/*
beam.cc -- implement Beam
-
+
source file of the GNU LilyPond music typesetter
-
- (c) 1997--1999 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]
- * less hairy code
- * move paper vars to scm
-*/
+ * 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.
+
+ */
+
+
+#include <math.h> // tanh.
+
+#include "molecule.hh"
+#include "directional-element-interface.hh"
#include "beaming.hh"
-#include "dimensions.hh"
#include "beam.hh"
#include "misc.hh"
-#include "debug.hh"
-#include "leastsquares.hh"
+#include "least-squares.hh"
#include "stem.hh"
#include "paper-def.hh"
#include "lookup.hh"
#include "group-interface.hh"
#include "staff-symbol-referencer.hh"
-#include "cross-staff.hh"
+#include "item.hh"
+#include "spanner.hh"
+#include "warn.hh"
+#include "text-item.hh" // debug output.
+#include "font-interface.hh" // debug output.
+
+
-Beam::Beam ()
+static Real
+shrink_extra_weight (Real x)
{
- Group_interface g (this, "stems");
- g.set_interface ();
+ return fabs (x) * ((x < 0) ? 1.5 : 1.0);
}
void
-Beam::add_stem (Stem*s)
+Beam::add_stem (Grob *me, Grob *s)
{
- Group_interface gi (this, "stems");
- gi.add_element (s);
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("stems"), s);
- s->add_dependency (this);
+ s->add_dependency (me);
- assert (!s->beam_l ());
- s->set_elt_property ("beam", self_scm_);
+ assert (!Stem::beam_l (s));
+ s->set_grob_property ("beam", me->self_scm ());
- if (!spanned_drul_[LEFT])
- set_bounds (LEFT,s);
- else
- set_bounds (RIGHT,s);
+ add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
+}
+
+Real
+Beam::get_interbeam (Grob *me)
+{
+ Real slt = me->paper_l ()->get_var ("stafflinethickness");
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ Real thickness = gh_scm2double (me->get_grob_property ("thickness"))
+ * ss;
+
+ int multiplicity = get_multiplicity (me);
+ Real interbeam = multiplicity < 4
+ ? (2*ss + slt - thickness) / 2.0
+ : (3*ss + slt - thickness) / 3.0;
+
+ return interbeam;
}
int
-Beam::get_multiplicity () const
+Beam::get_multiplicity (Grob *me)
{
int m = 0;
- for (SCM s = get_elt_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))
{
- Score_element * sc = unsmob_element (gh_car (s));
+ Grob *sc = unsmob_grob (ly_car (s));
- if (Stem * st = dynamic_cast<Stem*> (sc))
- m = m >? st->beam_count (LEFT) >? st->beam_count (RIGHT);
+ if (Stem::has_interface (sc))
+ 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'.]
- */
-void
-Beam::do_pre_processing ()
+/* 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)
{
- // Why?
- if (visible_stem_count () < 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"));
- set_elt_property ("transparent", SCM_BOOL_T);
- }
+ me->warning (_ ("beam has less than two visible stems"));
- if (!get_direction ())
- set_direction (get_default_dir ());
+ SCM stems = me->get_grob_property ("stems");
+ if (scm_ilength (stems) == 1)
+ {
+ me->warning (_ ("Beam has less than two stems. Removing beam."));
- auto_knees ();
- set_stem_directions ();
+ unsmob_grob (gh_car (stems))->remove_grob_property ("beam");
+ me->suicide ();
- set_stem_shorten ();
+ return SCM_UNSPECIFIED;
+ }
+ else if (scm_ilength (stems) == 0)
+ {
+ me->suicide ();
+ return SCM_UNSPECIFIED;
+ }
+ }
+ if (count >= 1)
+ {
+ if (!Directional_element_interface::get (me))
+ Directional_element_interface::set (me, get_default_dir (me));
+
+ consider_auto_knees (me);
+ set_stem_directions (me);
+ set_stem_shorten (me);
+ }
+ return SCM_EOL;
}
-/*
- FIXME
- */
Direction
-Beam::get_default_dir () const
+Beam::get_default_dir (Grob *me)
{
Drul_array<int> total;
total[UP] = total[DOWN] = 0;
count[UP] = count[DOWN] = 0;
Direction d = DOWN;
- for (int i=0; i <stem_count (); i++)
- do { // HUH -- waar slaat dit op?
- Stem *s = stem (i);
- int current = s->get_direction ()
- ? (1 + d * s->get_direction ())/2
- : s->get_center_distance ((Direction)-d);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ for (int i=0; i <stems.size (); i++)
+ do {
+ Grob *s = stems[i];
+ Direction sd = Directional_element_interface::get (s);
+ int current = sd ? (1 + d * sd)/2
+ : Stem::get_center_distance (s, (Direction)-d);
if (current)
{
total[d] += current;
count[d] ++;
}
-
- } while (flip(&d) != DOWN);
+ } while (flip (&d) != DOWN);
- /*
- [Ross] states that the majority of the notes dictates the
- direction (and not the mean of "center distance")
-
- But is that because it really looks better, or because he wants
- to provide some real simple hands-on rules?
-
- We have our doubts, so we simply provide all sensible alternatives.
-
- If dir is not determined: up (see stem::get_default_dir ()) */
-
- Direction beam_dir = CENTER;
- Direction neutral_dir = (Direction)(int)paper_l ()->get_var ("stem_default_neutral_direction");
-
- SCM a = get_elt_property ("beam-dir-algorithm");
+ 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])));
+
+ if (gh_number_p (s) && gh_scm2int (s))
+ return to_dir (s);
- if (a == ly_symbol2scm ("majority")) // should get default from paper.
- beam_dir = (count[UP] == count[DOWN]) ? neutral_dir
- : (count[UP] > count[DOWN]) ? UP : DOWN;
- else if (a == ly_symbol2scm ("mean"))
- // mean center distance
- beam_dir = (total[UP] == total[DOWN]) ? neutral_dir
- : (total[UP] > total[DOWN]) ? UP : DOWN;
- else if (a == ly_symbol2scm ("median"))
- {
- // median center distance
- if (count[DOWN] && count[UP])
- {
- beam_dir = (total[UP] / count[UP] == total[DOWN] / count[DOWN])
- ? neutral_dir
- : (total[UP] / count[UP] > total[DOWN] / count[DOWN]) ? UP : DOWN;
- }
- else
- {
- beam_dir = (count[UP] == count[DOWN]) ? neutral_dir
- : (count[UP] > count[DOWN]) ? UP : DOWN;
- }
- }
-
- return beam_dir;
+ /* 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 ()
+Beam::set_stem_directions (Grob *me)
{
- Direction d = get_direction ();
- for (int i=0; i <stem_count (); i++)
+ Link_array<Item> 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++)
{
- Stem *s = stem (i);
- SCM force = s->remove_elt_property ("dir-forced");
+ Grob *s = stems[i];
+ SCM force = s->remove_grob_property ("dir-forced");
if (!gh_boolean_p (force) || !gh_scm2bool (force))
- s->set_direction (d);
+ Directional_element_interface::set (s, d);
}
}
-void
-Beam::auto_knees ()
-{
- if (!auto_knee ("auto-interstaff-knee-gap", true))
- auto_knee ("auto-knee-gap", false);
-}
-
-/*
- 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 autoKneeGap/autoInterstaffKneeGap.
- */
-bool
-Beam::auto_knee (String gap_str, bool interstaff_b)
+ don't set, or unset auto-knee-gap. */
+void
+Beam::consider_auto_knees (Grob *me)
{
- bool knee_b = false;
- int knee_y = 0;
- SCM gap = get_elt_property (gap_str);
- if (gh_number_p (gap))
+ SCM scm = me->get_grob_property ("auto-knee-gap");
+
+ if (gh_number_p (scm))
{
- int auto_gap_i = gh_scm2int (gap);
- for (int i=1; i < stem_count (); i++)
+ bool knee_b = false;
+ Real knee_y = 0;
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real gap = gh_scm2double (scm) / staff_space;
+
+ Direction d = Directional_element_interface::get (me);
+ Link_array<Item> 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++)
+ 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++)
{
- bool is_b = (bool)(calc_interstaff_dist (stem (i), this)
- - calc_interstaff_dist (stem (i-1), this));
- int l_y = (int)(stem (i-1)->chord_start_f ())
- + (int)calc_interstaff_dist (stem (i-1), this);
- int r_y = (int)(stem (i)->chord_start_f ())
- + (int)calc_interstaff_dist (stem (i), this);
- int gap_i = r_y - l_y;
-
- if ((abs (gap_i) >= auto_gap_i) && (!interstaff_b || is_b))
+ 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]
+ ->relative_coordinate (common, Y_AXIS);
+
+ Real dy = right - left;
+
+ if (abs (dy) >= gap)
{
- knee_y = (r_y + l_y) / 2;
+ knee_y = (right + left) / 2;
knee_b = true;
break;
}
}
- }
- if (knee_b)
- {
- for (int i=0; i < stem_count (); i++)
- {
- int y = (int)(stem (i)->chord_start_f ())
- + (int)calc_interstaff_dist (stem (i), this);
- stem (i)->set_direction (y < knee_y ? UP : DOWN);
- stem (i)->set_elt_property ("dir-forced", SCM_BOOL_T);
+
+ if (knee_b)
+ {
+ 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);
+
+ Directional_element_interface::set (s, y < knee_y ? UP : DOWN);
+ s->set_grob_property ("dir-forced", SCM_BOOL_T);
+ }
}
}
- return knee_b;
}
-/*
- Set stem's shorten property if unset.
- TODO: take some y-position (nearest?) into account
- */
+/* Set stem's shorten property if unset.
+ TODO:
+ take some y-position (chord/beam/nearest?) into account
+ scmify forced-fraction */
void
-Beam::set_stem_shorten ()
+Beam::set_stem_shorten (Grob *m)
{
- if (!visible_stem_count ())
- return;
+ Spanner*me = dynamic_cast<Spanner*> (m);
- Real forced_fraction = forced_stem_count () / visible_stem_count ();
- if (forced_fraction < 0.5)
- return;
+ Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
- int multiplicity = get_multiplicity ();
- SCM shorten = scm_eval (scm_listify (
- ly_symbol2scm ("beamed-stem-shorten"),
- gh_int2scm (multiplicity),
- SCM_UNDEFINED));
- Real shorten_f = gh_scm2double (shorten)
- * Staff_symbol_referencer_interface (this).staff_space ();
+ int multiplicity = get_multiplicity (me);
- /* cute, but who invented this -- how to customise ? */
- if (forced_fraction < 1)
- shorten_f /= 2;
+ SCM shorten = me->get_grob_property ("beamed-stem-shorten");
+ if (shorten == SCM_EOL)
+ return;
- for (int i=0; i < stem_count (); i++)
- {
- Stem* s = stem (i);
- if (s->invisible_b ())
- continue;
- if (gh_number_p (s->get_elt_property ("shorten")))
- s->set_elt_property ("shorten", gh_double2scm (shorten_f));
- }
+ 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)));
+ Real shorten_f = gh_scm2double (shorten_elt) * staff_space;
+
+ /* your similar cute comment here */
+ shorten_f *= forced_fraction;
+
+ me->set_grob_property ("shorten", gh_double2scm (shorten_f));
}
-/*
- Set elt properties height and y-position if not set.
- Adjust stem lengths to reach beam.
- */
-void
-Beam::do_post_processing ()
+
+/* 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)
{
- /* first, calculate y, dy */
- Real y, dy;
- calc_position_and_height (&y, &dy);
- if (suspect_slope_b (y, dy))
- dy = 0;
-
- Real damped_dy = calc_slope_damping_f (dy);
- Real quantised_dy = quantise_dy_f (damped_dy);
-
- y += (dy - quantised_dy) / 2;
- dy = quantised_dy;
-
- /*
- until here, we used only stem_info, which acts as if dir=up
- */
- y *= get_direction ();
- dy *= get_direction ();
-
- /* set or read dy as necessary */
- SCM s = get_elt_property ("height");
- if (gh_number_p (s))
- dy = gh_scm2double (s);
- else
- set_elt_property ("height", gh_double2scm (dy));
+ 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);
- /* set or read y as necessary */
- s = get_elt_property ("y-position");
- if (gh_number_p (s))
- {
- y = gh_scm2double (s);
- set_stem_length (y, dy);
- }
- else
- {
- /* we can modify y, so we should quantise y */
- Real y_shift = check_stem_length_f (y, dy);
- y += y_shift;
- y = quantise_y_f (y, dy, 0);
- set_stem_length (y, dy);
- y_shift = check_stem_length_f (y, dy);
-
- Real internote_f = paper_l ()->get_var ("interline") / 2;
- if (y_shift > internote_f / 4)
- {
- y += y_shift;
-
- /*
- for significantly lengthened or shortened stems,
- request quanting the other way.
- */
- int quant_dir = 0;
- if (abs (y_shift) > internote_f / 2)
- quant_dir = sign (y_shift) * get_direction ();
- y = quantise_y_f (y, dy, quant_dir);
- set_stem_length (y, dy);
- }
+ if (ly_car (s) != SCM_BOOL_F)
+ return SCM_UNSPECIFIED;
- set_elt_property ("y-position", gh_double2scm (y));
- }
+ 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;
+};
+
/*
- See Documentation/tex/fonts.doc
+ TODO:
+ - Make all demerits customisable
+ - One sensible check per demerit
+ - Add demerits for quants per se, as to forbid a specific quant
+ entirely
*/
-void
-Beam::calc_position_and_height (Real* y, Real* dy) const
+MAKE_SCHEME_CALLBACK (Beam, quanting, 1);
+SCM
+Beam::quanting (SCM smob)
{
- *y = *dy = 0;
- if (visible_stem_count () <= 1)
- return;
+ 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 ("stafflinethickness") / ss;
+
+ 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;
+
+ const int REGION_SIZE = 3;
+ // -> result indexes between 70 and 575
+ 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);
+ }
+
- Real first_ideal = first_visible_stem ()->calc_stem_info ().idealy_f_;
- if (first_ideal == last_visible_stem ()->calc_stem_info ().idealy_f_)
+ SCM score_funcs = me->get_grob_property ("quant-score-functions");
+ for (SCM s = score_funcs; gh_pair_p (s); s = gh_cdr (s))
{
- *dy = 0;
- *y = first_ideal;
- return;
+ SCM f = gh_car (s);
+ for (int i = qscores.size (); i--;)
+ {
+ // best scores < 30;
+ // if (qscores[i].demerits < 1000)
+ if (qscores[i].demerits < 100)
+ {
+ SCM score = gh_call3 (f,
+ me->self_scm (),
+ gh_double2scm (qscores[i].yl),
+ gh_double2scm (qscores[i].yr));
+
+ qscores[i].demerits += gh_scm2double (score);
+ }
+ }
}
-
- Least_squares ls;
- Real x0 = first_visible_stem ()->hpos_f ();
- for (int i=0; i < stem_count (); i++)
+
+ Real best = 1e6;
+ int best_idx = -1;
+ for (int i = qscores.size (); i--;)
{
- Stem* s = stem (i);
- if (s->invisible_b ())
- continue;
- ls.input.push (Offset (s->hpos_f () - x0,
- s->calc_stem_info ().idealy_f_));
+ if (qscores[i].demerits < best)
+ {
+ best = qscores [i].demerits ;
+ best_idx = i;
+ }
}
- Real dydx;
- ls.minimise (dydx, *y); // duh, takes references
- Real dx = last_visible_stem ()->hpos_f () - x0;
- *dy = dydx * dx;
+
+ me->set_grob_property ("positions",
+ gh_cons (gh_double2scm (qscores[best_idx].yl),
+ gh_double2scm (qscores[best_idx].yr))
+ );
+
+ if (0)
+ {
+ // 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;
}
-bool
-Beam::suspect_slope_b (Real y, Real dy) const
+MAKE_SCHEME_CALLBACK (Beam, score_slopes_dy, 3);
+SCM
+Beam::score_slopes_dy (SCM smob, SCM syl, SCM syr)
{
- /*
- steep slope running against lengthened stem is suspect
- */
- Real first_ideal = first_visible_stem ()->calc_stem_info ().idealy_f_;
- Real last_ideal = last_visible_stem ()->calc_stem_info ().idealy_f_;
- Real lengthened = paper_l ()->get_var ("beam_lengthened");
- Real steep = paper_l ()->get_var ("beam_steep_slope");
+ Grob*me = unsmob_grob (smob);
+ Real yl = gh_scm2double (syl);
+ Real yr = gh_scm2double (syr);
+ Real dy = yr - yl;
+
+ SCM sdy = me->get_grob_property ("least-squares-dy");
+ SCM posns = me->get_grob_property ("positions");
- Real dx = last_visible_stem ()->hpos_f () - first_visible_stem ()->hpos_f ();
- Real dydx = dy/dx;
+ Real dy_mus = gh_number_p (sdy) ? gh_scm2double (sdy) : 0.0;
+ Real dy_damp = - gh_scm2double (gh_car (posns)) + gh_scm2double (gh_cdr (posns));
- if (((y - first_ideal > lengthened) && (dydx > steep))
- || ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
+ Real dem = 0.0;
+ if (sign (dy_damp) != sign (dy))
{
- return true;
+ dem += 800;
}
- return false;
+
+ dem += 400* (0 >? (fabs (dy) - fabs (dy_mus)));
+
+
+ dem += shrink_extra_weight (fabs (dy_damp) - fabs (dy))* 10;
+ return gh_double2scm (dem);
}
-/*
- This neat trick is by Werner Lemberg,
- damped = tanh (slope)
- corresponds with some tables in [Wanske]
-*/
-Real
-Beam::calc_slope_damping_f (Real dy) const
+MAKE_SCHEME_CALLBACK (Beam, score_stem_lengths, 3);
+SCM
+Beam::score_stem_lengths (SCM smob, SCM syl, SCM syr)
{
- SCM damp = get_elt_property ("damping"); // remove?
- int damping = 1; // ugh.
- if (gh_number_p (damp))
- damping = gh_scm2int (damp);
+ Grob*me = unsmob_grob (smob);
+ Real yl = gh_scm2double (syl);
+ Real yr = gh_scm2double (syr);
- if (damping)
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ Real demerit_score = 0.0 ;
+
+ for (int i=0; i < stems.size (); i++)
{
- Real dx = last_visible_stem ()->hpos_f ()
- - first_visible_stem ()->hpos_f ();
- Real dydx = dy/dx;
- dydx = 0.6 * tanh (dydx) / damping;
- return dydx * dx;
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+
+ Real current_y = calc_stem_y (me, s, Interval (yl, yr));
+ Stem_info info = Stem::calc_stem_info (s);
+ Direction d = Directional_element_interface::get (s);
+
+ 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);
}
- return dy;
+
+ demerit_score *= 2.0 /stems.size ();
+
+ return gh_double2scm (demerit_score);
}
-Real
-Beam::calc_stem_y_f (Stem* s, Real y, Real dy) const
+static Real
+my_modf (Real x)
{
- Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));
- int multiplicity = get_multiplicity ();
+ return x - floor (x);
+}
- Real interbeam_f = paper_l ()->interbeam_f (multiplicity);
- Real x0 = first_visible_stem ()->hpos_f ();
- Real dx = last_visible_stem ()->hpos_f () - x0;
- Real stem_y = (s->hpos_f () - x0) / dx * dy + y;
- /* knee */
- if (get_direction () != s->get_direction ())
+MAKE_SCHEME_CALLBACK (Beam, score_forbidden_quants, 3);
+SCM
+Beam::score_forbidden_quants (SCM smob, SCM syl, SCM syr)
+{
+ Grob*me = unsmob_grob (smob);
+ Real yl = gh_scm2double (syl);
+ Real yr = gh_scm2double (syr);
+ Real dy = yr - yl;
+ Real rad = Staff_symbol_referencer::staff_radius (me);
+ 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;
+
+
+ int multiplicity = get_multiplicity (me);
+ // todo: use multiplicity of outer stems.
+ if (multiplicity >= 2)
{
- stem_y -= get_direction () * (beam_f / 2
- + (multiplicity - 1) * interbeam_f);
+ Real slt = me->paper_l ()->get_var ("stafflinethickness");
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ 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;
+
+ 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;
+
+ // hmm, without Interval/Drul_array, you get ~ 4x same code...
+ if (fabs (yl - dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy <= 1e-3
+ && fabs (my_modf (yl) - sit) < 1e-3)
+ dem += 15;
+
+ if (dir == DOWN && dy >= 1e-3
+ && fabs (my_modf (yl) - hang) < 1e-3)
+ dem += 15;
+ }
- Staff_symbol_referencer_interface me (s);
- Staff_symbol_referencer_interface last (last_visible_stem ());
+ if (fabs (yr - dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy >= 1e-3
+ && fabs (my_modf (yr) - sit) < 1e-3)
+ dem += 15;
+
+ if (dir == DOWN && dy <= 1e-3
+ && fabs (my_modf (yr) - hang) < 1e-3)
+ dem += 15;
+ }
- if ((s != first_visible_stem ())
- && me.staff_symbol_l () != last.staff_symbol_l ())
- stem_y += get_direction ()
- * (multiplicity - (s->flag_i () - 2) >? 0) * interbeam_f;
+ if (multiplicity >= 3)
+ {
+ if (fabs (yl - 2 * dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy <= 1e-3
+ && fabs (my_modf (yl) - straddle) < 1e-3)
+ dem += 15;
+
+ if (dir == DOWN && dy >= 1e-3
+ && fabs (my_modf (yl) - straddle) < 1e-3)
+ dem += 15;
+ }
+
+ if (fabs (yr - 2 * dir * interbeam) < rad + inter)
+ {
+ if (dir == UP && dy >= 1e-3
+ && fabs (my_modf (yr) - straddle) < 1e-3)
+ dem += 15;
+
+ if (dir == DOWN && dy <= 1e-3
+ && fabs (my_modf (yr) - straddle) < 1e-3)
+ dem += 15;
+ }
+ }
}
- return stem_y;
+
+ return gh_double2scm ( dem);
}
-Real
-Beam::check_stem_length_f (Real y, Real dy) const
+
+
+MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
+SCM
+Beam::least_squares (SCM smob)
{
- Real shorten = 0;
- Real lengthen = 0;
- for (int i=0; i < stem_count (); i++)
+ Grob *me = unsmob_grob (smob);
+
+ int count = visible_stem_count (me);
+ Interval pos (0, 0);
+
+ if (count <= 1)
{
- Stem* s = stem (i);
- if (s->invisible_b ())
- continue;
+ me->set_grob_property ("positions", ly_interval2scm (pos));
+ return SCM_UNSPECIFIED;
+ }
+
+ Direction dir = Directional_element_interface::get (me);
- Real stem_y = calc_stem_y_f (s, y, dy);
-
- stem_y *= get_direction ();
- Stem_info info = s->calc_stem_info ();
+ 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)));
- if (stem_y > info.maxy_f_)
- shorten = shorten <? info.maxy_f_ - stem_y;
- if (stem_y < info.miny_f_)
- lengthen = lengthen >? info.miny_f_ - stem_y;
+ /*
+ 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;
- if (lengthen && shorten)
- warning (_ ("weird beam vertical offset"));
+ // 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");
- /* when all stems are too short, normal stems win */
- if (shorten)
- return shorten * get_direction ();
- else
- return lengthen * get_direction ();
+ 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;
}
-void
-Beam::set_stem_length (Real y, Real dy)
+MAKE_SCHEME_CALLBACK (Beam, check_concave, 1);
+SCM
+Beam::check_concave (SCM smob)
{
- Real internote_f = paper_l ()->get_var ("interline") / 2;
- for (int i=0; i < stem_count (); i++)
+ Grob *me = unsmob_grob (smob);
+
+ Link_array<Item> stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size ();)
{
- Stem* s = stem (i);
- if (s->invisible_b ())
- continue;
+ if (Stem::invisible_b (stems[i]))
+ stems.del (i);
+ else
+ i++;
+ }
+
+ 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++)
+ {
+ 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 stem_y = calc_stem_y_f (s, y, dy);
+ Direction dir = Directional_element_interface::get (me);
+ concave *= dir;
+
+ 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"));
- /* caution: stem measures in staff-positions */
- s->set_stemend ((stem_y - calc_interstaff_dist (s, this)) / internote_f);
+ /* TODO: some sort of damping iso -> plain horizontal */
+ if (concaveness > r)
+ {
+ 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;
}
-/*
- [Ross] (simplification of)
- Try to set dy complying with:
- - zero
- - beam_f / 2 + staffline_f / 2
- - beam_f + staffline_f
- + n * interline
-
- TODO: get allowed-positions as scm list (aarg: from paper block)
-*/
-Real
-Beam::quantise_dy_f (Real dy) const
+/* 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 s = get_elt_property ("slope-quantisation");
-
- if (s == ly_symbol2scm ("none"))
- return dy;
+ Grob *me = unsmob_grob (smob);
- Staff_symbol_referencer_interface st (this);
- Real interline_f = st.staff_space ();
-
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));;
+ if (visible_stem_count (me) <= 1)
+ return SCM_UNSPECIFIED;
- Array<Real> allowed_fraction (3);
- allowed_fraction[0] = 0;
- allowed_fraction[1] = (beam_f / 2 + staffline_f / 2);
- allowed_fraction[2] = (beam_f + staffline_f);
+ SCM s = me->get_grob_property ("damping");
+ int damping = gh_scm2int (s);
- allowed_fraction.push (interline_f);
- Interval iv = quantise_iv (allowed_fraction, abs (dy));
- Real q = (abs (dy) - iv[SMALLER] <= iv[BIGGER] - abs (dy))
- ? iv[SMALLER]
- : iv[BIGGER];
+ if (damping)
+ {
+ 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 q * sign (dy);
+ 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 SCM_UNSPECIFIED;
}
-/*
- Prevent interference from stafflines and beams.
- See Documentation/tex/fonts.doc
+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;
+}
- TODO: get allowed-positions as scm list (aarg: from paper block)
+/*
+ Calculate the Y position of the stem-end, given the Y-left, Y-right
+ in POS, and for stem S.
*/
Real
-Beam::quantise_y_f (Real y, Real dy, int quant_dir)
+Beam::calc_stem_y (Grob *me, Item* s, Interval pos)
{
- /*
- 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
- */
- SCM s = get_elt_property ("slope-quantisation");
- if (s == ly_symbol2scm ("none"))
- return y;
-
- /*
- ----------------------------------------------------------
- ########
- ########
- ########
- --------------########------------------------------------
- ########
-
- hang straddle sit inter hang
- */
-
- Staff_symbol_referencer_interface sinf (this);
- Real space = sinf.staff_space ();
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));;
-
- Real straddle = 0;
- Real sit = beam_f / 2 - staffline_f / 2;
- Real hang = space - beam_f / 2 + staffline_f / 2;
-
- /*
- Put all allowed positions into an array.
- Whether a position is allowed or not depends on
- strictness of quantisation, multiplicity and direction.
-
- For simplicity, we'll assume dir = UP and correct if
- dir = DOWN afterwards.
- */
-
- int multiplicity = get_multiplicity ();
-
-
- Array<Real> allowed_position;
- if (s == ly_symbol2scm ("normal"))
- {
- if ((multiplicity <= 2) || (abs (dy) >= staffline_f / 2))
- allowed_position.push (straddle);
- if ((multiplicity <= 1) || (abs (dy) >= staffline_f / 2))
- allowed_position.push (sit);
- allowed_position.push (hang);
- }
- else if (s == ly_symbol2scm ("traditional"))
+ int beam_multiplicity = get_multiplicity (me);
+ int stem_multiplicity = (Stem::flag_i (s) - 2) >? 0;
+
+ 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 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)
{
- // TODO: check and fix TRADITIONAL
- if ((multiplicity <= 2) || (abs (dy) >= staffline_f / 2))
- allowed_position.push (straddle);
- if ((multiplicity <= 1) && (dy <= staffline_f / 2))
- allowed_position.push (sit);
- if (dy >= -staffline_f / 2)
- allowed_position.push (hang);
+ stem_y -= dir * (thick / 2 + (beam_multiplicity - 1) * interbeam);
+
+ // 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;
}
- allowed_position.push (space);
- Real up_y = get_direction () * y;
- Interval iv = quantise_iv (allowed_position, up_y);
+ return stem_y;
+}
+
+/*
+ Hmm. At this time, beam position and slope are determined. Maybe,
+ stem directions and length should set to relative to the chord's
+ position of the beam. */
+void
+Beam::set_stem_lengths (Grob *me)
+{
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ if (stems.size () <= 1)
+ return;
+
+ Grob *common = me->common_refpoint (stems[0], Y_AXIS);
+ for (int i=1; i < stems.size (); i++)
+ 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 q = up_y - iv[SMALLER] <= iv[BIGGER] - up_y
- ? iv[SMALLER] : iv[BIGGER];
- if (quant_dir)
- q = iv[(Direction)quant_dir];
+ Real stem_y = calc_stem_y (me, s, pos);
- return q * get_direction ();
+ // 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) / staff_space * 2);
+ }
}
void
-Beam::set_beaming (Beaming_info_list *beaming)
+Beam::set_beaming (Grob *me, Beaming_info_list *beaming)
{
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_grobs (me, (Grob *)0, "stems");
+
Direction d = LEFT;
- for (int i=0; i < stem_count (); i++)
+ for (int i=0; i < stems.size (); i++)
{
do
{
- if (stem (i)->beam_count (d) == 0)
- stem (i)->set_beaming ( beaming->infos_.elem (i).beams_i_drul_[d],d);
+ /* Don't overwrite user override (?) */
+ 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))
+ {
+ int b = beaming->infos_.elem (i).beams_i_drul_[d];
+ Stem::set_beaming (stems[i], b, d);
+ }
}
while (flip (&d) != LEFT);
}
/*
beams to go with one stem.
- BURP
- clean me up.
+ FIXME: clean me up.
*/
Molecule
-Beam::stem_beams (Stem *here, Stem *next, Stem *prev) const
+Beam::stem_beams (Grob *me, Item *here, Item *next, Item *prev, Real dydx)
{
- if ((next && !(next->hpos_f () > here->hpos_f ())) ||
- (prev && !(prev->hpos_f () < here->hpos_f ())))
- programming_error ("Beams are not left-to-right");
+ // 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 thick = gh_scm2double (me->get_grob_property ("thickness"));
+ Real bdy = get_interbeam (me);
+
+ Molecule leftbeams;
+ Molecule rightbeams;
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- int multiplicity = get_multiplicity ();
+ Real nw_f;
+ if (!Stem::first_head (here))
+ nw_f = 0;
+ else {
+ int t = Stem::type_i (here);
+ SCM proc = me->get_grob_property ("flag-width-function");
+ SCM result = gh_call1 (proc, gh_int2scm (t));
+ nw_f = gh_scm2double (result);
+ }
- Real interbeam_f = paper_l ()->interbeam_f (multiplicity);
- Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));;
- Real dy = interbeam_f;
- Real stemdx = staffline_f;
+ Direction dir = Directional_element_interface::get (me);
- Real dx = last_visible_stem ()->hpos_f () - first_visible_stem ()->hpos_f ();
- Real dydx = get_real ("height")/dx;
+ /* [Tremolo] beams on whole notes may not have direction set? */
+ if (dir == CENTER)
+ dir = Directional_element_interface::get (here);
- Molecule leftbeams;
- Molecule rightbeams;
-
- // UGH
- Real nw_f;
- if (!here->first_head ())
- nw_f = 0;
- else if (here->type_i ()== 1)
- nw_f = paper_l ()->get_var ("wholewidth");
- else if (here->type_i () == 2)
- nw_f = paper_l ()->get_var ("notewidth") * 0.8;
- else
- nw_f = paper_l ()->get_var ("quartwidth");
/* half beams extending to the left. */
if (prev)
{
- int lhalfs= lhalfs = here->beam_count (LEFT) - prev->beam_count (RIGHT);
- int lwholebeams= here->beam_count (LEFT) <? prev->beam_count (RIGHT) ;
- /*
- Half beam should be one note-width,
- but let's make sure two half-beams never touch
- */
- Real w = here->hpos_f () - prev->hpos_f ();
+ 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 ("stafflinethickness");
+
w = w/2 <? nw_f;
Molecule a;
if (lhalfs) // generates warnings if not
- a = lookup_l ()->beam (dydx, w, beam_f);
+ 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);
- b.translate_axis (-get_direction () * dy * (lwholebeams+j), Y_AXIS);
+ b.translate_axis (-dir * bdy * (lwholebeams+j), Y_AXIS);
leftbeams.add_molecule (b);
}
}
if (next)
{
- int rhalfs = here->beam_count (RIGHT) - next->beam_count (LEFT);
- int rwholebeams= here->beam_count (RIGHT) <? next->beam_count (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 ("stafflinethickness");
- Real w = next->hpos_f () - here->hpos_f ();
- Molecule a = lookup_l ()->beam (dydx, w + stemdx, beam_f);
- 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 = get_elt_property ("beam-gap");
+
+ 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++)
{
Molecule b (a);
- b.translate_axis (-get_direction () * dy * j, Y_AXIS);
+ 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_l ()->beam (dydx, w + stemdx, beam_f);
+ a = Lookup::beam (dydx, w + stem_w, thick);
}
for (; j < rwholebeams; j++)
{
Molecule b (a);
- if (!here->invisible_b ())
- b.translate (Offset (gap_f, -get_direction () * dy * 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
- b.translate (Offset (0, -get_direction () * dy * j));
+ tx = gap_f;
+ b.translate (Offset (tx, -dir * bdy * j));
rightbeams.add_molecule (b);
}
w = w/2 <? nw_f;
if (rhalfs)
- a = lookup_l ()->beam (dydx, w, beam_f);
+ a = Lookup::beam (dydx, w, thick);
for (; j < rwholebeams + rhalfs; j++)
{
Molecule b (a);
- b.translate_axis (-get_direction () * dy * j, Y_AXIS);
+ b.translate_axis (- dir * bdy * j, Y_AXIS);
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;
}
-Molecule*
-Beam::do_brew_molecule_p () const
+MAKE_SCHEME_CALLBACK (Beam, brew_molecule, 1);
+SCM
+Beam::brew_molecule (SCM smob)
{
- Molecule *mol_p = new Molecule;
- if (!stem_count ())
- return mol_p;
-
- Real x0 = first_visible_stem ()->hpos_f ();
- Real dx = last_visible_stem ()->hpos_f () - x0;
- Real dydx = get_real ("height")/dx;
- Real y = get_real ("y-position");
- for (int j=0; j <stem_count (); j++)
+ Grob *me =unsmob_grob (smob);
+
+ Molecule mol;
+ if (!gh_pair_p (me->get_grob_property ("stems")))
+ return SCM_EOL;
+ Real x0, dx;
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ if (visible_stem_count (me))
+ {
+ // 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
{
- Stem *i = stem (j);
- Stem * prev = (j > 0)? stem (j-1) : 0;
- Stem * next = (j < stem_count ()-1) ? stem (j+1) :0;
-
- Molecule sb = stem_beams (i, next, prev);
- Real x = i->hpos_f ()-x0;
- sb.translate (Offset (x, x * dydx + y));
- mol_p->add_molecule (sb);
+ x0 = stems[0]->relative_coordinate (0, X_AXIS);
+ dx = stems.top ()->relative_coordinate (0, X_AXIS) - x0;
}
- mol_p->translate_axis (x0
- - spanned_drul_[LEFT]->relative_coordinate (0, X_AXIS), X_AXIS);
- return mol_p;
+ Interval pos = ly_scm2interval (me->get_grob_property ("positions"));
+ Real dy = pos.delta ();
+ Real dydx = dy && dx ? dy/dx : 0;
+
+ for (int i=0; i < stems.size (); i++)
+ {
+ 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, 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);
+
+ if (0)
+ {
+ /*
+ 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 () const
+Beam::forced_stem_count (Grob *me)
{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
int f = 0;
- for (int i=0; i < stem_count (); i++)
+ for (int i=0; i < stems.size (); i++)
{
- Stem *s = stem (i);
+ Item *s = stems[i];
- if (s->invisible_b ())
+ if (Stem::invisible_b (s))
continue;
- if (((int)s->chord_start_f ())
- && (s->get_direction () != s->get_default_dir ()))
+ if (((int)Stem::chord_start_f (s))
+ && (Stem::get_direction (s) != Stem::get_default_dir (s)))
f++;
}
return f;
-/*
- TODO: Fix this class. This is wildly inefficient.
- And it sux. Yet another array/list 'interface'.
- */
-Stem *
-Beam::stem (int i) const
-{
- return Group_interface__extract_elements ((Beam*) this, (Stem*) 0, "stems")[i];
-}
-
-int
-Beam::stem_count () const
-{
- Group_interface gi (this, "stems");
- return gi.count ();
-}
-
-Stem*
-Beam::stem_top () const
-{
- SCM s = get_elt_property ("stems");
-
- return gh_pair_p (s) ? dynamic_cast<Stem*> (unsmob_element (gh_car (s))) : 0;
-
- //Group_interface__extract_elements ((Beam*) this, (Stem*) 0, "stems")[stem_count () - 1];
-}
-/* burp */
+/* TODO:
+ use filter and standard list functions.
+ */
int
-Beam::visible_stem_count () const
+Beam::visible_stem_count (Grob *me)
{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
int c = 0;
- for (int i = 0; i < stem_count (); i++)
+ for (int i = stems.size (); i--;)
{
- if (!stem (i)->invisible_b ())
+ if (!Stem::invisible_b (stems[i]))
c++;
}
return c;
}
-Stem*
-Beam::first_visible_stem () const
+Item*
+Beam::first_visible_stem (Grob *me)
{
- for (int i = 0; i < stem_count (); i++)
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size (); i++)
{
- Stem* s = stem (i);
- if (!s->invisible_b ())
- return s;
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
}
-
- assert (0);
-
return 0;
}
-Stem*
-Beam::last_visible_stem () const
+Item*
+Beam::last_visible_stem (Grob *me)
{
- for (int i = stem_count (); i > 0; i--)
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ for (int i = stems.size (); i--;)
{
- Stem* s = stem (i - 1);
- if (!s->invisible_b ())
- return s;
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
}
-
- assert (0);
- // sigh
return 0;
}
+
+
+/*
+ [TODO]
+ handle rest under beam (do_post: beams are calculated now)
+ what about combination of collisions and rest under beam.
+
+ Should lookup
+
+ rest -> stem -> beam -> interpolate_y_position ()
+*/
+MAKE_SCHEME_CALLBACK (Beam, rest_collision_callback, 2);
+SCM
+Beam::rest_collision_callback (SCM element_smob, SCM axis)
+{
+ Grob *rest = unsmob_grob (element_smob);
+ Axis a = (Axis) gh_scm2int (axis);
+
+ assert (a == Y_AXIS);
+
+ 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))
+ 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)))
+ pos = ly_scm2interval (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 = dy && dx ? dy/dx : 0;
+
+ 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 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"));
+ Real dist =
+ minimum_dist + -d * (beamy - rest_dim) >? 0;
+
+ int stafflines = Staff_symbol_referencer::line_count (rest);
+
+ // move discretely by half spaces.
+ int discrete_dist = int (ceil (dist));
+
+ // move by whole spaces inside the staff.
+ if (discrete_dist < stafflines+1)
+ discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
+
+ return gh_double2scm (-d * discrete_dist);
+}
+
+
+bool
+Beam::has_interface (Grob *me)
+{
+ return me->has_interface (ly_symbol2scm ("beam-interface"));
+}
+