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% Feta (not the Font-En-Tja) music font -- draw arrow heads
% This file is part of LilyPond, the GNU music typesetter.
%
% Copyright (C) 2005--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
%
% The LilyPond font is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version, or under the SIL Open Font License.
%
% LilyPond is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
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");
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