1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
%
% feta-arrow.mf -- draw arrow heads
%
% source file of the GNU LilyPond music typesetter
%
% (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
fet_begingroup ("arrowheads");
%
% To consider: we could put arrow heads at their real Unicode locations.
%
%
% Set up paths for upper half of arrow head pointing right.
% CLOSE_PATH is for a closed arrow, OPEN_PATH is for the open arrow.
% OPEN_TENSION sets the tension for the part which forms the path in
% OPEN_PATH.
%
def set_arrow_paths (expr width, height, open_tension, arrowlinethickness) =
save pat, finalpath;
save tip_angle_o, tip_angle_c, tip_dir_c, tip_dir_o;
save indent;
path pat, open_path, close_path;
pair tip_dir_o, tip_dir_c;
pickup pencircle scaled arrowlinethickness;
indent = linethickness / 2;
lft x1 = -width;
x2 = 0;
top y1 = height;
y2 = 0;
z4 = z3;
y5 = 0;
x5 = x4 + indent;
pat := z1
..tension open_tension.. z2{right};
penpos2 (arrowlinethickness, 90);
tip_dir_o := direction 0.0 of pat;
tip_angle_o := angle (tip_dir_o);
penpos1 (arrowlinethickness, 90 + tip_angle_o);
z3 = z1;
penpos3 (arrowlinethickness, tip_angle_o);
open_path := z1r{tip_dir_o}
.. z2r{right}
.. z2l{left}
.. z1l{-tip_dir_o}
.. z3l
.. cycle;
pat := z4
.. z5{down};
tip_dir_c := direction 0.0 of pat;
tip_angle_c := angle (tip_dir_c);
penpos4 (arrowlinethickness, 90+ tip_angle_c);
penpos5 (arrowlinethickness, 0);
z6 = z5;
penpos6 (arrowlinethickness, 90);
close_path := z4l{tip_dir_c}
.. z5l{down}
.. z6l{right}
.. z2l{right}
.. z2r{left}
..tension open_tension.. z1r{-tip_dir_o}
.. z3l
.. cycle;
enddef;
fet_beginchar ("open", "open.01");
set_char_box (staff_space#, 1.6 linethickness# / 2,
0.5 staff_space#, 0.5 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space,
1.0, 1.6 linethickness);
fill open_path;
open_path := open_path yscaled -1;
fill open_path;
penlabels (1, 2, 3);
penlabels (4, 5, 6);
fet_endchar;
fet_beginchar ("open", "open.0M1");
set_char_box (1.6 linethickness# / 2, staff_space#,
0.5 staff_space#, 0.5 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space,
1.0, 1.6 linethickness);
fill open_path;
open_path := open_path yscaled -1;
fill open_path;
currentpicture := currentpicture xscaled -1;
fet_endchar;
fet_beginchar ("open", "open.11");
set_char_box (.5 staff_space#, .5 staff_space#,
1.0 staff_space#, 1.6 linethickness# / 2);
set_arrow_paths (staff_space, 0.5 staff_space,
1.0, 1.6 linethickness);
fill open_path;
open_path := open_path yscaled -1;
fill open_path;
currentpicture := currentpicture rotated 90;
fet_endchar;
fet_beginchar ("open", "open.1M1");
set_char_box (.5 staff_space#, .5 staff_space#,
1.6 linethickness# / 2, 1.0 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space,
1.0, 1.6 linethickness);
fill open_path;
open_path := open_path yscaled -1;
fill open_path;
currentpicture := currentpicture rotated 90;
currentpicture := currentpicture yscaled -1;
fet_endchar;
fet_beginchar ("close", "close.01");
set_char_box (staff_space#, 0, 0.5 staff_space#, 0.5 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space, 1.5, blot_diameter);
fill close_path;
close_path := close_path yscaled -1;
fill close_path;
fet_endchar;
fet_beginchar ("close", "close.0M1");
set_char_box (0, staff_space#, 0.5 staff_space#, 0.5 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space, 1.5, blot_diameter);
fill close_path;
close_path := close_path yscaled -1;
fill close_path;
currentpicture := currentpicture xscaled -1;
fet_endchar;
fet_beginchar ("close", "close.11");
set_char_box (.5 staff_space#, .5 staff_space#,
1.0 staff_space#, 0.0 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space, 1.5, blot_diameter);
fill close_path;
close_path := close_path yscaled -1;
fill close_path;
currentpicture := currentpicture rotated 90;
fet_endchar;
fet_beginchar ("close", "close.1M1");
set_char_box (.5 staff_space#, .5 staff_space#,
0.0 staff_space#, 1.0 staff_space#);
set_arrow_paths (staff_space, 0.5 staff_space, 1.5, blot_diameter);
fill close_path;
close_path := close_path yscaled -1;
fill close_path;
currentpicture := currentpicture rotated -90;
fet_endchar;
fet_endgroup ("arrowheads");
|
