+/*
+ stem.cc -- implement Stem
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 1996--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
+
+ TODO: This is way too hairy
+*/
+
+#include <math.h> // m_pi
+
+#include "lookup.hh"
+#include "directional-element-interface.hh"
+#include "note-head.hh"
#include "stem.hh"
-#include "dimen.hh"
#include "debug.hh"
#include "paper-def.hh"
-#include "notehead.hh"
-#include "lookup.hh"
+#include "rhythmic-head.hh"
+#include "font-interface.hh"
#include "molecule.hh"
-#include "pcol.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"
-const int STEMLEN=7;
+void
+Stem::set_beaming (Grob*me ,int i, Direction d)
+{
+ SCM pair = me->get_grob_property ("beaming");
+
+ if (!gh_pair_p (pair))
+ {
+ pair = gh_cons (gh_int2scm (-1),gh_int2scm (-1));
+ me-> set_grob_property ("beaming", pair);
+ }
+ index_set_cell (pair, d, gh_int2scm (i));
+}
+int
+Stem::beam_count (Grob*me,Direction d)
+{
+ SCM p=me->get_grob_property ("beaming");
+ if (gh_pair_p (p))
+ return gh_scm2int (index_cell (p,d));
+ else
+ return -1;
+}
-Stem::Stem(int c) //, Moment len)
+Interval
+Stem::head_positions (Grob*me)
{
- beams_left = 0;
- beams_right = 0;
- minnote = 1000; // invalid values
- maxnote = -1000;
- bot = top = 0;
- flag = 4;
- dir =0;
- staff_center=c;
- stemlen=0;
- print_flag=true;
- stem_xoffset=0;
+ if (!heads_i (me))
+ {
+ Interval iv;
+ return iv;
+ }
+
+ Drul_array<Grob*> e (extremal_heads (me));
+
+ return Interval (Staff_symbol_referencer::position_f (e[DOWN]),
+ Staff_symbol_referencer::position_f (e[UP]));
}
-void
-Stem::do_print() const
+
+Real
+Stem::chord_start_f (Grob*me)
{
-#ifndef NPRINT
- mtor << "flag "<< flag << " print_flag " << print_flag
- << "min,max [" << minnote << ", " << maxnote << "]";
-#endif
+ return head_positions (me)[get_direction (me)]
+ * Staff_symbol_referencer::staff_space (me)/2.0;
}
-void
-Stem::set_stemend(Real se)
+
+Real
+Stem::stem_end_position (Grob*me)
{
+ SCM p =me->get_grob_property ("stem-end-position");
+ Real pos;
+ if (!gh_number_p (p))
+ {
+ pos = get_default_stem_end_position (me);
+ me->set_grob_property ("stem-end-position", gh_double2scm (pos));
+ }
+ else
+ pos = gh_scm2double (p);
- // todo: margins
- if (! ((dir > 0 && se >= maxnote) || (se <= minnote && dir <0)) )
- warning("Weird stem size; check for narrow beams",0);
-
- top = (dir < 0) ? maxnote : se;
- bot = (dir < 0) ? se : minnote;
- flag = dir*abs(flag);
+ return pos;
+}
+
+Direction
+Stem::get_direction (Grob*me)
+{
+ Direction d = Directional_element_interface::get (me);
+
+ if (!d)
+ {
+ d = get_default_dir (me);
+ // urg, AAARGH!
+ Directional_element_interface::set (me, d);
+ }
+ return d ;
}
+
void
-Stem::add(Notehead *n)
+Stem::set_stemend (Grob*me, Real se)
{
- assert(status < PRECALCED);
-
- if (n->balltype == 1)
- return;
- int p = n->position;
- if (p < minnote)
- minnote = p;
- if (p > maxnote)
- maxnote = p;
- heads.push(n);
- n->add_dependency(this);
+ // 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));
+}
+
+int
+Stem::type_i (Grob*me)
+{
+ return first_head (me) ? Rhythmic_head::balltype_i (first_head (me)) : 2;
+}
+
+/*
+ Note head that determines hshift for upstems
+ */
+Grob*
+Stem::support_head (Grob*me)
+{
+ SCM h = me->get_grob_property ("support-head");
+ Grob * nh = unsmob_grob (h);
+ if (nh)
+ return nh;
+ else if (heads_i (me) == 1)
+ {
+ /*
+ UGH.
+ */
+
+ return unsmob_grob (ly_car (me->get_grob_property ("heads")));
+ }
+ else
+ return first_head (me);
}
int
-Stem::get_default_dir()
+Stem::heads_i (Grob*me)
{
- if (dir)
- return dir;
- Real mean = (minnote+maxnote)/2;
- return (mean > staff_center) ? -1: 1;
+ return Pointer_group_interface::count (me, "heads");
}
-void
-Stem::set_default_dir()
+/*
+ The note head which forms one end of the stem.
+ */
+Grob*
+Stem::first_head (Grob*me)
{
- dir = get_default_dir();
+ return extremal_heads (me)[-get_direction (me)];
}
-void
-Stem::set_default_stemlen()
+/*
+ START is part where stem reaches `last' head.
+ */
+Drul_array<Grob*>
+Stem::extremal_heads (Grob*me)
{
- if (!dir)
- set_default_dir();
+ const int inf = 1000000;
+ Drul_array<int> extpos;
+ extpos[DOWN] = inf;
+ extpos[UP] = -inf;
+
+ Drul_array<Grob *> exthead;
+ exthead[LEFT] = exthead[RIGHT] =0;
+
+ for (SCM s = me->get_grob_property ("heads"); gh_pair_p (s); s = ly_cdr (s))
+ {
+ Grob * n = unsmob_grob (ly_car (s));
- int stafftop = 2*staff_center;
- stemlen = STEMLEN + (maxnote - minnote);
-
- // uhh... how about non 5-line staffs?
- if (maxnote < -2 && dir == 1){
- int t = staff_center - staff_center/2;
- stemlen = t - minnote +2;
- } else if (minnote > stafftop + 2 && dir == -1) {
- int t = staff_center + staff_center/2;
- stemlen = maxnote -t +2;
+
+ int p = int (Staff_symbol_referencer::position_f (n));
+
+ Direction d = LEFT;
+ do {
+ if (d* p > d* extpos[d])
+ {
+ exthead[d] = n;
+ extpos[d] = p;
+ }
+ } while (flip (&d) != DOWN);
}
- assert(stemlen);
+ return exthead;
+}
+
+static int
+icmp (int const &a, int const &b)
+{
+ return a-b;
+}
+
+Array<int>
+Stem::note_head_positions (Grob *me)
+{
+ Array<int> ps ;
+ for (SCM s = me->get_grob_property ("heads"); gh_pair_p (s); s = ly_cdr (s))
+ {
+ Grob * n = unsmob_grob (ly_car (s));
+ int p = int (Staff_symbol_referencer::position_f (n));
+
+ ps.push (p);
+ }
+
+ ps.sort (icmp);
+ return ps;
}
void
-Stem::set_default_extents()
+Stem::add_head (Grob*me, Grob *n)
{
- if (minnote > maxnote) {
- warning("Empty stem. Ugh!", 0);
- minnote = -10;
- maxnote = 20;
+ 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 ("heads"), n);
}
+}
- if (!stemlen)
- set_default_stemlen();
+bool
+Stem::invisible_b (Grob*me)
+{
+ return ! (heads_i (me) && Rhythmic_head::balltype_i (support_head (me)) >= 1);
+}
- set_stemend((dir< 0) ? maxnote-stemlen: minnote +stemlen);
- if (dir > 0){
- stem_xoffset = paper()->note_width()-paper()->rule_thickness();
- } else
- stem_xoffset = 0;
+int
+Stem::get_center_distance (Grob*me, Direction d)
+{
+ int staff_center = 0;
+ int distance = (int) (d* (head_positions (me)[d] - staff_center));
+ return distance >? 0;
}
-void
-Stem::set_noteheads()
-{
- if(!heads.size())
- return;
- heads.sort(Notehead::compare);
- heads[0]->extremal = -1;
- heads.top()->extremal = 1;
- int parity=1;
- int lastpos = heads[0]->position;
- for (int i=1; i < heads.size(); i ++) {
- int dy =abs(lastpos- heads[i]->position);
-
- if (dy <= 1) {
- if (parity)
- heads[i]->x_dir = (stem_xoffset>0) ? 1:-1;
- parity = !parity;
- } else
- parity = 0;
- lastpos = heads[i]->position;
+Direction
+Stem::get_default_dir (Grob*me)
+{
+ int du = get_center_distance (me,UP);
+ int dd = get_center_distance (me,DOWN);
+
+ if (sign (dd - du))
+ return Direction (sign (dd -du));
+
+ return to_dir (me->get_grob_property ("neutral-direction"));
+}
+
+Real
+Stem::get_default_stem_end_position (Grob*me)
+{
+ bool grace_b = to_boolean (me->get_grob_property ("grace"));
+ SCM s;
+ Array<Real> a;
+
+ Real length_f = 0.;
+ SCM scm_len = me->get_grob_property ("length");
+ if (gh_number_p (scm_len))
+ {
+ length_f = gh_scm2double (scm_len);
+ }
+ else
+ {
+ s = me->get_grob_property ("lengths");
+ for (SCM q = s; q != SCM_EOL; q = ly_cdr (q))
+ a.push (gh_scm2double (ly_car (q)));
+
+ // stem uses half-spaces
+ length_f = a[ ((flag_i (me) - 2) >? 0) <? (a.size () - 1)] * 2;
+ }
+
+
+ a.clear ();
+ s = me->get_grob_property ("stem-shorten");
+ for (SCM q = s; gh_pair_p (q); q = ly_cdr (q))
+ a.push (gh_scm2double (ly_car (q)));
+
+
+ // stem uses half-spaces
+
+ // fixme: use scm_list_n_ref () iso. array[]
+ Real shorten_f = a[ ((flag_i (me) - 2) >? 0) <? (a.size () - 1)] * 2;
+
+ /* On boundary: shorten only half */
+ if (abs (chord_start_f (me)) == 0.5)
+ shorten_f *= 0.5;
+
+ /* URGURGURG
+ 'set-default-stemlen' sets direction too
+ */
+ 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_f (me)
+ && (get_direction (me) != get_default_dir (me)))
+ length_f -= shorten_f;
+
+ Interval hp = head_positions (me);
+ Real st = hp[dir] + dir * length_f;
+
+
+
+
+ /*
+ Make a little room if we have a flag and there is a dot.
+
+ TODO:
+
+ maybe we should consider moving the dot to the right?
+ */
+ if (!beam_l (me)
+ && flag_i (me))
+ {
+ Grob * closest_to_flag = extremal_heads (me)[dir];
+ Grob * dots = closest_to_flag
+ ? Rhythmic_head::dots_l (closest_to_flag ) : 0;
+
+ if (dots)
+ {
+ Real dp = Staff_symbol_referencer::position_f (dots);
+ Real flagy = flag (me).extent (Y_AXIS)[-dir] * 2; // should divide by staffspace
+
+ /*
+ Very gory: add myself to the X-support of the parent,
+ which should be a dot-column.
+ */
+ if (dir * (st + flagy - dp) < 0.5)
+ Side_position_interface::add_support (dots->get_parent (X_AXIS), me);
+
+ /*
+ previous approach was to lengthen the stem. This is not
+ good typesetting practice. */
+ }
+ }
+
+
+ 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;
+
+ return st;
+}
+
+
+
+/*
+ Number of hooks on the flag, ie. the log of the duration.
+ */
+int
+Stem::flag_i (Grob*me)
+{
+ SCM s = me->get_grob_property ("duration-log");
+ return (gh_number_p (s)) ? gh_scm2int (s) : 2;
}
void
-Stem::do_pre_processing()
+Stem::position_noteheads (Grob*me)
{
- if (bot == top)
- set_default_extents();
- set_noteheads();
+ if (!heads_i (me))
+ return;
+
+ Link_array<Grob> heads =
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "heads");
+
+ heads.sort (compare_position);
+ Direction dir =get_direction (me);
+
+ if (dir < 0)
+ heads.reverse ();
+
+
+ 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::position_f (heads[0]));
+ for (int i=1; i < heads.size (); i ++)
+ {
+ Real p = Staff_symbol_referencer::position_f (heads[i]);
+ int dy =abs (lastpos- (int)p);
+
+ if (dy <= 1)
+ {
+ if (parity)
+ {
+ Real l = Note_head::head_extent (heads[i], X_AXIS).length ();
+
+ heads[i]->translate_axis (l * get_direction (me), X_AXIS);
+ }
+ parity = !parity;
+ }
+ else
+ parity = true;
+
+ lastpos = int (p);
+ }
}
+MAKE_SCHEME_CALLBACK (Stem,before_line_breaking,1);
+SCM
+Stem::before_line_breaking (SCM smob)
+{
+ Grob*me = unsmob_grob (smob);
+ stem_end_position (me); // ugh. Trigger direction calc.
+ position_noteheads (me);
-Interval
-Stem::width()const
+ if (invisible_b (me))
+ {
+ me->remove_grob_property ("molecule-callback");
+ // suicide ();
+ }
+
+ 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)
{
- if (!print_flag || abs(flag) <= 4)
- return Interval(0,0); // TODO!
- Paper_def*p= paper();
- Interval r(p->lookup_l()->flag(flag).dim.x);
- r+= stem_xoffset;
- return r;
+ 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);
+ return ly_interval2scm (iv);
}
-Molecule*
-Stem::brew_molecule_p()const return out;
+
+Molecule
+Stem::flag (Grob*me)
{
- assert(bot!=top);
+ /* TODO: rename flag-style into something more appropriate,
+ e.g. "stroke-style", maybe with values "" (i.e. no stroke),
+ "single" and "double". Needs more discussion.
+ */
+ String style, fstyle, staffline_offs;
+ SCM fst = me->get_grob_property ("flag-style");
+ if (gh_string_p (fst))
+ {
+ fstyle = ly_scm2string (fst);
+ }
+
+ SCM st = me->get_grob_property ("style");
+ if (gh_symbol_p (st))
+ {
+ style = (ly_scm2string (scm_symbol_to_string (st)));
+ }
+ else
+ {
+ style = "";
+ }
+ bool adjust = to_boolean (me->get_grob_property ("adjust-if-on-staffline"));
+
+ if (String::compare_i (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). */
+ Grob *first = first_head(me);
+ int sz = Staff_symbol_referencer::line_count (me)-1;
+ int p = (int)rint (Staff_symbol_referencer::position_f (first));
+ staffline_offs = (((p ^ sz) & 0x1) == 0) ? "1" : "0";
+ }
+ else
+ {
+ staffline_offs = "2";
+ }
+ }
+ else
+ {
+ staffline_offs = "";
+ }
+ char c = (get_direction (me) == UP) ? 'u' : 'd';
+ String index_str
+ = String ("flags-") + style + to_str (c) + staffline_offs + to_str (flag_i (me));
+ Molecule m
+ = Font_interface::get_default_font (me)->find_by_name (index_str);
+ if (!fstyle.empty_b ())
+ m.add_molecule (Font_interface::get_default_font (me)->find_by_name (String ("flags-") + to_str (c) + fstyle));
+ return m;
+}
+
+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 (unsmob_grob (se->get_grob_property ("beam")) || abs (flag_i (se)) <= 2)
+ ; // TODO!
+ else
+ {
+ r = flag (se).extent (X_AXIS);
+ }
+ return ly_interval2scm (r);
+}
-
- Paper_def *p =paper();
- Real dy = p->internote();
- Symbol ss =p->lookup_l()->stem(bot*dy,top*dy);
+MAKE_SCHEME_CALLBACK (Stem,brew_molecule,1);
+
+SCM
+Stem::brew_molecule (SCM smob)
+{
+ Grob*me = unsmob_grob (smob);
+ Molecule mol;
+ Direction d = get_direction (me);
+
+
+ Real y1 = Staff_symbol_referencer::position_f (first_head (me));
+ Real y2 = stem_end_position (me);
+
+ Interval stem_y (y1 <? y2,y2 >? y1);
+
+
+ // 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))
+ {
+ Real stem_width = gh_scm2double (me->get_grob_property ("thickness"))
+ // URG
+ * me->paper_l ()->get_var ("stafflinethickness");
+
+ 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 (!beam_l (me) && abs (flag_i (me)) > 2)
+ {
+ Molecule fl = flag (me);
+ fl.translate_axis (stem_y[d]*dy, Y_AXIS);
+ mol.add_molecule (fl);
+ }
+
+ return mol.smobbed_copy ();
+}
+
+/*
+ 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 (Grob * f = first_head (me))
+ {
+ Interval head_wid = Note_head::head_extent(f, X_AXIS);
+
+ Real 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->paper_l ()->get_var ("stafflinethickness");
+
+
+ r += - d * rule_thick * 0.5;
+ }
+ }
+ return gh_double2scm (r);
+}
+
+
+
+Grob*
+Stem::beam_l (Grob*me)
+{
+ SCM b= me->get_grob_property ("beam");
+ return unsmob_grob (b);
+}
+
+
+// ugh still very long.
+Stem_info
+Stem::calc_stem_info (Grob*me)
+{
+ SCM scm_info = me->get_grob_property ("stem-info");
+
+ if (gh_pair_p (scm_info ))
+ {
+ Stem_info si ;
+
+ si.ideal_y = gh_scm2double (gh_car (scm_info));
+ si.max_y = gh_scm2double (gh_cadr (scm_info));
+ si.min_y = gh_scm2double (gh_caddr (scm_info));
+
+ return si;
+ }
+
+ Grob * beam = beam_l (me);
+
+ Direction beam_dir = Directional_element_interface::get (beam);
+ if (!beam_dir)
+ {
+ programming_error ("Beam dir not set.");
+ beam_dir = UP;
+ }
- out = new Molecule(Atom(ss));
- if (print_flag&&abs(flag) > 4){
- Symbol fl = p->lookup_l()->flag(flag);
- Molecule m(fl);
- if (flag < -4){
- out->add_bottom(m);
- } else if (flag > 4) {
- out->add_top(m);
- } else
- assert(false);
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+ Real half_space = staff_space / 2;
+
+ int multiplicity = Beam::get_multiplicity (beam);
+ Real interbeam_f = Beam::get_interbeam (beam);
+
+ Real thick = gh_scm2double (beam->get_grob_property ("thickness"));
+ Stem_info info;
+ info.ideal_y = chord_start_f (me);
+
+ // for simplicity, we calculate as if dir == UP
+ info.ideal_y *= beam_dir;
+ SCM grace_prop = me->get_grob_property ("grace");
+
+ bool grace_b = to_boolean (grace_prop);
+
+ Array<Real> a;
+ SCM s;
+
+ s = me->get_grob_property ("beamed-minimum-lengths");
+ a.clear ();
+ for (SCM q = s; q != SCM_EOL; q = ly_cdr (q))
+ a.push (gh_scm2double (ly_car (q)));
+
+
+ Real minimum_length = a[multiplicity <? (a.size () - 1)] * staff_space;
+ s = me->get_grob_property ("beamed-lengths");
+
+ a.clear ();
+ for (SCM q = s; q != SCM_EOL; q = ly_cdr (q))
+ a.push (gh_scm2double (ly_car (q)));
+
+ Real stem_length = a[multiplicity <? (a.size () - 1)] * staff_space;
+
+ if (!beam_dir || (beam_dir == Directional_element_interface::get (me)))
+ /* normal beamed stem */
+ {
+ if (multiplicity)
+ {
+ info.ideal_y += thick + (multiplicity - 1) * interbeam_f;
+ }
+ info.min_y = info.ideal_y;
+ info.max_y = 1000; // INT_MAX;
+
+ info.ideal_y += stem_length;
+ info.min_y += minimum_length;
+
+ /*
+ lowest beam of (UP) beam must never be lower than second staffline
+
+ Hmm, reference (Wanske?)
+
+ 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.
+
+ */
+ bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));
+ if (!grace_b && !no_extend_b)
+ {
+ /* highest beam of (UP) beam must never be lower than middle
+ staffline
+ lowest beam of (UP) beam must never be lower than second staffline
+ */
+ info.min_y =
+ info.min_y >? 0
+ >? (- 2 * half_space - thick
+ + (multiplicity > 0) * thick
+ + interbeam_f * (multiplicity - 1));
+ }
}
+ else
+ /* knee */
+ {
+ info.ideal_y -= thick;
+ info.max_y = info.ideal_y;
+ info.min_y = - 1000 ; // INT_MAX;
- out->translate(Offset(stem_xoffset,0));
+ info.ideal_y -= stem_length;
+ info.max_y -= minimum_length;
+ }
+
+ info.ideal_y = (info.max_y <? info.ideal_y) >? info.min_y;
+
+ s = beam->get_grob_property ("shorten");
+ if (gh_number_p (s))
+ info.ideal_y -= gh_scm2double (s);
+
+ Grob *common = me->common_refpoint (beam, Y_AXIS);
+ Real interstaff_f = beam_dir *
+ (me->relative_coordinate (common, Y_AXIS)
+ - beam->relative_coordinate (common, Y_AXIS));
+
+ info.ideal_y += interstaff_f;
+ info.min_y += interstaff_f;
+ info.max_y += interstaff_f ;
+
+ me->set_grob_property ("stem-info",
+ scm_list_n (gh_double2scm (info.ideal_y),
+ gh_double2scm (info.max_y),
+ gh_double2scm (info.min_y),
+ SCM_UNDEFINED));
+
+ return info;
}
-Real
-Stem::hindex()const
+bool
+Stem::has_interface (Grob*m)
{
- return pcol_l_->hpos + stem_xoffset; // hmm. + offset_.x;
+ return m && m->has_interface (ly_symbol2scm ("stem-interface"));
}
+ADD_INTERFACE (Stem,"stem-interface",
+ "A stem",
+ "thickness stem-info beamed-lengths beamed-minimum-lengths lengths beam stem-shorten duration-log beaming neutral-direction stem-end-position support-head heads direction length style no-stem-extend flag-style dir-forced");
projects / lilypond.git / blobdiff