% Feta (not the Font-En-Tja) music font --  bracket tips -*-Fundamental-*-
% This file is part of LilyPond, the GNU music typesetter.
%
% Copyright (C) 2005--2015 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 ("brackettips");

def draw_bracket (expr thick_sharp, width_sharp, updown) =
begingroup;
	save p, thin, thick, flattening, width, hair, flare;
	path p;
	pair tipdir;

	flattening = 0.72;
	thick# = thick_sharp;
	flare# = flattening * width#;
	width# = width_sharp;

	define_pixels (thick, width, flare);
	if updown = 1:
	        set_char_box (0, width#,
			      .5 thick#, flare#);
	else:
	        set_char_box (0, width#,
			      flare#, .5 thick#);
	fi;

	thin = 2 linethickness;
	hair = 1.25 linethickness;

	pickup pencircle scaled thin;
	y7 = y1;
	x7 = x2;
	z2 = z4r + (thin, 0);

	penpos3 (thin, 0);
	penpos4 (thin, 90);

	z3 = z4;

	top y3 = 0.5 thick;
	lft x3 = 0.0;
	x1 = x3l;
	y1 = -0.5 thick;

	z8 = .5 [z2, z7];
	top y5 = flare;
	rt x5 = width;

	p := z8{right}
	     ..tension 1.2.. z5{curl 0};
	tipdir := direction 1 of p;

	penpos5 (hair, angle tipdir);
	penpos6 (hair, 90 + angle tipdir);

	z5 = z6;

	pickup pencircle scaled 1;

	fill (z1
	      -- z3l{up}
	      .. z4r{right}
	      -- z2{right}
	      .. z6r{tipdir}
	      .. z5r
	      .. z6l{-tipdir}
	      ..tension 1.1.. z7{left}
	      & z7
	      -- z1
	      & cycle) yscaled updown;

	if updown = 1:
		penlabels (1, 2, 3, 4, 5, 6, 7, 8);
	fi;
endgroup;
enddef;


fet_beginchar ("bracket tip up", "up");
	draw_bracket (0.45 staff_space#, 1.9 staff_space#, 1);
fet_endchar;


fet_beginchar ("bracket tip down", "down");
	draw_bracket (0.45 staff_space#, 1.9 staff_space#, -1);
fet_endchar;

fet_endgroup ("brackettips");