source file of the GNU LilyPond music typesetter
- (c) 1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
- Jan Nieuwenhuizen <janneke@gnu.org>
-
+ (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
/*
- [TODO]
+ TODO:
- -* shorter! (now +- 1000 lines)
-
- -* less hairy code
+ - Determine auto knees based on positions if it's set by the user.
- -* Remove #'direction from beam. The beam has no direction per se.
- It may only set directions for stems.
- */
+ - the code is littered with * and / staff_space calls for
+ #'positions. Consider moving to real-world coordinates?
+
+ Problematic issue is user tweaks (user tweaks are in staff-coordinates.)
+
+ Notes:
+ - Stems run to the Y-center of the beam.
+
+ - beam_translation is the offset between Y centers of the beam.
+*/
#include <math.h> // tanh.
-#include "molecule.hh"
+#include "beam.hh"
+#include "interval-set.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 "output-def.hh"
#include "lookup.hh"
#include "group-interface.hh"
#include "staff-symbol-referencer.hh"
#include "spanner.hh"
#include "warn.hh"
+#if DEBUG_QUANTING
+#include "text-item.hh" // debug output.
+#include "font-interface.hh" // debug output.
+#endif
+
void
-Beam::add_stem (Grob*me, Grob*s)
+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 ());
+ assert (!Stem::get_beam (s));
+ s->set_property ("beam", me->self_scm ());
- add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
+ add_bound_item (dynamic_cast<Spanner *> (me), dynamic_cast<Item *> (s));
}
+Real
+Beam::get_thickness (Grob *me)
+{
+ return robust_scm2double (me->get_property ("thickness"), 0)
+ * Staff_symbol_referencer::staff_space (me);
+}
+
+/* Return the translation between 2 adjoining beams. */
+Real
+Beam::get_beam_translation (Grob *me)
+{
+ SCM func = me->get_property ("space-function");
+
+ if (ly_c_procedure_p (func))
+ {
+ SCM s = scm_call_2 (func, me->self_scm (), scm_int2num (get_beam_count (me)));
+ return scm_to_double (s);
+ }
+ else
+ {
+ return 0.81;
+ }
+}
+
+/* Maximum beam_count. */
int
-Beam::get_multiplicity (Grob*me)
+Beam::get_beam_count (Grob *me)
{
int m = 0;
- for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
+ for (SCM s = me->get_property ("stems"); scm_is_pair (s); s = scm_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);
+ Grob *stem = unsmob_grob (scm_car (s));
+ m = m >? (Stem::beam_multiplicity (stem).length () + 1);
}
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);
+ Space return space between beams.
+*/
+MAKE_SCHEME_CALLBACK (Beam, space_function, 2);
+SCM
+Beam::space_function (SCM smob, SCM beam_count)
+{
+ Grob *me = unsmob_grob (smob);
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real line = Staff_symbol_referencer::line_thickness (me);
+ Real thickness = get_thickness (me);
+
+ Real beam_translation = scm_to_int (beam_count) < 4
+ ? (2 * staff_space + line - thickness) / 2.0
+ : (3 * staff_space + line - thickness) / 3.0;
+
+ return scm_make_real (beam_translation);
+}
+
+/* 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);
+ 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)
+ /* 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 visible stems"));
+ me->warning (_ ("beam has less than two visible stems"));
- SCM stems = me->get_grob_property ("stems");
+ SCM stems = me->get_property ("stems");
if (scm_ilength (stems) == 1)
{
- warning (_("Beam has less than two stems. Removing beam."));
+ me->warning (_ ("removing beam with less than two stems"));
- unsmob_grob (gh_car (stems))->remove_grob_property ("beam");
+ unsmob_grob (scm_car (stems))->set_property ("beam", SCM_EOL);
me->suicide ();
return SCM_UNSPECIFIED;
else if (scm_ilength (stems) == 0)
{
me->suicide ();
- return SCM_UNSPECIFIED;
+ return SCM_UNSPECIFIED;
}
}
- if (visible_stem_count (me) >= 1)
+ if (count >= 1)
{
- if (!Directional_element_interface::get (me))
- Directional_element_interface::set (me, get_default_dir (me));
-
+ Direction d = get_default_dir (me);
+
consider_auto_knees (me);
- set_stem_directions (me);
+ set_stem_directions (me, d);
+
+ connect_beams (me);
+
set_stem_shorten (me);
}
+
return SCM_EOL;
}
-Direction
-Beam::get_default_dir (Grob*me)
+/* We want a maximal number of shared beams, but if there is choice, we
+ * take the one that is closest to the end of the stem. This is for
+ * situations like
+ *
+ * x
+ * |
+ * |
+ * |===|
+ * |=
+ * |
+ * x
+ */
+int
+position_with_maximal_common_beams (SCM left_beaming, SCM right_beaming,
+ Direction left_dir,
+ Direction right_dir)
{
- Drul_array<int> total;
- total[UP] = total[DOWN] = 0;
- Drul_array<int> count;
- count[UP] = count[DOWN] = 0;
- Direction d = DOWN;
+ Slice lslice = int_list_to_slice (scm_cdr (left_beaming));
- Link_array<Item> stems=
- Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+ int best_count = 0;
+ int best_start = 0;
+ for (int i = lslice[-left_dir];
+ (i - lslice[left_dir]) * left_dir <= 0; i += left_dir)
+ {
+ int count = 0;
+ for (SCM s = scm_car (right_beaming); scm_is_pair (s); s = scm_cdr (s))
+ {
+ int k = -right_dir * scm_to_int (scm_car (s)) + i;
+ if (scm_c_memq (scm_int2num (k), left_beaming) != SCM_BOOL_F)
+ count++;
+ }
- 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 (count >= best_count)
+ {
+ best_count = count;
+ best_start = i;
+ }
+ }
+
+ return best_start;
+}
+
+void
+Beam::connect_beams (Grob *me)
+{
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
- if (current)
+ Slice last_int;
+ last_int.set_empty ();
+ SCM last_beaming = SCM_EOL;
+ Direction last_dir = CENTER;
+ for (int i = 0; i < stems.size (); i++)
+ {
+ Grob *this_stem = stems[i];
+ SCM this_beaming = this_stem->get_property ("beaming");
+
+ Direction this_dir = get_grob_direction (this_stem);
+ if (scm_is_pair (last_beaming) && scm_is_pair (this_beaming))
{
- total[d] += current;
- count[d] ++;
+ int start_point = position_with_maximal_common_beams
+ (last_beaming, this_beaming,
+ last_dir, this_dir);
+
+ Direction d = LEFT;
+ Slice new_slice;
+ do
+ {
+ if (d == RIGHT && i == stems.size () - 1)
+ continue;
+
+ new_slice.set_empty ();
+ SCM s = index_get_cell (this_beaming, d);
+ for (; scm_is_pair (s); s = scm_cdr (s))
+ {
+ int new_beam_pos
+ = start_point - this_dir * scm_to_int (scm_car (s));
+
+ new_slice.add_point (new_beam_pos);
+ scm_set_car_x (s, scm_int2num (new_beam_pos));
+ }
+ }
+ while (flip (&d) != LEFT);
+
+ if (!new_slice.is_empty ())
+ last_int = new_slice;
+ }
+ else
+ {
+ scm_set_car_x (this_beaming, SCM_EOL);
+ SCM s = scm_cdr (this_beaming);
+ for (; scm_is_pair (s); s = scm_cdr (s))
+ {
+ int np = -this_dir * scm_to_int (scm_car (s));
+ scm_set_car_x (s, scm_int2num (np));
+ last_int.add_point (np);
+ }
}
- } 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 (i == stems.size () -1)
+ {
+ scm_set_cdr_x (this_beaming, SCM_EOL);
+ }
- 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"));
+ if (scm_ilength (scm_cdr (this_beaming)) > 0)
+ {
+ last_beaming = this_beaming;
+ last_dir = this_dir;
+ }
+ }
}
-
/*
- 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)
+ TODO: should not make beams per stem, but per Y-level.
+*/
+MAKE_SCHEME_CALLBACK (Beam, print, 1);
+SCM
+Beam::print (SCM grob)
{
- 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++)
+ Spanner *me = unsmob_spanner (grob);
+ position_beam (me);
+
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+ Grob *xcommon = common_refpoint_of_array (stems, me, X_AXIS);
+
+ xcommon = me->get_bound (LEFT)->common_refpoint (xcommon, X_AXIS);
+ xcommon = me->get_bound (RIGHT)->common_refpoint (xcommon, X_AXIS);
+
+ Real x0, dx;
+ if (visible_stem_count (me))
{
- 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);
+ // ugh -> use commonx
+ x0 = first_visible_stem (me)->relative_coordinate (xcommon, X_AXIS);
+ dx = last_visible_stem (me)->relative_coordinate (xcommon, X_AXIS) - x0;
+ }
+ else
+ {
+ x0 = stems[0]->relative_coordinate (xcommon, X_AXIS);
+ dx = stems.top ()->relative_coordinate (xcommon, X_AXIS) - x0;
}
-}
-/*
- Simplistic auto-knees; only consider vertical gap between two
- adjacent chords.
+ SCM posns = me->get_property ("positions");
+ Drul_array<Real> pos;
+ if (!is_number_pair (posns))
+ {
+ programming_error ("no beam positions?");
+ pos = Interval (0, 0);
+ }
+ else
+ pos = ly_scm2realdrul (posns);
- `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");
+ scale_drul (&pos, Staff_symbol_referencer::staff_space (me));
+
+ Real dy = pos[RIGHT] - pos[LEFT];
+ Real slope = (dy && dx) ? dy / dx : 0;
+
+ Real thick = get_thickness (me);
+ Real bdy = get_beam_translation (me);
- if (gh_number_p (scm))
+ SCM last_beaming = SCM_EOL;
+ Real last_xposn = -1;
+ Real last_stem_width = -1;
+
+ Real gap_length = robust_scm2double (me->get_property ("gap"), 0.0);
+
+ Stencil the_beam;
+ Real lt = me->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
+
+ for (int i = 0; i <= stems.size (); 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++)
- {
- 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);
+ Grob *st = (i < stems.size ()) ? stems[i] : 0;
- Real dy = right - left;
+ SCM this_beaming = st ? st->get_property ("beaming") : SCM_EOL;
+ Real xposn = st ? st->relative_coordinate (xcommon, X_AXIS) : 0.0;
+ Real stem_width = st ? robust_scm2double (st->get_property ("thickness"), 1.0) * lt : 0;
+ Direction stem_dir = st ? to_dir (st->get_property ("direction")) : CENTER;
+ /*
+ We do the space left of ST, with lfliebertjes pointing to the
+ right from the left stem, and rfliebertjes pointing left from
+ right stem.
+ */
+ SCM left = (i > 0) ? scm_cdr (last_beaming) : SCM_EOL;
+ SCM right = st ? scm_car (this_beaming) : SCM_EOL;
- if (abs (dy) >= gap)
+ Array<int> full_beams;
+ Array<int> lfliebertjes;
+ Array<int> rfliebertjes;
+
+ for (SCM s = left;
+ scm_is_pair (s); s = scm_cdr (s))
+ {
+ int b = scm_to_int (scm_car (s));
+ if (scm_c_memq (scm_car (s), right) != SCM_BOOL_F)
{
- knee_y = (right + left) / 2;
- knee_b = true;
- break;
+ full_beams.push (b);
+ }
+ else
+ {
+ lfliebertjes.push (b);
}
}
-
- if (knee_b)
+ for (SCM s = right;
+ scm_is_pair (s); s = scm_cdr (s))
{
- for (int i=0; i < stems.size (); i++)
+ int b = scm_to_int (scm_car (s));
+ if (scm_c_memq (scm_car (s), left) == SCM_BOOL_F)
{
- if (Stem::invisible_b (stems[i]))
- continue;
- Item *s = stems[i];
- Real y = Stem::extremal_heads (stems[i])[d]
- ->relative_coordinate (common, Y_AXIS);
+ rfliebertjes.push (b);
+ }
+ }
+
+ /*
+ how much to stick out for beams across linebreaks
+ */
+ Real break_overshoot = 3.0;
+ Real w = (i > 0 && st) ? (xposn - last_xposn) : break_overshoot;
+
+ Real stem_offset = 0.0;
+ if (i > 0)
+ {
+ w += last_stem_width / 2;
+ stem_offset = -last_stem_width / 2;
+ }
+
+ if (st)
+ w += stem_width / 2;
+
+ Real blot = me->get_layout ()->get_dimension (ly_symbol2scm ("blotdiameter"));
+ Stencil whole = Lookup::beam (slope, w, thick, blot);
+ Stencil gapped;
+
+ int gap_count = 0;
+ if (scm_is_number (me->get_property ("gap-count")))
+ {
+ gap_count = scm_to_int (me->get_property ("gap-count"));
+ gapped = Lookup::beam (slope, w - 2 * gap_length, thick, blot);
+
+ full_beams.sort (default_compare);
+ if (stem_dir == UP)
+ full_beams.reverse ();
+ }
+
+ int k = 0;
+ for (int j = full_beams.size (); j--;)
+ {
+ Stencil b (whole);
+
+ if (k++ < gap_count)
+ {
+ b = gapped;
+ b.translate_axis (gap_length, X_AXIS);
+ }
+ b.translate_axis (last_xposn - x0 + stem_offset, X_AXIS);
+ b.translate_axis (slope * (last_xposn - x0) + bdy * full_beams[j], Y_AXIS);
+
+ the_beam.add_stencil (b);
+ }
+
+ if (lfliebertjes.size () || rfliebertjes.size ())
+ {
+ Real nw_f;
- Directional_element_interface::set (s, y < knee_y ? UP : DOWN);
- s->set_grob_property ("dir-forced", SCM_BOOL_T);
+ if (st)
+ {
+ int t = Stem::duration_log (st);
+
+ SCM proc = me->get_property ("flag-width-function");
+ SCM result = scm_call_1 (proc, scm_int2num (t));
+ nw_f = scm_to_double (result);
+ }
+ else
+ nw_f = break_overshoot / 2;
+
+ /* Half beam should be one note-width,
+ but let's make sure two half-beams never touch */
+ Real lw = nw_f;
+ Real rw = nw_f;
+ if (i > 0)
+ rw = nw_f <? ((xposn - last_xposn) / 2);
+ else
+ /*
+ TODO: 0.5 is a guess.
+ */
+ rw = xposn - me->get_bound (LEFT)->extent (xcommon, X_AXIS)[RIGHT]
+ - 0.5;
+
+ if (st)
+ lw = nw_f <? ((xposn - last_xposn) / 2);
+ else
+ lw = me->get_bound (RIGHT)->relative_coordinate (xcommon, X_AXIS)
+ - last_xposn;
+
+ Stencil rhalf = Lookup::beam (slope, rw, thick, blot);
+ Stencil lhalf = Lookup::beam (slope, lw, thick, blot);
+ for (int j = lfliebertjes.size (); j--;)
+ {
+ Stencil b (lhalf);
+ b.translate_axis (last_xposn - x0, X_AXIS);
+ b.translate_axis (slope * (last_xposn - x0) + bdy * lfliebertjes[j], Y_AXIS);
+ the_beam.add_stencil (b);
+ }
+ for (int j = rfliebertjes.size (); j--;)
+ {
+ Stencil b (rhalf);
+ b.translate_axis (xposn - x0 - rw, X_AXIS);
+ b.translate_axis (slope * (xposn - x0 -rw) + bdy * rfliebertjes[j], Y_AXIS);
+ the_beam.add_stencil (b);
}
}
+
+ last_xposn = xposn;
+ last_stem_width = stem_width;
+ last_beaming = this_beaming;
}
+
+ the_beam.translate_axis (x0 - me->relative_coordinate (xcommon, X_AXIS), X_AXIS);
+ the_beam.translate_axis (pos[LEFT], Y_AXIS);
+
+#if (DEBUG_QUANTING)
+ SCM quant_score = me->get_property ("quant-score");
+ if (to_boolean (me->get_layout ()->lookup_variable (ly_symbol2scm ("debug-beam-quanting")))
+ && scm_is_string (quant_score))
+ {
+
+ /*
+ This code prints the demerits for each beam. Perhaps this
+ should be switchable for those who want to twiddle with the
+ parameters.
+ */
+ String str;
+ SCM properties = Font_interface::text_font_alist_chain (me);
+
+ Direction stem_dir = stems.size () ? to_dir (stems[0]->get_property ("direction")) : UP;
+
+ Stencil tm = *unsmob_stencil (Text_interface::interpret_markup
+ (me->get_layout ()->self_scm (), properties, quant_score));
+ the_beam.add_at_edge (Y_AXIS, stem_dir, tm, 1.0, 0);
+ }
+#endif
+
+ return the_beam.smobbed_copy ();
}
-/*
- Set stem's shorten property if unset.
- TODO:
- take some y-position (chord/beam/nearest?) into account
- scmify forced-fraction
- */
+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<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+
+ for (int i = 0; i < stems.size (); i++)
+ do
+ {
+ Grob *s = stems[i];
+ Direction sd = get_grob_direction (s);
+
+ int center_distance = int (- d * Stem::head_positions (s) [-d]) >? 0;
+ int current = sd ? (1 + d * sd) / 2 : center_distance;
+
+ if (current)
+ {
+ total[d] += current;
+ count[d]++;
+ }
+ }
+ while (flip (&d) != DOWN);
+
+ SCM func = me->get_property ("dir-function");
+ SCM s = scm_call_2 (func,
+ scm_cons (scm_int2num (count[UP]),
+ scm_int2num (count[DOWN])),
+ scm_cons (scm_int2num (total[UP]),
+ scm_int2num (total[DOWN])));
+
+ if (scm_is_number (s) && scm_to_int (s))
+ return to_dir (s);
+
+ /* If dir is not determined: get default */
+ return to_dir (me->get_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_shorten (Grob*m)
+Beam::set_stem_directions (Grob *me, Direction d)
{
- Spanner*me = dynamic_cast<Spanner*> (m);
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
- Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
- if (forced_fraction < 0.5)
- return;
+ for (int i = 0; i < stems.size (); i++)
+ {
+ Grob *s = stems[i];
- int multiplicity = get_multiplicity (me);
+ SCM forcedir = s->get_property ("direction");
+ if (!to_dir (forcedir))
+ set_grob_direction (s, d);
+ }
+}
- SCM shorten = me->get_grob_property ("beamed-stem-shorten");
- if (shorten == SCM_EOL)
+/*
+ Only try horizontal beams for knees. No reliable detection of
+ anything else is possible here, since we don't know funky-beaming
+ settings, or X-distances (slopes!) People that want sloped
+ knee-beams, should set the directions manually.
+
+
+ TODO:
+
+ this routine should take into account the stemlength scoring
+ of a possible knee/nonknee beam.
+*/
+void
+Beam::consider_auto_knees (Grob *me)
+{
+ SCM scm = me->get_property ("auto-knee-gap");
+ if (!scm_is_number (scm))
return;
- int sz = scm_ilength (shorten);
-
+ Interval_set gaps;
+
+ gaps.set_full ();
+
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+
+ Grob *common = common_refpoint_of_array (stems, me, Y_AXIS);
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;
+ Array<Interval> head_extents_array;
+ for (int i = 0; i < stems.size (); i++)
+ {
+ Grob *stem = stems[i];
+ if (Stem::is_invisible (stem))
+ continue;
+
+ Interval head_extents = Stem::head_positions (stem);
+ if (!head_extents.is_empty ())
+ {
+ head_extents[LEFT] += -1;
+ head_extents[RIGHT] += 1;
+ head_extents *= staff_space * 0.5;
+
+ /*
+ We could subtract beam Y position, but this routine only
+ sets stem directions, a constant shift does not have an
+ influence.
+ */
+ head_extents += stem->relative_coordinate (common, Y_AXIS);
+
+ if (to_dir (stem->get_property ("direction")))
+ {
+ Direction stemdir = to_dir (stem->get_property ("direction"));
+ head_extents[-stemdir] = -stemdir * infinity_f;
+ }
+ }
+ head_extents_array.push (head_extents);
+
+ gaps.remove_interval (head_extents);
+ }
- Link_array<Item> stems=
- Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+ Interval max_gap;
+ Real max_gap_len = 0.0;
- for (int i=0; i < stems.size (); i++)
+ for (int i = gaps.allowed_regions_.size () -1; i >= 0; 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));
+ Interval gap = gaps.allowed_regions_[i];
+
+ /*
+ the outer gaps are not knees.
+ */
+ if (isinf (gap[LEFT]) || isinf (gap[RIGHT]))
+ continue;
+
+ if (gap.length () >= max_gap_len)
+ {
+ max_gap_len = gap.length ();
+ max_gap = gap;
+ }
+ }
+
+ Real beam_translation = get_beam_translation (me);
+ Real beam_thickness = Beam::get_thickness (me);
+ int beam_count = Beam::get_beam_count (me);
+ Real height_of_beams = beam_thickness / 2
+ + (beam_count - 1) * beam_translation;
+ Real threshold = scm_to_double (scm) + height_of_beams;
+
+ if (max_gap_len > threshold)
+ {
+ int j = 0;
+ for (int i = 0; i < stems.size (); i++)
+ {
+ Grob *stem = stems[i];
+ if (Stem::is_invisible (stem))
+ continue;
+
+ Interval head_extents = head_extents_array[j++];
+
+ Direction d = (head_extents.center () < max_gap.center ())
+ ? UP : DOWN;
+
+ stem->set_property ("direction", scm_int2num (d));
+
+ head_extents.intersect (max_gap);
+ assert (head_extents.is_empty () || head_extents.length () < 1e-6);
+ }
}
}
-/*
- Call list of y-dy-callbacks, that handle setting of
- grob-properties y, dy.
+/* Set stem's shorten property if unset.
- User may set grob-properties: y-position-hs and height-hs
- (to be fixed) that override the calculated y and dy.
+TODO:
+take some y-position (chord/beam/nearest?) into account
+scmify forced-fraction
- Because y and dy cannot be calculated and quanted separately, we
- always calculate both, then check for user override.
- */
+This is done in beam because the shorten has to be uniform over the
+entire beam.
+*/
+void
+Beam::set_stem_shorten (Grob *me)
+{
+ /*
+ shortening looks silly for x staff beams
+ */
+ if (is_knee (me))
+ return;
+
+ Real forced_fraction = 1.0 * forced_stem_count (me)
+ / visible_stem_count (me);
+
+ int beam_count = get_beam_count (me);
+
+ SCM shorten_list = me->get_property ("beamed-stem-shorten");
+ if (shorten_list == SCM_EOL)
+ return;
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+ SCM shorten_elt
+ = robust_list_ref (beam_count -1, shorten_list);
+ Real shorten_f = scm_to_double (shorten_elt) * staff_space;
+
+ /* your similar cute comment here */
+ shorten_f *= forced_fraction;
+
+ if (shorten_f)
+ me->set_property ("shorten", scm_make_real (shorten_f));
+}
+
+/* Call list of y-dy-callbacks, that handle setting of
+ grob-properties
+*/
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);
+ Grob *me = unsmob_grob (smob);
+ position_beam (me);
return SCM_UNSPECIFIED;
}
+void
+Beam::position_beam (Grob *me)
+{
+ if (!me->is_live ())
+ return;
+ if (to_boolean (me->get_property ("positioning-done")))
+ return;
+
+ me->set_property ("positioning-done", SCM_BOOL_T);
+
+ /* Copy to mutable list. */
+ SCM s = ly_deep_copy (me->get_property ("positions"));
+ me->set_property ("positions", s);
+
+ if (scm_car (s) == SCM_BOOL_F)
+ {
+ // one wonders if such genericity is necessary --hwn.
+ SCM callbacks = me->get_property ("position-callbacks");
+ for (SCM i = callbacks; scm_is_pair (i); i = scm_cdr (i))
+ scm_call_1 (scm_car (i), me->self_scm ());
+ }
+
+ set_stem_lengths (me);
+}
+
+void
+set_minimum_dy (Grob *me, Real *dy)
+{
+ if (*dy)
+ {
+ /*
+ If dy is smaller than the smallest quant, we
+ get absurd direction-sign penalties.
+ */
+
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ Real thickness = Beam::get_thickness (me) / ss;
+ Real slt = Staff_symbol_referencer::line_thickness (me) / ss;
+ Real sit = (thickness - slt) / 2;
+ Real inter = 0.5;
+ Real hang = 1.0 - (thickness - slt) / 2;
+
+ *dy = sign (*dy) * (fabs (*dy)
+ >?
+ (sit <? inter <? hang));
+ }
+}
+
+/*
+ Compute a first approximation to the beam slope.
+*/
+MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
+SCM
+Beam::least_squares (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+
+ int count = visible_stem_count (me);
+ Interval pos (0, 0);
+
+ if (count < 1)
+ {
+ me->set_property ("positions", ly_interval2scm (pos));
+ return SCM_UNSPECIFIED;
+ }
+
+ Array<Real> x_posns;
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+ Grob *commonx = common_refpoint_of_array (stems, me, X_AXIS);
+ Grob *commony = common_refpoint_of_array (stems, me, Y_AXIS);
+
+ Real my_y = me->relative_coordinate (commony, Y_AXIS);
+
+ Grob *fvs = first_visible_stem (me);
+ Grob *lvs = last_visible_stem (me);
+
+ Interval ideal (Stem::get_stem_info (fvs).ideal_y_
+ + fvs->relative_coordinate (commony, Y_AXIS) -my_y,
+ Stem::get_stem_info (lvs).ideal_y_
+ + lvs->relative_coordinate (commony, Y_AXIS) - my_y);
-MAKE_SCHEME_CALLBACK (Beam, least_squares, 1);
-SCM
-Beam::least_squares (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
+ Real x0 = first_visible_stem (me)->relative_coordinate (commonx, X_AXIS);
+ for (int i = 0; i < stems.size (); i++)
+ {
+ Grob *s = stems[i];
- if (visible_stem_count (me) <= 1)
- return SCM_UNSPECIFIED;
+ Real x = s->relative_coordinate (commonx, X_AXIS) - x0;
+ x_posns.push (x);
+ }
+ Real dx = last_visible_stem (me)->relative_coordinate (commonx, X_AXIS) - x0;
Real y = 0;
+ Real slope = 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_)
+ if (!ideal.delta ())
{
- y = first_ideal;
- dy = 0;
+ Interval chord (Stem::chord_start_y (first_visible_stem (me)),
+ Stem::chord_start_y (last_visible_stem (me)));
+
+ /* Simple beams (2 stems) on middle line should be allowed to be
+ slightly sloped.
+
+ However, if both stems reach middle line,
+ ideal[LEFT] == ideal[RIGHT] and ideal.delta () == 0.
+
+ For that case, we apply artificial slope */
+ if (!ideal[LEFT] && chord.delta () && count == 2)
+ {
+ /* FIXME. -> UP */
+ Direction d = (Direction) (sign (chord.delta ()) * UP);
+ pos[d] = get_thickness (me) / 2;
+ pos[-d] = -pos[d];
+ }
+ else
+ {
+ pos = ideal;
+ }
+
+ /*
+ For broken beams this doesn't work well. In this case, the
+ slope esp. of the first part of a broken beam should predict
+ where the second part goes.
+ */
+ me->set_property ("least-squares-dy",
+ scm_make_real (pos[RIGHT] - pos[LEFT]));
}
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++)
+ for (int i = 0; i < stems.size (); i++)
{
- Item* s = stems[i];
- if (Stem::invisible_b (s))
+ Grob *s = stems[i];
+ if (Stem::is_invisible (s))
continue;
- ideals.push (Offset (s->relative_coordinate (0, X_AXIS) - x0,
- Stem::calc_stem_info (s).idealy_f_));
+ ideals.push (Offset (x_posns[i],
+ Stem::get_stem_info (s).ideal_y_
+ + s->relative_coordinate (commony, Y_AXIS)
+ - my_y));
}
- Real dydx;
- minimise_least_squares (&dydx, &y, ideals);
- Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
- dy = dydx * dx;
- }
+ minimise_least_squares (&slope, &y, ideals);
- /* 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;
-}
+ dy = slope * dx;
-MAKE_SCHEME_CALLBACK (Beam, cancel_suspect_slope, 1);
-SCM
-Beam::cancel_suspect_slope (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
- if (visible_stem_count (me) <= 1)
- return SCM_UNSPECIFIED;
-
- /* Stem_info, and thus 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;
-
- /* 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"));
+ set_minimum_dy (me, &dy);
+ me->set_property ("least-squares-dy", scm_make_real (dy));
+ pos = Interval (y, (y + dy));
+ }
- // 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;
+ /*
+ "position" is relative to the staff.
+ */
+ scale_drul (&pos, 1 / Staff_symbol_referencer::staff_space (me));
+
+ me->set_property ("positions", ly_interval2scm (pos));
- if (( (y - first_ideal > lengthened) && (dydx > steep))
- || ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
- {
- 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));
- }
return SCM_UNSPECIFIED;
}
/*
- This neat trick is by Werner Lemberg,
- damped = tanh (slope)
- corresponds with some tables in [Wanske]
+ We can't combine with previous function, since check concave and
+ slope damping comes first.
+
+ TODO: we should use the concaveness to control the amount of damping
+ applied.
*/
-MAKE_SCHEME_CALLBACK (Beam, slope_damping, 1);
+MAKE_SCHEME_CALLBACK (Beam, shift_region_to_valid, 1);
SCM
-Beam::slope_damping (SCM smob)
+Beam::shift_region_to_valid (SCM grob)
{
- Grob *me = unsmob_grob (smob);
+ Grob *me = unsmob_grob (grob);
+ /*
+ Code dup.
+ */
+ Array<Real> x_posns;
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+ Grob *commonx = common_refpoint_of_array (stems, me, X_AXIS);
+ Grob *commony = common_refpoint_of_array (stems, me, Y_AXIS);
- if (visible_stem_count (me) <= 1)
- return SCM_UNSPECIFIED;
+ Grob *fvs = first_visible_stem (me);
- SCM s = me->get_grob_property ("damping");
- int damping = gh_scm2int (s);
+ if (!fvs)
+ return SCM_UNSPECIFIED;
- if (damping)
+ Real x0 = fvs->relative_coordinate (commonx, X_AXIS);
+ for (int i = 0; i < stems.size (); i++)
{
- /* 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));
+ Grob *s = stems[i];
+
+ Real x = s->relative_coordinate (commonx, X_AXIS) - x0;
+ x_posns.push (x);
}
+
+ Grob *lvs = last_visible_stem (me);
+ if (!lvs)
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);
+ Real dx = lvs->relative_coordinate (commonx, X_AXIS) - x0;
- if (visible_stem_count (me) <= 1)
- return SCM_UNSPECIFIED;
+ Drul_array<Real> pos = ly_scm2interval (me->get_property ("positions"));
- 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;
-}
+ scale_drul (&pos, Staff_symbol_referencer::staff_space (me));
-/* 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);
+ Real dy = pos[RIGHT] - pos[LEFT];
+ Real y = pos[LEFT];
+ Real slope = dy / dx;
- SCM s = me->get_grob_property ("staff-position");
- if (gh_number_p (s))
+ /*
+ Shift the positions so that we have a chance of finding good
+ quants (i.e. no short stem failures.)
+ */
+ Interval feasible_left_point;
+ feasible_left_point.set_full ();
+ for (int i = 0; i < stems.size (); i++)
{
- Real y = gh_scm2double (s) * staff_space * 0.5;
- me->set_grob_property ("y", gh_double2scm (y));
+ Grob *s = stems[i];
+ if (Stem::is_invisible (s))
+ continue;
+
+ Direction d = Stem::get_direction (s);
+
+ Real left_y
+ = Stem::get_stem_info (s).shortest_y_
+ - slope * x_posns [i];
+
+ /*
+ left_y is now relative to the stem S. We want relative to
+ ourselves, so translate:
+ */
+ left_y
+ += + s->relative_coordinate (commony, Y_AXIS)
+ - me->relative_coordinate (commony, Y_AXIS);
+
+ Interval flp;
+ flp.set_full ();
+ flp[-d] = left_y;
+
+ feasible_left_point.intersect (flp);
}
- /* Name suggestions? Tilt, slope, vertical-* ? */
- s = me->get_grob_property ("height");
- if (gh_number_p (s))
+ if (feasible_left_point.is_empty ())
+ warning (_ ("no viable initial configuration found: may not find good beam slope"));
+ else if (!feasible_left_point.contains (y))
{
- Real dy = gh_scm2double (s) * staff_space * 0.5;
- me->set_grob_property ("dy", gh_double2scm (dy));
+ if (isinf (feasible_left_point[DOWN]))
+ y = feasible_left_point[UP] - REGION_SIZE;
+ else if (isinf (feasible_left_point[UP]))
+ y = feasible_left_point[DOWN]+ REGION_SIZE;
+ else
+ y = feasible_left_point.center ();
}
-
+
+ pos = Drul_array<Real> (y, (y + dy));
+ scale_drul (&pos, 1 / Staff_symbol_referencer::staff_space (me));
+
+ me->set_property ("positions", ly_interval2scm (pos));
return SCM_UNSPECIFIED;
}
-/*
- Ugh, this must be last, after user_override
- Assumes directionised y/dy.
- */
-MAKE_SCHEME_CALLBACK (Beam, do_quantise_y, 1);
+/* 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::do_quantise_y (SCM smob)
+Beam::slope_damping (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")))
+ if (visible_stem_count (me) <= 1)
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);
+ SCM s = me->get_property ("damping");
+ Real damping = scm_to_double (s);
- if (y_shift > half_space / 4)
+ if (damping)
{
- 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;
-}
-
+ Drul_array<Real> pos = ly_scm2interval (me->get_property ("positions"));
+ scale_drul (&pos, Staff_symbol_referencer::staff_space (me));
-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;
+ Real dy = pos[RIGHT] - pos[LEFT];
- SCM space_proc = me->get_grob_property ("space-function");
- SCM space = gh_call1 (space_proc, gh_int2scm (beam_multiplicity));
+ Grob *fvs = first_visible_stem (me);
+ Grob *lvs = last_visible_stem (me);
- Real thick = gh_scm2double (me->get_grob_property ("thickness")) ;
- Real interbeam_f = gh_scm2double (space) ;
+ Grob *commonx = fvs->common_refpoint (lvs, X_AXIS);
- // 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);
+ Real dx = last_visible_stem (me)->relative_coordinate (commonx, X_AXIS)
+ - first_visible_stem (me)->relative_coordinate (commonx, X_AXIS);
+ Real slope = dy && dx ? dy / dx : 0;
-
- // 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;
- }
+ Real concaveness = robust_scm2double (me->get_property ("concaveness"), 0.0);
- return stem_y;
-}
+ slope = 0.6 * tanh (slope) / (damping + concaveness);
-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);
+ Real damped_dy = slope * dx;
- Link_array<Item> stems=
- Pointer_group_interface__extract_grobs (me, (Item*)0, "stems");
+ set_minimum_dy (me, &damped_dy);
- for (int i=0; i < stems.size (); i++)
- {
- Item* s = stems[i];
- if (Stem::invisible_b (s))
- continue;
+ pos[LEFT] += (dy - damped_dy) / 2;
+ pos[RIGHT] -= (dy - damped_dy) / 2;
- Real stem_y = calc_stem_y_f (me, s, y, dy);
-
- stem_y *= dir;
- Stem_info info = Stem::calc_stem_info (s);
+ scale_drul (&pos, 1 / Staff_symbol_referencer::staff_space (me));
- // 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;
+ me->set_property ("positions", ly_interval2scm (pos));
}
-
- if (lengthen && shorten)
- warning (_ ("weird beam vertical offset"));
-
- /* when all stems are too short, normal stems win */
- return dir * ((shorten) ? shorten : lengthen);
+ return SCM_UNSPECIFIED;
}
/*
- 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)
+ Report slice containing the numbers that are both in (car BEAMING)
+ and (cdr BEAMING)
+*/
+Slice
+where_are_the_whole_beams (SCM beaming)
{
- 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");
+ Slice l;
- 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++)
+ for (SCM s = scm_car (beaming); scm_is_pair (s); s = scm_cdr (s))
{
- Item* s = stems[i];
- if (Stem::invisible_b (s))
- continue;
+ if (scm_c_memq (scm_car (s), scm_cdr (beaming)) != SCM_BOOL_F)
- 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);
+ l.add_point (scm_to_int (scm_car (s)));
}
-}
-/*
- Prevent interference from stafflines and beams.
+ return l;
+}
- 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
- */
+/* Return the Y position of the stem-end, given the Y-left, Y-right
+ in POS for stem S. This Y position is relative to S. */
Real
-Beam::quantise_y_f (Grob*me,Real y, Real dy, int quant_dir)
+Beam::calc_stem_y (Grob *me, Grob *s, Grob ** common,
+ Real xl, Real xr,
+ Drul_array<Real> pos, bool french)
{
- int multiplicity = get_multiplicity (me);
-
- Real staff_space = Staff_symbol_referencer::staff_space (me);
- Real thick = me->paper_l ()->get_var ("stafflinethickness");
+ Real beam_translation = get_beam_translation (me);
+ Real r = s->relative_coordinate (common[X_AXIS], X_AXIS) - xl;
+ Real dy = pos[RIGHT] - pos[LEFT];
+ Real dx = xr - xl;
+ Real stem_y_beam0 = (dy && dx
+ ? r / dx
+ * dy
+ : 0) + pos[LEFT];
- 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;
+ Direction my_dir = get_grob_direction (s);
+ SCM beaming = s->get_property ("beaming");
- 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++)
+ Real stem_y = stem_y_beam0;
+ if (french)
{
- 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);
+ Slice bm = where_are_the_whole_beams (beaming);
+ if (!bm.is_empty ())
+ stem_y += beam_translation * bm[-my_dir];
+ }
+ else
+ {
+ Slice bm = Stem::beam_multiplicity (s);
+ if (!bm.is_empty ())
+ stem_y += bm[my_dir] * beam_translation;
}
-}
+ Real id = me->relative_coordinate (common[Y_AXIS], Y_AXIS)
+ - s->relative_coordinate (common[Y_AXIS], Y_AXIS);
+ return stem_y + id;
+}
/*
- 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
- )
+ 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)
{
- // 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);
- }
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+ if (!stems.size ())
+ return;
- 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);
+ Grob *common[2];
+ for (int a = 2; a--;)
+ common[a] = common_refpoint_of_array (stems, me, Axis (a));
+ Drul_array<Real> pos = ly_scm2realdrul (me->get_property ("positions"));
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ scale_drul (&pos, staff_space);
- /* half beams extending to the left. */
- if (prev)
+ bool gap = false;
+ Real thick = 0.0;
+ if (scm_is_number (me->get_property ("gap-count"))
+ &&scm_to_int (me->get_property ("gap-count")))
{
- 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);
- }
+ gap = true;
+ thick = get_thickness (me);
}
- 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");
+ // ugh -> use commonx
+ Grob *fvs = first_visible_stem (me);
+ Grob *lvs = last_visible_stem (me);
- 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);
- }
+ Real xl = fvs ? fvs->relative_coordinate (common[X_AXIS], X_AXIS) : 0.0;
+ Real xr = lvs ? lvs->relative_coordinate (common[X_AXIS], X_AXIS) : 0.0;
- 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);
- }
+ for (int i = 0; i < stems.size (); i++)
+ {
+ Grob *s = stems[i];
+ if (Stem::is_invisible (s))
+ continue;
- w = w/2 <? nw_f;
- if (rhalfs)
- a = Lookup::beam (dydx, w, thick);
+ bool french = to_boolean (s->get_property ("french-beaming"));
+ Real stem_y = calc_stem_y (me, s, common,
+ xl, xr,
+ pos, french && s != lvs && s!= fvs);
- for (; j < rwholebeams + rhalfs; j++)
- {
- Molecule b (a);
- b.translate_axis (- dir * bdy * j, Y_AXIS);
- rightbeams.add_molecule (b);
- }
+ /*
+ Make the stems go up to the end of the beam. This doesn't matter
+ for normal beams, but for tremolo beams it looks silly otherwise.
+ */
+ if (gap)
+ stem_y += thick * 0.5 * get_grob_direction (s);
+ Stem::set_stemend (s, 2 * stem_y / staff_space);
}
- 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)
+void
+Beam::set_beaming (Grob *me, Beaming_info_list *beaming)
{
- 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;
- }
-
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+ Direction d = LEFT;
+ for (int i = 0; i < stems.size (); i++)
+ {
+ /*
+ Don't overwrite user settings.
+ */
- /*
- 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;
+ do
+ {
+ /* Don't set beaming for outside of outer stems */
+ if ((d == LEFT && i == 0)
+ || (d == RIGHT && i == stems.size () -1))
+ continue;
+ Grob *st = stems[i];
+ SCM beaming_prop = st->get_property ("beaming");
+ if (beaming_prop == SCM_EOL
+ || index_get_cell (beaming_prop, d) == SCM_EOL)
+ {
+ int b = beaming->infos_.elem (i).beams_i_drul_[d];
+ if (i > 0
+ && i < stems.size () -1
+ && Stem::is_invisible (st))
+ b = b <? beaming->infos_.elem (i).beams_i_drul_[-d];
- 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);
+ Stem::set_beaming (st, b, d);
+ }
+ }
+ while (flip (&d) != LEFT);
}
- 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)
+Beam::forced_stem_count (Grob *me)
{
- Link_array<Item>stems =
- Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
int f = 0;
- for (int i=0; i < stems.size (); i++)
+ for (int i = 0; i < stems.size (); i++)
{
- Item *s = stems[i];
+ Grob *s = stems[i];
- if (Stem::invisible_b (s))
+ if (Stem::is_invisible (s))
continue;
- if (( (int)Stem::chord_start_f (s))
- && (Stem::get_direction (s) != Stem::get_default_dir (s)))
- f++;
+ /* I can imagine counting those boundaries as a half forced stem,
+ but let's count them full for now. */
+ if (abs (Stem::chord_start_y (s)) > 0.1
+ && (Stem::get_direction (s) != Stem::get_default_dir (s)))
+ f++;
}
return f;
}
-
-
-
-/* TODO:
- use filter and standard list functions.
- */
int
-Beam::visible_stem_count (Grob*me)
+Beam::visible_stem_count (Grob *me)
{
- Link_array<Item>stems =
- Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
int c = 0;
for (int i = stems.size (); i--;)
{
- if (!Stem::invisible_b (stems[i]))
- c++;
+ if (!Stem::is_invisible (stems[i]))
+ c++;
}
return c;
}
-Item*
-Beam::first_visible_stem (Grob*me)
+Grob *
+Beam::first_visible_stem (Grob *me)
{
- Link_array<Item>stems =
- Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
-
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+
for (int i = 0; i < stems.size (); i++)
{
- if (!Stem::invisible_b (stems[i]))
- return stems[i];
+ if (!Stem::is_invisible (stems[i]))
+ return stems[i];
}
return 0;
}
-Item*
-Beam::last_visible_stem (Grob*me)
+Grob *
+Beam::last_visible_stem (Grob *me)
{
- Link_array<Item>stems =
- Pointer_group_interface__extract_grobs (me, (Item*) 0, "stems");
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
for (int i = stems.size (); i--;)
{
- if (!Stem::invisible_b (stems[i]))
- return stems[i];
+ if (!Stem::is_invisible (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 ()
+
+ rest -> stem -> beam -> interpolate_y_position ()
*/
-MAKE_SCHEME_CALLBACK (Beam,rest_collision_callback,2);
+MAKE_SCHEME_CALLBACK (Beam, rest_collision_callback, 2);
SCM
Beam::rest_collision_callback (SCM element_smob, SCM axis)
{
Grob *rest = unsmob_grob (element_smob);
- Axis a = (Axis) gh_scm2int (axis);
-
+ Axis a = (Axis) scm_to_int (axis);
+
+ if (scm_is_number (rest->get_property ("staff-position")))
+ return scm_int2num (0);
+
assert (a == Y_AXIS);
- Grob * st = unsmob_grob (rest->get_grob_property ("stem"));
- Grob * stem = st;
+ Grob *st = unsmob_grob (rest->get_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);
-
+ return scm_make_real (0.0);
+ Grob *beam = unsmob_grob (stem->get_property ("beam"));
+ if (!beam
+ || !Beam::has_interface (beam)
+ || !Beam::visible_stem_count (beam))
+ return scm_make_real (0.0);
+
+ Drul_array<Real> pos (0, 0);
+ SCM s = beam->get_property ("positions");
+ if (scm_is_pair (s) && scm_is_number (scm_car (s)))
+ pos = ly_scm2interval (s);
+ Real staff_space = Staff_symbol_referencer::staff_space (rest);
+
+ scale_drul (&pos, staff_space);
+
+ Real dy = pos[RIGHT] - pos[LEFT];
+
// ugh -> use commonx
Real x0 = first_visible_stem (beam)->relative_coordinate (0, X_AXIS);
Real dx = last_visible_stem (beam)->relative_coordinate (0, X_AXIS) - x0;
- Real dydx = beam_dy && dx ? beam_dy/dx : 0;
+ Real slope = dy && dx ? dy / dx : 0;
Direction d = Stem::get_direction (stem);
- Real beamy = (stem->relative_coordinate (0, X_AXIS) - x0) * dydx + beam_y;
+ Real stem_y = pos[LEFT] + (stem->relative_coordinate (0, X_AXIS) - x0) * slope;
+
+ Real beam_translation = get_beam_translation (beam);
+ Real beam_thickness = Beam::get_thickness (beam);
- Real staff_space = Staff_symbol_referencer::staff_space (rest);
+ /*
+ TODO: this is not strictly correct for 16th knee beams.
+ */
+ int beam_count
+ = Stem::beam_multiplicity (stem).length () + 1;
-
- Real rest_dim = rest->extent (rest, Y_AXIS)[d]*2.0 / staff_space ; // refp??
+ Real height_of_my_beams = beam_thickness / 2
+ + (beam_count - 1) * beam_translation;
+ Real beam_y = stem_y - d * height_of_my_beams;
- Real minimum_dist
- = gh_scm2double (rest->get_grob_property ("minimum-beam-collision-distance"));
- Real dist =
- minimum_dist + -d * (beamy - rest_dim) >? 0;
+ Grob *common_y = rest->common_refpoint (beam, Y_AXIS);
- int stafflines = Staff_symbol_referencer::line_count (rest);
+ Real rest_dim = rest->extent (common_y, Y_AXIS)[d];
+ Real minimum_distance
+ = + staff_space * (robust_scm2double (stem->get_property ("stemlet-length"), 0.0)
+ + robust_scm2double (rest->get_property ("minimum-distance"), 0.0));
- // move discretely by half spaces.
- int discrete_dist = int (ceil (dist));
+ Real shift = d * (((beam_y - d * minimum_distance) - rest_dim) * d <? 0.0);
- // move by whole spaces inside the staff.
- if (discrete_dist < stafflines+1)
- discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
+ shift /= staff_space;
+ Real rad = Staff_symbol_referencer::line_count (rest) * staff_space / 2;
- return gh_double2scm (-d * discrete_dist);
-}
+ /* Always move discretely by half spaces */
+ shift = ceil (fabs (shift * 2.0)) / 2.0 * sign (shift);
+
+ /* Inside staff, move by whole spaces*/
+ if ((rest->extent (common_y, Y_AXIS)[d] + staff_space * shift) * d
+ < rad
+ || (rest->extent (common_y, Y_AXIS)[-d] + staff_space * shift) * -d
+ < rad)
+ shift = ceil (fabs (shift)) * sign (shift);
+ return scm_make_real (staff_space * shift);
+}
bool
-Beam::has_interface (Grob*me)
+Beam::is_knee (Grob *me)
+{
+ SCM k = me->get_property ("knee");
+ if (scm_is_bool (k))
+ return ly_scm2bool (k);
+
+ bool knee = false;
+ int d = 0;
+ for (SCM s = me->get_property ("stems"); scm_is_pair (s); s = scm_cdr (s))
+ {
+ Direction dir = get_grob_direction (unsmob_grob (scm_car (s)));
+ if (d && d != dir)
+ {
+ knee = true;
+ break;
+ }
+ d = dir;
+ }
+
+ me->set_property ("knee", ly_bool2scm (knee));
+
+ return knee;
+}
+
+int
+Beam::get_direction_beam_count (Grob *me, Direction d)
{
- return me->has_interface (ly_symbol2scm ("beam-interface"));
+ Link_array<Grob> stems
+ = extract_grob_array (me, ly_symbol2scm ("stems"));
+ int bc = 0;
+
+ for (int i = stems.size (); i--;)
+ {
+ /*
+ Should we take invisible stems into account?
+ */
+ if (Stem::get_direction (stems[i]) == d)
+ bc = bc >? (Stem::beam_multiplicity (stems[i]).length () + 1);
+ }
+
+ return bc;
}
+ADD_INTERFACE (Beam, "beam-interface",
+ "A beam. \n\n"
+ "The @code{thickness} property is the weight of beams, and is measured "
+ "in staffspace",
+ "knee positioning-done position-callbacks "
+ "concaveness dir-function quant-score auto-knee-gap gap "
+ "gap-count chord-tremolo beamed-stem-shorten shorten least-squares-dy "
+ "damping inspect-quants flag-width-function neutral-direction positions space-function "
+ "thickness");
+