2 key-item.cc -- implement Key_signature_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 keyplacement by Mats Bengtsson
14 #include "output-def.hh"
15 #include "font-interface.hh"
16 #include "staff-symbol-referencer.hh"
18 #include "lily-guile.hh"
19 #include "lily-proto.hh"
20 #include "accidental-interface.hh"
22 struct Key_signature_interface
24 DECLARE_SCHEME_CALLBACK (print, (SCM ));
26 static bool has_interface (Grob*);
31 FIXME: too much hardcoding here.
33 const int FLAT_TOP_PITCH=2; /* fes,ges,as and bes typeset in lower octave */
34 const int SHARP_TOP_PITCH=4; /* ais and bis typeset in lower octave */
37 TODO: look this up. I'm not sure where the naturals ought to go.
39 const int NATURAL_TOP_PITCH = 4;
45 FIXME: key-item should just get a list of (position, acc), and leave
46 the thinking to other parties.
48 - TODO: put this in Scheme
50 TODO: can we do without c0pos? it's partly musical.
54 alteration_pos (SCM what, int alter, int c0p)
56 if (scm_is_pair (what))
57 return scm_to_int (scm_car (what)) * 7 + scm_to_int (scm_cdr (what)) + c0p;
59 int p = scm_to_int (what);
61 // Find the c in the range -4 through 2
62 int from_bottom_pos = c0p + 4;
63 from_bottom_pos = from_bottom_pos%7;
64 from_bottom_pos = (from_bottom_pos + 7)%7; // Precaution to get positive.
65 int c0 = from_bottom_pos - 4;
68 if ((alter <0 && ((p>FLAT_TOP_PITCH) || (p+c0>4)) && (p+c0>1))
69 || (alter >0 && ((p > SHARP_TOP_PITCH) || (p+c0>5)) && (p+c0>2))
70 || (alter == 0 && ((p > NATURAL_TOP_PITCH) || (p + c0>5)) && (p + c0>2)))
72 p -= 7; /* Typeset below c_position */
75 /* Provide for the four cases in which there's a glitch
76 it's a hack, but probably not worth
77 the effort of finding a nicer solution.
79 if (c0==2 && alter >0 && p==3)
81 if (c0==-3 && alter>0 && p==-1)
83 if (c0==-4 && alter<0 && p==-1)
85 if (c0==-2 && alter<0 && p==-3)
93 - space the `natural' signs wider
95 MAKE_SCHEME_CALLBACK (Key_signature_interface,print,1);
97 Key_signature_interface::print (SCM smob)
99 Grob*me =unsmob_grob (smob);
101 Real inter = Staff_symbol_referencer::staff_space (me)/2.0;
103 SCM scm_style = me->get_property ("style");
105 if (scm_is_symbol (scm_style))
107 style = ly_symbol2string (scm_style);
114 SCM newas = me->get_property ("new-accidentals");
117 SCM c0s = me->get_property ("c0-position");
119 if (scm_is_number (c0s))
120 c0p = scm_to_int (c0s);
123 SCM lists are stacks, so we work from right to left, ending with
124 the cancellation signature.
127 Font_metric *fm = Font_interface::get_default_font (me);
128 for (SCM s = newas; scm_is_pair (s); s = scm_cdr (s))
130 int alteration = scm_to_int (scm_cdar (s));
132 Accidental_interface::get_fontcharname (style, alteration);
133 Stencil acc (fm->find_by_name ("accidentals-" + font_char));
137 me->warning (_f ("accidental `%s' not found", font_char));
141 SCM what = scm_caar (s);
142 int pos = alteration_pos (what, alteration, c0p);
143 acc.translate_axis (pos * inter, Y_AXIS);
144 mol.add_at_edge (X_AXIS, LEFT, acc, 0, 0);
148 Item *it = dynamic_cast<Item*> (me) ;
149 if (it->break_status_dir () != RIGHT)
151 SCM old = me->get_property ("old-accidentals");
154 if (scm_is_pair (old))
155 natural=Font_interface::get_default_font (me)->
156 find_by_name (String ("accidentals-") + style + String ("0"));
160 for (; scm_is_pair (old); old = scm_cdr (old))
162 SCM found = scm_assoc (scm_caar (old), newas);
163 if (found == SCM_BOOL_F
164 || scm_cdr (found) != scm_cdar (old))
166 SCM what = scm_caar (old);
168 int pos = alteration_pos (what, alteration, c0p);
171 m.translate_axis (pos* inter, Y_AXIS);
174 The natural sign (unlike flat & sharp)
175 has vertical edges on both sides. A little padding is
176 needed to prevent collisions.
179 if (last_pos < pos + 2
180 && last_pos> pos - 6)
183 mol.add_at_edge (X_AXIS, LEFT, m, padding, 0);
189 mol.align_to (X_AXIS, LEFT);
191 return mol.smobbed_copy ();
194 ADD_INTERFACE (Key_signature_interface, "key-signature-interface",
195 "A group of accidentals, to be printed as signature sign.",
196 "style c0-position old-accidentals new-accidentals");