X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstem.cc;h=e1b53608c82bf03420f1756dc4bc643e4319a36c;hb=c5f04d22f8ad2b8735c6cfec69b8138f185752af;hp=a6ca3d3df5d3d08c4bbd769b604f666faedb3a72;hpb=163503e56aa0c03d41d37fd083bdb96a6a473a11;p=lilypond.git diff --git a/lily/stem.cc b/lily/stem.cc index a6ca3d3df5..7a63f20b7c 100644 --- a/lily/stem.cc +++ b/lily/stem.cc @@ -3,501 +3,952 @@ source file of the GNU LilyPond music typesetter - (c) 1996, 1997--1999 Han-Wen Nienhuys + (c) 1996--2003 Han-Wen Nienhuys Jan Nieuwenhuizen TODO: This is way too hairy + + TODO: fix naming. + + Stem-end, chord-start, etc. is all confusing naming. */ -#include "dimension-cache.hh" + +#include // 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 "cross-staff.hh" #include "staff-symbol-referencer.hh" +#include "spanner.hh" +#include "side-position-interface.hh" +#include "dot-column.hh" -Stem::Stem () -{ - beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1; -} - -Interval_t -Stem::head_positions () const +void +Stem::set_beaming (Grob*me, int beam_count, Direction d) { - /* - Mysterious FreeBSD fix by John Galbraith. Somehow, the empty intervals - trigger FP exceptions on FreeBSD. Fix: do not return infinity - - */ - if (!first_head ()) + SCM pair = me->get_grob_property ("beaming"); + + if (!gh_pair_p (pair)) { - return Interval_t (100,-100); + pair = gh_cons (SCM_EOL, SCM_EOL); + me->set_grob_property ("beaming", pair); } - Link_array head_l_arr = - Group_interface__extract_elements (this, (Note_head*)0, "heads"); - - Interval_t r; - for (int i =0; i < head_l_arr.size (); i++) + SCM l = index_get_cell (pair, d); + for( int i = 0; i< beam_count; i++) { - Staff_symbol_referencer_interface si (head_l_arr[i]); - int p = (int)si.position_f (); - r[BIGGER] = r[BIGGER] >? p; - r[SMALLER] = r[SMALLER] e (extremal_heads (me)); + + return Interval (Staff_symbol_referencer::get_position (e[DOWN]), + Staff_symbol_referencer::get_position (e[UP])); } + Real -Stem::stem_begin_f () const +Stem::chord_start_y (Grob*me) { - return yextent_[Direction(-get_direction ())]; + return head_positions (me)[get_direction (me)] + * Staff_symbol_referencer::staff_space (me)/2.0; } Real -Stem::chord_start_f () const +Stem::stem_end_position (Grob*me) { - return head_positions()[get_direction ()] - * Staff_symbol_referencer_interface (this).staff_line_leading_f ()/2.0; + 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); + + return pos; } -Real -Stem::stem_end_f () const +Direction +Stem::get_direction (Grob*me) { - return yextent_[get_direction ()]; + 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::set_stemend (Real se) +Stem::set_stemend (Grob*me, Real se) { // todo: margins - if (get_direction () && get_direction () * head_positions()[get_direction ()] >= se*get_direction ()) - warning (_ ("Weird stem size; check for narrow beams")); - + Direction d= get_direction (me); - yextent_[get_direction ()] = se; - yextent_[Direction(-get_direction ())] = head_positions()[-get_direction ()]; + 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)); +} + + +/* + Note head that determines hshift for upstems + + WARNING: triggers direction +*/ +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 (head_count (me) == 1) + { + /* + UGH. + */ + + return unsmob_grob (ly_car (me->get_grob_property ("note-heads"))); + } + else + return first_head (me); } + int -Stem::type_i () const +Stem::head_count (Grob*me) { - return first_head ()->balltype_i (); + return Pointer_group_interface::count (me, "note-heads"); } -Note_head* -Stem::first_head () const +/* + The note head which forms one end of the stem. + + WARNING: triggers direction +*/ +Grob* +Stem::first_head (Grob*me) { - SCM h =get_elt_property ("heads"); - if (!gh_pair_p (h)) + Direction d = get_direction (me); + if (!d) return 0; + return extremal_heads (me)[-d]; +} - Score_element * sc = unsmob_element (gh_car (h)); - - return dynamic_cast (sc); +/* + 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]; } -void -Stem::add_head (Rhythmic_head *n) +/* + START is part where stem reaches `last' head. + */ +Drul_array +Stem::extremal_heads (Grob*me) { - n->set_elt_property ("stem", this->self_scm_); - n->add_dependency (this); // ? + const int inf = 1000000; + Drul_array extpos; + extpos[DOWN] = inf; + extpos[UP] = -inf; + + Drul_array exthead; + exthead[LEFT] = exthead[RIGHT] =0; + for (SCM s = me->get_grob_property ("note-heads"); gh_pair_p (s); s = ly_cdr (s)) + { + Grob * n = unsmob_grob (ly_car (s)); - Group_interface gi (this); - if (Note_head *nh = dynamic_cast (n)) - gi.name_ = "heads"; - else - gi.name_ = "rests"; + + 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); + } - gi.add_element (n); + return exthead; } -bool -Stem::invisible_b () const +static int +icmp (int const &a, int const &b) { - return !(first_head () && first_head()->balltype_i () >= 1); + return a-b; } -int -Stem::get_center_distance (Direction d) const +Array +Stem::note_head_positions (Grob *me) { - int staff_center = 0; - int distance = d*(head_positions()[d] - staff_center); - return distance >? 0; + Array 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; } -Direction -Stem::get_default_dir () const + +void +Stem::add_head (Grob*me, Grob *n) { - int du = get_center_distance (UP); - int dd = get_center_distance (DOWN); + n->set_grob_property ("stem", me->self_scm ()); + n->add_dependency (me); - if (sign (dd - du)) - return Direction (sign (dd -du)); + if (Note_head::has_interface (n)) + { + Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-heads"), n); + } +} - return Direction (int(paper_l ()->get_var ("stem_default_neutral_direction"))); +bool +Stem::invisible_b (Grob*me) +{ + return ! (head_count (me) + && gh_scm2int (me->get_grob_property ("duration-log")) >= 1); } -void -Stem::set_default_stemlen () +Direction +Stem::get_default_dir (Grob*me) +{ + 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 ("neutral-direction")); +} + +Real +Stem::get_default_stem_end_position (Grob*me) { - Real length_f = 0.; - SCM scm_len = get_elt_property("length"); - if (scm_len != SCM_UNDEFINED) + /* 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 a; + + Real length_f = 3.5; + SCM scm_len = me->get_grob_property ("length"); + if (gh_number_p (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_UNDEFINED; - 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 (!get_direction ()) - set_direction (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 ()) - && (get_direction () != get_default_dir ())) - length_f -= shorten_f; - - if (flag_i () >= 5) - length_f += 2.0; - if (flag_i () >= 6) - length_f += 1.0; + Direction dir = get_direction (me); + if (!dir) + { + dir = get_default_dir (me); + Directional_element_interface::set (me, dir); + } - set_stemend ((get_direction () > 0) ? head_positions()[BIGGER] + length_f: - head_positions()[SMALLER] - length_f); + /* 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; - bool no_extend_b = get_elt_property ("no-stem-extend") != SCM_UNDEFINED; - if (!grace_b && !no_extend_b && (get_direction () * stem_end_f () < 0)) - set_stemend (0); -} + 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; -int -Stem::flag_i () const -{ - SCM s = get_elt_property ("duration-log"); - return (gh_number_p (s)) ? gh_scm2int (s) : 2; + 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. + */ + } + } + } + } + + + 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 (!first_head ()) + if (!head_count (me)) return; + + Link_array heads = + Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-heads"); + heads.sort (compare_position); + Direction dir =get_direction (me); - Link_array head_l_arr = - Group_interface__extract_elements (this, (Note_head*)0, "heads"); + if (dir < 0) + heads.reverse (); - head_l_arr.sort (Note_head::compare); - if (get_direction () < 0) - head_l_arr.reverse (); - Note_head * beginhead = first_head (); - beginhead->set_elt_property ("extremal", SCM_BOOL_T); - if (beginhead != head_l_arr.top ()) - head_l_arr.top ()->set_elt_property ("extremal", SCM_BOOL_T); + 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); + } - int parity=1; - int lastpos = int (Staff_symbol_referencer_interface (beginhead).position_f ()); - for (int i=1; i < head_l_arr.size (); i ++) + 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 ++) { - Real p = Staff_symbol_referencer_interface (head_l_arr[i]).position_f (); + 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 (get_direction ()); + { + 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; + 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_.empty_b ()) - 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)) { - set_elt_property ("transparent", SCM_BOOL_T); - set_empty (Y_AXIS); - set_empty (X_AXIS); + stem_end_position (me); // ugh. Trigger direction calc. + position_noteheads (me); } - - - set_spacing_hints (); + else + { + me->set_grob_property ("molecule-callback", SCM_EOL); + } + + 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 (get_direction ()); - SCM dirlist = column_l ()->get_elt_property ("dir-list"); - if (dirlist == SCM_UNDEFINED) - dirlist = SCM_EOL; + 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", 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"); - if ( st != SCM_UNDEFINED) + 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 ()) { - 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 = (get_direction () == 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::dim_callback (Dimension_cache const* c) +MAKE_SCHEME_CALLBACK (Stem,dim_callback,2); +SCM +Stem::dim_callback (SCM e, SCM ax) { - Stem * s = dynamic_cast (c->element_l ()); - + Axis a = (Axis) gh_scm2int (ax); + assert (a == X_AXIS); + Grob *se = unsmob_grob (e); Interval r (0, 0); - if (s->get_elt_property ("beam") != SCM_UNDEFINED || abs (s->flag_i ()) <= 2) + if (unsmob_grob (se->get_grob_property ("beam")) || abs (duration_log (se)) <= 2) ; // TODO! else { - r = s->flag ().dim_.x (); - r += s->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; - Interval stem_y = yextent_; - Real dy = staff_symbol_referencer_interface (this) - .staff_line_leading_f ()/2.0; - - Real head_wid = 0; - if (first_head ()) - head_wid = first_head ()->extent (X_AXIS).length (); - stem_y[Direction(-get_direction ())] += get_direction () * 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"))) + { + Grob * lh = last_head (me); + if (!lh) + return SCM_EOL; + y1 = Staff_symbol_referencer::get_position (lh); + } + else { - 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 = 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 ? y1); - if (get_elt_property ("beam") == SCM_UNDEFINED - && 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[get_direction ()]*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 (first_head ()) + 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 (first_head ()) + + if (head_count (me) == 0) + { + return gh_double2scm (0.0); + } + + if (Grob * f = first_head (me)) { - Interval head_wid(0, first_head()->extent (X_AXIS).length ()); - Real rule_thick = paper_l ()->get_var ("stemthickness"); + Interval head_wid = Note_head::head_extent(f, X_AXIS); - Interval stem_wid(-rule_thick/2, rule_thick/2); - if (get_direction () == CENTER) - r = head_wid.center (); + + Real attach =0.0; + + if (invisible_b (me)) + { + attach = 0.0; + } else - r = head_wid[get_direction ()] - stem_wid[get_direction ()]; - } - return r; -} + attach = Note_head::stem_attachment_coordinate(f, X_AXIS); -Real -Stem::hpos_f () const -{ - return note_delta_f () + Item::hpos_f (); -} + Direction d = get_direction (me); + Real real_attach = head_wid.linear_combination (d * attach); -Beam* -Stem::beam_l ()const -{ - SCM b= get_elt_property ("beam"); - return dynamic_cast (unsmob_element (b)); + 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::get_beam (Grob*me) +{ + SCM b= me->get_grob_property ("beam"); + return unsmob_grob (b); +} Stem_info -Stem::calc_stem_info () const +Stem::get_stem_info (Grob *me) { - assert (beam_l ()); - - SCM bd = get_elt_property ("beam-dir"); - Real internote_f - = staff_symbol_referencer_interface (this).staff_line_leading_f ()/2; - - Direction beam_dir; - Stem_info info; - - if (isdir_b (bd)) + /* Return cached info if available */ + SCM scm_info = me->get_grob_property ("stem-info"); + if (!gh_pair_p (scm_info)) { - beam_dir = to_dir (bd); + calc_stem_info (me); + scm_info = me->get_grob_property ("stem-info"); } - else + + 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::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 direction not set."); - beam_dir = UP; // GURAUGRNAGURAGU! urg ! + 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; } - - Real interbeam_f = paper_l ()->interbeam_f (beam_l ()->multiplicity_i_); - Real beam_f = gh_scm2double (beam_l ()->get_elt_property ("beam-thickness")); - - info.idealy_f_ = chord_start_f (); - // for simplicity, we calculate as if dir == UP - info.idealy_f_ *= beam_dir; + 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); - bool grace_b = get_elt_property ("grace") != SCM_UNDEFINED; - bool no_extend_b = get_elt_property ("no-stem-extend") != SCM_UNDEFINED; - int stem_max = (int)rint(paper_l ()->get_var ("stem_max")); - String type_str = grace_b ? "grace_" : ""; - Real min_stem_f = paper_l ()->get_var (type_str + "minimum_stem_length" - + to_str (beam_l ()->multiplicity_i_ get_var (type_str + "stem_length" - + to_str (beam_l ()->multiplicity_i_ get_grob_property ("beamed-lengths"))) + * staff_space + /* stem only extends to center of beam */ + - 0.5 * beam_thickness; - if (!beam_dir || (beam_dir == get_direction ())) - /* normal beamed stem */ - { - if (beam_l ()->multiplicity_i_) - { - info.idealy_f_ += beam_f; - info.idealy_f_ += (beam_l ()->multiplicity_i_ - 1) * interbeam_f; - } - info.miny_f_ = info.idealy_f_; - info.maxy_f_ = INT_MAX; + + /* 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; + - info.idealy_f_ += stem_f; - info.miny_f_ += min_stem_f; + /* 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; - /* - lowest beam of (UP) beam must never be lower than second staffline + Real ideal_minimum_length = ideal_minimum_free + + height_of_my_beams + /* stem only extends to center of beam */ + - 0.5 * beam_thickness; - Hmm, reference (Wanske?) + 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; - 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. - - */ - if (!grace_b && !no_extend_b) - { - //highest beam of (UP) beam must never be lower than middle staffline - info.miny_f_ = info.miny_f_ >? 0; - //lowest beam of (UP) beam must never be lower than second staffline - info.miny_f_ = info.miny_f_ >? (- 2 * internote_f - beam_f - + (beam_l ()->multiplicity_i_ > 0) * beam_f + interbeam_f * (beam_l ()->multiplicity_i_ - 1)); - } - } - else - /* knee */ - { - info.idealy_f_ -= beam_f; - info.maxy_f_ = info.idealy_f_; - info.miny_f_ = -INT_MAX; - info.idealy_f_ -= stem_f; - info.maxy_f_ -= min_stem_f; + /* 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) + { + /* 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_ = info.maxy_f_ ? info.idealy_f_; - Real interstaff_f = calc_interstaff_dist (this, beam_l ()); - info.idealy_f_ += interstaff_f * beam_dir; + 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)); +} - SCM s = get_elt_property ("shorten"); - if (s != SCM_UNDEFINED) - info.idealy_f_ -= gh_double2scm (s); - info.miny_f_ += interstaff_f * beam_dir; - info.maxy_f_ += interstaff_f * beam_dir; +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 info; + 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"); + +