/*
beam.cc -- implement Beam
-
+
source file of the GNU LilyPond music typesetter
-
- (c) 1997--2000 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]
- * shorter! (now +- 1000 lines)
- * less hairy code
- * move paper vars to scm
- remove *-hs variables, and do all y-position stuff in staff-space.
-*/
+ * 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.
+
+ * Use Number_pair i.s.o Interval to represent (yl, yr).
+
+ */
#include <math.h> // tanh.
#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)
+Beam::add_stem (Grob *me, Grob *s)
{
- Pointer_group_interface:: add_element(me, "stems", s);
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("stems"), s);
s->add_dependency (me);
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)
+Beam::get_multiplicity (Grob *me)
{
int m = 0;
- for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
+ for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
{
- Grob * sc = unsmob_grob (gh_car (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);
+ 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(Beam,before_line_breaking,1);
+/* 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 (Beam, before_line_breaking, 1);
SCM
Beam::before_line_breaking (SCM smob)
{
- Grob * me = unsmob_grob (smob);
-
- // Why?
- /*
- Why what? Why the warning (beams with less than 2 stems are
- degenerate beams, should never happen), or why would this ever
- happen (don't know). */
- if (visible_stem_count (me) < 2)
+ 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)
{
- warning (_ ("beam has less than two stems"));
+ 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 (visible_stem_count (me) >= 1)
+ if (count >= 1)
{
if (!Directional_element_interface::get (me))
Directional_element_interface::set (me, get_default_dir (me));
}
Direction
-Beam::get_default_dir (Grob*me)
+Beam::get_default_dir (Grob *me)
{
Drul_array<int> total;
total[UP] = total[DOWN] = 0;
Direction d = DOWN;
Link_array<Item> stems=
- Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
for (int i=0; i <stems.size (); i++)
do {
total[d] += current;
count[d] ++;
}
-
- } while (flip(&d) != DOWN);
+ } while (flip (&d) != DOWN);
SCM func = me->get_grob_property ("dir-function");
SCM s = gh_call2 (func,
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 ("default-neutral-direction"));
+ /* 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.
- */
+/* 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
-Beam::set_stem_directions (Grob*me)
+Beam::set_stem_directions (Grob *me)
{
Link_array<Item> stems
- =Pointer_group_interface__extract_elements (me, (Item*) 0, "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);
+ Directional_element_interface::set (s, d);
}
}
-/*
- Simplistic auto-knees; only consider vertical gap between two
- adjacent chords.
+/* 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.
- */
+ don't set, or unset auto-knee-gap. */
void
Beam::consider_auto_knees (Grob *me)
{
Direction d = Directional_element_interface::get (me);
Link_array<Item> stems=
- Pointer_group_interface__extract_elements (me, (Item*)0, "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++)
- common = common->common_refpoint (stems[i], Y_AXIS);
-
+ 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++)
{
- Real left = Stem::extremal_heads (stems[i-1])[d]
+ 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]
+ Real right = Stem::extremal_heads (stems[i])[-d]
->relative_coordinate (common, Y_AXIS);
Real dy = right - left;
{
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);
}
}
-/*
- Set stem's shorten property if unset.
+/* Set stem's shorten property if unset.
+
TODO:
- take some y-position (chord/beam/nearest?) into account
- scmify forced-fraction
- */
+ take some y-position (chord/beam/nearest?) into account
+ scmify forced-fraction
+
+ TODO:
+
+ why is shorten stored in beam, and not directly in stem?
+
+*/
void
-Beam::set_stem_shorten (Grob*m)
+Beam::set_stem_shorten (Grob *m)
{
Spanner*me = dynamic_cast<Spanner*> (m);
Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
- if (forced_fraction < 0.5)
- return;
int multiplicity = get_multiplicity (me);
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)));
+ SCM shorten_elt = scm_list_ref (shorten,
+ gh_int2scm (multiplicity <? (sz - 1)));
Real shorten_f = gh_scm2double (shorten_elt) * staff_space;
- /* cute, but who invented me -- how to customise ? */
- if (forced_fraction < 1)
- shorten_f /= 2;
+ /* your similar cute comment here */
+ shorten_f *= forced_fraction;
+
+ me->set_grob_property ("shorten", gh_double2scm (shorten_f));
+}
- Link_array<Item> stems=
- Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+/* 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 (Beam, after_line_breaking, 1);
+SCM
+Beam::after_line_breaking (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ /* Copy to mutable list. */
+ SCM s = ly_deep_copy (me->get_grob_property ("positions"));
+ me->set_grob_property ("positions", s);
- for (int i=0; i < stems.size (); i++)
- {
- Item* s = stems[i];
- if (Stem::invisible_b (s))
- continue;
- if (gh_number_p (s->get_grob_property ("shorten")))
- s->set_grob_property ("shorten", gh_double2scm (shorten_f));
- }
+ 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;
}
+struct Quant_score
+{
+ Real yl;
+ Real yr;
+ Real demerits;
+};
+
+
/*
- Set elt properties height and y-position if not set.
- Adjust stem lengths to reach beam.
- */
-MAKE_SCHEME_CALLBACK(Beam,after_line_breaking,1);
+ 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::after_line_breaking (SCM smob)
+Beam::quanting (SCM smob)
{
- Grob * me = unsmob_grob (smob);
+ Grob *me = unsmob_grob (smob);
- /* first, calculate y, dy */
- Real y, dy;
- calc_default_position_and_height (me, &y, &dy);
- if (visible_stem_count (me))
- {
- if (suspect_slope_b (me, y, dy))
- dy = 0;
+ SCM s = me->get_grob_property ("positions");
+ Real yl = gh_scm2double (gh_car (s));
+ Real yr = gh_scm2double (gh_cdr (s));
- Real damped_dy = calc_slope_damping_f (me, dy);
- Real quantised_dy = quantise_dy_f (me, damped_dy);
+ 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;
- y += (dy - quantised_dy) / 2;
- dy = quantised_dy;
- }
/*
- until here, we used only stem_info, which acts as if dir=up
- */
- y *= Directional_element_interface::get (me);
- dy *= Directional_element_interface::get (me);
+ going to REGION_SIZE == 2, yields another 0.6 second with
+ wtk1-fugue2.
- Real half_space = Staff_symbol_referencer::staff_space (me) / 2;
+ (result indexes between 70 and 575) ? --hwn.
- /* weird: why do we do calc_position_and_height () ? regardless of
- this setting?
+ */
- If the user sets height, we still need to calculate the y-position.
- If the user sets height-hs, we still need to calculate and
- quantise y-position.
+ 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));
+ }
- We use least squares to calculate y-position and height, so we
- inherently always calculate both. */
+ Array<Quant_score> qscores;
- /* check for user-override of dy */
- SCM s = me->remove_grob_property ("height-hs");
- if (gh_number_p (s))
+ 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++)
{
- dy = gh_scm2double (s) * half_space;
+ 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));
}
- me->set_grob_property ("height", gh_double2scm (dy));
- /* check for user-override of y */
- s = me->remove_grob_property ("y-position-hs");
- if (gh_number_p (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--;)
{
- y = gh_scm2double (s) * half_space;
- }
- else
- {
- /* we can modify y, so we should quantise y */
- Real y_shift = check_stem_length_f (me, y, dy);
- y += y_shift;
- y = quantise_y_f (me,y, dy, 0);
- set_stem_length (me, y, dy);
- y_shift = check_stem_length_f (me, y, dy);
-
- if (y_shift > half_space / 4)
+ if (qscores[i].demerits < best)
{
- y += y_shift;
-
- /*
- for significantly lengthened or shortened stems,
- request quanting the other way.
- */
- int quant_dir = 0;
- if (abs (y_shift) > half_space / 2)
- quant_dir = sign (y_shift) * Directional_element_interface::get (me);
- y = quantise_y_f (me, y, dy, quant_dir);
+ best = qscores [i].demerits ;
+ best_idx = i;
}
}
- // UGH. Y is not in staff position unit?
- // Ik dacht datwe daar juist van weg wilden?
- set_stem_length (me, y, dy);
- me->set_grob_property ("y-position", gh_double2scm (y));
+
+
+ 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;
}
-/*
- See Documentation/tex/fonts.doc
- */
-void
-Beam::calc_default_position_and_height (Grob*me,Real* y, Real* dy)
+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)
{
- *y = 0;
- *dy = 0;
- if (visible_stem_count (me) <= 1)
- return;
+ 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 first_ideal = Stem::calc_stem_info (first_visible_stem (me)).idealy_f_;
- if (first_ideal == Stem::calc_stem_info (last_visible_stem (me)).idealy_f_)
+ Real dem = 0.0;
+ if (sign (dy_damp) != sign (dy))
{
- *dy = 0;
- *y = first_ideal;
- return;
+ dem += 800;
}
+
+ dem += 400* (0 >? (fabs (dy) - fabs (dy_mus)));
+
- Array<Offset> ideals;
+ dem += shrink_extra_weight (fabs (dy_damp) - fabs (dy))* 10;
+ return dem;
+}
- // ugh -> use commonx
- Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
- Link_array<Item> stems=
- Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+static Real
+my_modf (Real x)
+{
+ return x - floor (x);
+}
- for (int i=0; i < stems.size (); i++)
+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)
{
- 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 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;
+ }
+ }
}
- Real dydx;
- minimise_least_squares (&dydx, y, ideals); // duh, takes references
+
+ return dem;
+}
- Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
- *dy = dydx * dx;
+
+
+MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
+SCM
+Beam::least_squares (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ int count = visible_stem_count (me);
+ Interval pos (0, 0);
+
+ if (count <= 1)
+ {
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+ return SCM_UNSPECIFIED;
+ }
+
+ Direction dir = Directional_element_interface::get (me);
+
+ 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);
+ pos[d] = gh_scm2double (me->get_grob_property ("thickness")) / 2
+ * dir;
+ pos[-d] = - pos[d];
+ }
+ else
+ {
+ pos = ideal;
+ pos[LEFT] *= dir ;
+ pos[RIGHT] *= dir ;
+ }
+ }
+ 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).ideal_y));
+ }
+ 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;
+ me->set_grob_property ("least-squares-dy", gh_double2scm (dy * dir));
+
+ pos = Interval (y*dir, (y+dy) * dir);
+ }
+
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+ return SCM_UNSPECIFIED;
}
-bool
-Beam::suspect_slope_b (Grob*me, Real y, Real dy)
+MAKE_SCHEME_CALLBACK (Beam, check_concave, 1);
+SCM
+Beam::check_concave (SCM smob)
{
- /* first, calculate y, dy */
- /*
- steep slope running against lengthened stem is suspect
- */
- Real first_ideal = Stem::calc_stem_info (first_visible_stem (me)).idealy_f_;
- Real last_ideal = Stem::calc_stem_info (last_visible_stem (me)).idealy_f_;
- Real lengthened = gh_scm2double (me->get_grob_property ("outer-stem-length-limit"));
- Real steep = gh_scm2double (me->get_grob_property ("slope-limit"));
+ Grob *me = unsmob_grob (smob);
- // 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;
+ 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;
+
+ 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 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;
+ }
+ }
+ }
+
+
+ /* 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 ()));
+
+ 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;
- if (((y - first_ideal > lengthened) && (dydx > steep))
- || ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
+ 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 (concaveness1 || concaveness2 > r2)
{
- return true;
+ 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 false;
+
+ return SCM_UNSPECIFIED;
}
-/*
- This neat trick is by Werner Lemberg,
- damped = tanh (slope)
- corresponds with some tables in [Wanske]
-*/
-Real
-Beam::calc_slope_damping_f (Grob*me,Real dy)
+/* This neat trick is by Werner Lemberg,
+ damped = tanh (slope)
+ corresponds with some tables in [Wanske] CHECKME */
+MAKE_SCHEME_CALLBACK (Beam, slope_damping, 1);
+SCM
+Beam::slope_damping (SCM smob)
{
- SCM damp = me->get_grob_property ("damping");
- int damping = gh_scm2int (damp);
+ 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)
{
- // ugh -> use commonx
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ 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;
- return dydx * dx;
+
+ Real damped_dy = dydx * dx;
+ pos[LEFT] += (dy - damped_dy) / 2;
+ pos[RIGHT] -= (dy - damped_dy) / 2;
+
+ me->set_grob_property ("positions", ly_interval2scm (pos));
}
- return dy;
+ return SCM_UNSPECIFIED;
}
+MAKE_SCHEME_CALLBACK (Beam, end_after_line_breaking, 1);
+SCM
+Beam::end_after_line_breaking (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+ set_stem_lengths (me);
+
+ 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, Real y, Real dy)
+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 thick = gh_scm2double (me->get_grob_property ("thickness"));
+ Real interbeam = get_interbeam (me);
// 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 stem_y = (dy && dx ? (s->relative_coordinate (0, X_AXIS) - x0) / dx * dy : 0) + y;
+ 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;
-}
-
-Real
-Beam::check_stem_length_f (Grob*me,Real y, Real dy)
-{
- Real shorten = 0;
- Real lengthen = 0;
- Direction dir = Directional_element_interface::get (me);
-
- Link_array<Item> stems=
- Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
-
- for (int i=0; i < stems.size(); i++)
+ Direction dir = Directional_element_interface::get (me);
+ Direction sdir = Directional_element_interface::get (s);
+
+ /* knee */
+ if (dir!= sdir)
{
- Item* s = stems[i];
- if (Stem::invisible_b (s))
- continue;
+ stem_y -= dir * (thick / 2 + (beam_multiplicity - 1) * interbeam);
- Real stem_y = calc_stem_y_f (me, s, y, dy);
-
- stem_y *= dir;
- Stem_info info = Stem::calc_stem_info (s);
+ // huh, why not for first visible?
- // if (0 > info.maxy_f_ - stem_y)
- shorten = shorten <? info.maxy_f_ - stem_y;
- // if (0 < info.miny_f_ - stem_y)
- lengthen = lengthen >? info.miny_f_ - stem_y;
+ Grob *last_visible = last_visible_stem (me);
+ if (last_visible)
+ {
+ 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)
- warning (_ ("weird beam vertical offset"));
-
- /* when all stems are too short, normal stems win */
- return dir * ((shorten) ? shorten : lengthen);
+ return stem_y;
}
/*
stem directions and length should set to relative to the chord's
position of the beam. */
void
-Beam::set_stem_length (Grob*me,Real y, Real dy)
+Beam::set_stem_lengths (Grob *me)
{
- Real half_space = Staff_symbol_referencer::staff_space (me)/2;
Link_array<Item> stems=
- Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
- if (stems.size () < 1)
+ if (stems.size () <= 1)
return;
Grob *common = me->common_refpoint (stems[0], Y_AXIS);
for (int i=1; i < stems.size (); i++)
- common = common->common_refpoint (stems[i], Y_AXIS);
+ 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 ("positions"));
+ 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, y, dy);
+ Real stem_y = calc_stem_y (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) / half_space);
+ Stem::set_stemend (s, (stem_y + id) / staff_space * 2);
}
}
-/*
- [Ross] (simplification of)
- Set dy complying with:
- - zero
- - thick / 2 + staffline_f / 2
- - thick + staffline_f
- + n * staff_space
-*/
-Real
-Beam::quantise_dy_f (Grob*me,Real dy)
-{
- Array<Real> a;
-
- SCM proc = me->get_grob_property ("height-quants");
- SCM quants = gh_call2 (proc, me->self_scm (),
- gh_double2scm (me->paper_l ()->get_var ("stafflinethickness")
- / 1.0));
-
-
- for (SCM s = quants; gh_pair_p (s); s = gh_cdr (s))
- a.push (gh_scm2double (gh_car (s)));
-
- if (a.size () <= 1)
- return dy;
-
- Real staff_space = Staff_symbol_referencer::staff_space (me);
-
- Interval iv = quantise_iv (a, abs (dy)/staff_space) * staff_space;
- Real q = (abs (dy) - iv[SMALLER] <= iv[BIGGER] - abs (dy))
- ? iv[SMALLER]
- : iv[BIGGER];
-
- return q * sign (dy);
-}
-
-/*
- Prevent interference from stafflines and beams.
- See Documentation/tex/fonts.doc
-
- We only need to quantise the (left) y-position of the beam,
- since dy is quantised too.
- if extend_b then stems must *not* get shorter
- */
-Real
-Beam::quantise_y_f (Grob*me,Real y, Real dy, int 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 (),
- gh_list (gh_int2scm (multiplicity),
- gh_double2scm (dy/staff_space),
- gh_double2scm (thick/staff_space),
- SCM_EOL, SCM_UNDEFINED));
-
- Array<Real> a;
-
- for (; gh_pair_p (quants); quants = gh_cdr (quants))
- a.push (gh_scm2double (gh_car (quants)));
-
- if (a.size () <= 1)
- return y;
-
- Real up_y = Directional_element_interface::get (me) * y;
- Interval iv = quantise_iv (a, up_y/staff_space) * staff_space;
-
- Real q = up_y - iv[SMALLER] <= iv[BIGGER] - up_y
- ? iv[SMALLER] : iv[BIGGER];
- if (quant_dir)
- q = iv[(Direction)quant_dir];
-
- return q * Directional_element_interface::get (me);
-}
-
void
-Beam::set_beaming (Grob*me,Beaming_info_list *beaming)
+Beam::set_beaming (Grob *me, Beaming_info_list *beaming)
{
Link_array<Grob> stems=
- Pointer_group_interface__extract_elements (me, (Grob*)0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Grob *)0, "stems");
Direction d = LEFT;
- for (int i=0; i < stems.size(); i++)
+ for (int i=0; i < stems.size (); i++)
{
do
{
/* Don't overwrite user override (?) */
- if (Stem::beam_count (stems[i], d) == 0
+ 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))
FIXME: clean me up.
*/
Molecule
-Beam::stem_beams (Grob*me,Item *here, Item *next, Item *prev)
+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");
-
- Real staffline_f = me->paper_l ()->get_var ("stafflinethickness");
- 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 stemdx = staffline_f;
-
- // ugh -> use commonx
- Real dx = visible_stem_count (me) ?
- last_visible_stem (me)->relative_coordinate (0, X_AXIS) - first_visible_stem (me)->relative_coordinate (0, X_AXIS)
- : 0.0;
- Real dy = gh_scm2double (me->get_grob_property ("height"));
- Real dydx = dy && dx ? dy/dx : 0;
-
+ 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");
+
+ Real thick = gh_scm2double (me->get_grob_property ("thickness"));
+ Real bdy = get_interbeam (me);
+
Molecule leftbeams;
Molecule rightbeams;
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
- */
- Real w = here->relative_coordinate (0, X_AXIS) - prev->relative_coordinate (0, X_AXIS);
+ 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 ("linethickness");
+
w = w/2 <? nw_f;
Molecule a;
if (lhalfs) // generates warnings if not
- a = Lookup::beam (dydx, w, thick);
+ 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);
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) ;
+ 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 ("linethickness");
- Real w = next->relative_coordinate (0, X_AXIS) - here->relative_coordinate (0, X_AXIS);
- Molecule a = Lookup::beam (dydx, w + stemdx, thick);
- a.translate_axis( - stemdx/2, X_AXIS);
+ 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 gap_i = gh_scm2int ((gap));
int nogap = rwholebeams - gap_i;
for (; j < nogap; j++)
b.translate_axis (-dir * bdy * j, Y_AXIS);
rightbeams.add_molecule (b);
}
- // TODO: notehead widths differ for different types
- gap_f = nw_f / 2;
+ if (Stem::invisible_b (here))
+ gap_f = nw_f;
+ else
+ gap_f = nw_f / 2;
w -= 2 * gap_f;
- a = Lookup::beam (dydx, w + stemdx, thick);
+ a = Lookup::beam (dydx, w + stem_w, thick);
}
for (; j < rwholebeams; j++)
{
Molecule b (a);
- b.translate (Offset (Stem::invisible_b (here) ? 0 : gap_f, -dir * bdy * j));
+ 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);
}
}
leftbeams.add_molecule (rightbeams);
- /*
- Does beam quanting think of the asymetry of beams?
- Refpoint is on bottom of symbol. (FIXTHAT) --hwn.
- */
+ /* Does beam quanting think of the asymetry of beams?
+ Refpoint is on bottom of symbol. (FIXTHAT) --hwn. */
return leftbeams;
}
-/*
- TODO: it would be nice to introduce y-position via callbacks.
- */
-MAKE_SCHEME_CALLBACK(Beam,brew_molecule,1);
+MAKE_SCHEME_CALLBACK (Beam, brew_molecule, 1);
SCM
Beam::brew_molecule (SCM smob)
{
- Grob * me =unsmob_grob (smob);
+ Grob *me =unsmob_grob (smob);
Molecule mol;
if (!gh_pair_p (me->get_grob_property ("stems")))
return SCM_EOL;
- Real x0,dx;
+ Real x0, dx;
Link_array<Item>stems =
- Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
if (visible_stem_count (me))
{
- // ugh -> use commonx
+ // 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;
+ dx = stems.top ()->relative_coordinate (0, X_AXIS) - x0;
}
-
-
- Real dy = gh_scm2double (me->get_grob_property ("height"));
- Real dydx = dy && dx ? dy/dx : 0;
- Real y = gh_scm2double (me->get_grob_property ("y-position"));
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real dy = pos.delta ();
+ Real dydx = dy && dx ? dy/dx : 0;
- for (int j=0; j <stems.size (); j++)
+ for (int i=0; i < stems.size (); i++)
{
- Item *i = stems[j];
- Item * prev = (j > 0)? stems[j-1] : 0;
- Item * next = (j < stems.size()-1) ? stems[j+1] :0;
+ 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, i, next, prev);
- Real x = i->relative_coordinate (0, X_AXIS)-x0;
- sb.translate (Offset (x, x * dydx + y));
+ 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);
+ - dynamic_cast<Spanner*> (me)
+ ->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 ();
}
int
-Beam::forced_stem_count (Grob*me)
+Beam::forced_stem_count (Grob *me)
{
Link_array<Item>stems =
- Pointer_group_interface__extract_elements ( me, (Item*) 0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
int f = 0;
for (int i=0; i < stems.size (); i++)
{
continue;
if (((int)Stem::chord_start_f (s))
- && (Stem::get_direction (s ) != Stem::get_default_dir (s )))
+ && (Stem::get_direction (s) != Stem::get_default_dir (s)))
f++;
}
return f;
-/* TODO:
- use filter and standard list functions.
- */
int
-Beam::visible_stem_count (Grob*me)
+Beam::visible_stem_count (Grob *me)
{
Link_array<Item>stems =
- Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
int c = 0;
for (int i = stems.size (); i--;)
{
}
Item*
-Beam::first_visible_stem(Grob*me)
+Beam::first_visible_stem (Grob *me)
{
Link_array<Item>stems =
- Pointer_group_interface__extract_elements ( me, (Item*) 0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
for (int i = 0; i < stems.size (); i++)
{
}
Item*
-Beam::last_visible_stem(Grob*me)
+Beam::last_visible_stem (Grob *me)
{
Link_array<Item>stems =
- Pointer_group_interface__extract_elements ( me, (Item*) 0, "stems");
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
for (int i = stems.size (); i--;)
{
if (!Stem::invisible_b (stems[i]))
/*
[TODO]
+
handle rest under beam (do_post: beams are calculated now)
what about combination of collisions and rest under beam.
rest -> stem -> beam -> interpolate_y_position ()
*/
-MAKE_SCHEME_CALLBACK(Beam,rest_collision_callback,2);
+MAKE_SCHEME_CALLBACK (Beam, rest_collision_callback, 2);
SCM
Beam::rest_collision_callback (SCM element_smob, SCM axis)
{
assert (a == Y_AXIS);
- Grob * st = unsmob_grob (rest->get_grob_property ("stem"));
- Grob * stem = st;
+ 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 || !Beam::has_interface (beam) || !Beam::visible_stem_count (beam))
+ Grob *beam = unsmob_grob (stem->get_grob_property ("beam"));
+ if (!beam
+ || !Beam::has_interface (beam)
+ || !Beam::visible_stem_count (beam))
return gh_double2scm (0.0);
// make callback for rest from this.
- Real beam_dy = 0;
- Real beam_y = 0;
+ // 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)))
+ pos = ly_scm2interval (s);
- // todo: make sure this calced already.
- SCM s = beam->get_grob_property ("height");
- if (gh_number_p (s))
- beam_dy = gh_scm2double (s);
-
- s = beam->get_grob_property ("y-position");
- if (gh_number_p (s))
- beam_y = gh_scm2double (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 = beam_dy && dx ? beam_dy/dx : 0;
-
+ 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 + beam_y;
+ 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??
+ 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"));
if (discrete_dist < stafflines+1)
discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
- return gh_double2scm (-d * discrete_dist);
+ return gh_double2scm (-d * discrete_dist);
}
bool
-Beam::has_interface (Grob*me)
+Beam::has_interface (Grob *me)
{
return me->has_interface (ly_symbol2scm ("beam-interface"));
}
-void
-Beam::set_interface (Grob*me)
-{
- /*
- why the init? No way to tell difference between default and user
- override. */
- me->set_grob_property ("height", gh_int2scm (0)); // ugh.
- me->set_grob_property ("y-position" ,gh_int2scm (0));
- me->set_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");
+