source file of the GNU LilyPond music typesetter
- (c) 1996, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1996--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
TODO: This is way too hairy
+
+ TODO: fix naming.
+
+ Stem-end, chord-start, etc. is all confusing naming.
*/
+#include <math.h> // rint
+
+#include "lookup.hh"
+#include "directional-element-interface.hh"
+#include "note-head.hh"
#include "stem.hh"
-#include "debug.hh"
+#include "warn.hh"
#include "paper-def.hh"
-#include "note-head.hh"
-#include "lookup.hh"
+#include "rhythmic-head.hh"
+#include "font-interface.hh"
#include "molecule.hh"
#include "paper-column.hh"
#include "misc.hh"
#include "beam.hh"
#include "rest.hh"
+#include "group-interface.hh"
+#include "staff-symbol-referencer.hh"
+#include "spanner.hh"
+#include "side-position-interface.hh"
+#include "dot-column.hh"
void
-Stem::set_direction (Direction d)
+Stem::set_beaming (Grob*me, int beam_count, Direction d)
{
- if (!dir_)
- warning (_ ("stem direction set already!"));
-
- dir_ = d;
+ SCM pair = me->get_grob_property ("beaming");
+
+ if (!gh_pair_p (pair))
+ {
+ pair = gh_cons (SCM_EOL, SCM_EOL);
+ me->set_grob_property ("beaming", pair);
+ }
- /*
- todo
- */
+ SCM l = index_get_cell (pair, d);
+ for( int i = 0; i< beam_count; i++)
+ {
+ l = gh_cons (gh_int2scm (i), l);
+ }
+ index_set_cell (pair, d, l);
}
-Stem::Stem ()
+
+Interval
+Stem::head_positions (Grob*me)
{
- beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1;
- yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
- flag_i_ = 2;
- dir_ = CENTER;
- beam_l_ = 0;
+ if (!head_count (me))
+ {
+ Interval iv;
+ return iv;
+ }
+
+ Drul_array<Grob*> e (extremal_heads (me));
+
+ return Interval (Staff_symbol_referencer::get_position (e[DOWN]),
+ Staff_symbol_referencer::get_position (e[UP]));
}
-Interval_t<int>
-Stem::head_positions () const
+
+Real
+Stem::chord_start_y (Grob*me)
{
- /*
- Mysterious FreeBSD fix by John Galbraith. Somehow, the empty intervals
- trigger FP exceptions on FreeBSD. Fix: do not return infinity
+ return head_positions (me)[get_direction (me)]
+ * Staff_symbol_referencer::staff_space (me)/2.0;
+}
- */
- if (!head_l_arr_.size ())
+Real
+Stem::stem_end_position (Grob*me)
+{
+ SCM p =me->get_grob_property ("stem-end-position");
+ Real pos;
+ if (!gh_number_p (p))
{
- return Interval_t<int> (100,-100);
+ pos = get_default_stem_end_position (me);
+ me->set_grob_property ("stem-end-position", gh_double2scm (pos));
}
+ else
+ pos = gh_scm2double (p);
+
+ return pos;
+}
+
+Direction
+Stem::get_direction (Grob*me)
+{
+ Direction d = Directional_element_interface::get (me);
- Interval_t<int> r;
- for (int i =0; i < head_l_arr_.size (); i++)
+ if (!d)
{
- int p = head_l_arr_[i]->position_i ();
- r[BIGGER] = r[BIGGER] >? p;
- r[SMALLER] = r[SMALLER] <? p;
+ d = get_default_dir (me);
+ // urg, AAARGH!
+ Directional_element_interface::set (me, d);
}
- return r;
+ return d ;
}
+
void
-Stem::do_print () const
+Stem::set_stemend (Grob*me, Real se)
{
-#ifndef NPRINT
- DOUT << "flag "<< flag_i_;
- if (beam_l_)
- DOUT << "beamed";
-#endif
+ // todo: margins
+ Direction d= get_direction (me);
+
+ if (d && d * head_positions (me)[get_direction (me)] >= se*d)
+ me->warning (_ ("Weird stem size; check for narrow beams"));
+
+ me->set_grob_property ("stem-end-position", gh_double2scm (se));
}
-Real
-Stem::stem_length_f () const
+
+/*
+ Note head that determines hshift for upstems
+
+ WARNING: triggers direction
+*/
+Grob*
+Stem::support_head (Grob*me)
{
- return yextent_drul_[UP]-yextent_drul_[DOWN] ;
+ SCM h = me->get_grob_property ("support-head");
+ Grob * nh = unsmob_grob (h);
+ if (nh)
+ return nh;
+ else if (head_count (me) == 1)
+ {
+ /*
+ UGH.
+ */
+
+ return unsmob_grob (ly_car (me->get_grob_property ("note-heads")));
+ }
+ else
+ return first_head (me);
}
-Real
-Stem::stem_begin_f () const
+
+int
+Stem::head_count (Grob*me)
{
- return yextent_drul_[Direction(-dir_)];
+ return Pointer_group_interface::count (me, "note-heads");
}
-Real
-Stem::chord_start_f () const
+/*
+ The note head which forms one end of the stem.
+
+ WARNING: triggers direction
+*/
+Grob*
+Stem::first_head (Grob*me)
{
- return head_positions()[dir_] * staff_line_leading_f ()/2.0;
+ Direction d = get_direction (me);
+ if (!d)
+ return 0;
+ return extremal_heads (me)[-d];
}
-Real
-Stem::stem_end_f () const
+/*
+ The note head opposite to the first head.
+ */
+Grob*
+Stem::last_head (Grob*me)
{
- return yextent_drul_[dir_];
+ Direction d = get_direction (me);
+ if (!d)
+ return 0;
+ return extremal_heads (me)[d];
}
-void
-Stem::set_stemend (Real se)
+/*
+ START is part where stem reaches `last' head.
+ */
+Drul_array<Grob*>
+Stem::extremal_heads (Grob*me)
{
- // todo: margins
- if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
- warning (_ ("Weird stem size; check for narrow beams"));
-
+ const int inf = 1000000;
+ Drul_array<int> extpos;
+ extpos[DOWN] = inf;
+ extpos[UP] = -inf;
+
+ Drul_array<Grob *> exthead;
+ exthead[LEFT] = exthead[RIGHT] =0;
- yextent_drul_[dir_] = se;
- yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
+ for (SCM s = me->get_grob_property ("note-heads"); gh_pair_p (s); s = ly_cdr (s))
+ {
+ Grob * n = unsmob_grob (ly_car (s));
+
+
+ int p = int (Staff_symbol_referencer::get_position (n));
+
+ Direction d = LEFT;
+ do {
+ if (d* p > d* extpos[d])
+ {
+ exthead[d] = n;
+ extpos[d] = p;
+ }
+ } while (flip (&d) != DOWN);
+ }
+
+ return exthead;
}
-int
-Stem::type_i () const
+static int
+icmp (int const &a, int const &b)
{
- return head_l_arr_[0]->balltype_i_;
+ return a-b;
}
-void
-Stem::add_head (Rhythmic_head *n)
+Array<int>
+Stem::note_head_positions (Grob *me)
{
- n->stem_l_ = this;
- n->add_dependency (this); // ?
- if (Note_head *nh = dynamic_cast<Note_head *> (n))
- {
- head_l_arr_.push (nh);
- }
- else if (Rest *r = dynamic_cast<Rest *> (n))
+ Array<int> ps ;
+ for (SCM s = me->get_grob_property ("note-heads"); gh_pair_p (s); s = ly_cdr (s))
{
- rest_l_arr_.push (r);
+ Grob * n = unsmob_grob (ly_car (s));
+ int p = int (Staff_symbol_referencer::get_position (n));
+
+ ps.push (p);
}
+
+ ps.sort (icmp);
+ return ps;
}
-bool
-Stem::invisible_b () const
+
+void
+Stem::add_head (Grob*me, Grob *n)
{
- return (!head_l_arr_.size () ||
- head_l_arr_[0]->balltype_i_ <= 0);
+ n->set_grob_property ("stem", me->self_scm ());
+ n->add_dependency (me);
+
+ if (Note_head::has_interface (n))
+ {
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-heads"), n);
+ }
}
-int
-Stem::get_center_distance (Direction d) const
+bool
+Stem::invisible_b (Grob*me)
{
- int staff_center = 0;
- int distance = d*(head_positions()[d] - staff_center);
- return distance >? 0;
+ return ! (head_count (me)
+ && gh_scm2int (me->get_grob_property ("duration-log")) >= 1);
}
Direction
-Stem::get_default_dir () const
+Stem::get_default_dir (Grob*me)
{
- int du = get_center_distance (UP);
- int dd = get_center_distance (DOWN);
-
- if (sign (dd - du))
- return Direction (sign (dd -du));
+ int staff_center = 0;
+ Interval hp = head_positions (me);
+ if (hp.empty_b())
+ {
+ return CENTER;
+ }
+
+ int udistance = (int) (UP * hp[UP] - staff_center);
+ int ddistance = (int) (DOWN* hp[DOWN] - staff_center);
+
+ if (sign (ddistance - udistance))
+ return Direction (sign (ddistance -udistance));
- return Direction (int(paper_l ()->get_var ("stem_default_neutral_direction")));
+ return to_dir (me->get_grob_property ("neutral-direction"));
}
-Direction
-Stem::get_dir () const
+Real
+Stem::get_default_stem_end_position (Grob*me)
{
- return dir_;
-}
-
+ /* Tab notation feature: make stem end extend out of staff. */
+ SCM up_to_staff = me->get_grob_property ("up-to-staff");
+ if (to_boolean (up_to_staff))
+ {
+ int line_count = Staff_symbol_referencer::line_count (me);
+ Direction dir = get_direction (me);
+ return dir * (line_count + 3.5);
+ }
+
+ bool grace_b = to_boolean (me->get_grob_property ("grace"));
+ SCM s;
+ Array<Real> a;
-void
-Stem::set_default_stemlen ()
-{
- Real length_f = 0.;
- SCM scm_len = get_elt_property(length_scm_sym);
- if (scm_len != SCM_BOOL_F)
+ Real length_f = 3.5;
+ SCM scm_len = me->get_grob_property ("length");
+ if (gh_number_p (scm_len))
{
- length_f = gh_scm2double (SCM_CDR(scm_len));
+ length_f = gh_scm2double (scm_len);
}
else
- length_f = paper_l ()->get_var ("stem_length0");
-
- bool grace_b = get_elt_property (grace_scm_sym) != SCM_BOOL_F;
- String type_str = grace_b ? "grace_" : "";
+ {
+ s = me->get_grob_property ("lengths");
+ if (gh_pair_p (s))
+ {
+ length_f = 2* gh_scm2double (robust_list_ref (duration_log(me) -2, s));
+ }
+ }
- Real shorten_f = paper_l ()->get_var (type_str + "forced_stem_shorten0");
+ Real shorten_f = 0.0;
+
+ SCM sshorten = me->get_grob_property ("stem-shorten");
+ if (gh_pair_p (sshorten))
+ {
+ shorten_f = 2* gh_scm2double (robust_list_ref ((duration_log (me) - 2) >? 0, sshorten));
+ }
- if (!dir_)
- dir_ = get_default_dir ();
+ /* On boundary: shorten only half */
+ if (abs (chord_start_y (me)) == 0.5)
+ shorten_f *= 0.5;
- /*
- stems in unnatural (forced) direction should be shortened,
- according to [Roush & Gourlay]
+ /* URGURGURG
+ 'set-default-stemlen' sets direction too
*/
- if (((int)chord_start_f ())
- && (dir_ != get_default_dir ()))
+ Direction dir = get_direction (me);
+ if (!dir)
+ {
+ dir = get_default_dir (me);
+ Directional_element_interface::set (me, dir);
+ }
+
+ /* stems in unnatural (forced) direction should be shortened,
+ according to [Roush & Gourlay] */
+ if (chord_start_y (me)
+ && (get_direction (me) != get_default_dir (me)))
length_f -= shorten_f;
- if (flag_i_ >= 5)
- length_f += 2.0;
- if (flag_i_ >= 6)
- length_f += 1.0;
-
- set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + length_f:
- head_positions()[SMALLER] - length_f);
+ Interval hp = head_positions (me);
+ Real st = hp[dir] + dir * length_f;
+
+
+ /*
+ TODO: change name to extend-stems to staff/center/'()
+ */
+ bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));
+ if (!grace_b && !no_extend_b && dir * st < 0) // junkme?
+ st = 0.0;
+
+ /*
+ Make a little room if we have a upflag and there is a dot.
+ previous approach was to lengthen the stem. This is not
+ good typesetting practice.
+
+ */
+ if (!get_beam (me) && dir == UP
+ && duration_log (me) > 2)
+ {
+ Grob * closest_to_flag = extremal_heads (me)[dir];
+ Grob * dots = closest_to_flag
+ ? Rhythmic_head::get_dots (closest_to_flag ) : 0;
+
+ if (dots)
+ {
+ Real dp = Staff_symbol_referencer::get_position (dots);
+ Real flagy = flag (me).extent (Y_AXIS)[-dir] * 2
+ / Staff_symbol_referencer::staff_space (me);
+
+ /*
+ Very gory: add myself to the X-support of the parent,
+ which should be a dot-column.
+ */
+ if (dir * (st + flagy - dp) < 0.5)
+ {
+ Grob *par = dots->get_parent (X_AXIS);
+
+ if (Dot_column::has_interface (par))
+ {
+ Side_position_interface::add_support (par, me);
+
+ /*
+ TODO: apply some better logic here. The flag is
+ curved inwards, so this will typically be too
+ much.
+ */
+ }
+ }
+ }
+ }
+
- if (!grace_b && (dir_ * stem_end_f () < 0))
- set_stemend (0);
+ return st;
}
-//xxx
-void
-Stem::set_default_extents ()
-{
- if (!stem_length_f ())
- set_default_stemlen ();
+
+/*
+
+ the log of the duration (Number of hooks on the flag minus two)
+ */
+int
+Stem::duration_log (Grob*me)
+{
+ SCM s = me->get_grob_property ("duration-log");
+ return (gh_number_p (s)) ? gh_scm2int (s) : 2;
}
void
-Stem::set_noteheads ()
+Stem::position_noteheads (Grob*me)
{
- if (!head_l_arr_.size ())
+ if (!head_count (me))
return;
- head_l_arr_.sort (Note_head::compare);
- if (dir_ < 0)
- head_l_arr_.reverse ();
-
- Note_head * beginhead = head_l_arr_[0];
- beginhead->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
- if (beginhead != head_l_arr_.top ())
- head_l_arr_.top ()->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
- int parity=1;
- int lastpos = beginhead->position_i ();
- for (int i=1; i < head_l_arr_.size (); i ++)
+ Link_array<Grob> heads =
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-heads");
+
+ heads.sort (compare_position);
+ Direction dir =get_direction (me);
+
+ if (dir < 0)
+ heads.reverse ();
+
+
+ bool invisible = invisible_b (me);
+ Real thick = gh_scm2double (me->get_grob_property ("thickness"))
+ * me->get_paper ()->get_var ("linethickness");
+
+
+ Grob *hed = support_head (me);
+ Real w = Note_head::head_extent (hed,X_AXIS)[dir];
+ for (int i=0; i < heads.size (); i++)
+ {
+ heads[i]->translate_axis (w - Note_head::head_extent (heads[i],X_AXIS)[dir],
+ X_AXIS);
+ }
+
+ bool parity= true; // todo: make me settable.
+ int lastpos = int (Staff_symbol_referencer::get_position (heads[0]));
+ for (int i=1; i < heads.size (); i ++)
{
- int dy =abs (lastpos- head_l_arr_[i]->position_i ());
+ Real p = Staff_symbol_referencer::get_position (heads[i]);
+ int dy =abs (lastpos- (int)p);
if (dy <= 1)
{
if (parity)
- head_l_arr_[i]->flip_around_stem (dir_);
+ {
+ Real l = Note_head::head_extent (heads[i], X_AXIS).length ();
+
+ Direction d = get_direction (me);
+ /* reversed head should be shifted l-thickness, but this looks
+ too crowded, so we only shift l-0.5*thickness.
+ Notice that this leads to assymetry: Normal heads overlap
+ the stem 100% whereas reversed heads only overlaps the stem
+ 50% */
+ #define magic 0.5
+ heads[i]->translate_axis ((l-thick*magic) * d, X_AXIS);
+
+ if (invisible_b(me))
+ heads[i]->translate_axis (-thick*(2-magic) * d , X_AXIS);
+
+
+ /* TODO:
+
+ For some cases we should kern some more: when the
+ distance between the next or prev note is too large, we'd
+ get large white gaps, eg.
+
+ |
+ X|
+ |X <- kern this.
+ |
+ X
+
+ */
+ }
parity = !parity;
}
else
- parity = 1;
- lastpos = head_l_arr_[i]->position_i ();
+ parity = true;
+
+ lastpos = int (p);
}
}
-void
-Stem::do_pre_processing ()
+MAKE_SCHEME_CALLBACK (Stem,before_line_breaking,1);
+SCM
+Stem::before_line_breaking (SCM smob)
{
- if (yextent_drul_[DOWN]== yextent_drul_[UP])
- set_default_extents ();
- set_noteheads ();
+ Grob*me = unsmob_grob (smob);
+
- if (invisible_b ())
+ /*
+ Do the calculations for visible stems, but also for invisible stems
+ with note heads (i.e. half notes.)
+ */
+ if (head_count (me))
+ {
+ stem_end_position (me); // ugh. Trigger direction calc.
+ position_noteheads (me);
+ }
+ else
{
- set_elt_property (transparent_scm_sym, SCM_BOOL_T);
+ me->set_grob_property ("molecule-callback", SCM_EOL);
}
- set_empty (invisible_b (), X_AXIS, Y_AXIS);
- set_spacing_hints ();
+
+ return SCM_UNSPECIFIED;
}
+/*
+ ugh.
+ When in a beam with tuplet brackets, brew_mol is called early,
+ caching a wrong value.
+ */
+MAKE_SCHEME_CALLBACK (Stem, height, 2);
+SCM
+Stem::height (SCM smob, SCM ax)
+{
+ Axis a = (Axis)gh_scm2int (ax);
+ Grob * me = unsmob_grob (smob);
+ assert (a == Y_AXIS);
+
+ SCM mol = me->get_uncached_molecule ();
+ Interval iv;
+ if (mol != SCM_EOL)
+ iv = unsmob_molecule (mol)->extent (a);
+ if (Grob *b =get_beam (me))
+ {
+ Direction d = get_direction (me);
+ iv[d] += d * Beam::get_thickness (b) /2.0 ;
+ }
+ return ly_interval2scm (iv);
+}
-/**
- set stem directions for hinting the optical spacing correction.
-
- Modifies DIR_LIST property of the Stem's Score_column
- TODO: more advanced: supply height of noteheads as well, for more advanced spacing possibilities
- */
-void
-Stem::set_spacing_hints ()
+Molecule
+Stem::flag (Grob*me)
{
- if (!invisible_b ())
+ /* TODO: maybe property stroke-style should take different values,
+ e.g. "" (i.e. no stroke), "single" and "double" (currently, it's
+ '() or "grace"). */
+ String flag_style;
+
+ SCM flag_style_scm = me->get_grob_property ("flag-style");
+ if (gh_symbol_p (flag_style_scm))
{
- SCM scmdir = gh_int2scm (dir_);
- SCM dirlist = column_l ()->get_elt_property (dir_list_scm_sym);
- if (dirlist == SCM_BOOL_F)
- dirlist = SCM_EOL;
- else
- dirlist = SCM_CDR (dirlist);
+ flag_style = ly_symbol2string (flag_style_scm);
+ }
- if (scm_sloppy_memq (scmdir, dirlist) == SCM_EOL)
- {
- dirlist = gh_cons (scmdir, dirlist);
- column_l ()->set_elt_property (dir_list_scm_sym, dirlist);
+ if (flag_style == "no-flag")
+ {
+ return Molecule ();
+ }
+
+ bool adjust = to_boolean (me->get_grob_property ("adjust-if-on-staffline"));
+
+ String staffline_offs;
+ if (String::compare (flag_style, "mensural") == 0)
+ /* Mensural notation: For notes on staff lines, use different
+ flags than for notes between staff lines. The idea is that
+ flags are always vertically aligned with the staff lines,
+ regardless if the note head is on a staff line or between two
+ staff lines. In other words, the inner end of a flag always
+ touches a staff line.
+ */
+ {
+ if (adjust)
+ {
+ /* Urrgh! We have to detect wether this stem ends on a staff
+ line or between two staff lines. But we can not call
+ stem_end_position(me) or get_default_stem_end_position(me),
+ since this encounters the flag and hence results in an
+ infinite recursion. However, in pure mensural notation,
+ there are no multiple note heads attached to a single stem,
+ neither is there usually need for using the stem_shorten
+ property (except for 32th and 64th notes, but that is not a
+ problem since the stem length in this case is augmented by
+ an integral multiple of staff_space). Hence, it should be
+ sufficient to just take the first note head, assume it's
+ the only one, look if it's on a staff line, and select the
+ flag's shape accordingly. In the worst case, the shape
+ looks slightly misplaced, but that will usually be the
+ programmer's fault (e.g. when trying to attach multiple
+ note heads to a single stem in mensural notation). */
+
+ /*
+ perhaps the detection whether this correction is needed should
+ happen in a different place to avoid the recursion.
+
+ --hwn.
+ */
+ int p = (int)rint (Staff_symbol_referencer::get_position (first_head (me)));
+ staffline_offs = Staff_symbol_referencer::on_staffline (me, p) ?
+ "1" : "0";
+ }
+ else
+ {
+ staffline_offs = "2";
}
}
-}
+ else
+ {
+ staffline_offs = "";
+ }
-Molecule
-Stem::flag () const
-{
- String style;
- SCM st = get_elt_property (style_scm_sym);
- if ( st != SCM_BOOL_F)
+ char dir = (get_direction (me) == UP) ? 'u' : 'd';
+ String font_char =
+ flag_style + to_string (dir) + staffline_offs + to_string (duration_log (me));
+ Font_metric *fm = Font_interface::get_default_font (me);
+ Molecule flag = fm->find_by_name ("flags-" + font_char);
+ if (flag.empty_b ())
{
- st = SCM_CDR(st);
- style = ly_scm2string (st);
+ me->warning (_f ("flag `%s' not found", font_char));
+ }
+
+ SCM stroke_style_scm = me->get_grob_property ("stroke-style");
+ if (gh_string_p (stroke_style_scm))
+ {
+ String stroke_style = ly_scm2string (stroke_style_scm);
+ if (!stroke_style.empty_b ())
+ {
+ String font_char = to_string (dir) + stroke_style;
+ Molecule stroke = fm->find_by_name ("flags-" + font_char);
+ if (stroke.empty_b ())
+ {
+ me->warning (_f ("flag stroke `%s' not found", font_char));
+ }
+ else
+ {
+ flag.add_molecule (stroke);
+ }
+ }
}
- char c = (dir_ == UP) ? 'u' : 'd';
- Molecule m = lookup_l ()->afm_find (String ("flags-") + to_str (c) +
- to_str (flag_i_));
- if (!style.empty_b ())
- m.add_molecule(lookup_l ()->afm_find (String ("flags-") + to_str (c) + style));
- return m;
+ return flag;
}
-Interval
-Stem::do_width () const
+MAKE_SCHEME_CALLBACK (Stem,dim_callback,2);
+SCM
+Stem::dim_callback (SCM e, SCM ax)
{
+ Axis a = (Axis) gh_scm2int (ax);
+ assert (a == X_AXIS);
+ Grob *se = unsmob_grob (e);
Interval r (0, 0);
- if (beam_l_ || abs (flag_i_) <= 2)
+ if (unsmob_grob (se->get_grob_property ("beam")) || abs (duration_log (se)) <= 2)
; // TODO!
else
{
- r = flag ().dim_.x ();
- r += note_delta_f ();
+ r = flag (se).extent (X_AXIS);
}
- return r;
+ return ly_interval2scm (r);
}
+
+MAKE_SCHEME_CALLBACK (Stem,brew_molecule,1);
-
-const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
-
-Molecule*
-Stem::do_brew_molecule_p () const
+SCM
+Stem::brew_molecule (SCM smob)
{
- Molecule *mol_p =new Molecule;
- Drul_array<Real> stem_y = yextent_drul_;
- Real dy = staff_line_leading_f ()/2.0;
-
- Real head_wid = 0;
- if (head_l_arr_.size ())
- head_wid = head_l_arr_[0]->extent (X_AXIS).length ();
- stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
+ Grob*me = unsmob_grob (smob);
+ Molecule mol;
+ Direction d = get_direction (me);
- if (!invisible_b ())
+
+
+ Real y1;
+
+ /*
+ This is required to avoid stems passing in tablature chords...
+ */
+
+
+ /*
+ TODO: make the stem start a direction ?
+ */
+ if (to_boolean (me->get_grob_property ("avoid-note-head")))
{
- Real stem_width = paper_l ()->get_var ("stemthickness");
- Molecule ss =lookup_l ()->filledbox (Box (Interval (-stem_width/2, stem_width/2),
- Interval (stem_y[DOWN]*dy, stem_y[UP]*dy)));
- mol_p->add_molecule (ss);
+ Grob * lh = last_head (me);
+ if (!lh)
+ return SCM_EOL;
+ y1 = Staff_symbol_referencer::get_position (lh);
}
+ else
+ {
+ Grob * lh = first_head (me);
+ if (!lh)
+ return SCM_EOL;
+ y1 = Staff_symbol_referencer::get_position (lh);
+ }
+
+ Real y2 = stem_end_position (me);
+
+ Interval stem_y (y1 <? y2,y2 >? y1);
+
- if (!beam_l_ && abs (flag_i_) > 2)
+ // dy?
+ Real dy = Staff_symbol_referencer::staff_space (me) * 0.5;
+
+ if (Grob *hed = support_head (me))
+ {
+ /*
+ must not take ledgers into account.
+ */
+ Interval head_height = Note_head::head_extent (hed,Y_AXIS);
+ Real y_attach = Note_head::stem_attachment_coordinate ( hed, Y_AXIS);
+
+ y_attach = head_height.linear_combination (y_attach);
+ stem_y[Direction (-d)] += d * y_attach/dy;
+ }
+
+ if (!invisible_b (me))
{
- Molecule fl = flag ();
- fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
- mol_p->add_molecule (fl);
+ Real stem_width = gh_scm2double (me->get_grob_property ("thickness"))
+ // URG
+ * me->get_paper ()->get_var ("linethickness");
+
+ Molecule ss =Lookup::filledbox (Box (Interval (-stem_width/2, stem_width/2),
+ Interval (stem_y[DOWN]*dy, stem_y[UP]*dy)));
+ mol.add_molecule (ss);
}
- if (head_l_arr_.size())
+ if (!get_beam (me) && abs (duration_log (me)) > 2)
{
- mol_p->translate_axis (note_delta_f (), X_AXIS);
+ Molecule fl = flag (me);
+ fl.translate_axis (stem_y[d]*dy, Y_AXIS);
+ mol.add_molecule (fl);
}
- return mol_p;
+
+ return mol.smobbed_copy ();
}
-Real
-Stem::note_delta_f () const
+/*
+ move the stem to right of the notehead if it is up.
+ */
+MAKE_SCHEME_CALLBACK (Stem,off_callback,2);
+SCM
+Stem::off_callback (SCM element_smob, SCM)
{
+ Grob *me = unsmob_grob (element_smob);
+
Real r=0;
- if (head_l_arr_.size())
+
+ if (head_count (me) == 0)
{
- Interval head_wid(0, head_l_arr_[0]->extent (X_AXIS).length ());
- Real rule_thick(paper_l ()->rule_thickness ());
- Interval stem_wid(-rule_thick/2, rule_thick/2);
- if (dir_ == CENTER)
- r = head_wid.center ();
+ return gh_double2scm (0.0);
+ }
+
+ if (Grob * f = first_head (me))
+ {
+ Interval head_wid = Note_head::head_extent(f, X_AXIS);
+
+
+ Real attach =0.0;
+
+ if (invisible_b (me))
+ {
+ attach = 0.0;
+ }
else
- r = head_wid[dir_] - stem_wid[dir_];
+ attach = Note_head::stem_attachment_coordinate(f, X_AXIS);
+
+ Direction d = get_direction (me);
+
+ Real real_attach = head_wid.linear_combination (d * attach);
+
+ r = real_attach;
+
+ /*
+ If not centered: correct for stem thickness.
+ */
+ if (attach)
+ {
+ Real rule_thick
+ = gh_scm2double (me->get_grob_property ("thickness"))
+ * me->get_paper ()->get_var ("linethickness");
+
+
+ r += - d * rule_thick * 0.5;
+ }
}
- return r;
+ return gh_double2scm (r);
}
-Real
-Stem::hpos_f () const
+Grob*
+Stem::get_beam (Grob*me)
{
- return note_delta_f () + Item::hpos_f ();
+ SCM b= me->get_grob_property ("beam");
+ return unsmob_grob (b);
+}
+
+Stem_info
+Stem::get_stem_info (Grob *me)
+{
+ /* Return cached info if available */
+ SCM scm_info = me->get_grob_property ("stem-info");
+ if (!gh_pair_p (scm_info))
+ {
+ calc_stem_info (me);
+ scm_info = me->get_grob_property ("stem-info");
+ }
+
+ Stem_info si;
+ si.dir_ = Directional_element_interface::get (me);
+ si.ideal_y_ = gh_scm2double (gh_car (scm_info));
+ si.shortest_y_ = gh_scm2double (gh_cadr (scm_info));
+ return si;
}
void
-Stem::do_substitute_element_pointer (Score_element*o,Score_element*n)
+Stem::calc_stem_info (Grob *me)
{
- if (Note_head*h=dynamic_cast<Note_head*> (o))
- head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
- if (Rest *r=dynamic_cast<Rest*> (o))
- rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));
- if (Beam* b = dynamic_cast<Beam*> (o))
+ /* Tab notation feature: make stem end extend out of staff. */
+ SCM up_to_staff = me->get_grob_property ("up-to-staff");
+ if (to_boolean (up_to_staff))
+ {
+ int line_count = Staff_symbol_referencer::line_count (me);
+ Direction dir = get_direction (me);
+ Real ideal_y = dir * (line_count + 1.5);
+ Real shortest_y = ideal_y;
+
+ me->set_grob_property ("stem-info",
+ scm_list_n (gh_double2scm (ideal_y),
+ gh_double2scm (shortest_y),
+ SCM_UNDEFINED));
+ return;
+ }
+
+ Direction my_dir = Directional_element_interface::get (me);
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Grob *beam = get_beam (me);
+ Real beam_translation = Beam::get_beam_translation (beam);
+ Real beam_thickness = gh_scm2double (beam->get_grob_property ("thickness"));
+ int beam_count = Beam::get_direction_beam_count (beam, my_dir);
+
+
+ /* Simple standard stem length */
+ Real ideal_length =
+ gh_scm2double (robust_list_ref
+ (beam_count - 1,
+ me->get_grob_property ("beamed-lengths")))
+ * staff_space
+ /* stem only extends to center of beam */
+ - 0.5 * beam_thickness;
+
+
+ /* Condition: sane minimum free stem length (chord to beams) */
+ Real ideal_minimum_free =
+ gh_scm2double (robust_list_ref
+ (beam_count - 1,
+ me->get_grob_property ("beamed-minimum-free-lengths")))
+ * staff_space;
+
+
+ /* UGH
+ It seems that also for ideal minimum length, we must use
+ the maximum beam count (for this direction):
+
+ \score{ \notes\relative c''{ [a8 a32] }}
+
+ must be horizontal. */
+ Real height_of_my_beams = beam_thickness
+ + (beam_count - 1) * beam_translation;
+
+ Real ideal_minimum_length = ideal_minimum_free
+ + height_of_my_beams
+ /* stem only extends to center of beam */
+ - 0.5 * beam_thickness;
+
+ ideal_length = ideal_length >? ideal_minimum_length;
+
+
+ /* Convert to Y position, calculate for dir == UP */
+ Real note_start =
+ /* staff positions */
+ head_positions (me)[my_dir] * 0.5
+ * my_dir;
+ Real ideal_y = note_start + ideal_length;
+
+
+ /* Conditions for Y position */
+
+ /* Lowest beam of (UP) beam must never be lower than second staffline
+
+ Reference?
+
+ Although this (additional) rule is probably correct,
+ I expect that highest beam (UP) should also never be lower
+ than middle staffline, just as normal stems.
+
+ Reference?
+
+ Obviously not for grace beams.
+
+ Also, not for knees. Seems to be a good thing. */
+ SCM grace = me->get_grob_property ("grace");
+ bool grace_b = to_boolean (grace);
+ bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));
+ bool knee_b = to_boolean (beam->get_grob_property ("knee"));
+ if (!grace_b && !no_extend_b && !knee_b)
{
- if (b == beam_l_)
- beam_l_ = dynamic_cast<Beam*> (n);
+ /* Highest beam of (UP) beam must never be lower than middle
+ staffline */
+ ideal_y = ideal_y >? 0;
+ /* Lowest beam of (UP) beam must never be lower than second staffline */
+ ideal_y = ideal_y >? (-staff_space
+ - beam_thickness + height_of_my_beams);
}
- Staff_symbol_referencer::do_substitute_element_pointer (o,n);
+
+
+ SCM shorten = beam->get_grob_property ("shorten");
+ if (gh_number_p (shorten))
+ ideal_y -= gh_scm2double (shorten);
+
+
+ Real minimum_free =
+ gh_scm2double (robust_list_ref
+ (beam_count - 1,
+ me->get_grob_property
+ ("beamed-extreme-minimum-free-lengths")))
+ * staff_space;
+
+ Real minimum_length = minimum_free
+ + height_of_my_beams
+ /* stem only extends to center of beam */
+ - 0.5 * beam_thickness;
+
+ Real minimum_y = note_start + minimum_length;
+
+
+ ideal_y *= my_dir;
+ Real shortest_y = minimum_y * my_dir;
+
+ me->set_grob_property ("stem-info",
+ scm_list_n (gh_double2scm (ideal_y),
+ gh_double2scm (shortest_y),
+ SCM_UNDEFINED));
}
+
+Slice
+Stem::beam_multiplicity (Grob *stem)
+{
+ SCM beaming= stem->get_grob_property ("beaming");
+ Slice l = int_list_to_slice (gh_car (beaming));
+ Slice r = int_list_to_slice (gh_cdr (beaming));
+ l.unite (r);
+
+ return l;
+}
+
+
+ADD_INTERFACE (Stem,"stem-interface",
+ "A stem",
+ "french-beaming up-to-staff avoid-note-head adjust-if-on-staffline thickness stem-info beamed-lengths beamed-minimum-free-lengths beamed-extreme-minimum-free-lengths lengths beam stem-shorten duration-log beaming neutral-direction stem-end-position support-head note-heads direction length flag-style no-stem-extend stroke-style");
+
+
projects / lilypond.git / blobdiff