source file of the GNU LilyPond music typesetter
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
- TODO
+*/
- Less hairy code. knee: ([\stem 1; c8 \stem -1; c8]
-
+/*
+ [TODO]
+ * less hairy code
+ * move paper vars to scm
+
+
+ remove *-hs variables.
+
*/
-#include <math.h>
-#include "p-col.hh"
-#include "varray.hh"
-#include "proto.hh"
-#include "dimen.hh"
+#include <math.h> // tanh.
+#include "directional-element-interface.hh"
+#include "beaming.hh"
+#include "dimensions.hh"
#include "beam.hh"
-#include "abbreviation-beam.hh"
#include "misc.hh"
#include "debug.hh"
-#include "symbol.hh"
-#include "molecule.hh"
-#include "leastsquares.hh"
+#include "least-squares.hh"
#include "stem.hh"
#include "paper-def.hh"
#include "lookup.hh"
-#include "grouping.hh"
-#include "stem-info.hh"
-
-
-IMPLEMENT_IS_TYPE_B1(Beam, Spanner);
+#include "group-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "cross-staff.hh"
-Beam::Beam()
+Beam::Beam ()
{
- slope = 0;
- left_pos = 0.0;
+ Group_interface g (this, "stems");
+ g.set_interface ();
+
+ set_elt_property ("height", gh_int2scm (0)); // ugh.
+ set_elt_property ("y-position" ,gh_int2scm (0));
}
void
-Beam::add (Stem*s)
+Beam::add_stem (Stem*s)
{
- stems.push (s);
+ Group_interface gi (this, "stems");
+ gi.add_element (s);
+
s->add_dependency (this);
- s->beam_l_ = this;
- if (!spanned_drul_[LEFT])
- set_bounds (LEFT,s);
+ assert (!s->beam_l ());
+ s->set_elt_property ("beam", self_scm_);
+
+ if (!get_bound (LEFT))
+ set_bound (LEFT,s);
else
- set_bounds (RIGHT,s);
+ set_bound (RIGHT,s);
}
-Molecule*
-Beam::brew_molecule_p() const
+int
+Beam::get_multiplicity () const
{
- Molecule *mol_p = new Molecule;
- // huh? inter-what
- // Real inter_f = paper()->interbeam_f ();
- Real inter_f = paper()->internote_f ();
- Real x0 = stems[0]->hpos_f();
- for (int j=0; j <stems.size(); j++)
+ int m = 0;
+ for (SCM s = get_elt_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
{
- Stem *i = stems[j];
- Stem * prev = (j > 0)? stems[j-1] : 0;
- Stem * next = (j < stems.size()-1) ? stems[j+1] :0;
+ Score_element * sc = unsmob_element (gh_car (s));
- Molecule sb = stem_beams (i, next, prev);
- Real x = i->hpos_f()-x0;
- sb.translate (Offset (x, (x * slope + left_pos)* inter_f));
- mol_p->add (sb);
+ if (Stem * st = dynamic_cast<Stem*> (sc))
+ m = m >? st->beam_count (LEFT) >? st->beam_count (RIGHT);
}
- mol_p->translate (x0 - spanned_drul_[LEFT]->absolute_coordinate(X_AXIS), X_AXIS);
- return mol_p;
+ return m;
}
-Offset
-Beam::center() const
+/*
+ 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::before_line_breaking ()
{
- Real w=(paper()->note_width () + width ().length ())/2.0;
- return Offset (w, (left_pos + w* slope)*paper()->internote_f ());
+ // Why?
+ if (visible_stem_count () < 2)
+ {
+ warning (_ ("beam has less than two stems"));
+ // set_elt_property ("transparent", SCM_BOOL_T);
+ }
+
+ if (!directional_element (this).get ())
+ directional_element (this).set (get_default_dir ());
+
+ auto_knees ();
+ set_stem_directions ();
+ set_stem_shorten ();
}
-void
-Beam::do_pre_processing()
+/*
+ FIXME
+ */
+Direction
+Beam::get_default_dir () const
{
- if (!dir_)
- set_default_dir();
+ Drul_array<int> total;
+ total[UP] = total[DOWN] = 0;
+ Drul_array<int> count;
+ 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);
+ Direction sd = directional_element (s).get ();
+ int current = sd ? (1 + d * sd)/2
+ : s->get_center_distance ((Direction)-d);
+
+ if (current)
+ {
+ total[d] += current;
+ count[d] ++;
+ }
+
+ } while (flip(&d) != DOWN);
+
+
+ SCM s = scm_eval (gh_list (ly_symbol2scm ("beam-dir-algorithm"),
+ ly_quote_scm (gh_cons (gh_int2scm (count[UP]),
+ gh_int2scm (count[DOWN]))),
+ ly_quote_scm (gh_cons (gh_int2scm (total[UP]),
+ gh_int2scm (total[DOWN]))),
+ SCM_UNDEFINED));
+ if (gh_number_p (s) && gh_scm2int (s))
+ return to_dir (s);
+
+ /*
+ If dir is not determined: get from paper
+ */
+ return (Direction)(int)
+ paper_l ()->get_var ("stem_default_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.
+ */
void
-Beam::do_print() const
+Beam::set_stem_directions ()
{
-#ifndef NPRINT
- DOUT << "slope " <<slope << "left ypos " << left_pos;
- Spanner::do_print();
-#endif
-}
+ Direction d = directional_element (this).get ();
+ for (int i=0; i <stem_count (); i++)
+ {
+ Stem *s = stem (i);
+ SCM force = s->remove_elt_property ("dir-forced");
+ if (!gh_boolean_p (force) || !gh_scm2bool (force))
+ directional_element (s).set (d);
+ }
+}
void
-Beam::do_post_processing()
+Beam::auto_knees ()
{
- if (stems.size() < 2)
+ 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.
+
+ `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)
+{
+ bool knee_b = false;
+ int knee_y = 0;
+ SCM gap = get_elt_property (gap_str);
+ Direction d = directional_element (this).get ();
+
+ if (gh_number_p (gap))
{
- warning ("Beam with less than 2 stems");
- transparent_b_ = true;
- return ;
+ int auto_gap_i = gh_scm2int (gap);
+ for (int i=1; i < stem_count (); 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)->head_positions()[d])
+ + (int)calc_interstaff_dist (stem (i-1), this);
+ int r_y = (int)(stem (i)->head_positions()[d])
+ + (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))
+ {
+ knee_y = (r_y + l_y) / 2;
+ knee_b = true;
+ break;
+ }
+ }
+ }
+ if (knee_b)
+ {
+ for (int i=0; i < stem_count (); i++)
+ {
+ int y = (int)(stem (i)->head_positions()[d])
+ + (int)calc_interstaff_dist (stem (i), this);
+ directional_element (stem (i)).set (y < knee_y ? UP : DOWN);
+ stem (i)->set_elt_property ("dir-forced", SCM_BOOL_T);
+ }
}
- solve_slope();
- set_stemlens();
+ return knee_b;
}
+/*
+ Set stem's shorten property if unset.
+ TODO:
+ take some y-position (chord/beam/nearest?) into account
+ scmify forced-fraction
+ */
void
-Beam::do_substitute_dependent (Score_elem*o,Score_elem*n)
+Beam::set_stem_shorten ()
{
- if (o->is_type_b (Stem::static_name()))
- stems.substitute ((Stem*)o->item(), n?(Stem*) n->item ():0);
-}
+ if (!visible_stem_count ())
+ return;
-Interval
-Beam::do_width() const
-{
- return Interval (stems[0]->hpos_f(),
- stems.top()->hpos_f ());
+ Real forced_fraction = forced_stem_count () / visible_stem_count ();
+ if (forced_fraction < 0.5)
+ return;
+
+ int multiplicity = get_multiplicity ();
+
+ // grace stems?
+ SCM shorten = scm_eval (ly_symbol2scm ("beamed-stem-shorten"));
+
+ if (shorten == SCM_EOL)
+ return;
+
+ int sz = scm_ilength (shorten);
+
+ Staff_symbol_referencer_interface st (this);
+ Real staff_space = st.staff_space ();
+ 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 this -- how to customise ? */
+ if (forced_fraction < 1)
+ shorten_f /= 2;
+
+ 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));
+ }
}
+/*
+ Set elt properties height and y-position if not set.
+ Adjust stem lengths to reach beam.
+ */
void
-Beam::set_default_dir()
+Beam::after_line_breaking ()
{
- int up = 0, down = 0;
- int up_count = 0, down_count = 0;
+ /* first, calculate y, dy */
+ Real y, dy;
+ calc_default_position_and_height (&y, &dy);
+ if (visible_stem_count ())
+ {
+ if (suspect_slope_b (y, dy))
+ dy = 0;
+
+ Real damped_dy = calc_slope_damping_f (dy);
+ Real quantised_dy = quantise_dy_f (damped_dy);
- for (int i=0; i <stems.size(); i++)
+ y += (dy - quantised_dy) / 2;
+ dy = quantised_dy;
+ }
+ /*
+ until here, we used only stem_info, which acts as if dir=up
+ */
+ y *= directional_element (this).get ();
+ dy *= directional_element (this).get ();
+
+ Staff_symbol_referencer_interface st (this);
+ Real half_space = st.staff_space () / 2;
+
+ /* check for user-override of dy */
+ SCM s = remove_elt_property ("height-hs");
+ if (gh_number_p (s))
{
- Stem *sl = stems[i];
- int cur_down = sl->get_center_distance_from_top();
- int cur_up = sl->get_center_distance_from_bottom();
- if (cur_down)
- {
- down += cur_down;
- down_count++;
- }
- if (cur_up)
+ dy = gh_scm2double (s) * half_space;
+ }
+ set_elt_property ("height", gh_double2scm (dy));
+
+ /* check for user-override of y */
+ s = remove_elt_property ("y-position-hs");
+ if (gh_number_p (s))
+ {
+ y = gh_scm2double (s) * half_space;
+ }
+ 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);
+
+ if (y_shift > half_space / 4)
{
- up += cur_up;
- up_count++;
+ 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 (this).get ();
+ y = quantise_y_f (y, dy, quant_dir);
}
}
- if (!down)
- down_count = 1;
- if (!up)
- up_count = 1;
+ // UGH. Y is not in staff position unit?
+ // Ik dacht datwe daar juist van weg wilden?
+ set_stem_length (y, dy);
+ set_elt_property ("y-position", gh_double2scm (y));
+}
- // the following relation is equal to
- // up / up_count > down / down_count
- dir_ = (up * down_count > down * up_count) ? UP : DOWN;
+/*
+ See Documentation/tex/fonts.doc
+ */
+void
+Beam::calc_default_position_and_height (Real* y, Real* dy) const
+{
+ *y = 0;
+ *dy = 0;
+ if (visible_stem_count () <= 1)
+ return;
+
+ Real first_ideal = first_visible_stem ()->calc_stem_info ().idealy_f_;
+ if (first_ideal == last_visible_stem ()->calc_stem_info ().idealy_f_)
+ {
+ *dy = 0;
+ *y = first_ideal;
+ return;
+ }
- for (int i=0; i <stems.size(); i++)
+ Array<Offset> ideals;
+ Real x0 = first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ for (int i=0; i < stem_count (); i++)
{
- Stem *sl = stems[i];
- sl->dir_ = dir_;
+ Stem* s = stem (i);
+ if (s->invisible_b ())
+ continue;
+ ideals.push (Offset (s->relative_coordinate (0, X_AXIS) - x0,
+ s->calc_stem_info ().idealy_f_));
}
+ Real dydx;
+ minimise_least_squares (&dydx, y, ideals); // duh, takes references
+
+ Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
+ *dy = dydx * dx;
}
-/*
- should use minimum energy formulation (cf linespacing)
+bool
+Beam::suspect_slope_b (Real y, Real dy) const
+{
+ /* first, calculate y, dy */
+ /*
+ 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");
- [todo]
- the y of the (start) of the beam should be quantisized,
- so that no stafflines appear just in between two beam-flags
+ Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ Real dydx = dy && dx ? dy/dx : 0;
+ if (((y - first_ideal > lengthened) && (dydx > steep))
+ || ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
+ {
+ return true;
+ }
+ return false;
+}
+
+/*
+ This neat trick is by Werner Lemberg,
+ damped = tanh (slope)
+ corresponds with some tables in [Wanske]
*/
-void
-Beam::solve_slope()
+Real
+Beam::calc_slope_damping_f (Real dy) const
{
- Array<Stem_info> sinfo;
- for (int j=0; j <stems.size(); j++)
- {
- Stem *i = stems[j];
+ SCM damp = get_elt_property ("damping"); // remove?
+ int damping = 1; // ugh.
+ if (gh_number_p (damp))
+ damping = gh_scm2int (damp);
- i->set_default_extents();
- if (i->invisible_b())
- continue;
-
- Stem_info info (i);
- sinfo.push (info);
- }
- if (! sinfo.size())
- slope = left_pos = 0;
- else if (sinfo.size() == 1)
+ if (damping)
{
- slope = 0;
- left_pos = sinfo[0].idealy_f_;
+ Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS)
+ - first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ Real dydx = dy && dx ? dy/dx : 0;
+ dydx = 0.6 * tanh (dydx) / damping;
+ return dydx * dx;
}
- else
- {
-
- Real leftx = sinfo[0].x;
- Least_squares l;
- for (int i=0; i < sinfo.size(); i++)
- {
- sinfo[i].x -= leftx;
- l.input.push (Offset (sinfo[i].x, sinfo[i].idealy_f_));
- }
+ return dy;
+}
- l.minimise (slope, left_pos);
+Real
+Beam::calc_stem_y_f (Stem* s, Real y, Real dy) const
+{
+ Real thick = gh_scm2double (get_elt_property ("beam-thickness"));
+ int beam_multiplicity = get_multiplicity ();
+ int stem_multiplicity = (s->flag_i () - 2) >? 0;
+
+ Real interbeam_f = paper_l ()->interbeam_f (beam_multiplicity);
+ Real x0 = first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
+ Real stem_y = (dy && dx ? (s->relative_coordinate (0, X_AXIS) - x0) / dx * dy : 0) + y;
+
+ /* knee */
+ Direction dir = directional_element(this).get ();
+ Direction sdir = directional_element (s).get ();
+
+ /* knee */
+ if (dir!= sdir)
+ {
+ stem_y -= dir
+ * (thick / 2 + (beam_multiplicity - 1) * interbeam_f);
+
+ Staff_symbol_referencer_interface me (s);
+ Staff_symbol_referencer_interface last (last_visible_stem ());
+
+ // huh, why not for first visible?
+ if (//(s != first_visible_stem ()) &&
+ me.staff_symbol_l () != last.staff_symbol_l ())
+ stem_y += directional_element (this).get ()
+ * (beam_multiplicity - stem_multiplicity) * interbeam_f;
}
+ return stem_y;
+}
+
+Real
+Beam::check_stem_length_f (Real y, Real dy) const
+{
+ Real shorten = 0;
+ Real lengthen = 0;
+ Direction dir = directional_element (this).get ();
- Real dy = 0.0;
- for (int i=0; i < sinfo.size(); i++)
+ for (int i=0; i < stem_count (); i++)
{
- Real y = sinfo[i].x * slope + left_pos;
- Real my = sinfo[i].miny_f_;
+ Stem* s = stem (i);
+ if (s->invisible_b ())
+ continue;
+
+ Real stem_y = calc_stem_y_f (s, y, dy);
+
+ stem_y *= dir;
+ Stem_info info = s->calc_stem_info ();
- if (my - y > dy)
- dy = my -y;
+ // 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;
}
- left_pos += dy;
- left_pos *= dir_;
- slope *= dir_;
+ if (lengthen && shorten)
+ warning (_ ("weird beam vertical offset"));
- /*
- This neat trick is by Werner Lemberg, damped = tanh (slope) corresponds
- with some tables in [Wanske]
- */
- slope = 0.6 * tanh (slope);
-
- // ugh
- Real sl = slope*paper()->internote_f ();
- paper()->lookup_l ()->beam (sl, 20 PT);
- slope = sl /paper()->internote_f ();
+ /* when all stems are too short, normal stems win */
+ return dir * ((shorten) ? shorten : lengthen);
}
+/*
+ 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_stemlens()
+Beam::set_stem_length (Real y, Real dy)
{
- Real x0 = stems[0]->hpos_f();
- for (int j=0; j <stems.size(); j++)
+ Staff_symbol_referencer_interface st (this);
+ Real half_space = st.staff_space ()/2;
+ for (int i=0; i < stem_count (); i++)
{
- Stem *s = stems[j];
+ Stem* s = stem (i);
+ if (s->invisible_b ())
+ continue;
+
+ Real stem_y = calc_stem_y_f (s, y, dy);
- Real x = s->hpos_f()-x0;
- s->set_stemend (left_pos + slope * x);
+ /* caution: stem measures in staff-positions */
+ s->set_stemend ((stem_y + calc_interstaff_dist (s, this)) / half_space);
}
}
-void
-Beam::set_grouping (Rhythmic_grouping def, Rhythmic_grouping cur)
+/*
+ [Ross] (simplification of)
+ Set dy complying with:
+ - zero
+ - thick / 2 + staffline_f / 2
+ - thick + staffline_f
+ + n * staff_space
+*/
+Real
+Beam::quantise_dy_f (Real dy) const
{
- def.OK();
- cur.OK();
- assert (cur.children.size() == stems.size ());
+ Array<Real> a;
+ for (SCM s = scm_eval (ly_symbol2scm ("beam-height-quants")); s !=SCM_EOL; s = gh_cdr (s))
+ a.push (gh_scm2double (gh_car (s)));
- cur.split (def);
+ if (a.size () <= 1)
+ return dy;
- Array<int> b;
- {
- Array<int> flags;
- for (int j=0; j <stems.size(); j++)
- {
- Stem *s = stems[j];
-
- int f = s->flag_i_ - 2;
- assert (f>0);
- flags.push (f);
- }
- int fi =0;
- b= cur.generate_beams (flags, fi);
- b.insert (0,0);
- b.push (0);
- assert (stems.size() == b.size ()/2);
- }
-
- for (int j=0, i=0; i < b.size() && j <stems.size (); i+= 2, j++)
+ Staff_symbol_referencer_interface st (this);
+ Real staff_space = st.staff_space ();
+
+ 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 (Real y, Real dy, int quant_dir)
+{
+ int multiplicity = get_multiplicity ();
+ Staff_symbol_referencer_interface st (this);
+ Real staff_space = st.staff_space ();
+ SCM quants = scm_eval (gh_list (ly_symbol2scm ("beam-vertical-position-quants"),
+ gh_int2scm (multiplicity),
+ gh_double2scm (dy/staff_space),
+ SCM_UNDEFINED));
+
+ Array<Real> a;
+
+ for (; quants != SCM_EOL; quants = gh_cdr (quants))
+ a.push (gh_scm2double (gh_car (quants)));
+
+ if (a.size () <= 1)
+ return y;
+
+ Real up_y = directional_element (this).get () * 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 (this).get ();
+}
+
+void
+Beam::set_beaming (Beaming_info_list *beaming)
+{
+ Direction d = LEFT;
+ for (int i=0; i < stem_count (); i++)
{
- Stem *s = stems[j];
- s->beams_left_i_ = b[i];
- s->beams_right_i_ = b[i+1];
+ do
+ {
+ if (stem (i)->beam_count (d) == 0)
+ stem (i)->set_beaming ( beaming->infos_.elem (i).beams_i_drul_[d],d);
+ }
+ while (flip (&d) != LEFT);
}
}
+
+
/*
beams to go with one stem.
+
+ BURP
+ clean me up.
*/
Molecule
Beam::stem_beams (Stem *here, Stem *next, Stem *prev) const
{
- assert (!next || next->hpos_f() > here->hpos_f ());
- assert (!prev || prev->hpos_f() < here->hpos_f ());
- // Real dy=paper()->internote_f ()*2;
- Real dy = paper()->interbeam_f ();
- Real stemdx = paper()->rule_thickness ();
- Real sl = slope*paper()->internote_f ();
- paper()->lookup_l ()->beam (sl, 20 PT);
+ 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 = paper_l ()->get_var ("stafflinethickness");
+ int multiplicity = get_multiplicity ();
+
+
+ Real interbeam_f = paper_l ()->interbeam_f (multiplicity);
+ Real thick = gh_scm2double (get_elt_property ("beam-thickness"));
+
+ Real bdy = interbeam_f;
+ Real stemdx = staffline_f;
+
+ Real dx = visible_stem_count () ?
+ last_visible_stem ()->relative_coordinate (0, X_AXIS) - first_visible_stem ()->relative_coordinate (0, X_AXIS)
+ : 0.0;
+ Real dy = gh_scm2double (get_elt_property ("height"));
+ Real dydx = dy && dx ? dy/dx : 0;
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");
+
+
+ Direction dir = directional_element (this).get ();
+
/* half beams extending to the left. */
- if (prev)
+ if (prev)
{
- int lhalfs= lhalfs = here->beams_left_i_ - prev->beams_right_i_ ;
- int lwholebeams= here->beams_left_i_ <? prev->beams_right_i_ ;
- Real w = (here->hpos_f () - prev->hpos_f ())/4;
- Symbol dummy;
- Atom a (dummy);
+ 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->relative_coordinate (0, X_AXIS) - prev->relative_coordinate (0, X_AXIS);
+ w = w/2 <? nw_f;
+ Molecule a;
if (lhalfs) // generates warnings if not
- a = paper()->lookup_l ()->beam (sl, w);
- a.translate (Offset (-w, -w * sl));
- for (int j = 0; j < lhalfs; j++)
+ a = lookup_l ()->beam (dydx, w, thick);
+ a.translate (Offset (-w, -w * dydx));
+ for (int j = 0; j < lhalfs; j++)
{
- Atom b (a);
- b.translate (-dir_ * dy * (lwholebeams+j), Y_AXIS);
- leftbeams.add (b);
+ Molecule b (a);
+ b.translate_axis (-dir * bdy * (lwholebeams+j), Y_AXIS);
+ leftbeams.add_molecule (b);
}
}
-
+
if (next)
{
- int rhalfs = here->beams_right_i_ - next->beams_left_i_;
- int rwholebeams = here->beams_right_i_ <? next->beams_left_i_;
-
- Real w = next->hpos_f() - here->hpos_f ();
- Atom a = paper()->lookup_l ()->beam (sl, w + stemdx);
+ int rhalfs = here->beam_count (RIGHT) - next->beam_count (LEFT);
+ int rwholebeams= here->beam_count (RIGHT) <? next->beam_count (LEFT) ;
+ Real w = next->relative_coordinate (0, X_AXIS) - here->relative_coordinate (0, X_AXIS);
+ Molecule a = lookup_l ()->beam (dydx, w + stemdx, thick);
+ a.translate_axis( - stemdx/2, X_AXIS);
int j = 0;
Real gap_f = 0;
- if (here->beam_gap_i_)
+
+ SCM gap = get_elt_property ("beam-gap");
+ if (gh_number_p (gap))
{
- int nogap = rwholebeams - here->beam_gap_i_;
- for (; j < nogap; j++)
+ int gap_i = gh_scm2int ( (gap));
+ int nogap = rwholebeams - gap_i;
+
+ for (; j < nogap; j++)
{
- Atom b (a);
- b.translate (-dir_ * dy * j, Y_AXIS);
- rightbeams.add (b);
+ Molecule b (a);
+ b.translate_axis (-dir * bdy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
}
// TODO: notehead widths differ for different types
- gap_f = paper()->note_width () / 2;
+ gap_f = nw_f / 2;
w -= 2 * gap_f;
- a = paper()->lookup_l ()->beam (sl, w + stemdx);
+ a = lookup_l ()->beam (dydx, w + stemdx, thick);
}
- for (; j < rwholebeams; j++)
+ for (; j < rwholebeams; j++)
{
- Atom b (a);
- b.translate (Offset (gap_f, -dir_ * dy * j));
- rightbeams.add (b);
+ Molecule b (a);
+ b.translate (Offset (here->invisible_b () ? 0 : gap_f, -dir * bdy * j));
+ rightbeams.add_molecule (b);
}
- w /= 4;
+ w = w/2 <? nw_f;
if (rhalfs)
- a = paper()->lookup_l ()->beam (sl, w);
-
- for (; j < rwholebeams + rhalfs; j++)
+ a = lookup_l ()->beam (dydx, w, thick);
+
+ for (; j < rwholebeams + rhalfs; j++)
{
- Atom b (a);
- b.translate (-dir_ * dy * j, Y_AXIS);
- rightbeams.add (b);
+ Molecule b (a);
+ b.translate_axis (- dir * bdy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
}
-
+
}
- leftbeams.add (rightbeams);
+ leftbeams.add_molecule (rightbeams);
+
+ /*
+ Does beam quanting think of the asymetry of beams?
+ Refpoint is on bottom of symbol. (FIXTHAT) --hwn.
+ */
return leftbeams;
}
+
+
+Molecule
+Beam::do_brew_molecule () const
+{
+ Molecule mol;
+ if (!stem_count ())
+ return mol;
+ Real x0,dx;
+ if (visible_stem_count ())
+ {
+ x0 = first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
+ }
+ else
+ {
+ x0 = stem (0)->relative_coordinate (0, X_AXIS);
+ dx = stem_top ()->relative_coordinate (0, X_AXIS) - x0;
+ }
+
+
+ Real dy = gh_scm2double (get_elt_property ("height"));
+ Real dydx = dy && dx ? dy/dx : 0;
+ Real y = gh_scm2double (get_elt_property ("y-position"));
+ for (int j=0; j <stem_count (); j++)
+ {
+ 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->relative_coordinate (0, X_AXIS)-x0;
+ sb.translate (Offset (x, x * dydx + y));
+ mol.add_molecule (sb);
+ }
+ mol.translate_axis (x0
+ - get_bound (LEFT)->relative_coordinate (0, X_AXIS), X_AXIS);
+
+ return mol;
+}
+
+int
+Beam::forced_stem_count () const
+{
+ int f = 0;
+ for (int i=0; i < stem_count (); i++)
+ {
+ Stem *s = stem (i);
+
+ if (s->invisible_b ())
+ continue;
+
+ if (((int)s->chord_start_f ())
+ && (s->get_direction () != s->get_default_dir ()))
+ 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;
+}
+
+/* burp */
+int
+Beam::visible_stem_count () const
+{
+ int c = 0;
+ for (int i = 0; i < stem_count (); i++)
+ {
+ if (!stem (i)->invisible_b ())
+ c++;
+ }
+ return c;
+}
+
+Stem*
+Beam::first_visible_stem () const
+{
+ for (int i = 0; i < stem_count (); i++)
+ {
+ Stem* s = stem (i);
+ if (!s->invisible_b ())
+ return s;
+ }
+ return 0;
+}
+
+Stem*
+Beam::last_visible_stem () const
+{
+ for (int i = stem_count (); i > 0; i--)
+ {
+ Stem* s = stem (i - 1);
+ if (!s->invisible_b ())
+ return s;
+ }
+ return 0;
+}
projects / lilypond.git / blobdiff