2 key-item.cc -- implement Key_item
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 keyplacement by Mats Bengtsson
11 #include "group-interface.hh"
12 #include "key-item.hh"
13 #include "molecule.hh"
14 #include "paper-def.hh"
16 #include "staff-symbol-referencer.hh"
18 const int FLAT_TOP_PITCH=2; /* fes,ges,as and bes typeset in lower octave */
19 const int SHARP_TOP_PITCH=4; /* ais and bis typeset in lower octave */
23 set_elt_property ("breakable", SCM_BOOL_T);
24 set_elt_property ("c0-position", gh_int2scm (0));
26 set_elt_property ("old-accidentals", SCM_EOL);
27 set_elt_property ("new-accidentals", SCM_EOL);
31 Key_item::add (int p, int a)
33 SCM pair = gh_cons (gh_int2scm (p),gh_int2scm (a));
34 Group_interface (this, "new-accidentals").add_thing (pair);
38 Key_item::add_old (int p, int a)
40 SCM pair = gh_cons (gh_int2scm (p),gh_int2scm (a));
41 Group_interface (this, "old-accidentals").add_thing (pair);
46 Key_item::calculate_position(SCM pair) const
48 int p = gh_scm2int (gh_car (pair));
49 int a = gh_scm2int (gh_cdr (pair));
51 if (to_boolean (get_elt_property ("multi-octave")))
53 return p + gh_scm2int (get_elt_property ("c0-position"));
56 // Find the c in the range -4 through 2
57 int from_bottom_pos = gh_scm2int (get_elt_property ("c0-position")) + 4;
58 from_bottom_pos = from_bottom_pos%7;
59 from_bottom_pos = (from_bottom_pos + 7)%7; // Precaution to get positive.
60 int c0 = from_bottom_pos - 4;
63 if ((a<0 && ((p>FLAT_TOP_PITCH) || (p+c0>4)) && (p+c0>1))
65 (a>0 && ((p>SHARP_TOP_PITCH) || (p+c0>5)) && (p+c0>2)))
67 p -= 7; /* Typeset below c_position */
69 /* Provide for the four cases in which there's a glitch
70 it's a hack, but probably not worth
71 the effort of finding a nicer solution.
73 if (c0==2 && a>0 && p==3)
75 if (c0==-3 && a>0 && p==-1)
77 if (c0==-4 && a<0 && p==-1)
79 if (c0==-2 && a<0 && p==-3)
88 - space the `natural' signs wider
95 Key_item::do_brew_molecule() const
99 Staff_symbol_referencer_interface si (this);
100 Real inter = si.staff_space ()/2.0;
102 SCM newas = get_elt_property ("new-accidentals");
105 SCM lists are stacks, so we work from right to left, ending with
106 the cancellation signature.
108 for (SCM s = newas; gh_pair_p (s); s = gh_cdr (s))
110 int a = gh_scm2int (gh_cdar (s));
111 Molecule m = lookup_l ()->afm_find ("accidentals-" + to_str (a));
112 m.translate_axis (calculate_position(gh_car (s)) * inter, Y_AXIS);
113 mol.add_at_edge (X_AXIS, LEFT, m, 0);
116 if (break_status_dir () != RIGHT)
118 SCM old = get_elt_property ("old-accidentals");
120 Add half a space between cancellation and key sig.
122 As suggested by [Ross], p.148.
124 Interval x(0, inter);
127 mol.add_at_edge (X_AXIS, LEFT, lookup_l()->blank (Box(x,y)),0);
129 for (; gh_pair_p (old); old = gh_cdr (old))
134 find correspondences in pitches
136 for (SCM s = newas; gh_pair_p (s); s = gh_cdr (s))
137 if (gh_caar(s) == gh_caar (old))
140 if (found == SCM_EOL || gh_cdr (found) != gh_cdar (old))
142 Molecule m =lookup_l ()->afm_find ("accidentals-0");
144 m.translate_axis (calculate_position(gh_car(old)) * inter, Y_AXIS);
145 mol.add_at_edge (X_AXIS, LEFT, m,0);