% -*- Fundamental -*-  (emacs-20 mf mode mucks
% feta-pendaal.mf -- piano pedal markings
%
% part of LilyPond's pretty-but-neat music font
%
% source file of the Feta (not the Font-En-Tja) music font
%
% (c) 2000--2009 Jan Nieuwenhuizen <janneke@gnu.org>
%
% Voor Cup

% Kerning
%
% Pe = -0.034 pedalh == -0.07 staff-space
% ed = -0.27 pedalh == -0.53 staff-space


fet_begingroup ("pedal");

pedalpha = 40;
pedbeta = 25;

penh# = 0.7 linethickness#;
penw# = 2 penh# + 0.14 staff_space#;
define_pixels (penh, penw);

pedalh# = 2 staff_space#;
pedalbh# = 4/7 pedalh#;
define_pixels (pedalh, pedalbh);


fet_beginchar ("Pedal asterisk", "*");
	save bulb, p, radius, thin, inner_r;
	path pat;

	set_char_box (0, 7/9 pedalh#, 0, 7/9 pedalh#);

	z0 = (1/2 w, h - 1/2 w);

	thin = 0.8 linethickness;

	bulb + 2 radius = w;
	0.9 thin + bulb = (radius * pi * 2) / 8;

	pickup pencircle scaled penh;

	penpos1 (bulb, 180);
	penpos2 (bulb, 0);
	penpos3 (thin, 0);

	z1 = z0 + (0, radius);
	z2 = z1;

	inner_r = .45 radius;

	z4l = z0 + inner_r * dir (90 + 360/16);
	z4r = z0 + inner_r * dir (90 - 360/16);

	z4 = .5 [z4l, z4r];
	z3 = .75 [z1, z4];

	penlabels (0, 1, 2, 3, 4);

	pat := z3r{up}
	       .. z1l{up}
	       .. z2l{down}
	       .. z3l{down}
	       .. z4l{dir (180 + 360/16)};
	for i = 1 upto 7:
		pat := pat
		       .. ((z3r{up}
			   .. z1l{up}
			   .. z2l{down}
			   .. z3l{down}
			   .. z4l{dir (180 + 360/16)})
				rotatedaround (z0, 360/8 i));
	endfor;

	pat := pat
	       .. cycle;
	fill pat;

	pickup pencircle scaled (7/8 inner_r);

	undrawdot z0;
fet_endchar;


%% ugh. rounded corners!

fet_beginchar ("Pedal dash", "M");
	save dash_thickness;

	dash_thickness# := penw#;
	define_whole_vertical_blacker_pixels (dash_thickness);

	set_char_box (0, 3 penw#, 0, pedalbh#);

	penpos1 (dash_thickness, 60);
	penpos2 (dash_thickness, 60);

	z1l = (0, vround (2/3 h - 1/2 penw));
	z2r = (w, vround (y1l + 1.2 penw));

	penlabels (1, 2, 3);

	penstroke z1e{dir 40}
		  ..tension 1.2.. z2e{dir 40};
fet_endchar;


fet_beginchar ("Pedal dot", ".");
	set_char_box (0, penw#, 0, penw#);

	pickup pencircle scaled penw;

	drawdot (hround (1/2 penw), vround (1/2 penw));
fet_endchar;


def draw_pedal_P (expr show_labels) =
begingroup;
	clearxy;

	penpos1 (hround penh, 0);
	penpos2 (penw, 55);
	penpos3 (penw, pedalpha);
	penpos4 (1.2 penh, -pedalpha);
	penpos5 (penh, -pedalpha);
	penpos6 (penh, 180 - pedalpha);
	penpos7 (penh, 180 - pedalpha);
	penpos8 (penh, 90);
	penpos9 (4/3 penw, 50);
	penpos10 (1.4 penw, 50);
	penpos11 (penh, 90 + pedalpha);

	z1r = (hround 0.6 w, h);
	x2l = hround (x1l - penw) + xpart feta_offset;
	y2 = vround (0.7 h) + ypart feta_offset;
	x3r = hround (x2l + 2 penw);
	y3r = 0.4 h;
	z4l = z5r + 1/4 (z3r - z5r);
	x5 = 1/4 w;
	y5r = 0;
	z6 = z5;
	z7l = z6r + 1/3 (z8r - z6r);
	z8r = z5r + 3/5 (z3r - z5r);
	x9l = x10l - penh;
	y9l = 1/4 penh;
	x10l = w - tand (90 - pedalpha) * y11l;
	y10l = 1/4 penh;
	x11l = w;
	y11 = 1/5 h;

	% don't stick out at the top
	z1' = round (0.9 [z2, z1]) + (xpart feta_offset, 0);
	penpos1' (penh, 0);

	% shift start point of pen stroke to avoid overlapping contours
	z8'l = z8l;
	y8'r = y8r;
	z8'r = z8l + whatever * (z3r - z8l);

	penpos12 (hround penh, 0);
	penpos13 (penw, -90 - pedbeta);
	penpos14 (vround penh, 90);
	penpos15 (penw, -90 + pedbeta);
	penpos16 (penh, 180 + pedbeta);

	z12r = (hround (5/9 x1 + 1/2 hround penh), y2);
	z13l = (1/2 x12r, y15r);
	z14r = z1r;
	z15l = (1/2 [x16, w], y2l + 0.5 penw);
	x16 = 1/4 [x1, w];
	y16r = y2r;

	% We now do a correction to `center' the stem horizontally.  While
	% this is not the most elegant solution, it is definitely the
	% easiest...

	save horz_corr;
	horz_corr = 1/5 [x12, x16] - x2l;
	x2 := x2 + horz_corr;
	x2l := x2l + horz_corr;
	x2r := x2r + horz_corr; 

	penstroke z1'e
		  ..tension 2.5.. z2e
		  ..tension 1.5.. z3e
		  ..tension 2.5.. {dir (225)}z4e;

	soft_end_penstroke z8'e{right}
			   ..tension 1.5.. z9e{dir (-pedalpha)}
			   .. z10e
			   ..tension 2.5.. z11e;

	fill z4r{dir (225)}
	     ..tension 1.5.. z5r{left}
	     .. z6r
	     ..tension 1.5.. z7r
	     ..tension 1.5.. z8r{right}
	     -- cycle;

	soft_penstroke z12e{down}
		       ..tension 1.1.. z13e{dir (180 - pedbeta)}
		       ..tension 1.1.. z14e{right}
		       ..tension 1.1.. z15e{dir (180 + pedbeta)}
		       ..tension 1.1.. z16e{dir (90 + pedbeta)};

	if show_labels = 1:
		penlabels (range 1 thru 16);
		penlabels (1', 8');
	fi;
endgroup;
enddef;


def draw_pedal_d (expr show_labels) =
begingroup;
	clearxy;

	penpos1 (vround penh, -10 - 90);
	penpos2 (hround penw, 190);
	penpos3 (vround (2 penh), 90);
	penpos4 (hround (3/4 penw), 0);
	penpos5 (penh, -70);

	x1r = 0;
	y1l = h;
	z2 = (w - 1/2 hround penw, 1/2 pedalbh + penh);
	z4l = (hround (1/3 w), 1/2 pedalbh);
	z5l = (2/3 w, pedalbh);
	z3l = (hround x5l, 0);

	if show_labels = 1:
		penlabels (1, 2, 3, 4, 5);
	fi;

	soft_start_penstroke z1e{dir (-10)}
			     ..tension 1.1.. z2e{dir (-90 + 10)}
			     ..tension 1.1.. z3e{left}
			     ..tension 1.1.. z4e{up}
			     ..tension 1.1.. z5e{dir (-70 + 90)};
endgroup;
enddef;


def draw_pedal_e (expr show_labels) =
begingroup;
	clearxy;

	penpos1 (penh, pedalpha - 90);
	penpos2 (penh, pedalpha - 90);
	penpos3 (3/5 penw, pedalpha);
	penpos4 (1.2 penh, 90 + pedalpha);
	penpos5 (2/3 penw, 180);
	penpos6 (penw, 180 + pedalpha);
	penpos7 (2/3 penw, -90 - 20);
	penpos8 (penh, pedalpha - 90);

	z1l = (0, 1/5 pedalh);
	% this helps to make the path go through z2 at low resolutions
	z2 = round (z1 + dir pedalpha * penw) + feta_offset;
	z3 = (3/5 w, 8/9 h);
	z4 = (2/9 w,  y3);
	x4r := hround x4r;
	x5r = 0;
	y5 = y2;
	x6 = 3/8 w;
	y6r = 1/2 penh;
	z7l = (x6l + penh, y6l);
	x8r = w;
	y8 = 1/5 pedalh;

	soft_penstroke z1e
		       -- z2e{z2 - z1}
		       ..tension 1.1.. z3e
		       ..tension 1.05.. z4e
		       ..tension 1.1.. z5e
		       ..tension 1.5.. z6e{dir - pedalpha}
		       ..tension 1.1.. z7e
		       ..tension 2.5.. z8e;

	if show_labels = 1:
		penlabels (range 1 thru 8);
	fi;
endgroup;
enddef;


fet_beginchar ("Pedal P", "P");
	set_char_box (0, 5/6 pedalh#, 0, pedalh#);

	draw_pedal_P (1);
fet_endchar;


fet_beginchar ("Pedal d", "d");
	set_char_box (0, 2/3 pedalh#, 0, 7/8 pedalh#);

	draw_pedal_d (1);
fet_endchar;


fet_beginchar ("Pedal e", "e");
	set_char_box (0, 2/5 pedalh#, 0, pedalbh#);

	draw_pedal_e (1);
fet_endchar;


fet_beginchar ("Pedal Ped", "Ped");
	P_width# = 5/6 pedalh#;
	e_width# = 2/5 pedalh#;
	d_width# = 2/3 pedalh#;
	define_pixels (P_width, e_width, d_width);

	e_height = pedalbh;
	d_height = 7/8 pedalh;

	% Pe = -0.034 pedalh == -0.07 staff-space
	% ed = -0.27 pedalh == -0.53 staff-space
	Pe_kern# = -0.034 pedalh#;
	ed_kern# = -0.27 pedalh#;
	define_pixels (Pe_kern, ed_kern);

	w := hround d_width;
	h := vround d_height;
	draw_pedal_d (0);
	currentpicture := currentpicture
			    shifted (hround (e_width + ed_kern), 0);

	w := hround e_width;
	h := vround e_height;
	draw_pedal_e (0);
	currentpicture := currentpicture
			    shifted (hround (P_width + Pe_kern), 0);

	w := hround P_width;
	h := vround pedalh;
	draw_pedal_P (0);

	set_char_box (0, P_width# + Pe_kern# + e_width# + ed_kern# + d_width#,
		      0, pedalh#);
fet_endchar;


fet_endgroup ("pedal");
