- Stems run to the Y-center of the beam.
- - beam_space is the offset between Y centers of the beam.
+ - beam_translation is the offset between Y centers of the beam.
*/
#include <math.h> // tanh.
-#include "align-interface.hh"
#include "molecule.hh"
#include "directional-element-interface.hh"
#include "beaming.hh"
#endif
-const int INTER_QUANT_PENALTY = 1000;
-const int SECONDARY_BEAM_DEMERIT = 15;
-const int STEM_LENGTH_DEMERIT_FACTOR = 5;
-// possibly ridiculous, but too short stems just won't do
-const int STEM_LENGTH_LIMIT_PENALTY = 5000;
-const int DAMPING_DIRECTIION_PENALTY = 800;
-const int MUSICAL_DIRECTION_FACTOR = 400;
-const int IDEAL_SLOPE_FACTOR = 10;
-const int REGION_SIZE = 2;
-
-
-static Real
-shrink_extra_weight (Real x)
-{
- return fabs (x) * ((x < 0) ? 1.5 : 1.0);
-}
-
void
Beam::add_stem (Grob *me, Grob *s)
{
s->add_dependency (me);
- assert (!Stem::beam_l (s));
+ assert (!Stem::get_beam (s));
s->set_grob_property ("beam", me->self_scm ());
add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
}
+
+/*
+ this returns the translation between 2 adjoining beams.
+ */
Real
-Beam::get_beam_space (Grob *me)
+Beam::get_beam_translation (Grob *me)
{
SCM func = me->get_grob_property ("space-function");
SCM s = gh_call2 (func, me->self_scm (), gh_int2scm (get_beam_count (me)));
Grob *me = unsmob_grob (smob);
Real staff_space = Staff_symbol_referencer::staff_space (me);
- Real line = me->paper_l ()->get_var ("linethickness");
+ Real line = me->get_paper ()->get_var ("linethickness");
Real thickness = gh_scm2double (me->get_grob_property ("thickness"))
* staff_space;
- Real beam_space = gh_scm2int (beam_count) < 4
+ Real beam_translation = gh_scm2int (beam_count) < 4
? (2*staff_space + line - thickness) / 2.0
: (3*staff_space + line - thickness) / 3.0;
- return gh_double2scm (beam_space);
+ return gh_double2scm (beam_translation);
}
}
else
{
+ gh_set_car_x ( this_beaming, SCM_EOL);
SCM s = gh_cdr (this_beaming);
for (; gh_pair_p (s); s = gh_cdr (s))
{
last_int.add_point (np);
}
}
+
+ if (i == stems.size () -1)
+ {
+ gh_set_cdr_x ( this_beaming, SCM_EOL);
+ }
}
-}
+ }
MAKE_SCHEME_CALLBACK (Beam, brew_molecule, 1);
SCM
Real dydx = dy && dx ? dy/dx : 0;
Real thick = gh_scm2double (me->get_grob_property ("thickness"));
- Real bdy = get_beam_space (me);
+ Real bdy = get_beam_translation (me);
SCM last_beaming = SCM_EOL;;
Real last_xposn = -1;
SCM gap = me->get_grob_property ("gap");
Molecule the_beam;
- Real lt = me->paper_l ()->get_var ("linethickness");
+ Real lt = me->get_paper ()->get_var ("linethickness");
for (int i = 0; i< stems.size(); i++)
{
Grob * st =stems[i];
String str;
if (1)
{
- str += to_str (gh_scm2int (me->get_grob_property ("best-idx")));
+ str += to_string (gh_scm2int (me->get_grob_property ("best-idx")));
str += ":";
}
- str += to_str (gh_scm2double (me->get_grob_property ("quant-score")),
+ str += to_string (gh_scm2double (me->get_grob_property ("quant-score")),
"%.2f");
SCM properties = Font_interface::font_alist_chain (me);
- Molecule tm = Text_item::text2molecule (me, ly_str02scm (str.ch_C ()), properties);
+ Molecule tm = Text_item::text2molecule (me, ly_str02scm (str.to_str0 ()), properties);
the_beam.add_at_edge (Y_AXIS, UP, tm, 5.0);
}
#endif
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);
+ /* For knees, non-forced stems should probably have their
+ natural direction. In any case, when knee, beam direction is
+ foe.
+
+ TODO: for x staff knees, set direction pointing to 'the
+ other' staff, rather than natural.
+ */
+ if (knee_b(me))
+ {
+ Stem::get_direction (s); // this actually sets it, if necessary
+ }
+ else
+ {
+ 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. */
+ This may decide for a knee that's impossible to fit sane scoring
+ criteria (eg, stem lengths). We may need something smarter. */
void
Beam::consider_auto_knees (Grob *me, Direction d)
{
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;
-
+ if (!gh_number_p (scm))
+ return;
+
+ bool knee_b = false;
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real gap = gh_scm2double (scm) / staff_space;
- Link_array<Grob> stems=
- Pointer_group_interface__extract_grobs (me, (Grob*)0, "stems");
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "stems");
- Grob *common = common_refpoint_of_array (stems, me, 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;
+ Grob *common = common_refpoint_of_array (stems, me, Y_AXIS);
+
+ int l = 0;
+ for (int r=1; r < stems.size (); r++)
+ {
+ if (!Stem::invisible_b (stems[r-1]))
+ l = r - 1;
+ Grob *right = stems[r];
+ Grob *left = stems[l];
+ if (Stem::invisible_b (left))
+ continue;
+ if (Stem::invisible_b (right))
+ 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 left_y = Stem::extremal_heads (left)[d]
+ ->relative_coordinate (common, Y_AXIS);
+ Real right_y = Stem::extremal_heads (right)[-d]
+ ->relative_coordinate (common, Y_AXIS);
- Real dy = right - left;
+ Real dy = right_y - left_y;
- if (abs (dy) >= gap)
- {
- knee_y = (right + left) / 2;
- knee_b = true;
- break;
- }
- }
-
- if (knee_b)
+ if (abs (dy) >= gap)
{
- for (int i=0; i < stems.size (); i++)
+ knee_b = true;
+ Direction knee_dir = (right_y > left_y ? UP : DOWN);
+ if (!Stem::invisible_b (left)
+ && left->get_grob_property ("dir-forced") != SCM_BOOL_T)
{
- Grob *s = stems[i];
- if (Stem::invisible_b (s) ||
- s->get_grob_property ("dir-forced") == SCM_BOOL_T)
- continue;
- Real y = Stem::extremal_heads (stems[i])[d]
- ->relative_coordinate (common, Y_AXIS);
+ Directional_element_interface::set (left, knee_dir);
+ left->set_grob_property ("dir-forced", SCM_BOOL_T);
- Directional_element_interface::set (s, y < knee_y ? UP : DOWN);
- s->set_grob_property ("dir-forced", SCM_BOOL_T);
+ }
+ if (!Stem::invisible_b (right)
+ && stems[r]->get_grob_property ("dir-forced") != SCM_BOOL_T)
+ {
+ Directional_element_interface::set (right, -knee_dir);
+ right->set_grob_property ("dir-forced", SCM_BOOL_T);
}
}
}
+
+ if (knee_b)
+ {
+ me->set_grob_property ("knee", SCM_BOOL_T);
+
+ for (int i=0; i < stems.size (); i++)
+ stems[i]->set_grob_property ("stem-info", SCM_EOL);
+ }
}
/* Set stem's shorten property if unset.
TODO:
take some y-position (chord/beam/nearest?) into account
scmify forced-fraction
-
- TODO:
-
- why is shorten stored in beam, and not directly in stem?
+
+ This is done in beam because the shorten has to be uniform over the
+ entire beam.
*/
void
-Beam::set_stem_shorten (Grob *m)
+Beam::set_stem_shorten (Grob *me)
{
- Spanner*me = dynamic_cast<Spanner*> (m);
-
+ /*
+ shortening looks silly for x staff beams
+ */
+ if (knee_b(me))
+ return ;
+
Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
int beam_count = get_beam_count (me);
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.
-
- */
-
-
-
- /*
- Do stem computations. 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;
-
- Drul_array<bool> dirs_found(0,0);
- Grob *common_y = common_refpoint_of_array (stems, me, Y_AXIS);
-
- bool french = to_boolean (me->get_grob_property ("french-beaming"));
- for (int i= 0; i < stems.size(); i++)
- {
- Grob*s = stems[i];
- stem_infos.push (Stem::calc_stem_info (s));
- dirs_found[stem_infos.top ().dir_] = true;
-
- Real b = calc_stem_y (me, s, common_y , Interval (1,0), french && i > 0&& (i < stems.size () -1));
- lbase_lengths.push (b);
-
- Real a = calc_stem_y (me, s, common_y , Interval (0,1), french && i > 0&& (i < stems.size () -1));
- rbase_lengths.push (a);
- }
-
- Direction ldir = Direction (stem_infos[0].dir_);
- Direction rdir = Direction (stem_infos.top ().dir_);
- bool knee_b = dirs_found[LEFT] && dirs_found[RIGHT];
-
-
- int region_size = REGION_SIZE;
- /*
- Knees are harder, lets try some more possibilities for knees.
- */
- if (knee_b)
- region_size += 2;
-
- 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.
-
- */
-
-
- Grob *fvs = first_visible_stem (me);
- Grob *lvs = last_visible_stem (me);
-
- bool xstaff= false;
- if (lvs && fvs)
- {
- Grob *commony = fvs->common_refpoint (lvs, Y_AXIS);
- xstaff = Align_interface::has_interface (commony);
- }
-
- 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, xstaff);
- }
-
- Real rad = Staff_symbol_referencer::staff_radius (me);
- int beam_count = get_beam_count (me);
- Real beam_space = beam_count < 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, beam_space,
- beam_count, ldir, rdir);
- }
-
-
- for (int i = qscores.size (); i--;)
- if (qscores[i].demerits < 100)
- {
- qscores[i].demerits
- += score_stem_lengths (stems, stem_infos,
- lbase_lengths, rbase_lengths,
- knee_b,
- 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));
-#endif
-
- 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,
- bool knee,
- Grob*me,
- Real yl, Real yr)
-{
- Real demerit_score = 0.0 ;
- Real pen = STEM_LENGTH_LIMIT_PENALTY;
-
- 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 = info.dir_;
-
- demerit_score += pen
- * ( 0 >? (info.dir_ * (info.shortest_y_ - current_y)));
-
- demerit_score += STEM_LENGTH_DEMERIT_FACTOR
- * shrink_extra_weight (d * current_y - info.dir_ * 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,
- bool xstaff)
-{
- Real dy = yr - yl;
-
- Real dem = 0.0;
- if (sign (dy_damp) != sign (dy))
- {
- dem += DAMPING_DIRECTIION_PENALTY;
- }
-
- dem += MUSICAL_DIRECTION_FACTOR * (0 >? (fabs (dy) - fabs (dy_mus)));
-
-
- Real slope_penalty = IDEAL_SLOPE_FACTOR;
-
- /*
- Xstaff beams tend to use extreme slopes to get short stems. We
- put in a penalty here.
- */
- if (xstaff)
- slope_penalty *= 10;
-
- dem += shrink_extra_weight (fabs (dy_damp) - fabs (dy))* slope_penalty;
- 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 beam_space,
- int beam_count,
- Direction ldir, Direction rdir)
-{
- Real dy = yr - yl;
-
- Real dem = 0.0;
- if (fabs (yl) < rad && fabs ( my_modf (yl) - 0.5) < 1e-3)
- dem += INTER_QUANT_PENALTY;
- if (fabs (yr) < rad && fabs ( my_modf (yr) - 0.5) < 1e-3)
- dem += INTER_QUANT_PENALTY;
-
- // todo: use beam_count of outer stems.
- if (beam_count >= 2)
- {
-
- Real straddle = 0.0;
- Real sit = (thickness - slt) / 2;
- Real inter = 0.5;
- Real hang = 1.0 - (thickness - slt) / 2;
-
-
- if (fabs (yl - ldir * beam_space) < rad
- && fabs (my_modf (yl) - inter) < 1e-3)
- dem += SECONDARY_BEAM_DEMERIT;
- if (fabs (yr - rdir * beam_space) < rad
- && fabs (my_modf (yr) - inter) < 1e-3)
- dem += SECONDARY_BEAM_DEMERIT;
-
- 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 - ldir * beam_space) < rad + inter)
- {
- if (ldir == UP && dy <= eps
- && fabs (my_modf (yl) - sit) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
-
- if (ldir == DOWN && dy >= eps
- && fabs (my_modf (yl) - hang) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
- }
-
- if (fabs (yr - rdir * beam_space) < rad + inter)
- {
- if (rdir == UP && dy >= eps
- && fabs (my_modf (yr) - sit) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
-
- if (rdir == DOWN && dy <= eps
- && fabs (my_modf (yr) - hang) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
- }
-
- if (beam_count >= 3)
- {
- if (fabs (yl - 2 * ldir * beam_space) < rad + inter)
- {
- if (ldir == UP && dy <= eps
- && fabs (my_modf (yl) - straddle) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
-
- if (ldir == DOWN && dy >= eps
- && fabs (my_modf (yl) - straddle) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
- }
-
- if (fabs (yr - 2 * rdir * beam_space) < rad + inter)
- {
- if (rdir == UP && dy >= eps
- && fabs (my_modf (yr) - straddle) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
-
- if (rdir == DOWN && dy <= eps
- && fabs (my_modf (yr) - straddle) < eps)
- dem += SECONDARY_BEAM_DEMERIT;
- }
- }
- }
-
- return dem;
-}
-
-
-
MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
SCM
Beam::least_squares (SCM smob)
/*
Calculate the Y position of the stem-end, given the Y-left, Y-right
- in POS, and for stem S.
+ in POS for stem S. This Y position is relative to S.
*/
Real
-Beam::calc_stem_y (Grob *me, Grob* s, Grob * common_y, Interval pos, bool french)
+Beam::calc_stem_y (Grob *me, Grob* s, Grob ** common,
+ Real xl, Real xr,
+ Interval pos, bool french)
{
- Real beam_space = get_beam_space (me);
+ Real beam_translation = get_beam_translation (me);
- // ugh -> use commonx
- Grob * fvs = first_visible_stem (me);
- Grob *lvs = last_visible_stem (me);
- Real x0 = fvs ? fvs->relative_coordinate (0, X_AXIS) : 0.0;
- Real dx = fvs ? lvs->relative_coordinate (0, X_AXIS) - x0 : 0.0;
- Real r = s->relative_coordinate (0, X_AXIS) - x0;
+ Real r = s->relative_coordinate (common[X_AXIS], X_AXIS) - xl;
Real dy = pos.delta ();
+ Real dx = xr - xl;
Real stem_y_beam0 = (dy && dx
? r / dx
* dy
: 0) + pos[LEFT];
-
-
Direction my_dir = Directional_element_interface::get (s);
SCM beaming = s->get_grob_property ("beaming");
{
Slice bm = where_are_the_whole_beams (beaming);
if (!bm.empty_b())
- stem_y += beam_space * bm[-my_dir];
+ stem_y += beam_translation * bm[-my_dir];
}
else
{
Slice bm = Stem::beam_multiplicity(s);
if (!bm.empty_b())
- stem_y +=bm[my_dir] * beam_space;
+ stem_y +=bm[my_dir] * beam_translation;
}
- Real id = me->relative_coordinate (common_y, Y_AXIS)
- - s->relative_coordinate (common_y, Y_AXIS);
+ Real id = me->relative_coordinate (common[Y_AXIS], Y_AXIS)
+ - s->relative_coordinate (common[Y_AXIS], Y_AXIS);
return stem_y + id;
}
if (stems.size () <= 1)
return;
- Grob *common = common_refpoint_of_array (stems, me, Y_AXIS);
+ Grob *common[2];
+ for (int a = 2; a--;)
+ common[a] = common_refpoint_of_array (stems, me, Axis(a));
+
Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
Real staff_space = Staff_symbol_referencer::staff_space (me);
bool french = to_boolean (me->get_grob_property ("french-beaming"));
-
+
+
+ bool gap = false;
+ Real thick =0.0;
+ if (gh_number_p (me->get_grob_property ("gap"))
+ &&gh_scm2double (me->get_grob_property ("gap")))
+ {
+ gap = true;
+ thick = gh_scm2double (me->get_grob_property ("thickness"))
+ * Staff_symbol_referencer::staff_space(me);
+ }
+
+ // ugh -> use commonx
+ Grob * fvs = first_visible_stem (me);
+ Grob *lvs = last_visible_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;
+
for (int i=0; i < stems.size (); i++)
{
Grob* s = stems[i];
if (Stem::invisible_b (s))
continue;
- Real stem_y = calc_stem_y (me, s, common , pos, french && i > 0&& (i < stems.size () -1));
+ Real stem_y = calc_stem_y (me, s, common,
+ xl, xr,
+ pos, french && i > 0&& (i < stems.size () -1));
- Stem::set_stemend (s, 2* stem_y / staff_space);
+ /*
+ Make the stems go up to the end of the beam. This doesn't matter
+ for normal beams, but for tremolo beams it looks silly otherwise.
+ */
+ if (gap)
+ stem_y += thick * 0.5 * Directional_element_interface::get(s);
+
+ Stem::set_stemend (s, 2* stem_y / staff_space);
}
}
return gh_double2scm (-d * discrete_dist);
}
+bool
+Beam::knee_b (Grob*me)
+{
+ SCM k = me->get_grob_property ("knee");
+ if (gh_boolean_p (k))
+ return gh_scm2bool (k);
+ bool knee = false;
+ int d = 0;
+ for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
+ {
+ Direction dir = Directional_element_interface::get
+ (unsmob_grob (ly_car (s)));
+ if (d && d != dir)
+ {
+ knee = true;
+ break;
+ }
+ d = dir;
+ }
+
+ me->set_grob_property ("knee", gh_bool2scm (knee));
+ return knee;
+}
ADD_INTERFACE (Beam, "beam-interface",
"A beam.
projects / lilypond.git / blobdiff