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
12 #include "output-def.hh"
13 #include "font-interface.hh"
14 #include "staff-symbol-referencer.hh"
16 #include "accidental-interface.hh"
18 struct Key_signature_interface
20 DECLARE_SCHEME_CALLBACK (print, (SCM ));
22 static bool has_interface (Grob*);
27 FIXME: too much hardcoding here.
29 const int FLAT_TOP_PITCH =2; /* fes,ges,as and bes typeset in lower octave */
30 const int SHARP_TOP_PITCH =4; /* ais and bis typeset in lower octave */
33 TODO: look this up. I'm not sure where the naturals ought to go.
35 const int NATURAL_TOP_PITCH = 4;
41 FIXME: key-item should just get a list of (position, acc), and leave
42 the thinking to other parties.
44 - TODO: put this in Scheme
46 TODO: can we do without c0pos? it's partly musical.
50 alteration_pos (SCM what, int alter, int c0p)
52 if (scm_is_pair (what))
53 return scm_to_int (scm_car (what)) * 7 + scm_to_int (scm_cdr (what)) + c0p;
55 int p = scm_to_int (what);
57 // Find the c in the range -4 through 2
58 int from_bottom_pos = c0p + 4;
59 from_bottom_pos = from_bottom_pos%7;
60 from_bottom_pos = (from_bottom_pos + 7)%7; // Precaution to get positive.
61 int c0 = from_bottom_pos - 4;
64 if ((alter <0 && ((p>FLAT_TOP_PITCH) || (p+c0>4)) && (p+c0>1))
65 || (alter >0 && ((p > SHARP_TOP_PITCH) || (p+c0>5)) && (p+c0>2))
66 || (alter == 0 && ((p > NATURAL_TOP_PITCH) || (p + c0>5)) && (p + c0>2)))
68 p -= 7; /* Typeset below c_position */
71 /* Provide for the four cases in which there's a glitch
72 it's a hack, but probably not worth
73 the effort of finding a nicer solution.
75 if (c0==2 && alter >0 && p ==3)
77 if (c0==-3 && alter>0 && p ==-1)
79 if (c0==-4 && alter<0 && p ==-1)
81 if (c0==-2 && alter<0 && p ==-3)
89 - space the `natural' signs wider
91 MAKE_SCHEME_CALLBACK (Key_signature_interface,print,1);
93 Key_signature_interface::print (SCM smob)
95 Grob*me = unsmob_grob (smob);
97 Real inter = Staff_symbol_referencer::staff_space (me)/2.0;
99 SCM scm_style = me->get_property ("style");
101 if (scm_is_symbol (scm_style))
103 style = ly_symbol2string (scm_style);
110 SCM newas = me->get_property ("new-accidentals");
113 SCM c0s = me->get_property ("c0-position");
115 if (scm_is_number (c0s))
116 c0p = scm_to_int (c0s);
119 SCM lists are stacks, so we work from right to left, ending with
120 the cancellation signature.
123 Font_metric *fm = Font_interface::get_default_font (me);
124 for (SCM s = newas; scm_is_pair (s); s = scm_cdr (s))
126 int alteration = scm_to_int (scm_cdar (s));
128 Accidental_interface::get_fontcharname (style, alteration);
129 Stencil acc (fm->find_by_name ("accidentals." + font_char));
133 me->warning (_f ("accidental `%s' not found", font_char));
137 SCM what = scm_caar (s);
138 int pos = alteration_pos (what, alteration, c0p);
139 acc.translate_axis (pos * inter, Y_AXIS);
140 mol.add_at_edge (X_AXIS, LEFT, acc, 0, 0);
144 Item *it = dynamic_cast<Item*> (me) ;
145 if (it->break_status_dir () != RIGHT)
147 SCM old = me->get_property ("old-accidentals");
150 if (scm_is_pair (old))
151 natural = Font_interface::get_default_font (me)->
152 find_by_name (String ("accidentals.") + style + String ("0"));
156 for (; scm_is_pair (old); old = scm_cdr (old))
158 SCM found = scm_assoc (scm_caar (old), newas);
159 if (found == SCM_BOOL_F
160 || scm_cdr (found) != scm_cdar (old))
162 SCM what = scm_caar (old);
164 int pos = alteration_pos (what, alteration, c0p);
167 m.translate_axis (pos* inter, Y_AXIS);
170 The natural sign (unlike flat & sharp)
171 has vertical edges on both sides. A little padding is
172 needed to prevent collisions.
175 if (last_pos < pos + 2
176 && last_pos> pos - 6)
179 mol.add_at_edge (X_AXIS, LEFT, m, padding, 0);
185 mol.align_to (X_AXIS, LEFT);
187 return mol.smobbed_copy ();
190 ADD_INTERFACE (Key_signature_interface, "key-signature-interface",
191 "A group of accidentals, to be printed as signature sign.",
192 "style c0-position old-accidentals new-accidentals");