/*
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>
-
+
+ (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.
It may only set directions for stems.
* Rewrite stem_beams.
-
+
+ * Use Number_pair i.s.o Interval to represent (yl, yr).
+
*/
#include "item.hh"
#include "spanner.hh"
#include "warn.hh"
+#include "text-item.hh" // debug output.
+#include "font-interface.hh" // debug output.
+
+
+#define DEBUG_QUANTING 0
+
+
+static Real
+shrink_extra_weight (Real x)
+{
+ return fabs (x) * ((x < 0) ? 1.5 : 1.0);
+}
void
Beam::add_stem (Grob *me, Grob *s)
add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
}
+
+/*
+ TODO: fix this for grace notes.
+ */
+Real
+Beam::get_interbeam (Grob *me)
+{
+ int multiplicity = get_multiplicity (me);
+ Real ss = Staff_symbol_referencer::staff_space (me);
+
+ SCM s = me->get_grob_property ("beam-space");
+ if (gh_number_p (s))
+ return gh_scm2double (s) * ss;
+ else if (s != SCM_EOL && gh_list_p (s))
+ return gh_scm2double (scm_list_ref (s,
+ gh_int2scm (multiplicity - 1
+ <? scm_ilength (s) - 1)))
+ * ss;
+
+ Real slt = me->paper_l ()->get_var ("linethickness");
+ Real thickness = gh_scm2double (me->get_grob_property ("thickness")) * ss;
+
+ Real interbeam = multiplicity < 4
+ ? (2*ss + slt - thickness) / 2.0
+ : (3*ss + slt - thickness) / 3.0;
+
+ return interbeam;
+}
+
int
Beam::get_multiplicity (Grob *me)
{
total[d] += current;
count[d] ++;
}
-
} while (flip (&d) != DOWN);
SCM func = me->get_grob_property ("dir-function");
}
/* Set stem's shorten property if unset.
- TODO:
+
+ TODO:
take some y-position (chord/beam/nearest?) into account
- scmify forced-fraction */
+ scmify forced-fraction
+
+ TODO:
+
+ why is shorten stored in beam, and not directly in stem?
+
+*/
void
Beam::set_stem_shorten (Grob *m)
{
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.
+ (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. */
return SCM_UNSPECIFIED;
}
+struct Quant_score
+{
+ Real yl;
+ Real yr;
+ Real demerits;
+};
+
+
+/*
+ TODO:
+
+ - Make all demerits customisable
+
+ - One sensible check per demerit (what's this --hwn)
+
+ - Add demerits for quants per se, as to forbid a specific quant
+ entirely
+
+*/
+MAKE_SCHEME_CALLBACK (Beam, quanting, 1);
+SCM
+Beam::quanting (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ SCM s = me->get_grob_property ("positions");
+ Real yl = gh_scm2double (gh_car (s));
+ Real yr = gh_scm2double (gh_cdr (s));
+
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ Real thickness = gh_scm2double (me->get_grob_property ("thickness")) / ss;
+ Real slt = me->paper_l ()->get_var ("linethickness") / ss;
+
+
+ SCM sdy = me->get_grob_property ("least-squares-dy");
+ Real dy_mus = gh_number_p (sdy) ? gh_scm2double (sdy) : 0.0;
+
+ Real straddle = 0.0;
+ Real sit = (thickness - slt) / 2;
+ Real inter = 0.5;
+ Real hang = 1.0 - (thickness - slt) / 2;
+ Real quants [] = {straddle, sit, inter, hang };
+
+ int num_quants = int (sizeof (quants)/sizeof (Real));
+ Array<Real> quantsl;
+ Array<Real> quantsr;
+
+ /*
+ going to REGION_SIZE == 2, yields another 0.6 second with
+ wtk1-fugue2.
+
+
+ (result indexes between 70 and 575) ? --hwn.
+
+ */
+
+ 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;
+
+ 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);
+ }
+
+
+ /*
+ This is a longish function, but we don't separate this out into
+ neat modular separate subfunctions, as the subfunctions would be
+ called for many values of YL, YR. By precomputing various
+ parameters outside of the loop, we can save a lot of time.
+
+ */
+ for (int i = qscores.size (); i--;)
+ if (qscores[i].demerits < 100)
+ {
+ qscores[i].demerits
+ += score_slopes_dy (me, qscores[i].yl, qscores[i].yr,
+ dy_mus, yr- yl);
+ }
+
+ Real rad = Staff_symbol_referencer::staff_radius (me);
+ int multiplicity = get_multiplicity (me);
+ Real interbeam = multiplicity < 4
+ ? (2*ss + slt - thickness) / 2.0
+ : (3*ss + slt - thickness) / 3.0;
+
+ for (int i = qscores.size (); i--;)
+ if (qscores[i].demerits < 100)
+ {
+ qscores[i].demerits
+ += score_forbidden_quants (me, qscores[i].yl, qscores[i].yr,
+ rad, slt, thickness, interbeam,
+ multiplicity);
+ }
+
+
+ /*
+ Do stem lengths. These depend on YL and YR linearly, so we can
+ precompute for every stem 2 factors.
+ */
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "stems");
+ Array<Stem_info> stem_infos;
+ Array<Real> lbase_lengths;
+ Array<Real> rbase_lengths;
+
+ Array<int> directions;
+ for (int i= 0; i < stems.size(); i++)
+ {
+ Grob*s = stems[i];
+ stem_infos.push( Stem::calc_stem_info (s));
+
+ Real b = calc_stem_y (me, s, Interval (1,0));
+ lbase_lengths.push (b);
+
+ b = calc_stem_y (me, s, Interval (0,1));
+ rbase_lengths.push (b);
+ directions.push( Directional_element_interface::get( s));
+ }
+
+ for (int i = qscores.size (); i--;)
+ if (qscores[i].demerits < 100)
+ {
+ qscores[i].demerits
+ += score_stem_lengths (stems, stem_infos,
+ lbase_lengths, rbase_lengths,
+ directions,
+ me, qscores[i].yl, qscores[i].yr);
+ }
+
+
+ Real best = 1e6;
+ int best_idx = -1;
+ for (int i = qscores.size (); i--;)
+ {
+ if (qscores[i].demerits < best)
+ {
+ best = qscores [i].demerits ;
+ best_idx = i;
+ }
+ }
+
+
+ me->set_grob_property ("positions",
+ gh_cons (gh_double2scm (qscores[best_idx].yl),
+ gh_double2scm (qscores[best_idx].yr))
+ );
+
+ if (DEBUG_QUANTING)
+ {
+ // debug quanting
+ me->set_grob_property ("quant-score",
+ gh_double2scm (qscores[best_idx].demerits));
+ me->set_grob_property ("best-idx", gh_int2scm (best_idx));
+ }
+
+ return SCM_UNSPECIFIED;
+}
+
+Real
+Beam::score_stem_lengths (Link_array<Grob>stems,
+ Array<Stem_info> stem_infos,
+ Array<Real> left_factor,
+ Array<Real> right_factor,
+ Array<int> directions,
+ Grob*me, Real yl, Real yr)
+{
+ Real demerit_score = 0.0 ;
+
+ for (int i=0; i < stems.size (); i++)
+ {
+ Grob* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+
+ Real current_y =
+ yl * left_factor[i] + right_factor[i]* yr;
+
+ Stem_info info = stem_infos[i];
+ Direction d = Direction (directions[i]);
+
+ demerit_score += 500 * ( 0 >? (info.min_y - d * current_y));
+ demerit_score += 500 * ( 0 >? (d * current_y - info.max_y));
+
+ demerit_score += 5 * shrink_extra_weight (d * current_y - info.ideal_y);
+ }
+
+ demerit_score *= 2.0 /stems.size ();
+
+ return demerit_score;
+}
+
+Real
+Beam::score_slopes_dy (Grob *me, Real yl, Real yr,
+ Real dy_mus, Real dy_damp)
+{
+ Real dy = yr - yl;
+
+ Real dem = 0.0;
+ if (sign (dy_damp) != sign (dy))
+ {
+ dem += 800;
+ }
+
+ dem += 400* (0 >? (fabs (dy) - fabs (dy_mus)));
+
+
+ dem += shrink_extra_weight (fabs (dy_damp) - fabs (dy))* 10;
+ return dem;
+}
+
+static Real
+my_modf (Real x)
+{
+ return x - floor (x);
+}
+
+Real
+Beam::score_forbidden_quants (Grob*me,
+ Real yl, Real yr,
+ Real rad,
+ Real slt,
+ Real thickness, Real interbeam,
+ int multiplicity)
+{
+ Real dy = yr - yl;
+
+ Real dem = 0.0;
+ if (fabs (yl) < rad && fabs ( my_modf (yl) - 0.5) < 1e-3)
+ dem += 1000;
+ if (fabs (yr) < rad && fabs ( my_modf (yr) - 0.5) < 1e-3)
+ dem += 1000;
+
+ // todo: use multiplicity of outer stems.
+ if (multiplicity >= 2)
+ {
+
+ Real straddle = 0.0;
+ Real sit = (thickness - slt) / 2;
+ Real inter = 0.5;
+ Real hang = 1.0 - (thickness - slt) / 2;
+
+ Direction dir = Directional_element_interface::get (me);
+ if (fabs (yl - dir * interbeam) < rad
+ && fabs (my_modf (yl) - inter) < 1e-3)
+ dem += 15;
+ if (fabs (yr - dir * interbeam) < rad
+ && fabs (my_modf (yr) - inter) < 1e-3)
+ dem += 15;
+
+ Real eps = 1e-3;
+
+ /*
+ Can't we simply compute the distance between the nearest
+ staffline and the secondary beam? That would get rid of the
+ silly case analysis here (which is probably not when we have
+ different beam-thicknesses.)
+
+ --hwn
+ */
+
+ // hmm, without Interval/Drul_array, you get ~ 4x same code...
+ if (fabs (yl - dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy <= eps
+ && fabs (my_modf (yl) - sit) < eps)
+ dem += 15;
+
+ if (dir == DOWN && dy >= eps
+ && fabs (my_modf (yl) - hang) < eps)
+ dem += 15;
+ }
+
+ if (fabs (yr - dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy >= eps
+ && fabs (my_modf (yr) - sit) < eps)
+ dem += 15;
+
+ if (dir == DOWN && dy <= eps
+ && fabs (my_modf (yr) - hang) < eps)
+ dem += 15;
+ }
+
+ if (multiplicity >= 3)
+ {
+ if (fabs (yl - 2 * dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy <= eps
+ && fabs (my_modf (yl) - straddle) < eps)
+ dem += 15;
+
+ if (dir == DOWN && dy >= eps
+ && fabs (my_modf (yl) - straddle) < eps)
+ dem += 15;
+ }
+
+ if (fabs (yr - 2 * dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy >= eps
+ && fabs (my_modf (yr) - straddle) < eps)
+ dem += 15;
+
+ if (dir == DOWN && dy <= eps
+ && fabs (my_modf (yr) - straddle) < eps)
+ dem += 15;
+ }
+ }
+ }
+
+ return dem;
+}
+
+
MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
SCM
Direction dir = Directional_element_interface::get (me);
- Interval ideal (Stem::calc_stem_info (first_visible_stem (me)).idealy_f_,
- Stem::calc_stem_info (last_visible_stem (me)).idealy_f_);
+ Interval ideal (Stem::calc_stem_info (first_visible_stem (me)).ideal_y,
+ Stem::calc_stem_info (last_visible_stem (me)).ideal_y);
+
if (!ideal.delta ())
{
Interval chord (Stem::chord_start_f (first_visible_stem (me)),
Stem::chord_start_f (last_visible_stem (me)));
-
+
+
+ /*
+ 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)
{
- Direction d = (Direction)(sign (chord.delta ()) * dir);
+ 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 = ideal;
+ pos[LEFT] *= dir ;
+ pos[RIGHT] *= dir ;
+ }
}
else
{
if (Stem::invisible_b (s))
continue;
ideals.push (Offset (s->relative_coordinate (0, X_AXIS) - x0,
- Stem::calc_stem_info (s).idealy_f_));
+ Stem::calc_stem_info (s).ideal_y));
}
Real y;
Real dydx;
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);
}
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++)
+ Direction dir = Directional_element_interface::get (me);
+ /* Concaveness #1: If distance of an inner notehead to line between
+ two outer noteheads is bigger than CONCAVENESS-GAP (2.0ss),
+ beam is concave (Heinz Stolba). */
+ bool concaveness1 = false;
+ Real r1 = gh_scm2double (me->get_grob_property ("concaveness-gap"));
+ if (r1 > 0)
{
- 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;
+ Real dy = Stem::chord_start_f (stems.top ())
+ - Stem::chord_start_f (stems[0]);
+ Real slope = dy / (stems.size () - 1);
+
+ Real y0 = Stem::chord_start_f (stems[0]);
+ for (int i = 1; i < stems.size () - 1; i++)
+ {
+ Real c = (Stem::chord_start_f (stems[i]) - y0) - i * slope;
+ if (c > r1)
+ {
+ concaveness1 = true;
+ break;
+ }
+ }
}
- concave *= Directional_element_interface::get (me);
+
+
+ /* Concaveness #2: Sum distances of inner noteheads that fall
+ outside the interval of the two outer noteheads */
+ Real concaveness2 = 0;
+ Real r2 = gh_scm2double (me->get_grob_property ("concaveness-threshold"));
+ if (!concaveness1 && r2 > 0)
+ {
+ Real concave = 0;
+ Interval iv (Stem::chord_start_f (stems[0]),
+ Stem::chord_start_f (stems.top ()));
- 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"));
+ 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 *= dir;
+ concaveness2 = concave / (stems.size () - 2);
+ /* ugh: this is the a kludge to get input/regression/beam-concave.ly
+ to behave as baerenreiter. */
+ concaveness2 /= (stems.size () - 2);
+ }
+
/* TODO: some sort of damping iso -> plain horizontal */
- if (concaveness > r)
+ if (concaveness1 || concaveness2 > r2)
{
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));
}
return SCM_UNSPECIFIED;
return SCM_UNSPECIFIED;
}
-
-/* Prevent interference from stafflines. */
-Interval
-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");
-
- /* TODO:
-
- - left and right should be different, depending on direction and
- multiplicity
-
- -use different left-position-quant-function,
- right-position-quant-function for handier slope quanting? */
- 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 (Beam, quantise_position, 1);
-SCM
-Beam::quantise_position (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
- Real y_shift = check_stem_length_f (me, pos);
- pos += y_shift;
- pos = quantise_interval (me, pos, CENTER);
-
- me->set_grob_property ("positions", ly_interval2scm (pos));
- set_stem_lengths (me);
-
- 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);
- }
-
- me->set_grob_property ("positions", ly_interval2scm (pos));
-
- return SCM_UNSPECIFIED;
-}
-
MAKE_SCHEME_CALLBACK (Beam, end_after_line_breaking, 1);
SCM
Beam::end_after_line_breaking (SCM smob)
return SCM_UNSPECIFIED;
}
+/*
+ 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)
+Beam::calc_stem_y (Grob *me, Grob* 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);
+ Real interbeam = get_interbeam (me);
// ugh -> use commonx
Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
/* 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
-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;
+ stem_y -= dir * (thick / 2 + (beam_multiplicity - 1) * interbeam);
- 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;
+ // huh, why not for first visible?
- if (info.idealy_f_ - stem_y > 0)
+ Grob *last_visible = last_visible_stem (me);
+ if (last_visible)
{
- 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 ( Staff_symbol_referencer::staff_symbol_l (s)
+ != Staff_symbol_referencer::staff_symbol_l (last_visible))
+ stem_y += Directional_element_interface::get (me)
+ * (beam_multiplicity - stem_multiplicity) * interbeam;
}
+ else
+ programming_error ("No last visible stem");
}
-
- 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);
+ return stem_y;
}
/*
if (Stem::invisible_b (s))
continue;
- Real stem_y = calc_stem_y_f (me, s, pos);
+ Real stem_y = calc_stem_y (me, s, pos);
// doesn't play well with dvips
if (ps_testing)
{
// ugh -> use commonx
if ((next
- && !(next->relative_coordinate (0, X_AXIS)
+ && ! (next->relative_coordinate (0, X_AXIS)
> here->relative_coordinate (0, X_AXIS)))
|| (prev
- && !(prev->relative_coordinate (0, X_AXIS)
+ && ! (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;
+ Real bdy = get_interbeam (me);
Molecule leftbeams;
Molecule rightbeams;
- prev->relative_coordinate (0, X_AXIS);
Real stem_w = gh_scm2double (prev->get_grob_property ("thickness"))
// URG
- * me->paper_l ()->get_var ("stafflinethickness");
+ * me->paper_l ()->get_var ("linethickness");
w = w/2 <? nw_f;
Molecule a;
Real stem_w = gh_scm2double (next->get_grob_property ("thickness"))
// URG
- * me->paper_l ()->get_var ("stafflinethickness");
+ * me->paper_l ()->get_var ("linethickness");
Molecule a = Lookup::beam (dydx, w + stem_w, thick);
a.translate_axis (- stem_w/2, X_AXIS);
return leftbeams;
}
+
MAKE_SCHEME_CALLBACK (Beam, brew_molecule, 1);
SCM
Beam::brew_molecule (SCM smob)
->get_bound (LEFT)->relative_coordinate (0, X_AXIS),
X_AXIS);
+ if (DEBUG_QUANTING)
+ {
+ /*
+ This code prints the demerits for each beam. Perhaps this
+ should be switchable for those who want to twiddle with the
+ parameters.
+ */
+ String str;
+ if (1)
+ {
+ str += to_str (gh_scm2int (me->get_grob_property ("best-idx")));
+ str += ":";
+ }
+ str += to_str (gh_scm2double (me->get_grob_property ("quant-score")),
+ "%.2f");
+
+ 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 ();
}
-/* TODO:
- use filter and standard list functions.
- */
int
Beam::visible_stem_count (Grob *me)
{
/*
[TODO]
+
handle rest under beam (do_post: beams are calculated now)
what about combination of collisions and rest under beam.
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 staff_space = Staff_symbol_referencer::staff_space (rest);
Real rest_dim = rest->extent (rest, Y_AXIS)[d]*2.0 / staff_space; // refp??
return me->has_interface (ly_symbol2scm ("beam-interface"));
}
+
+ADD_INTERFACE (Beam, "beam-interface",
+ "A beam.
+
+#'thickness= weight of beams, in staffspace
+
+
+We take the least squares line through the ideal-length stems, and
+then damp that using
+
+ damped = tanh (slope)
+
+this gives an unquantized left and right position for the beam end.
+Then we take all combinations of quantings near these left and right
+positions, and give them a score (according to how close they are to
+the ideal slope, how close the result is to the ideal stems, etc.). We
+take the best scoring combination.
+
+",
+ "beam-space concaveness-gap concaveness-threshold dir-function quant-score auto-knee-gap gap chord-tremolo beamed-stem-shorten shorten least-squares-dy direction damping flag-width-function neutral-direction positions thickness");
+
projects / lilypond.git / blobdiff