return Interval (y, y);
-}
-
-/*
- Compute a first approximation to the beam slope.
-*/
-MAKE_SCHEME_CALLBACK (Beam, calc_least_squares_positions, 2);
-SCM
-Beam::calc_least_squares_positions (SCM smob, SCM /* posns */)
-{
- Grob *me = unsmob_grob (smob);
-
- int count = normal_stem_count (me);
- Interval pos (0, 0);
- if (count < 1)
- return ly_interval2scm (no_visible_stem_positions (me, pos));
-
- vector<Real> x_posns;
- extract_grob_set (me, "normal-stems", stems);
- Grob *commonx = common_refpoint_of_array (stems, me, X_AXIS);
- Grob *commony = common_refpoint_of_array (stems, me, Y_AXIS);
-
- Real my_y = me->relative_coordinate (commony, Y_AXIS);
-
- Grob *fvs = first_normal_stem (me);
- Grob *lvs = last_normal_stem (me);
-
- Interval ideal (Stem::get_stem_info (fvs).ideal_y_
- + fvs->relative_coordinate (commony, Y_AXIS) - my_y,
- Stem::get_stem_info (lvs).ideal_y_
- + lvs->relative_coordinate (commony, Y_AXIS) - my_y);
-
- Real x0 = first_normal_stem (me)->relative_coordinate (commonx, X_AXIS);
- for (vsize i = 0; i < stems.size (); i++)
- {
- Grob *s = stems[i];
-
- Real x = s->relative_coordinate (commonx, X_AXIS) - x0;
- x_posns.push_back (x);
- }
- Real dx = last_normal_stem (me)->relative_coordinate (commonx, X_AXIS) - x0;
-
- Real y = 0;
- Real slope = 0;
- Real dy = 0;
- Real ldy = 0.0;
- if (!ideal.delta ())
- {
- Interval chord (Stem::chord_start_y (stems[0]),
- Stem::chord_start_y (stems.back ()));
-
- /* Simple beams (2 stems) on middle line should be allowed to be
- slightly sloped.
-
- However, if both stems reach middle line,
- ideal[LEFT] == ideal[RIGHT] and ideal.delta () == 0.
-
- For that case, we apply artificial slope */
- if (!ideal[LEFT] && chord.delta () && count == 2)
- {
- /* FIXME. -> UP */
- Direction d = (Direction) (sign (chord.delta ()) * UP);
- pos[d] = get_beam_thickness (me) / 2;
- pos[-d] = -pos[d];
- }
- else
- pos = ideal;
-
- /*
- For broken beams this doesn't work well. In this case, the
- slope esp. of the first part of a broken beam should predict
- where the second part goes.
- */
- ldy = pos[RIGHT] - pos[LEFT];
- }
- else
- {
- vector<Offset> ideals;
- for (vsize i = 0; i < stems.size (); i++)
- {
- Grob *s = stems[i];
- ideals.push_back (Offset (x_posns[i],
- Stem::get_stem_info (s).ideal_y_
- + s->relative_coordinate (commony, Y_AXIS)
- - my_y));
- }
-
- minimise_least_squares (&slope, &y, ideals);
-
- dy = slope * dx;
-
- set_minimum_dy (me, &dy);
-
- ldy = dy;
- pos = Interval (y, (y + dy));
- }
-
- /*
- "position" is relative to the staff.
- */
- scale_drul (&pos, 1 / Staff_symbol_referencer::staff_space (me));
-
- me->set_property ("least-squares-dy", scm_from_double (ldy));
- return ly_interval2scm (pos);
-}
-
-// Assuming V is not empty, pick a 'reasonable' point inside V.
-static Real
-point_in_interval (Interval v, Real dist)
-{
- if (isinf (v[DOWN]))
- return v[UP] - dist;
- else if (isinf (v[UP]))
- return v[DOWN] + dist;
- else
- return v.center ();
-}
-
-/*
- We can't combine with previous function, since check concave and
- slope damping comes first.
-
- TODO: we should use the concaveness to control the amount of damping
- applied.
-*/
-MAKE_SCHEME_CALLBACK (Beam, shift_region_to_valid, 2);
-SCM
-Beam::shift_region_to_valid (SCM grob, SCM posns)
-{
- Grob *me = unsmob_grob (grob);
-
- /*
- Code dup.
- */
- vector<Real> x_posns;
- extract_grob_set (me, "stems", stems);
- extract_grob_set (me, "covered-grobs", covered);
-
- Grob *common[NO_AXES] = { me, me };
- for (Axis a = X_AXIS; a < NO_AXES; incr (a))
- {
- common[a] = common_refpoint_of_array (stems, me, a);
- common[a] = common_refpoint_of_array (covered, common[a], a);
- }
- Grob *fvs = first_normal_stem (me);
-
- if (!fvs)
- return posns;
- Interval x_span;
- x_span[LEFT] = fvs->relative_coordinate (common[X_AXIS], X_AXIS);
- for (vsize i = 0; i < stems.size (); i++)
- {
- Grob *s = stems[i];
-
- Real x = s->relative_coordinate (common[X_AXIS], X_AXIS) - x_span[LEFT];
- x_posns.push_back (x);
- }
-
- Grob *lvs = last_normal_stem (me);
- x_span[RIGHT] = lvs->relative_coordinate (common[X_AXIS], X_AXIS);
-
- Drul_array<Real> pos = ly_scm2interval (posns);
-
- scale_drul (&pos, Staff_symbol_referencer::staff_space (me));
-
- Real beam_dy = pos[RIGHT] - pos[LEFT];
- Real beam_left_y = pos[LEFT];
- Real slope = x_span.delta () ? (beam_dy / x_span.delta ()) : 0.0;
-
- /*
- Shift the positions so that we have a chance of finding good
- quants (i.e. no short stem failures.)
- */
- Interval feasible_left_point;
- feasible_left_point.set_full ();
-
- for (vsize i = 0; i < stems.size (); i++)
- {
- Grob *s = stems[i];
- if (Stem::is_invisible (s))
- continue;
-
- Direction d = get_grob_direction (s);
- Real left_y
- = Stem::get_stem_info (s).shortest_y_
- - slope * x_posns [i];
-
- /*
- left_y is now relative to the stem S. We want relative to
- ourselves, so translate:
- */
- left_y
- += + s->relative_coordinate (common[Y_AXIS], Y_AXIS)
- - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
-
- Interval flp;
- flp.set_full ();
- flp[-d] = left_y;
-
- feasible_left_point.intersect (flp);
- }
-
- vector<Grob *> filtered;
- /*
- We only update these for objects that are too large for quanting
- to find a workaround. Typically, these are notes with
- stems, and timesig/keysig/clef, which take out the entire area
- inside the staff as feasible.
-
- The code below disregards the thickness and multiplicity of the
- beam. This should not be a problem, as the beam quanting will
- take care of computing the impact those exactly.
- */
- Real min_y_size = 2.0;
-
- // A list of intervals into which beams may not fall
- vector<Interval> forbidden_intervals;
-
- for (vsize i = 0; i < covered.size (); i++)
- {
- if (!covered[i]->is_live ())
- continue;
-
- if (Beam::has_interface (covered[i]) && is_cross_staff (covered[i]))
- continue;
-
- Box b;
- for (Axis a = X_AXIS; a < NO_AXES; incr (a))
- b[a] = covered[i]->extent (common[a], a);
-
- if (b[X_AXIS].is_empty () || b[Y_AXIS].is_empty ())
- continue;
-
- if (intersection (b[X_AXIS], x_span).is_empty ())
- continue;
-
- filtered.push_back (covered[i]);
- Grob *head_stem = Rhythmic_head::get_stem (covered[i]);
- if (head_stem && Stem::is_normal_stem (head_stem)
- && Note_head::has_interface (covered[i]))
- {
- if (Stem::get_beam (head_stem))
- {
- /*
- We must assume that stems are infinitely long in this
- case, as asking for the length of the stem typically
- leads to circular dependencies.
-
- This strategy assumes that we don't want to handle the
- collision of beams in opposite non-forced directions
- with this code, where shortening the stems of both
- would resolve the problem, eg.
-
- x x
- | |
- =====
-
- =====
- | |
- x x
-
- Such beams would need a coordinating grob to resolve
- the collision, since both will likely want to occupy
- the centerline.
- */
- Direction stemdir = get_grob_direction (head_stem);
- b[Y_AXIS][stemdir] = stemdir * infinity_f;
- }
- else
- {
- // TODO - should we include the extent of the stem here?
- }
- }
-
- if (b[Y_AXIS].length () < min_y_size)
- continue;
-
- Direction d = LEFT;
- do
- {
- Real x = b[X_AXIS][d] - x_span[LEFT];
- Real dy = slope * x;
-
- Direction yd = DOWN;
- Interval disallowed;
- do
- {
- Real left_y = b[Y_AXIS][yd];
-
- left_y -= dy;
-
- // Translate back to beam as ref point.
- left_y -= me->relative_coordinate (common[Y_AXIS], Y_AXIS);
-
- disallowed[yd] = left_y;
- }
- while (flip (&yd) != DOWN);
-
- forbidden_intervals.push_back (disallowed);
- }
- while (flip (&d) != LEFT);
- }
-
- Grob_array *arr
- = Pointer_group_interface::get_grob_array (me,
- ly_symbol2scm ("covered-grobs"));
- arr->set_array (filtered);
-
- vector_sort (forbidden_intervals, Interval::left_less);
- Real epsilon = 1.0e-10;
- Interval feasible_beam_placements (beam_left_y, beam_left_y);
-
- /*
- forbidden_intervals contains a vector of intervals in which
- the beam cannot start. it iterates through these intervals,
- pushing feasible_beam_placements epsilon over or epsilon under a
- collision. when this type of change happens, the loop is marked
- as "dirty" and re-iterated.
-
- TODO: figure out a faster ways that this loop can happen via
- a better search algorithm and/or OOP.
- */
-
- bool dirty = false;
- do
- {
- dirty = false;
- for (vsize i = 0; i < forbidden_intervals.size (); i++)
- {
- Direction d = DOWN;
- do
- {
- if (forbidden_intervals[i][d] == d * infinity_f)
- feasible_beam_placements[d] = d * infinity_f;
- else if (forbidden_intervals[i].contains (feasible_beam_placements[d]))
- {
- feasible_beam_placements[d] = d * epsilon + forbidden_intervals[i][d];
- dirty = true;
- }
- }
- while (flip (&d) != DOWN);
- }
- }
- while (dirty);
-
- // if the beam placement falls out of the feasible region, we push it
- // to infinity so that it can never be a feasible candidate below
- Direction d = DOWN;
- do
- {
- if (!feasible_left_point.contains (feasible_beam_placements[d]))
- feasible_beam_placements[d] = d * infinity_f;
- }
- while (flip (&d) != DOWN);
-
- if ((feasible_beam_placements[UP] == infinity_f && feasible_beam_placements[DOWN] == -infinity_f) && !feasible_left_point.is_empty ())
- {
- // We are somewhat screwed: we have a collision, but at least
- // there is a way to satisfy stem length constraints.
- beam_left_y = point_in_interval (feasible_left_point, 2.0);
- }
- else if (!feasible_left_point.is_empty ())
- {
- // Only one of them offers is feasible solution. Pick that one.
- if (abs (beam_left_y - feasible_beam_placements[DOWN]) > abs (beam_left_y - feasible_beam_placements[UP]))
- beam_left_y = feasible_beam_placements[UP];
- else
- beam_left_y = feasible_beam_placements[DOWN];
- }
- else
- {
- // We are completely screwed.
- me->warning (_ ("no viable initial configuration found: may not find good beam slope"));
- }
-
- pos = Drul_array<Real> (beam_left_y, (beam_left_y + beam_dy));
- scale_drul (&pos, 1 / Staff_symbol_referencer::staff_space (me));
-
- return ly_interval2scm (pos);
-}
-
-/* This neat trick is by Werner Lemberg,
- damped = tanh (slope)
- corresponds with some tables in [Wanske] CHECKME */
-MAKE_SCHEME_CALLBACK (Beam, slope_damping, 2);
+MAKE_SCHEME_CALLBACK (Beam, quanting, 3);
SCM
-Beam::slope_damping (SCM smob, SCM posns)
+Beam::quanting (SCM smob, SCM ys_scm, SCM align_broken_intos)
{
Grob *me = unsmob_grob (smob);
- Drul_array<Real> pos = ly_scm2interval (posns);
-
- if (normal_stem_count (me) <= 1)
- return posns;
-
- SCM s = me->get_property ("damping");
- Real damping = scm_to_double (s);
- Real concaveness = robust_scm2double (me->get_property ("concaveness"), 0.0);
- if (concaveness >= 10000)
- {
- pos[LEFT] = pos[RIGHT];
- me->set_property ("least-squares-dy", scm_from_double (0));
- damping = 0;
- }
-
- if (damping)
- {
- scale_drul (&pos, Staff_symbol_referencer::staff_space (me));
-
- Real dy = pos[RIGHT] - pos[LEFT];
-
- Grob *fvs = first_normal_stem (me);
- Grob *lvs = last_normal_stem (me);
-
- Grob *commonx = fvs->common_refpoint (lvs, X_AXIS);
-
- Real dx = last_normal_stem (me)->relative_coordinate (commonx, X_AXIS)
- - first_normal_stem (me)->relative_coordinate (commonx, X_AXIS);
-
- Real slope = dy && dx ? dy / dx : 0;
-
- slope = 0.6 * tanh (slope) / (damping + concaveness);
-
- Real damped_dy = slope * dx;
-
- set_minimum_dy (me, &damped_dy);
-
- pos[LEFT] += (dy - damped_dy) / 2;
- pos[RIGHT] -= (dy - damped_dy) / 2;
-
- scale_drul (&pos, 1 / Staff_symbol_referencer::staff_space (me));
- }
-
- return ly_interval2scm (pos);
-}
-
-MAKE_SCHEME_CALLBACK (Beam, quanting, 2);
-SCM
-Beam::quanting (SCM smob, SCM posns)
-{
- Grob *me = unsmob_grob (smob);
- Drul_array<Real> ys (0, 0);
- ys = robust_scm2drul (posns, ys);
- Beam_scoring_problem problem (me, ys);
+ Drul_array<Real> ys = robust_scm2drul (ys_scm, Drul_array<Real> (infinity_f, -infinity_f));
+ bool cbs = to_boolean (align_broken_intos);
+ Beam_scoring_problem problem (me, ys, cbs);
ys = problem.solve ();
+
return ly_interval2scm (ys);
}
Grob *fvs = first_normal_stem (me);
Grob *lvs = last_normal_stem (me);
- Real xl = fvs ? fvs->relative_coordinate (common[X_AXIS], X_AXIS) : 0.0;
- Real xr = lvs ? lvs->relative_coordinate (common[X_AXIS], X_AXIS) : 0.0;
+ Interval x_span = robust_scm2interval (me->get_property ("X-positions"), Interval (0, 0));
Direction feather_dir = to_dir (me->get_property ("grow-direction"));
for (vsize i = 0; i < stems.size (); i++)
bool french = to_boolean (s->get_property ("french-beaming"));
Real stem_y = calc_stem_y (me, s, common,
- xl, xr, feather_dir,
+ x_span[LEFT], x_span[RIGHT], feather_dir,
pos, french && s != lvs && s != fvs);
/*
|| !Beam::normal_stem_count (beam))
return scm_from_double (0.0);
+ Grob *common_y = rest->common_refpoint (beam, Y_AXIS);
+
Drul_array<Real> pos (robust_scm2drul (beam->get_property ("positions"),
Drul_array<Real> (0, 0)));
+ Direction dir = LEFT;
+ do
+ pos[dir] += beam->relative_coordinate (common_y, Y_AXIS);
+ while (flip (&dir) != LEFT);
+
Real staff_space = Staff_symbol_referencer::staff_space (rest);
scale_drul (&pos, staff_space);
Real dy = pos[RIGHT] - pos[LEFT];
- Drul_array<Grob *> visible_stems (first_normal_stem (beam),
- last_normal_stem (beam));
extract_grob_set (beam, "stems", stems);
-
Grob *common = common_refpoint_of_array (stems, beam, X_AXIS);
- Real x0 = visible_stems[LEFT]->relative_coordinate (common, X_AXIS);
- Real dx = visible_stems[RIGHT]->relative_coordinate (common, X_AXIS) - x0;
+ Interval x_span = robust_scm2interval (beam->get_property ("X-positions"),
+ Interval (0.0, 0.0));
+ Real x0 = x_span[LEFT];
+ Real dx = x_span.length ();
Real slope = dy && dx ? dy / dx : 0;
Direction d = get_grob_direction (stem);
+ (beam_count - 1) * beam_translation;
Real beam_y = stem_y - d * height_of_my_beams;
- Grob *common_y = rest->common_refpoint (beam, Y_AXIS);
-
Interval rest_extent = rest->extent (rest, Y_AXIS);
rest_extent.translate (offset + rest->get_parent (Y_AXIS)->relative_coordinate (common_y, Y_AXIS));
return scm_from_double (amount);
Grob *beam = unsmob_grob (stem->get_object ("beam"));
if (!beam
- || !Beam::normal_stem_count (beam))
+ || !Beam::normal_stem_count (beam)
+ || !is_direction (beam->get_property_data ("direction")))
return scm_from_double (amount);
Real ss = Staff_symbol_referencer::staff_space (me);
Grob *left;
Grob *right;
- if (idx == (vsize)-1 || my_stems.size () == 1)
+ if (idx == (vsize) - 1 || my_stems.size () == 1)
return scm_from_double (amount);
else if (idx == 0)
left = right = my_stems[1];
return scm_from_double (amount);
}
-
bool
Beam::is_knee (Grob *me)
{
" measured in staffspace. The @code{direction} property is"
" not user-serviceable. Use the @code{direction} property"
" of @code{Stem} instead.\n"
- "\n"
"The following properties may be set in the @code{details}"
" list.\n"
"\n"
"auto-knee-gap "
"beamed-stem-shorten "
"beaming "
+ "beam-segments "
"beam-thickness "
"break-overshoot "
"clip-edges "
"positions "
"quantized-positions "
"shorten "
+ "skip-quanting "
"stems "
+ "X-positions "
);