2 clef-engraver.cc -- implement Clef_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>,
8 Mats Bengtsson <matsb@s3.kth.se>
13 #include "staff-symbol-referencer.hh"
15 #include "command-request.hh"
17 #include "engraver.hh"
18 #include "direction.hh"
19 #include "side-position-interface.hh"
22 /// where is c-0 in the staff?
23 class Clef_engraver : public Engraver {
26 Clef_change_req * clef_req_l_;
29 bool set_type (String);
31 virtual void do_process_music();
32 virtual void do_pre_move_processing();
33 virtual void do_creation_processing();
34 virtual void do_post_move_processing();
35 virtual bool do_try_music (Music*);
36 virtual void acknowledge_element (Score_element_info);
38 VIRTUAL_COPY_CONS(Translator);
42 Direction octave_dir_;
43 SCM clef_glyph_; // no need for protection. Always referenced somewhere else.
49 Protected_scm current_settings_;
53 Clef_engraver::Clef_engraver()
55 current_settings_ = SCM_EOL;
58 clef_glyph_ = SCM_EOL;
68 Clef_engraver::set_type (String s)
70 if (s.right_str(2) == "_8") // Down one octave
73 s = s.left_str(s.length_i() - 2);
75 else if (s.right_str(2) == "^8") // Up one octave
78 s = s.left_str(s.length_i() - 2);
83 SCM c = get_property ("supportedClefTypes");
84 SCM p = get_property ("clefPitches");
88 SCM found = scm_assoc (ly_str02scm (s.ch_C()), c);
89 if (found == SCM_BOOL_F)
92 clef_glyph_ = gh_cadr (found);
93 SCM pos = gh_caddr (found);
95 clef_position_i_ = gh_scm2int (pos);
97 found = scm_assoc (clef_glyph_, p);
98 if (found == SCM_BOOL_F)
101 c0_position_i_ = clef_position_i_ + gh_scm2int (gh_cdr (found));
104 c0_position_i_ -= (int) octave_dir_ * 7;
106 SCM basic = get_property ("basicClefItemProperties");
107 current_settings_ = gh_cons (gh_cons (ly_symbol2scm ("glyph"), clef_glyph_), basic);
109 gh_cons (gh_cons (ly_symbol2scm ("c0-position"),
110 gh_int2scm (c0_position_i_)),
117 Generate a clef at the start of a measure. (when you see a Bar,
121 Clef_engraver::acknowledge_element (Score_element_info info)
123 Item * item =dynamic_cast <Item *> (info.elem_l_);
126 if (to_boolean (info.elem_l_->get_elt_property ("bar-interface"))
127 && gh_string_p (clef_glyph_))
131 if (to_boolean (item->get_elt_property("note-head-interface"))
132 || to_boolean (item->get_elt_property ("accidentals-interface")))
134 Staff_symbol_referencer_interface si (item);
135 si.set_position (int (si.position_f ()) + c0_position_i_);
137 else if (to_boolean (item->get_elt_property ("key-item-interface")))
139 item->set_elt_property ("c0-position", gh_int2scm (c0_position_i_));
145 Clef_engraver::do_creation_processing()
147 SCM def = get_property ("defaultClef");
148 if (gh_string_p (def))
150 set_type (ly_scm2string (def));
155 Clef_engraver::do_try_music (Music * r_l)
157 if (Clef_change_req *cl = dynamic_cast <Clef_change_req *> (r_l))
160 if (!set_type (cl->clef_str_))
161 cl->error (_ ("unknown clef type"));
171 Clef_engraver::create_clef()
175 Item *c= new Item ( current_settings_);
176 announce_element (Score_element_info (c, clef_req_l_));
178 Staff_symbol_referencer_interface::set_interface (c);
182 Staff_symbol_referencer_interface si(clef_p_);
184 si.set_position (clef_position_i_);
187 Item * g = new Item (get_property ("basicOctavateEightProperties"));
188 Side_position_interface spi (g);
189 spi.set_axis (Y_AXIS);
190 spi.add_support (clef_p_);
191 g->set_parent (clef_p_, Y_AXIS);
192 g->set_parent (clef_p_, X_AXIS);
193 g->add_offset_callback (Side_position_interface::aligned_on_self, X_AXIS);
194 g->add_offset_callback (Side_position_interface::centered_on_parent, X_AXIS);
195 g->set_elt_property ("direction", gh_int2scm (octave_dir_));
197 announce_element (Score_element_info (octavate_p_, clef_req_l_));
203 Clef_engraver::do_process_music()
205 if (clef_req_l_ || first_b_)
208 clef_p_->set_elt_property ("non-default", SCM_BOOL_T);
213 Clef_engraver::do_pre_move_processing()
218 if(to_boolean (clef_p_->get_elt_property("non-default")))
220 vis = ly_symbol2scm ("all-visible");
221 vis = scm_eval (vis);
226 clef_p_->set_elt_property("visibility-lambda", vis);
228 octavate_p_->set_elt_property("visibility-lambda", vis);
231 typeset_element (clef_p_);
235 typeset_element(octavate_p_);
244 Clef_engraver::do_post_move_processing()
249 ADD_THIS_TRANSLATOR(Clef_engraver);