source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
*/
/*
[TODO]
- * less hairy code
- * move paper vars to scm
-*/
+ -* shorter! (now +- 1000 lines)
+
+ -* less hairy code
+
+ */
-#include <math.h> // tanh.
+#include <math.h> // tanh.
+#include "molecule.hh"
#include "directional-element-interface.hh"
#include "beaming.hh"
-#include "dimensions.hh"
#include "beam.hh"
#include "misc.hh"
-#include "debug.hh"
#include "least-squares.hh"
#include "stem.hh"
#include "paper-def.hh"
#include "lookup.hh"
#include "group-interface.hh"
#include "staff-symbol-referencer.hh"
-#include "cross-staff.hh"
-#include "lily-guile.icc"
-
-Beam::Beam ()
-{
- Group_interface g (this, "stems");
- g.set_interface ();
-}
+#include "item.hh"
+#include "spanner.hh"
+#include "warn.hh"
void
-Beam::add_stem (Stem*s)
+Beam::add_stem (Grob*me, Grob*s)
{
- Group_interface gi (this, "stems");
- gi.add_element (s);
+ Pointer_group_interface:: add_element (me, "stems", s);
- s->add_dependency (this);
+ s->add_dependency (me);
- assert (!s->beam_l ());
- s->set_elt_property ("beam", self_scm_);
+ assert (!Stem::beam_l (s));
+ s->set_grob_property ("beam", me->self_scm ());
- if (!get_bound (LEFT))
- set_bound (LEFT,s);
- else
- set_bound (RIGHT,s);
+ add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (s));
}
int
-Beam::get_multiplicity () const
+Beam::get_multiplicity (Grob*me)
{
int m = 0;
- for (SCM s = get_elt_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
+ for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
{
- Score_element * sc = unsmob_element (gh_car (s));
+ Grob * sc = unsmob_grob (gh_car (s));
- if (Stem * st = dynamic_cast<Stem*> (sc))
- m = m >? st->beam_count (LEFT) >? st->beam_count (RIGHT);
+ if (Stem::has_interface (sc))
+ m = m >? Stem::beam_count (sc,LEFT) >? Stem::beam_count (sc,RIGHT);
}
return m;
}
[Alternatively, stems could set its own directions, according to
their beam, during 'final-pre-processing'.]
*/
-void
-Beam::before_line_breaking ()
+MAKE_SCHEME_CALLBACK (Beam,before_line_breaking,1);
+SCM
+Beam::before_line_breaking (SCM smob)
{
+ Grob * me = unsmob_grob (smob);
+
// Why?
- if (visible_stem_count () < 2)
+ /*
+ Why what? Why the warning (beams with less than 2 stems are
+ degenerate beams, should never happen), or why would this ever
+ happen (don't know). */
+ if (visible_stem_count (me) < 2)
{
warning (_ ("beam has less than two stems"));
- // set_elt_property ("transparent", SCM_BOOL_T);
}
-
- if (!directional_element (this).get ())
- directional_element (this).set (get_default_dir ());
-
- auto_knees ();
- set_stem_directions ();
- set_stem_shorten ();
+ 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;
}
-/*
- FIXME
- */
Direction
-Beam::get_default_dir () const
+Beam::get_default_dir (Grob*me)
{
Drul_array<int> total;
total[UP] = total[DOWN] = 0;
count[UP] = count[DOWN] = 0;
Direction d = DOWN;
- for (int i=0; i <stem_count (); i++)
- do { // HUH -- waar slaat dit op?
- Stem *s = stem (i);
- Direction sd = directional_element (s).get ();
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (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
- : s->get_center_distance ((Direction)-d);
+ : Stem::get_center_distance (s, (Direction)-d);
if (current)
{
count[d] ++;
}
- } while (flip(&d) != DOWN);
+ } 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])));
- SCM s = scm_eval (gh_list (ly_symbol2scm ("beam-dir-algorithm"),
- ly_quote_scm (gh_cons (gh_int2scm (count[UP]),
- gh_int2scm (count[DOWN]))),
- ly_quote_scm (gh_cons (gh_int2scm (total[UP]),
- gh_int2scm (total[DOWN]))),
- SCM_UNDEFINED));
if (gh_number_p (s) && gh_scm2int (s))
return to_dir (s);
/*
- If dir is not determined: get from paper
+ If dir is not determined: get default
*/
- return (Direction)(int)
- paper_l ()->get_var ("stem_default_neutral_direction");
+ return to_dir (me->get_grob_property ("neutral-direction"));
}
once stem gets cleaned-up.
*/
void
-Beam::set_stem_directions ()
+Beam::set_stem_directions (Grob*me)
{
- Direction d = directional_element (this).get ();
- for (int i=0; i <stem_count (); i++)
+ Link_array<Item> stems
+ =Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ Direction d = Directional_element_interface::get (me);
+
+ for (int i=0; i <stems.size (); i++)
{
- Stem *s = stem (i);
- SCM force = s->remove_elt_property ("dir-forced");
+ Grob *s = stems[i];
+ SCM force = s->remove_grob_property ("dir-forced");
if (!gh_boolean_p (force) || !gh_scm2bool (force))
- directional_element (s).set (d);
+ Directional_element_interface ::set (s,d);
}
}
-void
-Beam::auto_knees ()
-{
- if (!auto_knee ("auto-interstaff-knee-gap", true))
- auto_knee ("auto-knee-gap", false);
-}
-
/*
Simplistic auto-knees; only consider vertical gap between two
adjacent chords.
`Forced' stem directions are ignored. If you don't want auto-knees,
- don't set, or unset autoKneeGap/autoInterstaffKneeGap.
+ don't set, or unset auto-knee-gap.
*/
-bool
-Beam::auto_knee (String gap_str, bool interstaff_b)
+void
+Beam::consider_auto_knees (Grob *me)
{
- bool knee_b = false;
- int knee_y = 0;
- SCM gap = get_elt_property (gap_str);
- Direction d = directional_element (this).get ();
-
- if (gh_number_p (gap))
+ SCM scm = me->get_grob_property ("auto-knee-gap");
+
+ if (gh_number_p (scm))
{
- int auto_gap_i = gh_scm2int (gap);
- for (int i=1; i < stem_count (); i++)
+ bool knee_b = false;
+ Real knee_y = 0;
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real gap = gh_scm2double (scm) / staff_space;
+
+ Direction d = Directional_element_interface::get (me);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ Grob *common = me->common_refpoint (stems[0], Y_AXIS);
+ for (int i=1; i < stems.size (); i++)
+ if (!Stem::invisible_b (stems[i]))
+ common = common->common_refpoint (stems[i], Y_AXIS);
+
+ int l = 0;
+ for (int i=1; i < stems.size (); i++)
{
- bool is_b = (bool)(calc_interstaff_dist (stem (i), this)
- - calc_interstaff_dist (stem (i-1), this));
- int l_y = (int)(stem (i-1)->head_positions()[d])
- + (int)calc_interstaff_dist (stem (i-1), this);
- int r_y = (int)(stem (i)->head_positions()[d])
- + (int)calc_interstaff_dist (stem (i), this);
- int gap_i = r_y - l_y;
-
- if ((abs (gap_i) >= auto_gap_i) && (!interstaff_b || is_b))
+ if (!Stem::invisible_b (stems[i-1]))
+ l = i - 1;
+ if (Stem::invisible_b (stems[l]))
+ continue;
+ if (Stem::invisible_b (stems[i]))
+ continue;
+
+ Real left = Stem::extremal_heads (stems[l])[d]
+ ->relative_coordinate (common, Y_AXIS);
+ Real right = Stem::extremal_heads (stems[i])[-d]
+ ->relative_coordinate (common, Y_AXIS);
+
+ Real dy = right - left;
+
+ if (abs (dy) >= gap)
{
- knee_y = (r_y + l_y) / 2;
+ knee_y = (right + left) / 2;
knee_b = true;
break;
}
}
- }
- if (knee_b)
- {
- for (int i=0; i < stem_count (); i++)
- {
- int y = (int)(stem (i)->head_positions()[d])
- + (int)calc_interstaff_dist (stem (i), this);
- directional_element (stem (i)).set (y < knee_y ? UP : DOWN);
- stem (i)->set_elt_property ("dir-forced", SCM_BOOL_T);
+
+ if (knee_b)
+ {
+ for (int i=0; i < stems.size (); i++)
+ {
+ if (Stem::invisible_b (stems[i]))
+ continue;
+ Item *s = stems[i];
+ Real y = Stem::extremal_heads (stems[i])[d]
+ ->relative_coordinate (common, Y_AXIS);
+
+ Directional_element_interface::set (s, y < knee_y ? UP : DOWN);
+ s->set_grob_property ("dir-forced", SCM_BOOL_T);
+ }
}
}
- return knee_b;
}
/*
scmify forced-fraction
*/
void
-Beam::set_stem_shorten ()
+Beam::set_stem_shorten (Grob*m)
{
- if (!visible_stem_count ())
- return;
+ Spanner*me = dynamic_cast<Spanner*> (m);
- Real forced_fraction = forced_stem_count () / visible_stem_count ();
+ Real forced_fraction = forced_stem_count (me) / visible_stem_count (me);
if (forced_fraction < 0.5)
return;
- int multiplicity = get_multiplicity ();
- // grace stems?
- SCM shorten = ly_eval_str ("beamed-stem-shorten");
+ int multiplicity = get_multiplicity (me);
- Array<Real> a;
- scm_to_array (shorten, &a);
- if (!a.size ())
+ SCM shorten = me->get_grob_property ("beamed-stem-shorten");
+ if (shorten == SCM_EOL)
return;
- Staff_symbol_referencer_interface st (this);
- Real staff_space = st.staff_space ();
- Real shorten_f = a[multiplicity <? (a.size () - 1)] * staff_space;
+ 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 this -- how to customise ? */
+ /* cute, but who invented me -- how to customise ? */
if (forced_fraction < 1)
shorten_f /= 2;
- for (int i=0; i < stem_count (); i++)
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ for (int i=0; i < stems.size (); i++)
{
- Stem* s = stem (i);
- if (s->invisible_b ())
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
continue;
- if (gh_number_p (s->get_elt_property ("shorten")))
- s->set_elt_property ("shorten", gh_double2scm (shorten_f));
+ if (gh_number_p (s->get_grob_property ("shorten")))
+ s->set_grob_property ("shorten", gh_double2scm (shorten_f));
}
}
/*
- Set elt properties height and y-position if not set.
- Adjust stem lengths to reach beam.
+ 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.
*/
-void
-Beam::after_line_breaking ()
+MAKE_SCHEME_CALLBACK (Beam, after_line_breaking, 1);
+SCM
+Beam::after_line_breaking (SCM smob)
{
- /* first, calculate y, dy */
- Real y, dy;
- calc_position_and_height (&y, &dy);
- if (visible_stem_count ())
- {
- if (suspect_slope_b (y, dy))
- dy = 0;
+ Grob * me = unsmob_grob (smob);
+
+ me->set_grob_property ("y", gh_double2scm (0));
+ me->set_grob_property ("dy", gh_double2scm (0));
- Real damped_dy = calc_slope_damping_f (dy);
- Real quantised_dy = quantise_dy_f (damped_dy);
+ /* 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 = gh_cdr (i))
+ gh_call1 (gh_car (i), smob);
- y += (dy - quantised_dy) / 2;
- dy = quantised_dy;
- }
- /*
- until here, we used only stem_info, which acts as if dir=up
- */
- y *= directional_element (this).get ();
- dy *= directional_element (this).get ();
+ // 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);
- Staff_symbol_referencer_interface st (this);
- Real half_space = st.staff_space () / 2;
+ return SCM_UNSPECIFIED;
+}
- /* check for user-override of dy */
- SCM s = remove_elt_property ("height-hs");
- if (gh_number_p (s))
- {
- dy = gh_scm2double (s) * half_space;
- }
- set_elt_property ("height", gh_double2scm (dy));
- /* check for user-override of y */
- s = remove_elt_property ("y-position-hs");
- if (gh_number_p (s))
+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 = gh_scm2double (s) * half_space;
+ y = first_ideal;
+ dy = 0;
}
else
- {
- /* we can modify y, so we should quantise y */
- Real y_shift = check_stem_length_f (y, dy);
- y += y_shift;
- y = quantise_y_f (y, dy, 0);
- set_stem_length (y, dy);
- y_shift = check_stem_length_f (y, dy);
+ {
+ Array<Offset> ideals;
+
+ // ugh -> use commonx
+ Real x0 = first_visible_stem (me)->relative_coordinate (0, X_AXIS);
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
- if (y_shift > half_space / 4)
+ for (int i=0; i < stems.size (); i++)
{
- y += y_shift;
-
- /*
- for significantly lengthened or shortened stems,
- request quanting the other way.
- */
- int quant_dir = 0;
- if (abs (y_shift) > half_space / 2)
- quant_dir = sign (y_shift) * directional_element (this).get ();
- y = quantise_y_f (y, dy, quant_dir);
+ 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_));
}
- }
- // UGH. Y is not in staff position unit?
- // Ik dacht datwe daar juist van weg wilden?
- set_stem_length (y, dy);
- set_elt_property ("y-position", gh_double2scm (y));
-}
-
-/*
- See Documentation/tex/fonts.doc
- */
-void
-Beam::calc_position_and_height (Real* y, Real* dy) const
-{
- *y = *dy = 0;
- if (visible_stem_count () <= 1)
- return;
+ Real dydx;
+ minimise_least_squares (&dydx, &y, ideals);
- Real first_ideal = first_visible_stem ()->calc_stem_info ().idealy_f_;
- if (first_ideal == last_visible_stem ()->calc_stem_info ().idealy_f_)
- {
- *dy = 0;
- *y = first_ideal;
- return;
- }
-
- Array<Offset> ideals;
- Real x0 = first_visible_stem ()->relative_coordinate (0, X_AXIS);
- for (int i=0; i < stem_count (); i++)
- {
- Stem* s = stem (i);
- if (s->invisible_b ())
- continue;
- ideals.push (Offset (s->relative_coordinate (0, X_AXIS) - x0,
- s->calc_stem_info ().idealy_f_));
+ Real dx = last_visible_stem (me)->relative_coordinate (0, X_AXIS) - x0;
+ dy = dydx * dx;
}
- Real dydx;
- minimise_least_squares (&dydx, y, ideals); // duh, takes references
- Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
- *dy = dydx * dx;
+ /* 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;
}
-bool
-Beam::suspect_slope_b (Real y, Real dy) const
+MAKE_SCHEME_CALLBACK (Beam, cancel_suspect_slope, 1);
+SCM
+Beam::cancel_suspect_slope (SCM smob)
{
- /* first, calculate y, dy */
- /*
- steep slope running against lengthened stem is suspect
- */
- Real first_ideal = first_visible_stem ()->calc_stem_info ().idealy_f_;
- Real last_ideal = last_visible_stem ()->calc_stem_info ().idealy_f_;
- Real lengthened = paper_l ()->get_var ("beam_lengthened");
- Real steep = paper_l ()->get_var ("beam_steep_slope");
-
- Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ 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"));
+
+ // 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;
- if (((y - first_ideal > lengthened) && (dydx > steep))
+ if (( (y - first_ideal > lengthened) && (dydx > steep))
|| ((y + dy - last_ideal > lengthened) && (dydx < -steep)))
{
- return true;
+ 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 false;
+ return SCM_UNSPECIFIED;
}
/*
damped = tanh (slope)
corresponds with some tables in [Wanske]
*/
-Real
-Beam::calc_slope_damping_f (Real dy) const
+MAKE_SCHEME_CALLBACK (Beam, slope_damping, 1);
+SCM
+Beam::slope_damping (SCM smob)
{
- SCM damp = get_elt_property ("damping"); // remove?
- int damping = 1; // ugh.
- if (gh_number_p (damp))
- damping = gh_scm2int (damp);
+ Grob *me = unsmob_grob (smob);
+
+ if (visible_stem_count (me) <= 1)
+ return SCM_UNSPECIFIED;
+
+ SCM s = me->get_grob_property ("damping");
+ int damping = gh_scm2int (s);
if (damping)
{
- Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS)
- - first_visible_stem ()->relative_coordinate (0, X_AXIS);
+ /* 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;
- return dydx * dx;
+
+ 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 = gh_cdr (s))
+ a.push (gh_scm2double (gh_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);
}
- return dy;
+
+ 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 (Stem* s, Real y, Real dy) const
+Beam::calc_stem_y_f (Grob*me,Item* s, Real y, Real dy)
{
- Real thick = gh_scm2double (get_elt_property ("beam-thickness"));
- int beam_multiplicity = get_multiplicity ();
- int stem_multiplicity = (s->flag_i () - 2) >? 0;
+ 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) ;
- Real interbeam_f = paper_l ()->interbeam_f (beam_multiplicity);
- Real x0 = first_visible_stem ()->relative_coordinate (0, X_AXIS);
- Real dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
+ // 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(this).get ();
- Direction sdir = directional_element (s).get ();
+ 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);
- Staff_symbol_referencer_interface me (s);
- Staff_symbol_referencer_interface last (last_visible_stem ());
+
// huh, why not for first visible?
- if (//(s != first_visible_stem ()) &&
- me.staff_symbol_l () != last.staff_symbol_l ())
- stem_y += directional_element (this).get ()
- * (beam_multiplicity - stem_multiplicity) * interbeam_f;
- }
+ 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 (Real y, Real dy) const
+Beam::check_stem_length_f (Grob*me,Real y, Real dy)
{
Real shorten = 0;
Real lengthen = 0;
- Direction dir = directional_element (this).get ();
-
- for (int i=0; i < stem_count (); i++)
+ Direction dir = Directional_element_interface::get (me);
+
+ Link_array<Item> stems=
+ Pointer_group_interface__extract_elements (me, (Item*)0, "stems");
+
+ for (int i=0; i < stems.size (); i++)
{
- Stem* s = stem (i);
- if (s->invisible_b ())
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
continue;
- Real stem_y = calc_stem_y_f (s, y, dy);
+ Real stem_y = calc_stem_y_f (me, s, y, dy);
stem_y *= dir;
- Stem_info info = s->calc_stem_info ();
+ Stem_info info = Stem::calc_stem_info (s);
// if (0 > info.maxy_f_ - stem_y)
shorten = shorten <? info.maxy_f_ - stem_y;
stem directions and length should set to relative to the chord's
position of the beam. */
void
-Beam::set_stem_length (Real y, Real dy)
+Beam::set_stem_lengths (Grob *me)
{
- Staff_symbol_referencer_interface st (this);
- Real half_space = st.staff_space ()/2;
- for (int i=0; i < stem_count (); i++)
+ 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_elements (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++)
{
- Stem* s = stem (i);
- if (s->invisible_b ())
+ Item* s = stems[i];
+ if (Stem::invisible_b (s))
continue;
- Real stem_y = calc_stem_y_f (s, y, dy);
+ 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 */
- s->set_stemend ((stem_y + calc_interstaff_dist (s, this)) / half_space);
+ Real id = me->relative_coordinate (common, Y_AXIS)
+ - stems[i]->relative_coordinate (common, Y_AXIS);
+ Stem::set_stemend (s, (stem_y + id) / half_space);
}
}
-/*
- [Ross] (simplification of)
- Set dy complying with:
- - zero
- - thick / 2 + staffline_f / 2
- - thick + staffline_f
- + n * staff_space
-*/
-Real
-Beam::quantise_dy_f (Real dy) const
-{
- SCM quants = ly_eval_str ("beam-height-quants");
-
- Array<Real> a;
- scm_to_array (quants, &a);
- if (a.size () <= 1)
- return dy;
-
- Staff_symbol_referencer_interface st (this);
- Real staff_space = st.staff_space ();
-
- Interval iv = quantise_iv (a, abs (dy)/staff_space) * staff_space;
- Real q = (abs (dy) - iv[SMALLER] <= iv[BIGGER] - abs (dy))
- ? iv[SMALLER]
- : iv[BIGGER];
-
- return q * sign (dy);
-}
-
/*
Prevent interference from stafflines and beams.
- See Documentation/tex/fonts.doc
- We only need to quantise the (left) y-position of the beam,
+ 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 (Real y, Real dy, int quant_dir)
+Beam::quantise_y_f (Grob*me,Real y, Real dy, int quant_dir)
{
- int multiplicity = get_multiplicity ();
- Staff_symbol_referencer_interface st (this);
- Real staff_space = st.staff_space ();
- SCM quants = scm_eval (gh_list (
- ly_symbol2scm ("beam-vertical-position-quants"),
- gh_int2scm (multiplicity),
- gh_double2scm (dy/staff_space),
- SCM_UNDEFINED));
+ int multiplicity = get_multiplicity (me);
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real thick = me->paper_l ()->get_var ("stafflinethickness");
+
+
+ SCM proc = me->get_grob_property ("vertical-position-quant-function");
+ SCM quants = scm_apply (proc,
+ me->self_scm (),
+ gh_list (gh_int2scm (multiplicity),
+ gh_double2scm (dy/staff_space),
+ gh_double2scm (thick/staff_space),
+ SCM_EOL, SCM_UNDEFINED));
+
Array<Real> a;
- scm_to_array (quants, &a);
+
+ for (; gh_pair_p (quants); quants = gh_cdr (quants))
+ a.push (gh_scm2double (gh_car (quants)));
+
if (a.size () <= 1)
return y;
- Real up_y = directional_element (this).get () * y;
+ 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];
+ q = iv[ (Direction)quant_dir];
- return q * directional_element (this).get ();
+ return q * Directional_element_interface::get (me);
}
void
-Beam::set_beaming (Beaming_info_list *beaming)
+Beam::set_beaming (Grob*me,Beaming_info_list *beaming)
{
+ Link_array<Grob> stems=
+ Pointer_group_interface__extract_elements (me, (Grob*)0, "stems");
+
Direction d = LEFT;
- for (int i=0; i < stem_count (); i++)
+ for (int i=0; i < stems.size (); i++)
{
do
{
- if (stem (i)->beam_count (d) == 0)
- stem (i)->set_beaming ( beaming->infos_.elem (i).beams_i_drul_[d],d);
+ /* Don't overwrite user override (?) */
+ if (Stem::beam_count (stems[i], d) == 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.
- BURP
- clean me up.
+ FIXME: clean me up.
*/
Molecule
-Beam::stem_beams (Stem *here, Stem *next, Stem *prev) const
+Beam::stem_beams (Grob*me,Item *here, Item *next, Item *prev,
+ Real dy, Real dydx
+ )
{
- 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))))
+ // ugh -> use commonx
+ if ((next && ! (next->relative_coordinate (0, X_AXIS) > here->relative_coordinate (0, X_AXIS))) ||
+ (prev && ! (prev->relative_coordinate (0, X_AXIS) < here->relative_coordinate (0, X_AXIS))))
programming_error ("Beams are not left-to-right");
- Real staffline_f = paper_l ()->get_var ("stafflinethickness");
- int multiplicity = get_multiplicity ();
-
+ int multiplicity = get_multiplicity (me);
- Real interbeam_f = paper_l ()->interbeam_f (multiplicity);
- Real thick = gh_scm2double (get_elt_property ("beam-thickness"));
+ SCM space_proc = me->get_grob_property ("space-function");
+ SCM space = gh_call1 (space_proc, gh_int2scm (multiplicity));
+ Real thick = gh_scm2double (me->get_grob_property ("thickness")) ;
+ Real interbeam_f = gh_scm2double (space) ;
+
Real bdy = interbeam_f;
- Real stemdx = staffline_f;
-
- Real dx = visible_stem_count () ?
- last_visible_stem ()->relative_coordinate (0, X_AXIS) - first_visible_stem ()->relative_coordinate (0, X_AXIS)
+
+#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;
- Real dy = gh_scm2double (get_elt_property ("height"));
- Real dydx = dy && dx ? dy/dx : 0;
-
+#endif
+
Molecule leftbeams;
Molecule rightbeams;
- // UGH
Real nw_f;
- if (!here->first_head ())
+ if (!Stem::first_head (here))
nw_f = 0;
- else if (here->type_i ()== 1)
- nw_f = paper_l ()->get_var ("wholewidth");
- else if (here->type_i () == 2)
- nw_f = paper_l ()->get_var ("notewidth") * 0.8;
- else
- nw_f = paper_l ()->get_var ("quartwidth");
+ 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 (this).get ();
+ 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 = here->beam_count (LEFT) - prev->beam_count (RIGHT);
- int lwholebeams= here->beam_count (LEFT) <? prev->beam_count (RIGHT) ;
+ int lhalfs= lhalfs = Stem::beam_count (here,LEFT) - Stem::beam_count (prev,RIGHT);
+ int lwholebeams= Stem::beam_count (here,LEFT) <? Stem::beam_count (prev,RIGHT) ;
/*
Half beam should be one note-width,
but let's make sure two half-beams never touch
*/
- Real w = here->relative_coordinate (0, X_AXIS) - prev->relative_coordinate (0, X_AXIS);
+
+ // FIXME: TODO (check) stem width / sloped beams
+ Real w = here->relative_coordinate (0, X_AXIS)
+ - prev->relative_coordinate (0, X_AXIS);
+ Real stem_w = gh_scm2double (prev->get_grob_property ("thickness"))
+ // URG
+ * me->paper_l ()->get_var ("stafflinethickness");
+
w = w/2 <? nw_f;
Molecule a;
if (lhalfs) // generates warnings if not
- a = lookup_l ()->beam (dydx, w, thick);
+ 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);
if (next)
{
- int rhalfs = here->beam_count (RIGHT) - next->beam_count (LEFT);
- int rwholebeams= here->beam_count (RIGHT) <? next->beam_count (LEFT) ;
+ int rhalfs = Stem::beam_count (here,RIGHT)
+ - Stem::beam_count (next,LEFT);
+ int rwholebeams= Stem::beam_count (here,RIGHT)
+ <? Stem::beam_count (next,LEFT) ;
+
+ Real w = next->relative_coordinate (0, X_AXIS)
+ - here->relative_coordinate (0, X_AXIS);
+
+ Real stem_w = gh_scm2double (next->get_grob_property ("thickness"))
+ // URG
+ * me->paper_l ()->get_var ("stafflinethickness");
- Real w = next->relative_coordinate (0, X_AXIS) - here->relative_coordinate (0, X_AXIS);
- Molecule a = lookup_l ()->beam (dydx, w + stemdx, thick);
- a.translate_axis( - stemdx/2, X_AXIS);
+ Molecule a = Lookup::beam (dydx, w + stem_w, thick);
+ a.translate_axis (- stem_w/2, X_AXIS);
int j = 0;
Real gap_f = 0;
-
- SCM gap = get_elt_property ("beam-gap");
+
+ SCM gap = me->get_grob_property ("gap");
if (gh_number_p (gap))
{
- int gap_i = gh_scm2int ( (gap));
+ int gap_i = gh_scm2int ((gap));
int nogap = rwholebeams - gap_i;
for (; j < nogap; j++)
b.translate_axis (-dir * bdy * j, Y_AXIS);
rightbeams.add_molecule (b);
}
- // TODO: notehead widths differ for different types
- gap_f = nw_f / 2;
+ if (Stem::invisible_b (here))
+ gap_f = nw_f;
+ else
+ gap_f = nw_f / 2;
w -= 2 * gap_f;
- a = lookup_l ()->beam (dydx, w + stemdx, thick);
+ a = Lookup::beam (dydx, w + stem_w, thick);
}
for (; j < rwholebeams; j++)
{
Molecule b (a);
- b.translate (Offset (here->invisible_b () ? 0 : gap_f, -dir * bdy * j));
+ Real tx = 0;
+ if (Stem::invisible_b (here))
+ // ugh, see chord-tremolo.ly
+ tx = (-dir + 1) / 2 * nw_f * 1.5 + gap_f/4;
+ else
+ tx = gap_f;
+ b.translate (Offset (tx, -dir * bdy * j));
rightbeams.add_molecule (b);
}
w = w/2 <? nw_f;
if (rhalfs)
- a = lookup_l ()->beam (dydx, w, thick);
+ a = Lookup::beam (dydx, w, thick);
for (; j < rwholebeams + rhalfs; j++)
{
return leftbeams;
}
-
-Molecule
-Beam::do_brew_molecule () const
+MAKE_SCHEME_CALLBACK (Beam,brew_molecule,1);
+SCM
+Beam::brew_molecule (SCM smob)
{
+ Grob * me =unsmob_grob (smob);
+
Molecule mol;
- if (!stem_count ())
- return mol;
+ if (!gh_pair_p (me->get_grob_property ("stems")))
+ return SCM_EOL;
Real x0,dx;
- if (visible_stem_count ())
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ if (visible_stem_count (me))
{
- x0 = first_visible_stem ()->relative_coordinate (0, X_AXIS);
- dx = last_visible_stem ()->relative_coordinate (0, X_AXIS) - x0;
+ // 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 = stem (0)->relative_coordinate (0, X_AXIS);
- dx = stem_top ()->relative_coordinate (0, X_AXIS) - x0;
+ 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_scm2double (get_elt_property ("height"));
+ Real dy = gh_number_p (dy_s) ? gh_scm2double (dy_s) : 0.0;
Real dydx = dy && dx ? dy/dx : 0;
- Real y = gh_scm2double (get_elt_property ("y-position"));
- for (int j=0; j <stem_count (); j++)
+ Real y = gh_number_p (y_s) ? gh_scm2double (y_s) : 0.0;
+
+
+ for (int j=0; j <stems.size (); j++)
{
- Stem *i = stem (j);
- Stem * prev = (j > 0)? stem (j-1) : 0;
- Stem * next = (j < stem_count ()-1) ? stem (j+1) :0;
+ 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 (i, next, prev);
+ 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
- - get_bound (LEFT)->relative_coordinate (0, X_AXIS), X_AXIS);
+ - dynamic_cast<Spanner*> (me)->get_bound (LEFT)->relative_coordinate (0, X_AXIS), X_AXIS);
- return mol;
+ return mol.smobbed_copy ();
}
int
-Beam::forced_stem_count () const
+Beam::forced_stem_count (Grob*me)
{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
int f = 0;
- for (int i=0; i < stem_count (); i++)
+ for (int i=0; i < stems.size (); i++)
{
- Stem *s = stem (i);
+ Item *s = stems[i];
- if (s->invisible_b ())
+ if (Stem::invisible_b (s))
continue;
- if (((int)s->chord_start_f ())
- && (s->get_direction () != s->get_default_dir ()))
+ if (( (int)Stem::chord_start_f (s))
+ && (Stem::get_direction (s) != Stem::get_default_dir (s)))
f++;
}
return f;
-/*
- TODO: Fix this class. This is wildly inefficient.
- And it sux. Yet another array/list 'interface'.
- */
-Stem *
-Beam::stem (int i) const
-{
- return Group_interface__extract_elements ((Beam*) this, (Stem*) 0, "stems")[i];
-}
-
-int
-Beam::stem_count () const
-{
- Group_interface gi (this, "stems");
- return gi.count ();
-}
-
-Stem*
-Beam::stem_top () const
-{
- SCM s = get_elt_property ("stems");
-
- return gh_pair_p (s) ? dynamic_cast<Stem*> (unsmob_element (gh_car (s))) : 0;
-
- //Group_interface__extract_elements ((Beam*) this, (Stem*) 0, "stems")[stem_count () - 1];
-}
-/* burp */
+/* TODO:
+ use filter and standard list functions.
+ */
int
-Beam::visible_stem_count () const
+Beam::visible_stem_count (Grob*me)
{
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
int c = 0;
- for (int i = 0; i < stem_count (); i++)
+ for (int i = stems.size (); i--;)
{
- if (!stem (i)->invisible_b ())
+ if (!Stem::invisible_b (stems[i]))
c++;
}
return c;
}
-Stem*
-Beam::first_visible_stem () const
+Item*
+Beam::first_visible_stem (Grob*me)
{
- for (int i = 0; i < stem_count (); i++)
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+
+ for (int i = 0; i < stems.size (); i++)
{
- Stem* s = stem (i);
- if (!s->invisible_b ())
- return s;
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
}
return 0;
}
-Stem*
-Beam::last_visible_stem () const
+Item*
+Beam::last_visible_stem (Grob*me)
{
- for (int i = stem_count (); i > 0; i--)
+ Link_array<Item>stems =
+ Pointer_group_interface__extract_elements (me, (Item*) 0, "stems");
+ for (int i = stems.size (); i--;)
{
- Stem* s = stem (i - 1);
- if (!s->invisible_b ())
- return s;
+ if (!Stem::invisible_b (stems[i]))
+ return stems[i];
}
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 / blobdiff