--- /dev/null
+/*
+ beam.cc -- implement Beam
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
+
+*/
+
+/*
+ [TODO]
+
+ -* shorter! (now +- 1000 lines)
+
+ -* less hairy code
+
+ -* Remove #'direction from beam. The beam has no direction per se.
+ It may only set directions for stems.
+ */
+
+
+#include <math.h> // tanh.
+
+#include "molecule.hh"
+#include "directional-element-interface.hh"
+#include "beaming.hh"
+#include "beam.hh"
+#include "misc.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 "item.hh"
+#include "spanner.hh"
+#include "warn.hh"
+
+void
+Beam::add_stem (Grob*me, Grob*s)
+{
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("stems"), s);
+
+ s->add_dependency (me);
+
+ assert (!Stem::beam_l (s));
+ s->set_grob_property ("beam", me->self_scm ());
+
+ add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
+}
+
+int
+Beam::get_multiplicity (Grob*me)
+{
+ int m = 0;
+ for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
+ {
+ Grob * sc = unsmob_grob (ly_car (s));
+
+ 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_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.*/
+
+
+ if (visible_stem_count (me) < 2)
+ {
+ me->warning (_ ("beam has less than two visible stems"));
+
+ SCM stems = me->get_grob_property ("stems");
+ if (scm_ilength (stems) == 1)
+ {
+ me->warning (_("Beam has less than two stems. Removing beam."));
+
+ unsmob_grob (gh_car (stems))->remove_grob_property ("beam");
+ me->suicide ();
+
+ return SCM_UNSPECIFIED;
+ }
+ else if (scm_ilength (stems) == 0)
+ {
+ me->suicide ();
+ return SCM_UNSPECIFIED;
+ }
+ }
+ if (visible_stem_count (me) >= 1)
+ {
+ if (!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;
+}
+
+Direction
+Beam::get_default_dir (Grob*me)
+{
+ 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_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);
+
+ 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 ("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::set_stem_directions (Grob*me)
+{
+ 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++)
+ {
+ 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);
+ }
+}
+
+/*
+ Simplistic auto-knees; only consider vertical gap between two
+ adjacent chords.
+
+ `Forced' stem directions are ignored. If you don't want auto-knees,
+ don't set, or unset auto-knee-gap.
+ */
+void
+Beam::consider_auto_knees (Grob *me)
+{
+ SCM scm = me->get_grob_property ("auto-knee-gap");
+
+ if (gh_number_p (scm))
+ {
+ 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++)
+ {
+ 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 = (right + left) / 2;
+ knee_b = true;
+ break;
+ }
+ }
+
+ 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);
+ }
+ }
+ }
+}
+
+/*
+ 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);
+
+ Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
+ if (forced_fraction < 0.5)
+ return;
+
+ 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_grobs (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));
+ }
+}
+
+/*
+ Call list of y-dy-callbacks, that handle setting of
+ grob-properties y, dy.
+
+ User may set grob-properties: y-position-hs and height-hs
+ (to be fixed) that override the calculated y and dy.
+
+ Because y and dy cannot be calculated and quanted separately, we
+ always calculate both, then check for user override.
+ */
+MAKE_SCHEME_CALLBACK (Beam, after_line_breaking, 1);
+SCM
+Beam::after_line_breaking (SCM smob)
+{
+ Grob * me = unsmob_grob (smob);
+
+ me->set_grob_property ("y", gh_double2scm (0));
+ me->set_grob_property ("dy", gh_double2scm (0));
+
+ /* Hmm, callbacks should be called by, a eh, callback mechanism
+ somewhere (?), I guess, not by looping here. */
+
+ SCM list = me->get_grob_property ("y-dy-callbacks");
+ for (SCM i = list; gh_pair_p (i); i = ly_cdr (i))
+ gh_call1 (ly_car (i), smob);
+
+ // UGH. Y is not in staff position unit?
+ // Ik dacht datwe daar juist van weg wilden?
+
+ // Hmm, nu hebben we 3 dimensies, want inmiddels zijn we daar
+ // weer terug, maar dan / 2
+ // (staff-space iso staff-position)
+
+ set_stem_lengths (me);
+
+ return SCM_UNSPECIFIED;
+}
+
+
+MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
+SCM
+Beam::least_squares (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ if (visible_stem_count (me) <= 1)
+ return SCM_UNSPECIFIED;
+
+ Real y = 0;
+ Real dy = 0;
+
+ /* Stem_info, and thus y,dy in this function are corrected for beam-dir */
+ 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_)
+ {
+ y = first_ideal;
+ dy = 0;
+ }
+ else
+ {
+ Array<Offset> ideals;
+
+ // ugh -> use commonx
+ Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+
+ for (int i=0; i < stems.size (); i++)
+ {
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
+ continue;
+ ideals.push (Offset (s->relative_coordinate (0, X_AXIS) - x0,
+ Stem::calc_stem_info (s).idealy_f_));
+ }
+ Real dydx;
+ minimise_least_squares (&dydx, &y, ideals);
+
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ dy = dydx * dx;
+ }
+
+ /* Store true, not dir-corrected values */
+ Direction dir = Directional_element_interface::get (me);
+ me->set_grob_property ("y", gh_double2scm (y * dir));
+ me->set_grob_property ("dy", gh_double2scm (dy * dir));
+ return SCM_UNSPECIFIED;
+}
+
+#include <stdio.h>
+MAKE_SCHEME_CALLBACK (Beam, check_concave, 1);
+SCM
+Beam::check_concave (SCM smob)
+{
+ 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 ();)
+ {
+ if (Stem::invisible_b (stems[i]))
+ stems.del (i);
+ else
+ i++;
+ }
+
+ if (stems.size () < 3)
+ return SCM_UNSPECIFIED;
+
+ SCM s = me->get_grob_property ("concaveness-no-slope");
+
+ Real concave = 0;
+ if (!to_boolean (s))
+ {
+ /* Concaveness try #1: Sum distances of inner noteheads to line
+ between two outer noteheads. */
+
+ Real dy = Stem::chord_start_f (stems.top ())
+ - Stem::chord_start_f (stems[0]);
+ Real slope = dy / (stems.size () - 1);
+
+ Real y0 = Stem::chord_start_f (stems[0]);
+ for (int i = 1; i < stems.size () - 1; i++)
+ {
+ Real c = (Stem::chord_start_f (stems[i]) - y0) - i * slope;
+ concave += c;
+ }
+
+ }
+ else
+ {
+ /* Concaveness try #2: Sum distances of inner noteheads that
+ fall outside the interval of the two outer noteheads */
+
+ Interval iv = Interval (Stem::chord_start_f (stems[0]),
+ Stem::chord_start_f (stems.top ()));
+
+ if (iv[MAX] < iv[MIN])
+ // iv.swap ();
+ iv = Interval (iv[MAX], iv[MIN]);
+
+ for (int i = 1; i < stems.size () - 1; i++)
+ {
+ Real c = 0;
+ Real f = Stem::chord_start_f (stems[i]);
+ if ((c = f - iv[MAX]) > 0)
+ concave += c;
+ else if ((c = f - iv[MIN]) < 0)
+ concave += c;
+ }
+ }
+
+ concave *= Directional_element_interface::get (me);
+
+ Real concaveness = concave / (stems.size () - 2);
+
+ /* ugh: this is the a kludge to get input/regression/beam-concave.ly
+ to behave as baerenreiter. */
+ s = me->get_grob_property ("concaveness-square");
+ if (to_boolean (s))
+ concaveness /= (stems.size () - 2);
+
+ s = me->get_grob_property ("concaveness");
+ Real r = gh_scm2double (s);
+
+ if (concaveness > r)
+ {
+ Direction dir = Directional_element_interface::get (me);
+ Real y = gh_scm2double (me->get_grob_property ("y")) * dir;
+ Real dy = gh_scm2double (me->get_grob_property ("dy")) * dir;
+
+ Real adjusted_y = y + dy / 2;
+ /* Store true, not dir-corrected values */
+ me->set_grob_property ("y", gh_double2scm (adjusted_y * dir));
+ me->set_grob_property ("dy", gh_double2scm (0));
+ }
+
+ s = me->get_grob_property ("debug-concave");
+ if (to_boolean (s))
+ {
+#if 0
+ Item *text = new Item (me->get_property ("TextScript"));
+ text->set_grob_property ("text",
+ ly_str02scm (to_str (concaveness).ch_C ())),
+ Side_position_interface::add_support (text, stem[0]);
+#else
+ printf ("concaveness: %.2f\n", concaveness);
+#endif
+ }
+
+ return SCM_UNSPECIFIED;
+}
+
+/*
+ This neat trick is by Werner Lemberg,
+ damped = tanh (slope)
+ corresponds with some tables in [Wanske]
+*/
+MAKE_SCHEME_CALLBACK (Beam, slope_damping, 1);
+SCM
+Beam::slope_damping (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ if (visible_stem_count (me) <= 1)
+ return SCM_UNSPECIFIED;
+
+ SCM s = me->get_grob_property ("damping");
+ int damping = gh_scm2int (s);
+
+ if (damping)
+ {
+ /* y,dy in this function are corrected for beam-dir */
+ Direction dir = Directional_element_interface::get (me);
+ Real y = gh_scm2double (me->get_grob_property ("y")) * dir;
+ Real dy = gh_scm2double (me->get_grob_property ("dy")) * dir;
+
+ // 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;
+
+ Real damped_dy = dydx * dx;
+ Real adjusted_y = y + (dy - damped_dy) / 2;
+ /* Store true, not dir-corrected values */
+ me->set_grob_property ("y", gh_double2scm (adjusted_y * dir));
+ me->set_grob_property ("dy", gh_double2scm (damped_dy * dir));
+ }
+ return SCM_UNSPECIFIED;
+}
+
+/*
+ Quantise dy (height) of beam.
+ Generalisation of [Ross].
+ */
+MAKE_SCHEME_CALLBACK (Beam, quantise_dy, 1);
+SCM
+Beam::quantise_dy (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ if (visible_stem_count (me) <= 1)
+ return SCM_UNSPECIFIED;
+
+ 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 = ly_cdr (s))
+ a.push (gh_scm2double (ly_car (s)));
+
+ if (a.size () > 1)
+ {
+ /* y,dy in this function are corrected for beam-dir */
+ Direction dir = Directional_element_interface::get (me);
+ Real y = gh_scm2double (me->get_grob_property ("y")) * dir;
+ Real dy = gh_scm2double (me->get_grob_property ("dy")) * dir;
+
+ 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];
+
+ Real quantised_dy = q * sign (dy);
+ Real adjusted_y = y + (dy - quantised_dy) / 2;
+ /* Store true, not dir-corrected values */
+ me->set_grob_property ("y", gh_double2scm (adjusted_y * dir));
+ me->set_grob_property ("dy", gh_double2scm (quantised_dy * dir));
+ }
+ return SCM_UNSPECIFIED;
+}
+
+/* It's tricky to have the user override y,dy directly, so we use this
+ translation func. Also, if our staff_space != 1 (smaller staff, eg),
+ user will expect staff-position to be discrete values. */
+MAKE_SCHEME_CALLBACK (Beam, user_override, 1);
+SCM
+Beam::user_override (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+ SCM s = me->get_grob_property ("staff-position");
+ if (gh_number_p (s))
+ {
+ Real y = gh_scm2double (s) * staff_space * 0.5;
+ me->set_grob_property ("y", gh_double2scm (y));
+ }
+
+ /* Name suggestions? Tilt, slope, vertical-* ? */
+ s = me->get_grob_property ("height");
+ if (gh_number_p (s))
+ {
+ Real dy = gh_scm2double (s) * staff_space * 0.5;
+ me->set_grob_property ("dy", gh_double2scm (dy));
+ }
+
+ return SCM_UNSPECIFIED;
+}
+
+/*
+ Ugh, this must be last, after user_override
+ Assumes directionised y/dy.
+ */
+MAKE_SCHEME_CALLBACK (Beam, do_quantise_y, 1);
+SCM
+Beam::do_quantise_y (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ /*
+ If the user set y-position, we shouldn't do quanting.
+ */
+ if (gh_number_p (me->get_grob_property ("y-position-hs")))
+ return SCM_UNSPECIFIED;
+
+ Real y = gh_scm2double (me->get_grob_property ("y"));
+ Real dy = gh_scm2double (me->get_grob_property ("dy"));
+
+ /* we can modify y, so we should quantise y */
+ Real half_space = Staff_symbol_referencer::staff_space (me) / 2;
+ Real y_shift = check_stem_length_f (me, y, dy);
+ y += y_shift;
+ y = quantise_y_f (me, y, dy, 0);
+
+ /*
+ Hmm, this is a bit keyhole operation: we're passing `this' as a
+ parameter, and member vars as SCM properties. We should decide on
+ SCM/C/C++ boundary */
+ me->set_grob_property ("y", gh_double2scm (y));
+ set_stem_lengths (me);
+ y = gh_scm2double (me->get_grob_property ("y"));
+
+ 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);
+ }
+
+ me->set_grob_property ("y", gh_double2scm (y));
+ // me->set_grob_property ("dy", gh_double2scm (dy));
+ return SCM_UNSPECIFIED;
+}
+
+
+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;
+}
+
+Real
+Beam::check_stem_length_f (Grob*me,Real y, Real dy)
+{
+ Real shorten = 0;
+ Real lengthen = 0;
+ Direction dir = Directional_element_interface::get (me);
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_grobs (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;
+ }
+
+ if (lengthen && shorten)
+ me->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_stem_lengths (Grob *me)
+{
+ if (visible_stem_count (me) <= 1)
+ return;
+
+ Real y = gh_scm2double (me->get_grob_property ("y"));
+ Real dy = gh_scm2double (me->get_grob_property ("dy"));
+
+ Real half_space = Staff_symbol_referencer::staff_space (me)/2;
+ 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);
+
+ 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);
+
+ // doesn't play well with dvips
+ if (scm_definedp (ly_symbol2scm ("ps-testing"), SCM_UNDEFINED)
+ == SCM_BOOL_T)
+ if (Stem::get_direction (s) == Directional_element_interface::get (me))
+ stem_y += Stem::get_direction (s)
+ * gh_scm2double (me->get_grob_property ("thickness")) / 2;
+
+ /* caution: stem measures in staff-positions */
+ Real id = me->relative_coordinate (common, Y_AXIS)
+ - stems[i]->relative_coordinate (common, Y_AXIS);
+ Stem::set_stemend (s, (stem_y + id) / half_space);
+ }
+}
+
+/*
+ Prevent interference from stafflines and beams.
+
+ We only need to quantise the (left) y 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 (),
+ scm_list_n (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 = ly_cdr (quants))
+ a.push (gh_scm2double (ly_car (quants)));
+
+ if (a.size () <= 1)
+ return y;
+
+ Real up_y = Directional_element_interface::get (me) * y;
+ Interval iv = quantise_iv (a, up_y/staff_space) * staff_space;
+
+ Real q = up_y - iv[SMALLER] <= iv[BIGGER] - up_y
+ ? iv[SMALLER] : iv[BIGGER];
+ if (quant_dir)
+ q = iv[ (Direction)quant_dir];
+
+ return q * Directional_element_interface::get (me);
+}
+
+void
+Beam::set_beaming (Grob*me,Beaming_info_list *beaming)
+{
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "stems");
+
+ Direction d = LEFT;
+ for (int i=0; i < stems.size (); i++)
+ {
+ do
+ {
+ /* Don't overwrite user override (?) */
+ if (Stem::beam_count (stems[i], d) == 0
+ /* 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.
+
+ FIXME: clean me up.
+ */
+Molecule
+Beam::stem_beams (Grob*me,Item *here, Item *next, Item *prev,
+ Real /* dy */ , Real dydx
+ )
+{
+ // ugh -> use commonx
+ if ((next && ! (next->relative_coordinate (0, X_AXIS) > here->relative_coordinate (0, X_AXIS))) ||
+ (prev && ! (prev->relative_coordinate (0, X_AXIS) < here->relative_coordinate (0, X_AXIS))))
+ programming_error ("Beams are not left-to-right");
+
+ 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;
+
+#if 0
+ // 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;
+#endif
+
+ 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);
+
+ /* [Tremolo] beams on whole notes may not have direction set? */
+ if (dir == CENTER)
+ dir = Directional_element_interface::get (here);
+
+
+ /* half beams extending to the left. */
+ if (prev)
+ {
+ int lhalfs= lhalfs = Stem::beam_count (here,LEFT) - Stem::beam_count (prev,RIGHT);
+ int lwholebeams= Stem::beam_count (here,LEFT) <? Stem::beam_count (prev,RIGHT) ;
+ /*
+ Half beam should be one note-width,
+ but let's make sure two half-beams never touch
+ */
+
+ // 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::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 (-dir * bdy * (lwholebeams+j), Y_AXIS);
+ leftbeams.add_molecule (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);
+
+ Real stem_w = gh_scm2double (next->get_grob_property ("thickness"))
+ // URG
+ * me->paper_l ()->get_var ("stafflinethickness");
+
+ Molecule a = Lookup::beam (dydx, w + stem_w, thick);
+ a.translate_axis (- stem_w/2, X_AXIS);
+ int j = 0;
+ Real gap_f = 0;
+
+ SCM gap = me->get_grob_property ("gap");
+ if (gh_number_p (gap))
+ {
+ int gap_i = gh_scm2int ((gap));
+ int nogap = rwholebeams - gap_i;
+
+ for (; j < nogap; j++)
+ {
+ Molecule b (a);
+ b.translate_axis (-dir * bdy * j, Y_AXIS);
+ rightbeams.add_molecule (b);
+ }
+ if (Stem::invisible_b (here))
+ gap_f = nw_f;
+ else
+ gap_f = nw_f / 2;
+ w -= 2 * gap_f;
+ a = Lookup::beam (dydx, w + stem_w, thick);
+ }
+
+ for (; j < rwholebeams; j++)
+ {
+ Molecule b (a);
+ Real tx = 0;
+ if (Stem::invisible_b (here))
+ // ugh, see chord-tremolo.ly
+ tx = (-dir + 1) / 2 * nw_f * 1.5 + gap_f/4;
+ else
+ tx = gap_f;
+ b.translate (Offset (tx, -dir * bdy * j));
+ rightbeams.add_molecule (b);
+ }
+
+ 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_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
+ {
+ x0 = stems[0]->relative_coordinate (0, X_AXIS);
+ dx = stems.top ()->relative_coordinate (0, X_AXIS) - x0;
+ }
+
+
+
+ /*
+ TODO: the naming of the grob properties sucks.
+ */
+ SCM dy_s = me->get_grob_property ("dy");
+ SCM y_s = me->get_grob_property ("y");
+
+
+ Real dy = gh_number_p (dy_s) ? gh_scm2double (dy_s) : 0.0;
+ Real dydx = dy && dx ? dy/dx : 0;
+ Real y = gh_number_p (y_s) ? gh_scm2double (y_s) : 0.0;
+
+
+ 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, dy, dydx);
+ Real x = i->relative_coordinate (0, X_AXIS)-x0;
+ sb.translate (Offset (x, x * dydx + y));
+ mol.add_molecule (sb);
+ }
+ 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_grobs (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_grobs (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_grobs (me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size (); i++)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
+ }
+ return 0;
+}
+
+Item*
+Beam::last_visible_stem (Grob*me)
+{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ for (int i = stems.size (); i--;)
+ {
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
+ }
+ 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.
+ Real beam_dy = 0;
+ Real beam_y = 0;
+
+
+ // todo: make sure this calced already.
+ SCM s = beam->get_grob_property ("dy");
+ if (gh_number_p (s))
+ beam_dy = gh_scm2double (s);
+
+ s = beam->get_grob_property ("y");
+ 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"));
+}
+
projects / lilypond.git / commitdiff