source file of the GNU LilyPond music typesetter
- (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
-
*/
/*
TODO:
-
- * Junk stem_info.
-
* Use Number_pair i.s.o Interval to represent (yl, yr).
- Determine auto knees based on positions if it's set by the user.
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_thickness (Grob * me)
+{
+ SCM th = me->get_grob_property ("thickness");
+ if (gh_number_p (th))
+ return gh_scm2double (th)* Staff_symbol_referencer::staff_space (me);
+ else
+ return 0.0;
+}
+
+/* Return the translation between 2 adjoining beams. */
Real
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)));
+ SCM s = gh_call2 (func, me->self_scm (), scm_int2num (get_beam_count (me)));
return gh_scm2double (s);
}
-/*
- Maximum beam_count.
- */
+/* Maximum beam_count. */
int
Beam::get_beam_count (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));
-
- m = m >? (Stem::beam_multiplicity (sc).length () + 1);
+ Grob *stem = unsmob_grob (ly_car (s));
+ m = m >? (Stem::beam_multiplicity (stem).length () + 1);
}
return m;
}
+
+/*
+ Space return space between beams.
+ */
MAKE_SCHEME_CALLBACK (Beam, space_function, 2);
SCM
Beam::space_function (SCM smob, SCM beam_count)
Grob *me = unsmob_grob (smob);
Real staff_space = Staff_symbol_referencer::staff_space (me);
- Real line = me->paper_l ()->get_var ("linethickness");
- Real thickness = gh_scm2double (me->get_grob_property ("thickness"))
- * staff_space;
+ Real line = me->get_paper ()->get_var ("linethickness");
+ Real thickness = get_thickness (me);
Real beam_translation = gh_scm2int (beam_count) < 4
? (2*staff_space + line - thickness) / 2.0
{
me->warning (_ ("Beam has less than two stems. Removing beam."));
- unsmob_grob (gh_car (stems))->remove_grob_property ("beam");
+ unsmob_grob (gh_car (stems))->set_grob_property ("beam", SCM_EOL);
me->suicide ();
return SCM_UNSPECIFIED;
{
Direction d = get_default_dir (me);
- consider_auto_knees (me, d);
+ consider_auto_knees (me);
set_stem_directions (me, d);
connect_beams (me);
}
+/*
+ We want a maximal number of shared beams, but if there is choice, we
+ take the one that is closest to the end of the stem. This is for situations like
+
+ x
+ |
+ |
+ |===|
+ |=
+ |
+ x
+
+
+ */
+int
+position_with_maximal_common_beams (SCM left_beaming, SCM right_beaming,
+ Direction left_dir,
+ Direction right_dir)
+{
+ Slice lslice = int_list_to_slice (gh_cdr (left_beaming));
+
+ int best_count = 0;
+ int best_start = 0;
+ for (int i = lslice[-left_dir];
+ (i - lslice[left_dir])* left_dir <= 0 ; i+= left_dir)
+ {
+ int count =0;
+ for ( SCM s = gh_car (right_beaming); gh_pair_p (s); s = gh_cdr (s))
+ {
+ int k = - right_dir * gh_scm2int (gh_car (s)) + i;
+ if (scm_memq (scm_int2num (k), left_beaming) != SCM_BOOL_F)
+ count ++;
+ }
+
+ if (count >= best_count)
+ {
+ best_count = count;
+ best_start = i;
+ }
+ }
+
+ return best_start;
+}
void
Beam::connect_beams (Grob *me)
Slice last_int;
last_int.set_empty();
+ SCM last_beaming = SCM_EOL;
+ Direction last_dir = CENTER;
for (int i = 0; i< stems.size(); i++)
{
Grob *this_stem = stems[i];
SCM this_beaming = this_stem->get_grob_property ("beaming");
Direction this_dir = Directional_element_interface::get(this_stem);
- if (i > 0)
+ if (gh_pair_p (last_beaming) && gh_pair_p (this_beaming))
{
- int start_point = last_int [this_dir];
+ int start_point = position_with_maximal_common_beams
+ (last_beaming, this_beaming,
+ last_dir, this_dir);
Direction d = LEFT;
Slice new_slice ;
start_point - this_dir * gh_scm2int (gh_car (s));
new_slice.add_point (new_beam_pos);
- gh_set_car_x (s, gh_int2scm (new_beam_pos));
+ gh_set_car_x (s, scm_int2num (new_beam_pos));
}
+
+
}
while (flip (&d) != LEFT);
for (; gh_pair_p (s); s = gh_cdr (s))
{
int np = - this_dir * gh_scm2int (gh_car(s));
- gh_set_car_x (s, gh_int2scm (np));
+ gh_set_car_x (s, scm_int2num (np));
last_int.add_point (np);
}
}
if (i == stems.size () -1)
{
- gh_set_cdr_x ( this_beaming, SCM_EOL);
+ gh_set_cdr_x (this_beaming, SCM_EOL);
+ }
+
+ if (scm_ilength (gh_cdr (this_beaming)) > 0)
+ {
+ last_beaming = this_beaming;
+ last_dir = this_dir;
}
}
}
Real dy = pos.delta ();
Real dydx = dy && dx ? dy/dx : 0;
- Real thick = gh_scm2double (me->get_grob_property ("thickness"));
+ Real thick = get_thickness (me);
Real bdy = get_beam_translation (me);
SCM last_beaming = SCM_EOL;;
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];
Real xposn = st->relative_coordinate (xcommon, X_AXIS);
Real stem_width = gh_scm2double (st->get_grob_property ("thickness")) *lt;
+ /*
+ We do the space left of ST, with lfliebertjes pointing to the
+ right from the left stem, and rfliebertjes pointing left from
+ right stem.
+ */
if (i > 0)
{
SCM left = gh_cdr (last_beaming);
if (lfliebertjes.size() || rfliebertjes.size())
{
-
Real nw_f;
- if (!Stem::first_head (st))
- nw_f = 0;
- else
- {
- int t = Stem::duration_log (st);
- SCM proc = me->get_grob_property ("flag-width-function");
- SCM result = gh_call1 (proc, gh_int2scm (t));
- nw_f = gh_scm2double (result);
- }
+ int t = Stem::duration_log (st);
+
+ SCM proc = me->get_grob_property ("flag-width-function");
+ SCM result = gh_call1 (proc, scm_int2num (t));
+ nw_f = gh_scm2double (result);
+
/* Half beam should be one note-width,
but let's make sure two half-beams never touch */
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);
- the_beam.add_at_edge (Y_AXIS, UP, tm, 5.0);
+ Molecule tm = Text_item::text2molecule (me, scm_makfrom0str (str.to_str0 ()), properties);
+ the_beam.add_at_edge (Y_AXIS, UP, tm, 5.0, 0);
}
#endif
count[UP] = count[DOWN] = 0;
Direction d = DOWN;
- Link_array<Item> stems=
- Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "stems");
for (int i=0; i <stems.size (); i++)
do {
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])));
+ gh_cons (scm_int2num (count[UP]),
+ scm_int2num (count[DOWN])),
+ gh_cons (scm_int2num (total[UP]),
+ scm_int2num (total[DOWN])));
if (gh_number_p (s) && gh_scm2int (s))
return to_dir (s);
void
Beam::set_stem_directions (Grob *me, Direction d)
{
- Link_array<Item> stems
- =Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ Link_array<Grob> stems
+ =Pointer_group_interface__extract_grobs (me, (Grob*) 0, "stems");
for (int i=0; i <stems.size (); i++)
{
Grob *s = stems[i];
- /* For knees, non-forced stems should probably have their
- natural direction. In any case, when knee, beam direction is
- foe. */
- 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);
- }
+
+ SCM forcedir = s->get_grob_property ("direction");
+ if (!to_dir (forcedir))
+ Directional_element_interface::set (s, d);
}
-}
+}
+
+/*
+ A union of intervals in the real line.
-/* Simplistic auto-knees; only consider vertical gap between two
- adjacent chords.
+ Abysmal performance (quadratic) for large N, hopefully we don't have
+ that large N. In any case, this should probably be rewritten to use
+ a balanced tree.
+ */
+struct Int_set
+{
+ Array<Interval> allowed_regions_;
+
+ Int_set()
+ {
+ set_full();
+ }
- This may decide for a knee that's impossible to fit sane scoring
- criteria (eg, stem lengths). We may need something smarter. */
+ void set_full()
+ {
+ allowed_regions_.clear();
+ Interval s;
+ s.set_full ();
+ allowed_regions_.push (s);
+ }
+
+ void remove_interval (Interval rm)
+ {
+ for (int i = 0; i < allowed_regions_.size(); )
+ {
+ Interval s = rm;
+
+ s.intersect (allowed_regions_[i]);
+
+ if (!s.empty_b ())
+ {
+ Interval before = allowed_regions_[i];
+ Interval after = allowed_regions_[i];
+
+ before[RIGHT] = s[LEFT];
+ after[LEFT] = s[RIGHT];
+
+ if (!before.empty_b() && before.length () > 0.0)
+ {
+ allowed_regions_.insert (before, i);
+ i++;
+ }
+ allowed_regions_.del (i);
+ if (!after.empty_b () && after.length () > 0.0)
+ {
+ allowed_regions_.insert (after, i);
+ i++;
+ }
+ }
+ else
+ i++;
+ }
+ }
+};
+
+
+/*
+ Only try horizontal beams for knees. No reliable detection of
+ anything else is possible here, since we don't know funky-beaming
+ settings, or X-distances (slopes!) People that want sloped
+ knee-beams, should set the directions manually.
+ */
void
-Beam::consider_auto_knees (Grob *me, Direction d)
+Beam::consider_auto_knees (Grob* me)
{
SCM scm = me->get_grob_property ("auto-knee-gap");
-
if (!gh_number_p (scm))
- return;
-
- bool knee_b = false;
+ return ;
+
+ Real threshold = gh_scm2double (scm);
- Real staff_space = Staff_symbol_referencer::staff_space (me);
- Real gap = gh_scm2double (scm) / staff_space;
+ Int_set gaps;
+
+ gaps.set_full ();
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 r=1; r < stems.size (); r++)
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+ Array<Interval> hps_array;
+ for (int i=0; i < stems.size (); i++)
{
- if (!Stem::invisible_b (stems[r-1]))
- l = r - 1;
- Grob *right = stems[r];
- Grob *left = stems[l];
- if (Stem::invisible_b (left))
+ Grob* stem = stems[i];
+ if (Stem::invisible_b (stem))
continue;
- if (Stem::invisible_b (right))
- continue;
-
- 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_y - left_y;
-
- if (abs (dy) >= gap)
+ Interval hps = Stem::head_positions (stem);
+ if(!hps.empty_b())
{
- 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)
- {
- Directional_element_interface::set (left, knee_dir);
- left->set_grob_property ("dir-forced", SCM_BOOL_T);
+ hps[LEFT] += -1;
+ hps[RIGHT] += 1;
+ hps *= staff_space * 0.5 ;
- }
- if (!Stem::invisible_b (right)
- && stems[r]->get_grob_property ("dir-forced") != SCM_BOOL_T)
+ /*
+ We could subtract beam Y position, but this routine only
+ sets stem directions, a constant shift does not have an
+ influence.
+
+ */
+ hps += stem->relative_coordinate (common, Y_AXIS);
+
+ if (to_dir (stem->get_grob_property ("direction")))
{
- Directional_element_interface::set (right, -knee_dir);
- right->set_grob_property ("dir-forced", SCM_BOOL_T);
+ Direction stemdir = to_dir (stem->get_grob_property ("direction"));
+ hps[-stemdir] = - stemdir * infinity_f;
}
}
+ hps_array.push (hps);
+
+ gaps.remove_interval (hps);
}
- if (knee_b)
+ Interval max_gap;
+ Real max_gap_len =0.0;
+
+ for (int i = gaps.allowed_regions_.size() -1; i >= 0 ; i--)
{
- 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);
+ Interval gap = gaps.allowed_regions_[i];
+
+ /*
+ the outer gaps are not knees.
+ */
+ if (isinf (gap[LEFT]) || isinf(gap[RIGHT]))
+ continue;
+
+ if (gap.length () >= max_gap_len)
+ {
+ max_gap_len = gap.length();
+ max_gap = gap;
+ }
+ }
+
+ if (max_gap_len > threshold)
+ {
+ int j = 0;
+ for (int i = 0; i < stems.size(); i++)
+ {
+ Grob* stem = stems[i];
+ if (Stem::invisible_b (stem))
+ continue;
+
+ Interval hps = hps_array[j++];
+
+
+ Direction d = (hps.center () < max_gap.center()) ?
+ UP : DOWN ;
+
+ stem->set_grob_property ("direction", scm_int2num (d));
+
+ hps.intersect (max_gap);
+ assert (hps.empty_b () || hps.length () < 1e-6 );
+ }
}
}
+
+
/* Set stem's shorten property if unset.
TODO:
if (knee_b(me))
return ;
- Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
+ Real forced_fraction = 1.0 * forced_stem_count (me)
+ / visible_stem_count (me);
int beam_count = get_beam_count (me);
- SCM shorten = me->get_grob_property ("beamed-stem-shorten");
- if (shorten == SCM_EOL)
+ SCM shorten_list = me->get_grob_property ("beamed-stem-shorten");
+ if (shorten_list == 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 (beam_count <? (sz - 1)));
+
+ SCM shorten_elt =
+ robust_list_ref (beam_count -1, shorten_list);
Real shorten_f = gh_scm2double (shorten_elt) * staff_space;
/* your similar cute comment here */
return SCM_UNSPECIFIED;
}
+
+/*
+ Compute a first approximation to the beam slope.
+ */
MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
SCM
Beam::least_squares (SCM smob)
Grob *fvs = first_visible_stem (me);
Grob *lvs = last_visible_stem (me);
- Interval ideal (Stem::calc_stem_info (fvs).ideal_y_
+ Interval ideal (Stem::get_stem_info (fvs).ideal_y_
+ fvs->relative_coordinate (commony, Y_AXIS) -my_y,
- Stem::calc_stem_info (lvs).ideal_y_
+ Stem::get_stem_info (lvs).ideal_y_
+ lvs->relative_coordinate (commony, Y_AXIS) - my_y);
Real x0 = first_visible_stem (me)->relative_coordinate (commonx, X_AXIS);
Interval chord (Stem::chord_start_y (first_visible_stem (me)),
Stem::chord_start_y (last_visible_stem (me)));
+ /* 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.
- /*
- 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 */
+ For that case, we apply artificial slope */
if (!ideal[LEFT] && chord.delta () && count == 2)
{
-
- /*
- FIXME. -> UP
- */
+ /* FIXME. -> UP */
Direction d = (Direction) (sign (chord.delta ()) * UP);
pos[d] = gh_scm2double (me->get_grob_property ("thickness")) / 2;
- // * dir;
pos[-d] = - pos[d];
}
else
if (Stem::invisible_b (s))
continue;
ideals.push (Offset (x_posns[i],
- Stem::calc_stem_info (s).ideal_y_
+ Stem::get_stem_info (s).ideal_y_
+ s->relative_coordinate (commony, Y_AXIS)
- my_y));
}
Direction d = Stem::get_direction (s);
Real left_y =
- Stem::calc_stem_info (s).shortest_y_
+ Stem::get_stem_info (s).shortest_y_
- dydx * x_posns [i];
/*
concave *= dir;
concaveness2 = concave / (stems.size () - 2);
- /* ugh: this is the a kludge to get
- input/regression/beam-concave.ly to behave as
- baerenreiter. */
+ /*
+
+ ugh: this is the a kludge to get
+ input/regression/beam-concave.ly to behave as
+ baerenreiter.
+
+ */
/*
huh? we're dividing twice (which is not scalable) meaning that
return SCM_UNSPECIFIED;
}
+/*
+ Report slice containing the numbers that are both in (car BEAMING)
+ and (cdr BEAMING)
+ */
Slice
where_are_the_whole_beams(SCM beaming)
{
return l;
}
-/*
- Calculate the Y position of the stem-end, given the Y-left, Y-right
- in POS for stem S. This Y position is relative to S.
- */
+/* Return the Y position of the stem-end, given the Y-left, Y-right
+ in POS for stem S. This Y position is relative to S. */
Real
Beam::calc_stem_y (Grob *me, Grob* s, Grob ** common,
Real xl, Real xr,
&&gh_scm2double (me->get_grob_property ("gap")))
{
gap = true;
- thick = gh_scm2double (me->get_grob_property ("thickness"))
- * Staff_symbol_referencer::staff_space(me);
+ thick = get_thickness(me);
}
// ugh -> use commonx
||(d == RIGHT && i == stems.size () -1))
continue;
-
- SCM beaming_prop = stems[i]->get_grob_property ("beaming");
+ Grob *st = stems[i];
+ SCM beaming_prop = st->get_grob_property ("beaming");
if (beaming_prop == SCM_EOL ||
index_get_cell (beaming_prop, d) == SCM_EOL)
{
int b = beaming->infos_.elem (i).beams_i_drul_[d];
- Stem::set_beaming (stems[i], b, d);
+ if (i>0
+ && i < stems.size() -1
+ && Stem::invisible_b (st))
+ b = b <? beaming->infos_.elem(i).beams_i_drul_[-d];
+
+ Stem::set_beaming (st, b, d);
}
}
while (flip (&d) != LEFT);
if (Stem::invisible_b (s))
continue;
- if (((int)Stem::chord_start_y (s))
+ /* I can imagine counting those boundaries as a half forced stem,
+ but let's count them full for now. */
+ if (abs (Stem::chord_start_y (s)) > 0.1
&& (Stem::get_direction (s) != Stem::get_default_dir (s)))
f++;
}
|| !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 ("positions"));
Interval pos (0, 0);
SCM s = beam->get_grob_property ("positions");
if (gh_pair_p (s) && gh_number_p (ly_car (s)))
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 stem_y = (pos[LEFT]
+ + (stem->relative_coordinate (0, X_AXIS) - x0) * dydx)
+ * d;
+
+ Real beam_translation = get_beam_translation (beam);
+ Real beam_thickness = gh_scm2double (beam->get_grob_property ("thickness"));
+ int beam_count = get_direction_beam_count (beam, d);
+ Real height_of_my_beams = beam_thickness
+ + (beam_count - 1) * beam_translation;
+ Real beam_y = stem_y - height_of_my_beams + beam_thickness / 2.0;
Real staff_space = Staff_symbol_referencer::staff_space (rest);
-
- Real rest_dim = rest->extent (rest, Y_AXIS)[d]*2.0 / staff_space; // refp??
+ /* Better calculate relative-distance directly, rather than using
+ rest_dim? */
+ Grob *common_x = rest->common_refpoint (beam, Y_AXIS);
+ Real rest_dim = rest->extent (common_x, Y_AXIS)[d] / staff_space * d;
- Real minimum_dist
- = gh_scm2double (rest->get_grob_property ("minimum-beam-collision-distance"));
- Real dist =
- minimum_dist + -d * (beamy - rest_dim) >? 0;
+ Real minimum_distance = gh_scm2double
+ (rest->get_grob_property ("minimum-beam-collision-distance"));
+ Real distance = beam_y - rest_dim;
+ Real shift = 0;
+ if (distance < 0)
+ shift = minimum_distance - distance;
+ else if (minimum_distance > distance)
+ shift = minimum_distance - distance;
+
int stafflines = Staff_symbol_referencer::line_count (rest);
- // move discretely by half spaces.
- int discrete_dist = int (ceil (dist));
+ /* Always move discretely by half spaces */
+ Real discrete_shift = ceil (shift * 2.0) / 2.0;
- // move by whole spaces inside the staff.
- if (discrete_dist < stafflines+1)
- discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
+ /* Inside staff, move by whole spaces*/
+ if ((rest->extent (common_x, Y_AXIS)[d] + discrete_shift) * d
+ < stafflines / 2.0
+ ||(rest->extent (common_x, Y_AXIS)[-d] + discrete_shift) * -d
+ < stafflines / 2.0)
+ discrete_shift = ceil (discrete_shift);
- return gh_double2scm (-d * discrete_dist);
+ return gh_double2scm (-d * discrete_shift);
}
bool
-Beam::knee_b (Grob*me)
+Beam::knee_b (Grob* me)
{
SCM k = me->get_grob_property ("knee");
if (gh_boolean_p (k))
bool knee = false;
int d = 0;
for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
- if (d != Directional_element_interface::get (unsmob_grob (ly_car (s))))
- {
- knee = true;
- break;
- }
+ {
+ 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;
}
+int
+Beam::get_direction_beam_count (Grob *me, Direction d )
+{
+ Link_array<Grob>stems =
+ Pointer_group_interface__extract_grobs (me, (Grob*) 0, "stems");
+ int bc = 0;
+
+ for (int i = stems.size (); i--;)
+ {
+ /*
+ Should we take invisible stems into account?
+ */
+ if (Stem::get_direction (stems[i]) == d)
+ bc = bc >? (Stem::beam_multiplicity (stems[i]).length () + 1);
+ }
-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)
+ return bc;
+}
-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.
-",
- "french-beaming position-callbacks concaveness-gap concaveness-threshold dir-function quant-score auto-knee-gap gap chord-tremolo beamed-stem-shorten shorten least-squares-dy damping flag-width-function neutral-direction positions space-function thickness");
+ADD_INTERFACE (Beam, "beam-interface",
+ "A beam. \n\n"
+" "
+"#'thickness= weight of beams, in staffspace "
+" "
+" "
+"We take the least squares line through the ideal-length stems, and "
+"then damp that using "
+" \n"
+" damped = tanh (slope) \n"
+" \n"
+"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. "
+,
+ "knee french-beaming position-callbacks concaveness-gap concaveness-threshold dir-function quant-score auto-knee-gap gap chord-tremolo beamed-stem-shorten shorten least-squares-dy damping flag-width-function neutral-direction positions space-function thickness");
projects / lilypond.git / blobdiff