source file of the GNU LilyPond music typesetter
- (c) 1996--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1996--2002 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> // m_pi
+
+#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 "rhythmic-head.hh"
#include "font-interface.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_beaming (Grob*me ,int i, Direction d)
+Stem::set_beaming (Grob*me, int beam_count, Direction d)
{
SCM pair = me->get_grob_property ("beaming");
if (!gh_pair_p (pair))
{
- pair = gh_cons (gh_int2scm (0),gh_int2scm (0));
- me-> set_grob_property ("beaming", pair);
+ pair = gh_cons (SCM_EOL, SCM_EOL);
+ 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 0;
+ 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);
}
+
Interval
Stem::head_positions (Grob*me)
{
- if (!heads_i (me))
+ if (!head_count (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]));
+ return Interval (Staff_symbol_referencer::get_position (e[DOWN]),
+ Staff_symbol_referencer::get_position (e[UP]));
}
Real
-Stem::chord_start_f (Grob*me)
+Stem::chord_start_y (Grob*me)
{
return head_positions (me)[get_direction (me)]
* Staff_symbol_referencer::staff_space (me)/2.0;
Real pos;
if (!gh_number_p (p))
{
-
pos = get_default_stem_end_position (me);
me->set_grob_property ("stem-end-position", gh_double2scm (pos));
}
Direction d= get_direction (me);
if (d && d * head_positions (me)[get_direction (me)] >= se*d)
- warning (_ ("Weird stem size; check for narrow beams"));
+ 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
- */
+
+ WARNING: triggers direction
+*/
Grob*
Stem::support_head (Grob*me)
{
Grob * nh = unsmob_grob (h);
if (nh)
return nh;
- else if (heads_i (me) == 1)
+ else if (head_count (me) == 1)
{
/*
UGH.
*/
- return unsmob_grob (gh_car (me->get_grob_property ("heads")));
+ return unsmob_grob (ly_car (me->get_grob_property ("note-heads")));
}
else
return first_head (me);
int
-Stem::heads_i (Grob*me)
+Stem::head_count (Grob*me)
{
- return Pointer_group_interface::count (me, "heads");
+ return Pointer_group_interface::count (me, "note-heads");
}
/*
The note head which forms one end of the stem.
- */
+
+ WARNING: triggers direction
+*/
Grob*
Stem::first_head (Grob*me)
{
- return extremal_heads (me)[-get_direction (me)];
+ Direction d = get_direction (me);
+ if (!d)
+ return 0;
+ return extremal_heads (me)[-d];
+}
+
+/*
+ The note head opposite to the first head.
+ */
+Grob*
+Stem::last_head (Grob*me)
+{
+ Direction d = get_direction (me);
+ if (!d)
+ return 0;
+ return extremal_heads (me)[d];
}
/*
Drul_array<Grob *> exthead;
exthead[LEFT] = exthead[RIGHT] =0;
- for (SCM s = me->get_grob_property ("heads"); gh_pair_p (s); s = gh_cdr (s))
+ for (SCM s = me->get_grob_property ("note-heads"); gh_pair_p (s); s = ly_cdr (s))
{
- Grob * n = unsmob_grob (gh_car (s));
+ Grob * n = unsmob_grob (ly_car (s));
- int p = int (Staff_symbol_referencer::position_f (n));
+ int p = int (Staff_symbol_referencer::get_position (n));
Direction d = LEFT;
do {
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 ("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));
+
+ ps.push (p);
+ }
+
+ ps.sort (icmp);
+ return ps;
+}
+
+
void
Stem::add_head (Grob*me, Grob *n)
{
if (Note_head::has_interface (n))
{
- Pointer_group_interface::add_element (me, "heads",n);
- }
- else
- {
- n->set_grob_property ("rest", n->self_scm ());
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-heads"), n);
}
}
bool
Stem::invisible_b (Grob*me)
{
- return ! (heads_i (me) && Rhythmic_head::balltype_i (support_head (me)) >= 1);
-}
-
-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;
+ return ! (head_count (me)
+ && gh_scm2int (me->get_grob_property ("duration-log")) >= 1);
}
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));
+ 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 to_dir (me->get_grob_property ("default-neutral-direction"));
+ return to_dir (me->get_grob_property ("neutral-direction"));
}
Real
Stem::get_default_stem_end_position (Grob*me)
{
+ /* 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;
- Real length_f = 0.;
+ Real length_f = 3.5;
SCM scm_len = me->get_grob_property ("length");
if (gh_number_p (scm_len))
{
else
{
s = me->get_grob_property ("lengths");
- for (SCM q = s; q != SCM_EOL; q = gh_cdr (q))
- a.push (gh_scm2double (gh_car (q)));
-
- // stem uses half-spaces
- length_f = a[ ((flag_i (me) - 2) >? 0) <? (a.size () - 1)] * 2;
+ if (gh_pair_p (s))
+ {
+ length_f = 2* gh_scm2double (robust_list_ref (duration_log(me) -2, s));
+ }
}
+ 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));
+ }
- a.clear ();
- s = me->get_grob_property ("stem-shorten");
- for (SCM q = s; gh_pair_p (q); q = gh_cdr (q))
- a.push (gh_scm2double (gh_car (q)));
-
-
- // stem uses half-spaces
-
- // fixme: use gh_list_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_y (me)) == 0.5)
+ shorten_f *= 0.5;
/* URGURGURG
'set-default-stemlen' sets direction too
Directional_element_interface::set (me, dir);
}
- /*
- stems in unnatural (forced) direction should be shortened,
- according to [Roush & Gourlay]
- */
- if (( (int)chord_start_f (me))
+ /* 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;
+ 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.
+ */
+ }
+ }
+ }
+ }
- Real st = head_positions (me)[dir] + dir * length_f;
-
- 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.
+
+ the log of the duration (Number of hooks on the flag minus two)
*/
int
-Stem::flag_i (Grob*me)
+Stem::duration_log (Grob*me)
{
SCM s = me->get_grob_property ("duration-log");
return (gh_number_p (s)) ? gh_scm2int (s) : 2;
void
Stem::position_noteheads (Grob*me)
{
- if (!heads_i (me))
+ if (!head_count (me))
return;
Link_array<Grob> heads =
- Pointer_group_interface__extract_elements (me, (Grob*)0, "heads");
+ Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-heads");
heads.sort (compare_position);
Direction dir =get_direction (me);
heads.reverse ();
+ bool invisible = invisible_b (me);
+ Real thick = 0.0;
+ if (invisible)
+ thick = gh_scm2double (me->get_grob_property ("thickness"))
+ * me->get_paper ()->get_var ("linethickness");
+
+
Grob *hed = support_head (me);
- Real w = hed->extent (hed, X_AXIS)[dir];
+ Real w = Note_head::head_extent (hed,X_AXIS)[dir];
for (int i=0; i < heads.size (); i++)
{
- heads[i]->translate_axis (w - heads[i]->extent (heads[i], X_AXIS)[dir], X_AXIS);
+ 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]));
+ int lastpos = int (Staff_symbol_referencer::get_position (heads[0]));
for (int i=1; i < heads.size (); i ++)
{
- Real p = Staff_symbol_referencer::position_f (heads[i]);
+ Real p = Staff_symbol_referencer::get_position (heads[i]);
int dy =abs (lastpos- (int)p);
if (dy <= 1)
{
if (parity)
{
- Real l = heads[i]->extent (heads[i], X_AXIS).length ();
- heads[i]->translate_axis (l * get_direction (me), X_AXIS);
+ Real l = Note_head::head_extent (heads[i], X_AXIS).length ();
+
+ Direction d = get_direction (me);
+ heads[i]->translate_axis (l * d, X_AXIS);
+
+ if (invisible_b(me))
+ heads[i]->translate_axis (-thick *2* 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;
}
Stem::before_line_breaking (SCM smob)
{
Grob*me = unsmob_grob (smob);
- stem_end_position (me); // ugh. Trigger direction calc.
- position_noteheads (me);
- if (invisible_b (me))
+
+ /*
+ Do the calculations for visible stems, but also for invisible stems
+ with note heads (i.e. half notes.)
+ */
+ if (head_count (me))
{
- me->remove_grob_property ("molecule-callback");
- // suicide ();
+ stem_end_position (me); // ugh. Trigger direction calc.
+ position_noteheads (me);
+ }
+ else
+ {
+ me->set_grob_property ("molecule-callback", SCM_EOL);
}
- set_spacing_hints (me);
return SCM_UNSPECIFIED;
}
-
/*
ugh.
When in a beam with tuplet brackets, brew_mol is called early,
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 Paper_column
-
- TODO: more advanced: supply height of noteheads as well, for more advanced spacing possibilities
- */
-void
-Stem::set_spacing_hints (Grob*me)
+Molecule
+Stem::flag (Grob*me)
{
- if (!invisible_b (me))
+ /* 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, staffline_offs;
+
+ SCM style_scm = me->get_grob_property ("style");
+ if (gh_symbol_p (style_scm))
{
- SCM scmdir = gh_int2scm (get_direction (me));
-
- Item* item = dynamic_cast<Item*> (me);
- Item * col = item->column_l ();
- SCM dirlist =col->get_grob_property ("dir-list");
- if (scm_sloppy_memq (scmdir, dirlist) == SCM_BOOL_F)
- {
- dirlist = gh_cons (scmdir, dirlist);
- col->set_grob_property ("dir-list", dirlist);
+ style = (ly_scm2string (scm_symbol_to_string (style_scm)));
+ }
+ else
+ {
+ style = "";
+ }
+ bool adjust = to_boolean (me->get_grob_property ("adjust-if-on-staffline"));
+
+ if (String::compare (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 = "";
+ }
+ char dir = (get_direction (me) == UP) ? 'u' : 'd';
+ String font_char =
+ 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 ())
+ {
+ me->warning (_f ("flag `%s' not found", font_char));
+ }
-Molecule
-Stem::flag (Grob*me)
-{
- String style;
- SCM st = me->get_grob_property ("flag-style");
- if (gh_string_p (st))
+ SCM stroke_scm = me->get_grob_property ("flag-style");
+ if (gh_string_p (stroke_scm))
{
- style = ly_scm2string (st);
+ String stroke = ly_scm2string (stroke_scm);
+ if (!stroke.empty_b ())
+ {
+ String font_char = to_string (dir) + stroke;
+ 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 = (get_direction (me) == UP) ? 'u' : 'd';
- Molecule m = Font_interface::get_default_font (me)->find_by_name (String ("flags-") + to_str (c) +
- to_str (flag_i (me)));
- if (!style.empty_b ())
- m.add_molecule (Font_interface::get_default_font (me)->find_by_name (String ("flags-") + to_str (c) + style));
- return m;
+ return flag;
}
MAKE_SCHEME_CALLBACK (Stem,dim_callback,2);
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)
+ if (unsmob_grob (se->get_grob_property ("beam")) || abs (duration_log (se)) <= 2)
; // TODO!
else
{
}
return ly_interval2scm (r);
}
-
+
MAKE_SCHEME_CALLBACK (Stem,brew_molecule,1);
Direction d = get_direction (me);
- Real y1 = Staff_symbol_referencer::position_f (first_head (me));
+
+ 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")))
+ {
+ 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);
- stem_y.unite (Interval (y2,y1));
+ Interval stem_y (y1 <? y2,y2 >? y1);
+
- Real dy = Staff_symbol_referencer::staff_space (me)/2.0;
- Real head_wid = 0;
+ // dy?
+ Real dy = Staff_symbol_referencer::staff_space (me) * 0.5;
- Real angle =0.0;
if (Grob *hed = support_head (me))
{
- head_wid = hed->extent (hed,X_AXIS).length ();
+ /*
+ 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);
- angle = gh_scm2double (hed->get_grob_property ("attachment-angle"));
+ y_attach = head_height.linear_combination (y_attach);
+ stem_y[Direction (-d)] += d * y_attach/dy;
}
- stem_y[Direction (-d)] += d * head_wid * tan (angle)/ (2*dy);
if (!invisible_b (me))
{
- Real stem_width = gh_scm2double (me->get_grob_property ("thickness")) * me->paper_l ()->get_var ("stafflinethickness");
+ 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 (!beam_l (me) && abs (flag_i (me)) > 2)
+ if (!get_beam (me) && abs (duration_log (me)) > 2)
{
Molecule fl = flag (me);
fl.translate_axis (stem_y[d]*dy, Y_AXIS);
Grob *me = unsmob_grob (element_smob);
Real r=0;
+
+ if (head_count (me) == 0)
+ {
+ return gh_double2scm (0.0);
+ }
+
if (Grob * f = first_head (me))
{
- Interval head_wid (0, f->extent (f,X_AXIS).length ());
+ Interval head_wid = Note_head::head_extent(f, X_AXIS);
- if (to_boolean (me->get_grob_property ("stem-centered")))
- return gh_double2scm (head_wid.center ());
- Real rule_thick = gh_scm2double (me->get_grob_property ("thickness")) * me->paper_l ()->get_var ("stafflinethickness");
+ Real attach =0.0;
+
+ if (invisible_b (me))
+ {
+ attach = 0.0;
+ }
+ else
+ attach = Note_head::stem_attachment_coordinate(f, X_AXIS);
+
Direction d = get_direction (me);
- r = head_wid[d] - d * rule_thick * 0.5;
+
+ 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 gh_double2scm (r);
}
-
-
Grob*
-Stem::beam_l (Grob*me)
+Stem::get_beam (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)
+Stem::get_stem_info (Grob *me)
{
- Grob * beam = beam_l (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;
+}
- Direction beam_dir = Directional_element_interface::get (beam);
- if (!beam_dir)
+void
+Stem::calc_stem_info (Grob *me)
+{
+ /* 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))
{
- programming_error ("Beam dir not set.");
- beam_dir = UP;
+ 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);
- Real half_space = staff_space / 2;
- int multiplicity = Beam::get_multiplicity (beam);
-
+ 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);
- SCM space_proc = beam->get_grob_property ("space-function");
- SCM space = gh_call1 (space_proc, gh_int2scm (multiplicity));
- Real interbeam_f = gh_scm2double (space) * staff_space;
- Real thick = gh_scm2double (beam->get_grob_property ("thickness"));
- Stem_info info;
- info.idealy_f_ = chord_start_f (me);
+ /* 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;
- // for simplicity, we calculate as if dir == UP
- info.idealy_f_ *= beam_dir;
- SCM grace_prop = me->get_grob_property ("grace");
-
- bool grace_b = to_boolean (grace_prop);
- Array<Real> a;
- SCM s;
+ /* 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;
- s = me->get_grob_property ("beamed-minimum-lengths");
- a.clear ();
- for (SCM q = s; q != SCM_EOL; q = gh_cdr (q))
- a.push (gh_scm2double (gh_car (q)));
+ /* 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 minimum_length = a[multiplicity <? (a.size () - 1)] * staff_space;
- s = me->get_grob_property ("beamed-lengths");
+ Real ideal_minimum_length = ideal_minimum_free
+ + height_of_my_beams
+ /* stem only extends to center of beam */
+ - 0.5 * beam_thickness;
- a.clear ();
- for (SCM q = s; q != SCM_EOL; q = gh_cdr (q))
- a.push (gh_scm2double (gh_car (q)));
+ ideal_length = ideal_length >? ideal_minimum_length;
- Real stem_length = a[multiplicity <? (a.size () - 1)] * staff_space;
-
- if (!beam_dir || (beam_dir == Directional_element_interface::get (me)))
- /* normal beamed stem */
+
+ /* 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 (multiplicity)
- {
- info.idealy_f_ += thick + (multiplicity - 1) * interbeam_f;
- }
- info.miny_f_ = info.idealy_f_;
- info.maxy_f_ = INT_MAX;
+ /* 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);
+ }
- info.idealy_f_ += stem_length;
- info.miny_f_ += minimum_length;
- /*
- lowest beam of (UP) beam must never be lower than second staffline
+ SCM shorten = beam->get_grob_property ("shorten");
+ if (gh_number_p (shorten))
+ ideal_y -= gh_scm2double (shorten);
- 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.miny_f_ =
- info.miny_f_ >? 0
- >? (- 2 * half_space - thick
- + (multiplicity > 0) * thick
- + interbeam_f * (multiplicity - 1));
- }
- }
- else
- /* knee */
- {
- info.idealy_f_ -= thick;
- info.maxy_f_ = info.idealy_f_;
- info.miny_f_ = -INT_MAX;
+ Real minimum_free =
+ gh_scm2double (robust_list_ref
+ (beam_count - 1,
+ me->get_grob_property
+ ("beamed-extreme-minimum-free-lengths")))
+ * staff_space;
- info.idealy_f_ -= stem_length;
- info.maxy_f_ -= minimum_length;
- }
+ 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;
- info.idealy_f_ = (info.maxy_f_ <? info.idealy_f_) >? info.miny_f_;
+ me->set_grob_property ("stem-info",
+ scm_list_n (gh_double2scm (ideal_y),
+ gh_double2scm (shortest_y),
+ SCM_UNDEFINED));
+}
- s = beam->get_grob_property ("shorten");
- if (gh_number_p (s))
- info.idealy_f_ -= gh_scm2double (s);
+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);
- 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));
+ return l;
+}
- info.idealy_f_ += interstaff_f;
- info.miny_f_ += interstaff_f;
- info.maxy_f_ += interstaff_f ;
- return info;
-}
+ADD_INTERFACE (Stem,"stem-interface",
+ "A stem",
+ "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 style no-stem-extend flag-style");
-bool
-Stem::has_interface (Grob*m)
-{
- return m && m->has_interface (ly_symbol2scm ("stem-interface"));
-}
-void
-Stem::set_interface (Grob*me)
-{
- me->set_interface (ly_symbol2scm ("stem-interface"));
-}
projects / lilypond.git / blobdiff