2 clef-engraver.cc -- implement Clef_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>,
8 Mats Bengtsson <matsb@s3.kth.se>
13 #include "translator-group.hh"
14 #include "key-item.hh"
16 #include "staff-symbol-referencer.hh"
18 #include "engraver.hh"
19 #include "direction.hh"
20 #include "side-position-interface.hh"
24 class Clef_engraver : public Engraver
27 TRANSLATOR_DECLARATIONS(Clef_engraver);
29 Direction octave_dir_;
32 virtual void stop_translation_timestep ();
33 virtual void start_translation_timestep ();
34 virtual void process_music ();
35 virtual void acknowledge_grob (Grob_info);
45 void inspect_clef_properties ();
48 Clef_engraver::Clef_engraver ()
55 will trigger a clef at the start since #f != ' ()
57 prev_cpos_ = prev_glyph_ = SCM_BOOL_F;
61 Clef_engraver::set_glyph ()
63 SCM glyph_sym = ly_symbol2scm ("glyph-name");
64 SCM glyph = get_property ("clefGlyph");
66 SCM basic = ly_symbol2scm ("Clef");
68 daddy_trans_l_->execute_single_pushpop_property (basic, glyph_sym, SCM_UNDEFINED);
69 daddy_trans_l_->execute_single_pushpop_property (basic, glyph_sym, glyph);
73 Generate a clef at the start of a measure. (when you see a Bar,
77 Clef_engraver::acknowledge_grob (Grob_info info)
79 Item * item =dynamic_cast <Item *> (info.grob_l_);
82 if (Bar::has_interface (info.grob_l_)
83 && gh_string_p (get_property ("clefGlyph")))
86 if (Key_item::has_interface (item))
89 Key_item adapts its formatting to make sure that the
90 accidentals stay in the upper half of the staff. It needs
91 to know c0-pos for this. (?)
94 item->set_grob_property ("c0-position", get_property ("centralCPosition"));
100 Clef_engraver::create_clef ()
104 Item *c= new Item (get_property ("Clef"));
105 announce_grob (c, 0);
107 Staff_symbol_referencer::set_interface (c);
111 Staff_symbol_referencer::set_position (clef_p_,
112 gh_scm2int (get_property ("clefPosition")));
114 SCM oct = get_property ("clefOctavation");
115 if (gh_number_p (oct) && gh_scm2int (oct))
117 Item * g = new Item (get_property ("OctavateEight"));
119 Side_position_interface::add_support (g,clef_p_);
121 g->set_parent (clef_p_, Y_AXIS);
122 g->set_parent (clef_p_, X_AXIS);
124 g->set_grob_property ("direction", gh_int2scm (sign (gh_scm2int (oct))));
126 announce_grob (octavate_p_, 0);
131 Clef_engraver::process_music ()
133 inspect_clef_properties ();
137 Clef_engraver::inspect_clef_properties ()
139 SCM glyph = get_property ("clefGlyph");
140 SCM clefpos = get_property ("clefPosition");
141 SCM octavation = get_property ("clefOctavation");
142 SCM force_clef = get_property ("forceClef");
144 if (clefpos == SCM_EOL
145 || scm_equal_p (glyph, prev_glyph_) == SCM_BOOL_F
146 || scm_equal_p (clefpos, prev_cpos_) == SCM_BOOL_F
147 || scm_equal_p (octavation, prev_octavation_) == SCM_BOOL_F
148 || to_boolean (force_clef)
154 clef_p_->set_grob_property ("non-default", SCM_BOOL_T);
156 prev_cpos_ = clefpos;
158 prev_octavation_ = octavation;
161 if (to_boolean (force_clef))
163 Translator_group * w = daddy_trans_l_->where_defined (ly_symbol2scm ("forceClef"));
164 w->set_property ("forceClef", SCM_EOL);
170 Clef_engraver::stop_translation_timestep ()
175 if (to_boolean (clef_p_->get_grob_property ("non-default")))
177 vis = get_property ("explicitClefVisibility");
182 clef_p_->set_grob_property ("visibility-lambda", vis);
184 octavate_p_->set_grob_property ("visibility-lambda", vis);
187 typeset_grob (clef_p_);
191 typeset_grob (octavate_p_);
198 Clef_engraver::start_translation_timestep ()
204 ENTER_DESCRIPTION(Clef_engraver,
205 /* descr */ "Determine and set reference point for pitches",
206 /* creats*/ "Clef OctavateEight",
207 /* acks */ "bar-line-interface key-interface",
208 /* reads */ "clefPosition clefGlyph centralCPosition clefOctavation explicitClefVisibility",