mf/feta-klef.mf

   1 % feta-klef.mf --  implement Clefs
   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# = reduced_il#;
  19         right_space# = reduced_il#;
  20 enddef;
  21
  22 def draw_staff(expr first, last)=
  23         pickup pencircle scaled stafflinethickness;
  24         for i:= first step 1 until last:
  25                 draw (- interline, i* interline) .. (4 interline, i* interline);
  26         endfor
  27         enddef;
  28
  29 % [Wanske] says the bulbs should be positioned about 1/4 right of the
  30 % "arrow"
  31 def draw_c_clef (expr reduction) =
  32         save hair, norm, reduced_il, right_edge;
  33         reduced_il#=interline#*reduction;
  34         norm#:=2/3reduced_il#;
  35         hair#:=1/6norm#;
  36
  37         set_horizontal_spacing;
  38         right_edge# = 15/4norm#+2hair#;
  39
  40         set_char_box (left_space#, right_edge# + right_space#,
  41                 2 reduced_il#, 2 reduced_il#);
  42         define_pixels (hair,norm,reduced_il, right_edge);
  43
  44         draw_block ((0,-d), (3/4norm+1/2hair,h));
  45         draw_block ((3/4norm+2hair,-d),
  46                 (3/4norm+7/2hair,h));
  47
  48         save xoff;
  49         xoff=3/4norm+7/2hair;
  50         penpos1(hair,-90);
  51         z1l=(xoff+norm+hair,h);
  52         penpos2(norm-3/2hair,180);
  53         z2l=(right_edge,h/2);
  54         penpos3(hair,90);
  55         z3=(((right_edge -xoff)/2)+xoff,2hair);
  56
  57         penpos4(hair,0);
  58         z4=(xoff+1/2norm+1/2hair,reduced_il-hair);
  59
  60         penpos5(4hair,0);
  61         z5=(xoff+5/4hair,0);
  62
  63         penpos6(norm-hair,90);
  64         z6=(xoff+3/4norm,0);
  65
  66         penpos7(hair,-90);
  67         z7r=(x1,-d);
  68
  69         save t; t=0.833;
  70         save p; path p;
  71         p = z5l..z4l{up}..z4r{down}..z3r{right}..tension t..z2r{up}
  72                 ..tension t..z1r{left}..z1l{right}..tension t..z2l{down}
  73                 ..z3l{left}..z6r..z5r{down};
  74         pickup pencircle scaled 1pt#;
  75         filldraw p..(reverse p yscaled -1)..cycle;
  76         penlabels (1,2,3,4,5,6);
  77
  78         % ugh, should be bulb, not flare?
  79         draw_flare(z1l,180,90,hair,norm-1/2hair);
  80         draw_flare(z7r,180,-90,hair,norm-1/2hair);
  81         enddef;
  82
  83 fet_beginchar ("C clef", "alto", "altoclef")
  84         if test = 1:
  85                 draw_staff (-2,2);
  86         fi;
  87         draw_c_clef (1.0);
  88 fet_endchar;
  89
  90 fet_beginchar ("C clef", "alto_change", "caltoclef")
  91         if test = 1:
  92                 draw_staff (-2,2);
  93         fi;
  94         draw_c_clef (.8);
  95 fet_endchar;
  96
  97 %
  98 % Inspired by Baerenreiter and Breitkopf
  99 %
 100 % FIXME: dims
 101 % FIXME: right vertical tangent seems to be lower than the F-line
 102 % FIXME: bulb curve smoothly into "long curve" on the  inside
 103 %
 104 %
 105 % [Wanske] says that the extreme x point should be exactly between
 106 % the dots, but her picture shows that the extreme is ~ 0.2 ss lower
 107
 108 def draw_bass_klef(expr exact_center, reduction) =
 109         save reduced_il, left_tilt, left_thick, ball_to_right;
 110         reduced_il# = interline# * reduction;
 111
 112         set_horizontal_spacing;
 113         ball_to_right# = 2.1 reduced_il#;
 114         set_char_box(left_space# +
 115                 - xpart exact_center,
 116                 right_space# +
 117                 xpart exact_center + ball_to_right#,
 118                 - ypart exact_center + 2.5 reduced_il#,
 119                 ypart exact_center +reduced_il#);
 120
 121         define_pixels(reduced_il, ball_to_right);
 122         left_tilt = 5;
 123         left_thick = .25  reduced_il;
 124
 125         x1r - x1l = left_thick;
 126         z1l = (hround_pixels(xpart exact_center),
 127                 vround_pixels(ypart exact_center));
 128
 129         y2 = reduced_il;
 130
 131         x3l - x1l =  ball_to_right;
 132         x2 = .5 [x1,x3];
 133         x3l - x3r = .48 reduced_il;
 134         y3l = -0.05 interline;
 135         x4 = x1l - stafflinethickness;
 136         y4 = -2.2  reduced_il;
 137         z5 = (x3l +  1/3 reduced_il, .5 reduced_il);
 138
 139         penpos1(whatever, left_tilt);
 140         penpos2(1.2 stafflinethickness, -90);
 141         penpos3(whatever,  185);
 142         penpos4(stafflinethickness, 135);
 143
 144         draw_bulb(1, z1r,  z1l, .45 reduced_il, 1.0);
 145
 146
 147         fill z1r{up} .. z2r{right} .. tension 1.0 .. z3r{down}  .. {curl 0}
 148                 simple_serif(z4r, z4l, 90) {curl 0}
 149                 .. z3l{up} .. tension 0.9 .. z2l{left}
 150                 .. z1l{dir (-90 + left_tilt)} -- cycle;
 151         labels(2,4);
 152         penlabels(1,2,3,4);
 153
 154         save dot_diam;
 155         2 dot_diam = reduction* (interline - stafflinethickness);
 156         pickup pencircle scaled dot_diam;
 157         draw z5;
 158         draw z5 yscaled -1;
 159 enddef;
 160
 161
 162
 163 fet_beginchar("F clef ", "bass", "bassclef")
 164         if test = 1:
 165                 draw_staff(-3,1);
 166         fi;
 167         draw_bass_klef((.5 interline#, 0), 1.0);
 168 fet_endchar;
 169 fet_beginchar("F clef (reduced)", "bass_change", "cbassclef")
 170         draw_bass_klef((.4 interline#, 0),0.8);
 171 fet_endchar;
 172
 173
 174
 175 %
 176 % Inspired by Baerenreiter
 177 %
 178 % FIXME bulb should curve (see bass clef)
 179 % FIXME start (inside) should be little thinner
 180 % FIXME parametrise.
 181 %
 182
 183 % Beste lezers, kijk,
 184 %
 185 % Een bolletje  hebben we bij toeval allemaal wel eens getekend, maar begint u
 186 % toch eenvoudig.   Eerst een eenvoudig kruis of herstellingsteken
 187 % en via de dubbelslag naar een voorzichtig vlaggetje, en heb geduld!
 188 % Ikzelf heb bijvoorbeeld over mijn eerste gave G-sleutel
 189 % 35 kilobyte metafont, 12 patchlevels, 0 vriendinnen en 45 dagen gedaan
 190 %
 191 def draw_gclef (expr exact_center, reduction)=
 192         save reduced_il, downstroke_dir, downstroke_angle, hair, center;
 193         save breapth_factor, inner_thick_end, thinness, thickness, thinnib;
 194         save inner_start_angle, thinness, thinpen;
 195         reduced_il# = interline# * reduction;
 196         define_pixels(reduced_il);
 197         pair downstroke_dir, center;
 198
 199         center := (hround_pixels(xpart exact_center),
 200                 vround_pixels(ypart exact_center));
 201
 202         hair =  .3 stafflinethickness;
 203         thinness = 1.3 stafflinethickness;
 204         downstroke_dir = (14, -75);
 205         breapth_factor = 11/7;
 206         inner_thick_end = 45;
 207         inner_start_angle = downstroke_angle - 43;
 208         thickness = .4 reduced_il - hair;
 209
 210         thinnib = thinness - hair;
 211         thinpen = thinness;
 212         set_horizontal_spacing;
 213
 214         set_char_box(
 215                 left_space# +
 216                 -xpart exact_center + 1.0 * breapth_factor* reduced_il#,
 217                 right_space# +
 218                 xpart exact_center + .66 breapth_factor* reduced_il#,
 219                 -ypart exact_center + 3 * reduced_il#,
 220                 ypart exact_center + 5 * reduced_il#);
 221
 222         pickup pencircle scaled hair;
 223         downstroke_angle = angle downstroke_dir;
 224
 225         z1 = center + whatever * dir (inner_start_angle);
 226         x1 = xpart center -.28 reduced_il;
 227
 228         top z2r = center + (0,reduced_il + stafflinethickness/2);
 229
 230         x4 = xpart center - .1 reduced_il;
 231         bot y4r = -(reduced_il + .5 stafflinethickness);
 232
 233         z3 = (z4 - center) rotated inner_thick_end + center;
 234
 235         z5r = (- breapth_factor, .37)* reduced_il + center;
 236         penpos5(thickness, 135);
 237
 238         z6 = center + whatever * downstroke_dir;
 239         y6 = ypart center + 2 reduced_il;
 240
 241         z7l - z6 = whatever *(z5- z6) ;
 242         y7l = 3.5 reduced_il;
 243         z8r = .4 [z9r, z7r] + 1.5 stafflinethickness * dir 52;
 244
 245         x9 = .7 [x10, x7r];
 246         top y9l = 5 reduced_il;
 247
 248         y10 = 3. reduced_il;
 249         y11 = -11/7 reduced_il;
 250
 251         y12 = ypart center - 18.5/7 reduced_il;
 252         x12 = x11 - 5 /7 reduced_il;
 253
 254         z13 = z12 + .6 reduced_il*(-1,1);
 255
 256         (z10r - z10l) dotprod (unitvector downstroke_dir rotated 90) =
 257                 thinnib;
 258
 259         center - z10= whatever * downstroke_dir;
 260         center - z11 =  whatever * downstroke_dir;
 261         center - z14 = .8 (center - z11);
 262         penpos1(thinnib, inner_start_angle);
 263         penpos2(thickness, 90);
 264         penpos3(thinnib, -90 + inner_thick_end);
 265         penpos4(thinnib, -90);
 266
 267
 268         penpos7(thickness, 135);
 269         penpos8(1.5 thinnib, - 70 + angle downstroke_dir);
 270         penpos9(1.4 thickness, -80);  % ugh
 271         penpos10(whatever, downstroke_angle + 10);
 272         penpos11(thinnib, downstroke_angle + 90);
 273         penpos14(thinnib, downstroke_angle + 90);
 274         penpos12(thinnib, -90);
 275         penpos13(3 thinnib, 180);
 276
 277         filldraw z2l{right}   .. z3l.. z4l{left} .. z5l{up}  .. z7l{up}
 278                 %.. z8l
 279                 .. tension 1.2
 280                 .. z9l & z9l ..
 281                 {downstroke_dir}z10l --- z11l -- z11r --- z10r{- downstroke_dir}
 282                 .. tension .8
 283                 .. z9r & z9r{dir (downstroke_angle+ 40)} % ugh
 284                 %.. z8r
 285                 .. z7r{down} .. z5r{down} .. z4r{right}
 286                 .. z3r .. z2r{left} ..
 287                 tension .95 ..
 288                 z1r -- z1l
 289                 .. tension 0.85 ..cycle;
 290
 291         filldraw simple_serif(z1r, z1l, 90)  -- cycle;
 292
 293         filldraw z12r{left} .. z13r{up} -- z13l{down} .. z12l{right} .. cycle;
 294
 295         draw_bulb(-1,  z13l, lft z13r, 6/14 reduced_il, 1.0);
 296
 297         pickup pencircle scaled (thinpen);
 298         draw z10 --- z14 .. z11  .. tension 0.85 ..  z12{left};
 299
 300         penlabels(range 1 thru 15);
 301 enddef;
 302
 303
 304 fet_beginchar("G clef", "violin", "violinclef")
 305         if test = 1:
 306                 draw_staff(-1,3);
 307         fi;
 308         draw_gclef((1.7 interline#,0), 1.0);
 309 fet_endchar;
 310 fet_beginchar("G clef", "violin_change", "cviolinclef")
 311         draw_gclef((1.3 interline#,0), .8);
 312 fet_endchar;
 313
 314 fet_endgroup("clefs");