3 clef-engraver.cc -- implement Clef_engraver
5 source file of the GNU LilyPond music typesetter
7 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>,
9 Mats Bengtsson <matsb@s3.kth.se>
14 #include "key-item.hh"
15 #include "local-key-item.hh"
17 #include "note-head.hh"
18 #include "staff-symbol-referencer.hh"
20 #include "command-request.hh"
22 #include "engraver.hh"
23 #include "direction.hh"
24 #include "side-position-interface.hh"
27 /// where is c-0 in the staff?
28 class Clef_engraver : public Engraver {
31 Clef_change_req * clef_req_l_;
34 bool set_type (String);
36 virtual void do_process_music();
37 virtual void do_pre_move_processing();
38 virtual void do_creation_processing();
39 virtual void do_post_move_processing();
40 virtual bool do_try_music (Music*);
41 virtual void acknowledge_element (Score_element_info);
43 VIRTUAL_COPY_CONS(Translator);
47 Direction octave_dir_;
48 SCM clef_glyph_; // no need for protection. Always referenced somewhere else.
54 Protected_scm current_settings_;
58 Clef_engraver::Clef_engraver()
60 current_settings_ = SCM_EOL;
63 clef_glyph_ = SCM_EOL;
73 Clef_engraver::set_type (String s)
75 if (s.right_str(2) == "_8") // Down one octave
78 s = s.left_str(s.length_i() - 2);
80 else if (s.right_str(2) == "^8") // Up one octave
83 s = s.left_str(s.length_i() - 2);
88 SCM c = get_property ("supportedClefTypes");
89 SCM p = get_property ("clefPitches");
93 SCM found = scm_assoc (ly_str02scm (s.ch_C()), c);
94 if (found == SCM_BOOL_F)
97 clef_glyph_ = gh_cadr (found);
98 SCM pos = gh_caddr (found);
100 clef_position_i_ = gh_scm2int (pos);
102 found = scm_assoc (clef_glyph_, p);
103 if (found == SCM_BOOL_F)
106 c0_position_i_ = clef_position_i_ + gh_scm2int (gh_cdr (found));
109 c0_position_i_ -= (int) octave_dir_ * 7;
111 SCM basic = get_property ("basicClefItemProperties");
112 current_settings_ = gh_cons (gh_cons (ly_symbol2scm ("glyph"), clef_glyph_), basic);
114 gh_cons (gh_cons (ly_symbol2scm ("c0-position"),
115 gh_int2scm (c0_position_i_)),
122 Generate a clef at the start of a measure. (when you see a Bar,
126 Clef_engraver::acknowledge_element (Score_element_info info)
128 Item * item =dynamic_cast <Item *> (info.elem_l_);
131 if (Bar::has_interface (info.elem_l_)
132 && gh_string_p (clef_glyph_))
136 if (Note_head::has_interface (item)
137 || Local_key_item::has_interface (item))
139 int p = int (Staff_symbol_referencer::position_f (item)) + c0_position_i_;
140 Staff_symbol_referencer::set_position (item,p);
143 else if (Key_item::has_interface (item))
145 item->set_elt_property ("c0-position", gh_int2scm (c0_position_i_));
151 Clef_engraver::do_creation_processing()
153 SCM def = get_property ("defaultClef");
154 if (gh_string_p (def))
156 set_type (ly_scm2string (def));
161 Clef_engraver::do_try_music (Music * r_l)
163 if (Clef_change_req *cl = dynamic_cast <Clef_change_req *> (r_l))
166 if (!set_type (cl->clef_str_))
167 cl->error (_ ("unknown clef type"));
177 Clef_engraver::create_clef()
181 Item *c= new Item ( current_settings_);
182 announce_element (Score_element_info (c, clef_req_l_));
184 Staff_symbol_referencer::set_interface (c);
188 Staff_symbol_referencer::set_position(clef_p_, clef_position_i_);
191 Item * g = new Item (get_property ("basicOctavateEightProperties"));
192 Side_position::set_axis (g,Y_AXIS);
193 Side_position::add_support (g,clef_p_);
195 g->set_parent (clef_p_, Y_AXIS);
196 g->set_parent (clef_p_, X_AXIS);
197 g->add_offset_callback (Side_position::aligned_on_self, X_AXIS);
198 g->add_offset_callback (Side_position::centered_on_parent, X_AXIS);
199 g->set_elt_property ("direction", gh_int2scm (octave_dir_));
201 announce_element (Score_element_info (octavate_p_, clef_req_l_));
207 Clef_engraver::do_process_music()
209 if (clef_req_l_ || first_b_)
212 clef_p_->set_elt_property ("non-default", SCM_BOOL_T);
217 Clef_engraver::do_pre_move_processing()
222 if(to_boolean (clef_p_->get_elt_property("non-default")))
224 vis = ly_symbol2scm ("all-visible");
225 vis = scm_eval (vis);
230 clef_p_->set_elt_property("visibility-lambda", vis);
232 octavate_p_->set_elt_property("visibility-lambda", vis);
235 typeset_element (clef_p_);
239 typeset_element(octavate_p_);
248 Clef_engraver::do_post_move_processing()
253 ADD_THIS_TRANSLATOR(Clef_engraver);