mf/feta-klef.mf

   1 % feta-klef.mf --  implement Clefs -*-Fundamental-*-
   2 %
   3 % part of LilyPond's pretty-but-neat music font
   4 %
   5 % source file of the Feta (not the Font-En-Tja) music font
   6 %
   7 % (c) 1997, 1998 Han-Wen Nienhuys <hanwen@stack.nl>,
   8 % Jan Nieuwenhuizen <janneke@gnu.org>
   9
  10
  11 fet_begingroup("clefs");
  12
  13 %
  14 % [Ross] says that clefs take 1 interline space on the left and right
  15 %
  16 def set_horizontal_spacing =
  17         save left_space ,right_space;
  18         left_space# = 0;
  19         right_space# = 0;
  20 enddef;
  21
  22
  23 % [Wanske] says the bulbs should be positioned about 1/4 right of the
  24 % "arrow"
  25 def draw_c_clef (expr reduction) =
  26         save hair, norm, reduced_il, right_edge;
  27         reduced_il#=interline#*reduction;
  28         norm#:=2/3reduced_il#;
  29         hair#:=1/6norm#;
  30
  31         set_horizontal_spacing;
  32         right_edge# = 15/4norm#+2hair#;
  33
  34         set_char_box (left_space#, right_edge# + right_space#,
  35                 2 reduced_il#, 2 reduced_il#);
  36         define_pixels (hair,norm,reduced_il, right_edge);
  37
  38         draw_block ((0,-d), (3/4norm+1/2hair,h));
  39         draw_block ((3/4norm+2hair,-d),
  40                 (3/4norm+7/2hair,h));
  41
  42         save xoff;
  43         xoff=3/4norm+7/2hair;
  44         penpos1(hair,-90);
  45         z1l=(xoff+norm+hair,h);
  46         penpos2(norm-3/2hair,180);
  47         z2l=(right_edge,h/2);
  48         penpos3(hair,90);
  49         z3=(((right_edge -xoff)/2)+xoff,2hair);
  50
  51         penpos4(hair,0);
  52         z4=(xoff+1/2norm+1/2hair,reduced_il-hair);
  53
  54         penpos5(4hair,0);
  55         z5=(xoff+5/4hair,0);
  56
  57         penpos6(norm-hair,90);
  58         z6=(xoff+3/4norm,0);
  59
  60         penpos7(hair,-90);
  61         z7r=(x1,-d);
  62
  63         save t; t=0.833;
  64         save p; path p;
  65         p = z5l..z4l{up}..z4r{down}..z3r{right}..tension t..z2r{up}
  66                 ..tension t..z1r{left}..z1l{right}..tension t..z2l{down}
  67                 ..z3l{left}..z6r..z5r{down};
  68         pickup pencircle scaled 1pt#;
  69         filldraw p..(reverse p yscaled -1)..cycle;
  70         penlabels (1,2,3,4,5,6);
  71
  72         % ugh, should be bulb, not flare?
  73         draw_flare(z1l,180,90,hair,norm-1/2hair);
  74         draw_flare(z7r,180,-90,hair,norm-1/2hair);
  75         enddef;
  76
  77 fet_beginchar ("C clef", "C", "altoclef")
  78         if test = 1:
  79                 draw_staff (-2,2);
  80         fi;
  81         draw_c_clef (1.0);
  82 fet_endchar;
  83
  84 fet_beginchar ("C clef", "C_change", "caltoclef")
  85         if test = 1:
  86                 draw_staff (-2,2);
  87         fi;
  88         draw_c_clef (.8);
  89 fet_endchar;
  90
  91 %
  92 % Inspired by Baerenreiter and Breitkopf
  93 %
  94 % FIXME: dims
  95 % FIXME: right vertical tangent seems to be lower than the F-line
  96 % FIXME: bulb curve smoothly into "long curve" on the  inside
  97 %
  98 %
  99 % [Wanske] says that the extreme x point should be exactly between
 100 % the dots, but her picture shows that the extreme is ~ 0.2 ss lower
 101
 102 def draw_bass_clef(expr exact_center, reduction) =
 103         save reduced_il, left_tilt, left_thick, ball_to_right;
 104         reduced_il# = interline# * reduction;
 105
 106         set_horizontal_spacing;
 107         ball_to_right# = 2.1 reduced_il#;
 108         set_char_box(left_space# +
 109                 - xpart exact_center,
 110                 right_space# +
 111                 xpart exact_center + ball_to_right#,
 112                 - ypart exact_center + 2.5 reduced_il#,
 113                 ypart exact_center +reduced_il#);
 114
 115         define_pixels(reduced_il, ball_to_right);
 116         left_tilt = 5;
 117         left_thick = .25  reduced_il;
 118
 119         x1r - x1l = left_thick;
 120         z1l = (hround_pixels(xpart exact_center),
 121                 vround_pixels(ypart exact_center));
 122
 123         y2 = reduced_il;
 124
 125         x3l - x1l =  ball_to_right;
 126         x2 = .5 [x1,x3];
 127         x3l - x3r = .48 reduced_il;
 128         y3l = -0.05 interline;
 129         x4 = x1l - stafflinethickness;
 130         y4 = -2.2  reduced_il;
 131         z5 = (x3l +  1/3 reduced_il, .5 reduced_il);
 132
 133         penpos1(whatever, left_tilt);
 134         penpos2(1.2 stafflinethickness, -90);
 135         penpos3(whatever,  185);
 136         penpos4(stafflinethickness, 135);
 137
 138         draw_bulb(1, z1r,  z1l, .45 reduced_il, 1.0);
 139
 140
 141         fill z1r{up} .. z2r{right} .. tension 1.0 .. z3r{down}  .. {curl 0}
 142                 simple_serif(z4r, z4l, 90) {curl 0}
 143                 .. z3l{up} .. tension 0.9 .. z2l{left}
 144                 .. z1l{dir (-90 + left_tilt)} -- cycle;
 145         labels(2,4);
 146         penlabels(1,2,3,4);
 147
 148         save dot_diam;
 149         2 dot_diam = reduction* (interline - stafflinethickness);
 150         pickup pencircle scaled dot_diam;
 151         draw z5;
 152         draw z5 yscaled -1;
 153 enddef;
 154
 155
 156
 157 fet_beginchar("F clef ", "F", "bassclef")
 158         if test = 1:
 159                 draw_staff(-3,1);
 160         fi;
 161         draw_bass_clef((.5 interline#, 0), 1.0);
 162 fet_endchar;
 163 fet_beginchar("F clef (reduced)", "F_change", "cbassclef")
 164         draw_bass_clef((.4 interline#, 0),0.8);
 165 fet_endchar;
 166
 167
 168
 169 %
 170 % Inspired by Baerenreiter
 171 %
 172 % FIXME bulb should curve (see bass clef)
 173 % FIXME start (inside) should be little thinner
 174 % FIXME parametrise.
 175 %
 176
 177 % Beste lezers, kijk,
 178 %
 179 % Een bolletje  hebben we bij toeval allemaal wel eens getekend, maar begint u
 180 % toch eenvoudig.   Eerst een eenvoudig kruis of herstellingsteken
 181 % en via de dubbelslag naar een voorzichtig vlaggetje, en heb geduld!
 182 % Ikzelf heb bijvoorbeeld over mijn eerste gave G-sleutel
 183 % 35 kilobyte metafont, 12 patchlevels, 0 vriendinnen en 45 dagen gedaan
 184 %
 185 %  -- vrij naar Van Kooten & De Bie
 186 %
 187
 188 def draw_gclef (expr exact_center, reduction)=
 189         save reduced_il, downstroke_dir, downstroke_angle, hair, center;
 190         save breapth_factor, inner_thick_end, thinness, thickness, thinnib;
 191         save inner_start_angle, thinness, thinpen;
 192         reduced_il# = interline# * reduction;
 193         define_pixels(reduced_il);
 194         pair downstroke_dir, center;
 195
 196         center := (hround_pixels(xpart exact_center),
 197                 vround_pixels(ypart exact_center));
 198
 199         hair =  .3 stafflinethickness;
 200         thinness = 1.3 stafflinethickness;
 201         downstroke_dir = (14, -75);
 202         breapth_factor = 11/7;
 203         inner_thick_end = 45;
 204         inner_start_angle = downstroke_angle - 43;
 205         thickness = .4 reduced_il - hair;
 206
 207         thinnib = thinness - hair;
 208         thinpen = thinness;
 209         set_horizontal_spacing;
 210
 211         set_char_box(
 212                 left_space# +
 213                 -xpart exact_center + 1.0 * breapth_factor* reduced_il#,
 214                 right_space# +
 215                 xpart exact_center + .66 breapth_factor* reduced_il#,
 216                 -ypart exact_center + 3 * reduced_il#,
 217                 ypart exact_center + 5 * reduced_il#);
 218
 219         pickup pencircle scaled hair;
 220         downstroke_angle = angle downstroke_dir;
 221
 222         z1 = center + whatever * dir (inner_start_angle);
 223         x1 = xpart center -.28 reduced_il;
 224
 225         top z2r = center + (0,reduced_il + stafflinethickness/2);
 226
 227         x4 = xpart center - .1 reduced_il;
 228         bot y4r = -(reduced_il + .5 stafflinethickness);
 229
 230         z3 = (z4 - center) rotated inner_thick_end + center;
 231
 232         z5r = (- breapth_factor, .37)* reduced_il + center;
 233         penpos5(thickness, 135);
 234
 235         z6 = center + whatever * downstroke_dir;
 236         y6 = ypart center + 2 reduced_il;
 237
 238         z7l - z6 = whatever *(z5- z6) ;
 239         y7l = 3.5 reduced_il;
 240         z8r = .4 [z9r, z7r] + 1.5 stafflinethickness * dir 52;
 241
 242         x9 = .7 [x10, x7r];
 243         top y9l = 5 reduced_il;
 244
 245         y10 = 3. reduced_il;
 246         y11 = -11/7 reduced_il;
 247
 248         y12 = ypart center - 18.5/7 reduced_il;
 249         x12 = x11 - 5 /7 reduced_il;
 250
 251         z13 = z12 + .6 reduced_il*(-1,1);
 252
 253         (z10r - z10l) dotprod (unitvector downstroke_dir rotated 90) =
 254                 thinnib;
 255
 256         center - z10= whatever * downstroke_dir;
 257         center - z11 =  whatever * downstroke_dir;
 258         center - z14 = .8 (center - z11);
 259         penpos1(thinnib, inner_start_angle);
 260         penpos2(thickness, 90);
 261         penpos3(thinnib, -90 + inner_thick_end);
 262         penpos4(thinnib, -90);
 263
 264
 265         penpos7(thickness, 135);
 266         penpos8(1.5 thinnib, - 70 + angle downstroke_dir);
 267         penpos9(1.4 thickness, -80);  % ugh
 268         penpos10(whatever, downstroke_angle + 10);
 269         penpos11(thinnib, downstroke_angle + 90);
 270         penpos14(thinnib, downstroke_angle + 90);
 271         penpos12(thinnib, -90);
 272         penpos13(3 thinnib, 180);
 273
 274         filldraw z2l{right}   .. z3l.. z4l{left} .. z5l{up}  .. z7l{up}
 275                 %.. z8l
 276                 .. tension 1.2
 277                 .. z9l & z9l ..
 278                 {downstroke_dir}z10l --- z11l -- z11r --- z10r{- downstroke_dir}
 279                 .. tension .8
 280                 .. z9r & z9r{dir (downstroke_angle+ 40)} % ugh
 281                 %.. z8r
 282                 .. z7r{down} .. z5r{down} .. z4r{right}
 283                 .. z3r .. z2r{left} ..
 284                 tension .95 ..
 285                 z1r -- z1l
 286                 .. tension 0.85 ..cycle;
 287
 288         filldraw simple_serif(z1r, z1l, 90)  -- cycle;
 289
 290         filldraw z12r{left} .. z13r{up} -- z13l{down} .. z12l{right} .. cycle;
 291
 292         draw_bulb(-1,  z13l, lft z13r, 6/14 reduced_il, 1.0);
 293
 294         pickup pencircle scaled (thinpen);
 295         draw z10 --- z14 .. z11  .. tension 0.85 ..  z12{left};
 296
 297         penlabels(range 1 thru 15);
 298 enddef;
 299
 300
 301 fet_beginchar("G clef", "G", "trebleclef")
 302         if test = 1:
 303                 draw_staff(-1,3);
 304         fi;
 305         draw_gclef((1.7 interline#,0), 1.0);
 306 fet_endchar;
 307 fet_beginchar("G clef", "G_change", "ctrebleclef")
 308         draw_gclef((1.3 interline#,0), .8);
 309 fet_endchar;
 310
 311 fet_endgroup("clefs");