2 key-item.cc -- implement Key_signature_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2005 Han-Wen Nienhuys <hanwen@xs4all.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 *);
26 FIXME: too much hardcoding here.
28 const int FLAT_TOP_PITCH = 2; /* fes, ges, as and bes typeset in lower octave */
29 const int SHARP_TOP_PITCH = 4; /* ais and bis typeset in lower octave */
32 TODO: look this up. I'm not sure where the naturals ought to go.
34 const int NATURAL_TOP_PITCH = 4;
37 FIXME: key-item should just get a list of (position, acc), and leave
38 the thinking to other parties.
40 - TODO: put this in Scheme
42 TODO: can we do without c0pos? it's partly musical.
45 alteration_pos (SCM what, int alter, int c0p)
47 if (scm_is_pair (what))
48 return scm_to_int (scm_car (what)) * 7 + scm_to_int (scm_cdr (what)) + c0p;
50 int p = scm_to_int (what);
52 // Find the c in the range -4 through 2
53 int from_bottom_pos = c0p + 4;
54 from_bottom_pos = from_bottom_pos % 7;
55 from_bottom_pos = (from_bottom_pos + 7) % 7; // Precaution to get positive.
56 int c0 = from_bottom_pos - 4;
58 if ((alter < 0 && ((p > FLAT_TOP_PITCH) || (p + c0 > 4)) && (p + c0 > 1))
59 || (alter > 0 && ((p > SHARP_TOP_PITCH) || (p + c0 > 5)) && (p + c0 > 2))
60 || (alter == 0 && ((p > NATURAL_TOP_PITCH) || (p + c0 > 5)) && (p + c0 > 2)))
62 p -= 7; /* Typeset below c_position */
65 /* Provide for the four cases in which there's a glitch
66 it's a hack, but probably not worth
67 the effort of finding a nicer solution.
69 if (c0 == 2 && alter > 0 && p == 3)
71 if (c0==-3 && alter > 0 && p ==-1)
73 if (c0==-4 && alter < 0 && p ==-1)
75 if (c0==-2 && alter < 0 && p ==-3)
83 - space the `natural' signs wider
85 MAKE_SCHEME_CALLBACK (Key_signature_interface, print, 1);
87 Key_signature_interface::print (SCM smob)
89 Item *me = dynamic_cast<Item *> (unsmob_grob (smob));
91 Real inter = Staff_symbol_referencer::staff_space (me) / 2.0;
93 SCM scm_style = me->get_property ("style");
95 if (scm_is_symbol (scm_style))
96 style = ly_symbol2string (scm_style);
100 SCM newas = me->get_property ("alteration-alist");
103 SCM c0s = me->get_property ("c0-position");
105 if (scm_is_number (c0s))
106 c0p = scm_to_int (c0s);
109 SCM lists are stacks, so we work from right to left, ending with
110 the cancellation signature.
113 int last_pos = -1000;
114 Font_metric *fm = Font_interface::get_default_font (me);
115 for (SCM s = newas; scm_is_pair (s); s = scm_cdr (s))
117 int alteration = scm_to_int (scm_cdar (s));
119 = Accidental_interface::get_fontcharname (style, alteration);
120 Stencil acc (fm->find_by_name ("accidentals." + font_char));
123 me->warning (_f ("accidental `%s' not found", font_char));
126 SCM what = scm_caar (s);
127 int pos = alteration_pos (what, alteration, c0p);
128 acc.translate_axis (pos * inter, Y_AXIS);
131 The natural sign (unlike flat & sharp)
132 has vertical edges on both sides. A little padding is
133 needed to prevent collisions.
137 && last_pos < pos + 2
138 && last_pos > pos - 6)
141 mol.add_at_edge (X_AXIS, LEFT, acc, padding, 0);
146 mol.align_to (X_AXIS, LEFT);
148 return mol.smobbed_copy ();
151 ADD_INTERFACE (Key_signature_interface, "key-signature-interface",
152 "A group of accidentals, to be printed as signature sign.",
153 "style c0-position alteration-alist");