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]
+ * shorter! (now +- 1000 lines)
+ * less hairy code
+ * move paper vars to scm
+
+ remove *-hs variables, and do all y-position stuff in staff-space.
*/
-#include <math.h>
-#include "p-col.hh"
-#include "varray.hh"
-#include "proto.hh"
-#include "dimen.hh"
+#include <math.h> // tanh.
+
+#include "molecule.hh"
+#include "directional-element-interface.hh"
+#include "beaming.hh"
#include "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 "group-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "cross-staff.hh"
+#include "item.hh"
+#include "spanner.hh"
+#include "warn.hh"
+void
+Beam::add_stem (Grob*me, Grob*s)
+{
+ Pointer_group_interface:: add_element(me, "stems", s);
+
+ s->add_dependency (me);
-struct Stem_info {
- Real x;
- int dir_i_;
- Real idealy_f_;
- Real miny_f_;
- int beams_i_;
+ assert (!Stem::beam_l (s));
+ s->set_grob_property ("beam", me->self_scm ());
- Stem_info(){}
- Stem_info(Stem const *);
-};
+ add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
+}
-Stem_info::Stem_info(Stem const *s)
+int
+Beam::get_multiplicity (Grob*me)
{
- x = s->hpos_f();
- dir_i_ = s->dir_i_;
- beams_i_ = intlog2( s->flag_i_ ) - 2;
-
- /*
- [todo]
- * get algorithm
- * runtime
-
- Breitkopf + H\"artel:
- miny_f_ = interline + #beams * interbeam
- ideal8 = 2 * interline + interbeam
- ideal16,32,64,128 = 1.5 * interline + #beams * interbeam
-
- * B\"arenreiter:
- miny_f_ = interline + #beams * interbeam
- ideal8,16 = 2 interline + #beams * interbeam
- ideal32,64,128 = 1.5 interline + #beams * interbeam
-
- */
-
- Real notehead_y = s->paper()->interline_f();
- // huh? why do i need the / 2
-// Real interbeam_f = s->paper()->interbeam_f();
- Real interbeam_f = s->paper()->interbeam_f() / 2;
-
- /* well eh, huh?
- idealy_f_ = dir_i_ * s->stem_start_f() + beams_i_ * interbeam_f;
- if ( beams_i_ < 3 )
- idealy_f_ += 2 * interline_f;
- else
- idealy_f_ += 1.5 * interline_f;
- */
-
- idealy_f_ = dir_i_ * s->stem_end_f();
-
- miny_f_ = dir_i_ * s->stem_start_f() + notehead_y + beams_i_ * interbeam_f;
-
- idealy_f_ = miny_f_ >? idealy_f_;
-// assert(miny_f_ <= idealy_f_);
+ int m = 0;
+ for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
+ {
+ Grob * sc = unsmob_element (gh_car (s));
+
+ 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'.]
+ */
+MAKE_SCHEME_CALLBACK(Beam,before_line_breaking,1);
+SCM
+Beam::before_line_breaking (SCM smob)
+{
+ Grob * me = unsmob_element (smob);
+
+ // Why?
+ if (visible_stem_count (me) < 2)
+ {
+ warning (_ ("beam has less than two stems"));
+ }
-/* *************** */
+ if (!Directional_element_interface::get (me))
+ Directional_element_interface::set (me, get_default_dir (me));
+ auto_knees (me);
+ set_stem_directions (me);
+ set_stem_shorten (me);
-Offset
-Beam::center()const
+ return SCM_EOL;
+}
+
+Direction
+Beam::get_default_dir (Grob*me)
{
- Real w=(paper()->note_width() + width().length())/2.0;
- return Offset(w, (left_pos + w* slope)*paper()->internote_f());
+ Drul_array<int> total;
+ total[UP] = total[DOWN] = 0;
+ Drul_array<int> count;
+ count[UP] = count[DOWN] = 0;
+ Direction d = DOWN;
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ for (int i=0; i <stems.size (); i++)
+ do { // HUH -- waar slaat dit op?
+ 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);
+
+ 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 dir is not determined: get default
+ */
+ return to_dir (me->get_grob_property ("default-neutral-direction"));
}
-Beam::Beam()
+/*
+ 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)
{
- slope = 0;
- left_pos = 0.0;
-}
+ Link_array<Item> stems
+ =Pointer_group_interface__extract_elements (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);
+ }
+}
void
-Beam::add(Stem*s)
+Beam::auto_knees (Grob*me)
{
- stems.push(s);
- s->add_dependency(this);
- s->print_flag_b_ = false;
+ if (!auto_knee (me,"auto-interstaff-knee-gap", true))
+ auto_knee (me, "auto-knee-gap", false);
}
-void
-Beam::set_default_dir()
+/*
+ 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 (Grob*me, String gap_str, bool interstaff_b)
{
- int up = 0, down = 0;
- int up_count = 0, down_count = 0;
-
- for (int i=0; i <stems.size(); i++) {
- 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++;
+ bool knee_b = false;
+ int knee_y = 0;
+ SCM gap = me->get_grob_property (gap_str.ch_C());
+
+ Direction d = Directional_element_interface::get (me);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ if (gh_number_p (gap))
+ {
+ Spanner*sp = dynamic_cast<Spanner*> (me);
+ int auto_gap_i = gh_scm2int (gap);
+ for (int i=1; i < stems.size (); i++)
+ {
+ bool is_b = (bool)(calc_interstaff_dist (stems[i], sp)
+ - calc_interstaff_dist (stems[i-1], sp));
+ int l_y = (int)(Stem::head_positions(stems[i-1])[d])
+ + (int)calc_interstaff_dist (stems[i-1], sp);
+ int r_y = (int)(Stem::head_positions(stems[i])[d])
+ + (int)calc_interstaff_dist (stems[i], sp);
+ 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 (cur_up) {
- up += cur_up;
- up_count++;
+ }
+ if (knee_b)
+ {
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item *s = stems[i];
+ int y = (int)(Stem::head_positions(s)[d])
+ + (int)calc_interstaff_dist (s, dynamic_cast<Spanner*> (me));
+
+ Directional_element_interface::set (s,y < knee_y ? UP : DOWN);
+ s->set_grob_property ("dir-forced", SCM_BOOL_T);
}
}
- if (!down)
- down_count = 1;
- if (!up)
- up_count = 1;
-
- // the following relation is equal to
- // up / up_count > down / down_count
- dir_i_ = (up * down_count > down * up_count) ? 1 : -1;
-
- for (int i=0; i <stems.size(); i++) {
- Stem *sl = stems[i];
- sl->dir_i_ = dir_i_;
- }
+ return knee_b;
}
/*
- should use minimum energy formulation (cf linespacing)
+ 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 (Grob*m)
+{
+ Spanner*me = dynamic_cast<Spanner*> (m);
+ if (!visible_stem_count (me))
+ return;
- [todo]
- the y of the (start) of the beam should be quantisized,
- so that no stafflines appear just in between two beam-flags
+ Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
+ if (forced_fraction < 0.5)
+ return;
-*/
-void
-Beam::solve_slope()
+ int multiplicity = get_multiplicity (me);
+
+ SCM shorten = me->get_grob_property ("beamed-stem-shorten");
+ if (shorten == SCM_EOL)
+ return;
+
+ int sz = scm_ilength (shorten);
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ SCM shorten_elt = scm_list_ref (shorten, gh_int2scm (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;
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ 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));
+ }
+}
+
+/*
+ Set elt properties height and y-position if not set.
+ Adjust stem lengths to reach beam.
+ */
+MAKE_SCHEME_CALLBACK(Beam,after_line_breaking,1);
+SCM
+Beam::after_line_breaking (SCM smob)
{
- Array<Stem_info> sinfo;
- for (int j=0; j <stems.size(); j++) {
- Stem *i = stems[j];
+ Grob * me = unsmob_element (smob);
- i->set_default_extents();
- if (i->invisible_b())
- continue;
-
- Stem_info info(i);
- sinfo.push(info);
+ /* 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;
+
+ Real damped_dy = calc_slope_damping_f (me, dy);
+ Real quantised_dy = quantise_dy_f (me, damped_dy);
+
+ y += (dy - quantised_dy) / 2;
+ dy = quantised_dy;
}
- if (! sinfo.size() )
- slope = left_pos = 0;
- else if (sinfo.size() == 1) {
- slope = 0;
- left_pos = sinfo[0].idealy_f_;
- } 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_));
+ /*
+ 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);
+
+
+ Real half_space = Staff_symbol_referencer::staff_space (me) / 2;
+
+ /* weird: why do we do calc_position_and_height () ? regardless of
+ this setting?
+
+ */
+ /* check for user-override of dy */
+ SCM s = me->remove_grob_property ("height-hs");
+ if (gh_number_p (s))
+ {
+ dy = gh_scm2double (s) * half_space;
+ }
+ 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))
+ {
+ 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)
+ {
+ 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);
}
+ }
+ // 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));
- l.minimise(slope, left_pos);
+ return SCM_UNSPECIFIED;
+}
+
+/*
+ See Documentation/tex/fonts.doc
+ */
+void
+Beam::calc_default_position_and_height (Grob*me,Real* y, Real* dy)
+{
+ *y = 0;
+ *dy = 0;
+ if (visible_stem_count (me) <= 1)
+ return;
+
+ 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_)
+ {
+ *dy = 0;
+ *y = first_ideal;
+ return;
}
-
- Real dy = 0.0;
- for (int i=0; i < sinfo.size(); i++) {
- Real y = sinfo[i].x * slope + left_pos;
- Real my = sinfo[i].miny_f_;
- if (my - y > dy)
- dy = my -y;
+ 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_elements (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).idealy_f_));
}
- left_pos += dy;
- left_pos *= dir_i_;
+ Real dydx;
+ minimise_least_squares (&dydx, y, ideals); // duh, takes references
+
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ *dy = dydx * dx;
+}
- slope *= dir_i_;
+bool
+Beam::suspect_slope_b (Grob*me, Real y, Real dy)
+{
+ /* 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"));
- /*
- This neat trick is by Werner Lemberg, damped = tanh(slope) corresponds
- with some tables in [Wanske]
- */
- slope = 0.6 * tanh(slope);
+ // 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;
- // ugh
- Real sl = slope*paper()->internote_f();
- paper()->lookup_l()->beam(sl, 20 PT);
- slope = sl /paper()->internote_f();
+ if (((y - first_ideal > lengthened) && (dydx > steep))
+ || ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
+ {
+ return true;
+ }
+ return false;
}
-void
-Beam::set_stemlens()
+/*
+ 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)
{
- Real x0 = stems[0]->hpos_f();
- for (int j=0; j <stems.size(); j++) {
- Stem *s = stems[j];
+ SCM damp = me->get_grob_property ("damping");
+ int damping = gh_scm2int (damp);
- Real x = s->hpos_f()-x0;
- s->set_stemend(left_pos + slope * x);
+ if (damping)
+ {
+ // 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;
}
+ return dy;
}
+Real
+Beam::calc_stem_y_f (Grob*me,Item* s, Real y, Real dy)
+{
+ 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) ;
+
+ // 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;
+
+ /* 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;
+}
-void
-Beam::do_post_processing()
+Real
+Beam::check_stem_length_f (Grob*me,Real y, Real dy)
{
- if ( stems.size() < 2) {
- warning("Beam with less than 2 stems");
- transparent_b_ = true;
- return ;
+ 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++)
+ {
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+
+ Real stem_y = calc_stem_y_f (me, s, y, dy);
+
+ stem_y *= dir;
+ Stem_info info = Stem::calc_stem_info (s);
+
+ // 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;
}
- solve_slope();
- set_stemlens();
+
+ if (lengthen && shorten)
+ warning (_ ("weird beam vertical offset"));
+
+ /* 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_grouping(Rhythmic_grouping def, Rhythmic_grouping cur)
+Beam::set_stem_length (Grob*me,Real y, Real dy)
{
- def.OK();
- cur.OK();
- assert(cur.children.size() == stems.size());
-
- cur.split(def);
+ Real half_space = Staff_symbol_referencer::staff_space (me)/2;
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
- Array<int> b;
+
+ for (int i=0; i < stems.size (); i++)
{
- Array<int> flags;
- for (int j=0; j <stems.size(); j++) {
- Stem *s = stems[j];
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
- int f = intlog2(abs(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);
- }
+ Real stem_y = calc_stem_y_f (me, s, y, dy);
- for (int j=0, i=0; i < b.size() && j <stems.size(); i+= 2, j++) {
- Stem *s = stems[j];
- s->beams_left_i_ = b[i];
- s->beams_right_i_ = b[i+1];
+ /* caution: stem measures in staff-positions */
+ Stem::set_stemend (s,(stem_y + calc_interstaff_dist (s, dynamic_cast<Spanner*> (me))) / half_space);
}
}
-void
-Beam::do_pre_processing()
+/*
+ [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)
{
- if (!dir_i_)
- set_default_dir();
+ 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;
-Interval
-Beam::do_width() const
+ 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)
{
- return Interval( stems[0]->hpos_f(),
- stems.top()->hpos_f() );
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_elements (me, (Grob*)0, "stems");
+
+ Direction d = LEFT;
+ for (int i=0; i < stems.size(); i++)
+ {
+ do
+ {
+ if (Stem::beam_count (stems[i], d) == 0)
+ Stem::set_beaming ( stems[i], beaming->infos_.elem (i).beams_i_drul_[d],d);
+ }
+ while (flip (&d) != LEFT);
+ }
}
+
+
/*
beams to go with one stem.
+
+ 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)
{
- 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);
-
- Molecule leftbeams;
- Molecule rightbeams;
-
- /* half beams extending to the left. */
- 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);
- 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++) {
- Atom b(a);
- b.translate( -dir_i_ * dy * (lwholebeams+j), Y_AXIS);
- leftbeams.add( b );
+ // 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;
+
+ Molecule leftbeams;
+ Molecule rightbeams;
+
+ 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);
+ }
+
+
+ Direction dir = Directional_element_interface::get (me);
+
+ /* 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);
+ w = w/2 <? nw_f;
+ Molecule a;
+ if (lhalfs) // generates warnings if not
+ a = Lookup::beam (dydx, w, thick);
+ a.translate (Offset (-w, -w * dydx));
+ for (int j = 0; j < lhalfs; j++)
+ {
+ 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 j = 0;
- for (; j < rwholebeams; j++) {
- Atom b(a);
- b.translate( -dir_i_ * dy * j, Y_AXIS);
- rightbeams.add( b );
+ 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) ;
+
+ 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);
+ 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 nogap = rwholebeams - gap_i;
+
+ for (; j < nogap; j++)
+ {
+ Molecule b (a);
+ b.translate_axis (-dir * bdy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
+ }
+ // TODO: notehead widths differ for different types
+ gap_f = nw_f / 2;
+ w -= 2 * gap_f;
+ a = Lookup::beam (dydx, w + stemdx, thick);
}
- w /= 4;
- if (rhalfs)
- a = paper()->lookup_l()->beam(sl, w);
-
- for (; j < rwholebeams + rhalfs; j++) {
- Atom b(a);
- b.translate( -dir_i_ * dy * j, Y_AXIS);
- rightbeams.add(b );
+ for (; j < rwholebeams; j++)
+ {
+ Molecule b (a);
+ b.translate (Offset (Stem::invisible_b (here) ? 0 : gap_f, -dir * bdy * j));
+ rightbeams.add_molecule (b);
}
-
+
+ w = w/2 <? nw_f;
+ if (rhalfs)
+ a = Lookup::beam (dydx, w, thick);
+
+ for (; j < rwholebeams + rhalfs; j++)
+ {
+ Molecule b (a);
+ 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.
+ */
+ return leftbeams;
+}
+
+MAKE_SCHEME_CALLBACK(Beam,brew_molecule,1);
+SCM
+Beam::brew_molecule (SCM smob)
+{
+ Grob * me =unsmob_element (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_elements (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
+ {
+ x0 = stems[0]->relative_coordinate (0, X_AXIS);
+ 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"));
+
+
+ for (int j=0; j <stems.size (); j++)
+ {
+ Item *i = stems[j];
+ Item * prev = (j > 0)? stems[j-1] : 0;
+ Item * next = (j < stems.size()-1) ? stems[j+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));
+ mol.add_molecule (sb);
}
- leftbeams.add(rightbeams);
- return leftbeams;
+ mol.translate_axis (x0
+ - dynamic_cast<Spanner*> (me)->get_bound (LEFT)->relative_coordinate (0, X_AXIS), X_AXIS);
+
+ return mol.smobbed_copy ();
}
+int
+Beam::forced_stem_count (Grob*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements ( me, (Item*) 0, "stems");
+ int f = 0;
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item *s = stems[i];
+
+ if (Stem::invisible_b (s))
+ continue;
+
+ if (((int)Stem::chord_start_f (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)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ int c = 0;
+ for (int i = stems.size (); i--;)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ c++;
+ }
+ return c;
+}
+
+Item*
+Beam::first_visible_stem(Grob*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements ( me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size (); i++)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
+ }
+ return 0;
+}
-Molecule*
-Beam::brew_molecule_p() const
+Item*
+Beam::last_visible_stem(Grob*me)
{
-
- 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++) {
- Stem *i = stems[j];
- Stem * prev = (j > 0)? stems[j-1] : 0;
- Stem * next = (j < stems.size()-1) ? stems[j+1] :0;
-
- 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);
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements ( me, (Item*) 0, "stems");
+ for (int i = stems.size (); i--;)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
}
- mol_p->translate(x0 - left_col_l_->hpos_f_, X_AXIS);
- return mol_p;
+ return 0;
}
-IMPLEMENT_IS_TYPE_B1(Beam, Spanner);
+/*
+ [TODO]
+ handle rest under beam (do_post: beams are calculated now)
+ what about combination of collisions and rest under beam.
-void
-Beam::do_print()const
+ 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)
{
-#ifndef NPRINT
- mtor << "slope " <<slope << "left ypos " << left_pos;
- Spanner::do_print();
-#endif
+ Grob *rest = unsmob_element (element_smob);
+ Axis a = (Axis) gh_scm2int (axis);
+
+ assert (a == Y_AXIS);
+
+ Grob * st = unsmob_element (rest->get_grob_property ("stem"));
+ Grob * stem = st;
+ if (!stem)
+ return gh_double2scm (0.0);
+ Grob * beam = unsmob_element (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.
+ 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);
+
+ // 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;
+
+ Direction d = Stem::get_direction (stem);
+ Real beamy = (stem->relative_coordinate (0, X_AXIS) - x0) * dydx + beam_y;
+
+ 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"));
}
void
-Beam::do_substitute_dependent(Score_elem*o,Score_elem*n)
+Beam::set_interface (Grob*me)
{
- if (o->is_type_b( Stem::static_name() )) {
- stems.substitute( (Stem*)o->item(), n?(Stem*) n->item():0);
- }
+ /*
+ 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"));
}
projects / lilypond.git / blobdiff