summaryrefslogtreecommitdiff
path: root/fonts/greek/levy/grbase.mf
blob: 455c85461750fd0a4405f7f5f630105c2b6da4c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
%    Copyright (C) 1991 Silvio Levy
%     
%    This file 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 2 of the License, or
%    (at your option) any later version.
%
%    This file 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 this program.  If not, see <http://www.gnu.org/licenses/>.
%
%    As a special exception, if you create a document which uses this font,
%    and embed this font or unaltered portions of this font into the
%    document, this font does not by itself cause the resulting document to
%    be covered by the GNU General Public License. This exception does not
%    however invalidate any other reasons why the document might be covered
%    by the GNU General Public License. If you modify this font, you may
%    extend this exception to your version of the font, but you are not
%    obligated to do so. If you do not wish to do so, delete this exception
%    statement from your version.

numeric grbase; grbase:=1;      %don't read this file twice
     
%make reference to file in subdirectories less painful
def readfrom(expr filename) = scantokens ("input " & filename); enddef;
     
%we start by defining a few more font parameters:
boolean monowidth;              %are the widths of all strokes roughly the same?
boolean straight;               %are certain strokes straight?
     
let old_font_setup = font_setup;
def font_setup =
 define_whole_vertical_pixels(acc_ht,circ_ht,Circ_ht,iota_dp);  %accent heights
 old_font_setup;
enddef;
     
%Since many of our characters are composite (for instance, s+letter),
%we avoid recomputing many pictures by saving them.
%But if we're using various definitions for the same letter (as when
%running 6test.mf) we can't use this trick, so we set working_hard:=true.
     
boolean working_hard;                   %are we to recompute letters every time?
working_hard:=false;
     
def this_letter =
  italcorr ital; adjust_fit(fit_params);
  if known savedpicture: currentpicture:=savedpicture; else: gen_letter; fi
  if not working_hard : picture savedpicture; savedpicture=currentpicture; fi
enddef;
     
%The following routines are for use with double characters.
boolean is_double; is_double:=false;
let oldendchar=endchar;
     
def begindoublechar(expr c,w_sharp,h_sharp,d_sharp) =
  is_double:=true; beginchar(c,w_sharp,h_sharp,d_sharp);
enddef;
     
def doublecharkern(expr k_sharp) =
  if not monospace: k:=hround(k_sharp*hppp); r:=r+k; charwd:=charwd+k_sharp; fi
enddef;
     
def middoublechar(expr w_sharp,h_sharp,d_sharp) =
  scantokens extra_endchar;
  forsuffixes e=r,l,w,charwd: numeric first.e; first.e:=e; endfor
     
  w:=hround(w_sharp*hppp); h:=vround(h_sharp*hppp); d:=vround(d_sharp*hppp);
  charwd:=w_sharp; charht:=max(charht,h_sharp); chardp:=max(chardp,d_sharp);
  picture first.glyph; first.glyph=currentpicture;
  clearxy; clearpen; clearit; clearpen;
enddef;
     
def endchar =
  if is_double :
    charwd:=first.charwd+charwd;
    picture second_glyph; second_glyph=currentpicture shifted (first.r-l,0);
    currentpicture:= first.glyph; addto currentpicture also second_glyph;
    scantokens extra_endchar;
    w:=first.w+w; r:=first.r-l+r; l:=first.l;
    chardx:=first.w+w; interim xoffset:= -l;
    if proofing>0: makebox(proofrule); fi
    shipit;
    if displaying>0: makebox(screenrule); showit; fi
    endgroup;
    is_double:=false
  else : oldendchar
  fi
enddef;
     
%By convention, we reserve the name z1' for the direction at z1, and so on.
%The direction at z1r is z1'r, or zdir1r.
vardef zdir[]@#= z@'@# enddef;
vardef assign_z@#(expr zz)= x@#:=xpart(zz); y@#:=ypart(zz) enddef;
vardef sgn(expr x)= if (x>0): 1 elseif (x<0): -1 else: 0 fi enddef;
     
vardef double_circ_stroke text t =
 forsuffixes e = l,r: path_.e:=t; endfor
 if cycle path_.l: errmessage "Beware: `stroke' isn't intended for cycles"; fi
 path_.l .. reverse path_.r .. cycle enddef;
     
vardef drawloop(suffix $,$$,@@,@)=
  numeric temp[], sup;
  sup=superness;
  forsuffixes e=r,l:
    path curv[]e; numeric S[]e;
    curv1e=pulled_super_arc.e($,$$)(.5superpull);
    curv2e=pulled_super_arc.e(@,@@)(.5superpull); endfor
  (S1r,S2r)=curv1r intersectiontimes curv2r;
  (temp1,S2l)=curv1r intersectiontimes curv2l;
  (S1l,temp2)=curv1l intersectiontimes curv2r;
  for i=1 upto 9:
    exitif (temp1>=S1r) and (temp2>=S2r);
    begingroup
      numeric S[]r, S[]l, temp[]; pair p;
      interim superness:=(i/10)[sup,1];
      message"change in superness required; increased to "; show superness;
      curv1r:=pulled_super_arc.r($,$$)(0);
      curv2r:=pulled_super_arc.r(@,@@)(0);
      (S1r,S2r)=curv1r intersectiontimes curv2r;
      (temp1,S2l)=curv1r intersectiontimes curv2l;
      (S1l,temp2)=curv1l intersectiontimes curv2r;
    endgroup;
  endfor;
  if S1l=-1 : S1l:=2; fi
  if S2l=-1 : S2l:=2; fi
  filldraw stroke subpath(0,S1e+eps) of curv1e;
  filldraw stroke subpath(0,S2e+eps) of curv2e;
  filldraw subpath (S1r+eps,2) of curv1r...subpath(2,S2r+eps) of curv2r..cycle;
enddef ;
     
vardef gr_arc.r(suffix $,$$,$$$)(expr min,max,tilt)=
  pair center, corner;
  if (y$$$r-y$r)*(x$$$r-x$r) < 0 :      %first or third quadrant
    center=(x$$$r,y$r); corner=(x$r,y$$$r);
  else :
    center=(x$r,y$$$r); corner=(x$$$r,y$r);
  fi
  z$r{corner-z$r}...superness[center,corner]{z$$$r-z$r}...
    {z$$$r-corner}z$$$r
enddef;
     
vardef gr_arc.l(suffix $,$$,$$$)(expr min,max,tilt)=
  save p,q,wdth;
  pair center, corner, temp;
  numeric wdth, t, s;
  path p,q;
  if (y$$$r-y$r)*(x$$$r-x$r) < 0 :      %first or third quadrant
    center=(x$$$r,y$r); corner=(x$r,y$$$r);
    if tilt>=0 : wdth:=min; other_wdth:=max; t:=2(1-tilt);
    else : wdth:=max; other_wdth:=min; t:=-2tilt; fi
  else :
    center=(x$r,y$$$r); corner=(x$$$r,y$r);
    if tilt>=0 : wdth:=max; other_wdth:=min; t:=2(1-tilt);
    else : wdth:=min; other_wdth:=max; t:=-2tilt; fi
  fi
  p:=z$r{corner-z$r}...superness[center,corner]{z$$$r-z$r}...
    {z$$$r-corner}z$$$r;
  pos$$(wdth,angle direction t of p - 90);
  z$$r=point t of p;
  assign_z$$'l(direction t of p);
  assign_z$$'r(z$$'l);
  if other_wdth<=currentbreadth: errmessage "bad pos"; fi
  temp:=point (2-t) of p-
    (other_wdth-currentbreadth,0) rotated (angle direction (2-t) of p - 90);
  boolean k[]; k1:=false; k2:=false;
  if unknown x$l:
    k1:=true;
    assign_z$l(temp);
    assign_z$'l(direction(2-t) of p);
    if (y$$$r-y$r)*(x$$$r-x$r) < 0 :    %first or third quadrant
      y$l:=2ypart center-y$l;
      x$'l:=-x$'l;
    else:
      x$l:=2xpart center-x$l;
      y$'l:=-y$'l;
    fi
  fi
  if unknown x$$$l:
    k2:=true;
    assign_z$$$l(temp);
    assign_z$$$'l(direction(2-t) of p);
    if (y$$$r-y$r)*(x$$$r-x$r) < 0 :    %first or third quadrant
      x$$$l:=2xpart center-x$$$l;
      y$$$'l:=-y$$$'l;
    else:
      y$$$l:=2ypart center-y$$$l;
      x$$$'l:=-x$$$'l;
    fi
  fi
  q:=z$l{z$'l}...z$$l{z$$'l}...z$$$l{z$$$'l};
  if k1 :
    t := xpart(q intersectiontimes (center---z$r));
    if t=-1 : t:=0; fi
    assign_z$l(point t of q);
    assign_z$'l(direction t of q);
    assign_z$'r(corner-z$r);
    z$l+z$r=2z$;
  else: t:=0;
  fi
  if k2 :
    s := xpart(q intersectiontimes (center---z$$$r));
    if s=-1 : s:=2; fi
    assign_z$$$l(point s of q);
    assign_z$$$'l(direction s of q);
    assign_z$$$'r(z$$$r-corner);
    z$$$l+z$$$r=2z$$$;
  else: s:=2;
  fi
  subpath (t,s) of q
enddef;
     
vardef doodah(suffix $,$$,$$$)=
 if known x$$:
  vardef ward(expr gr)=
   sgn(xpart direction 1 of (z${zdir$}..(x$$,gr)..{zdir$$$}z$$$)) <> sgn(x$-x$$)
  enddef;
  y$$=solve ward(y$,y$$$);
 else:
  vardef ward(expr gr)=
   sgn(ypart direction 1 of (z${zdir$}..(gr,y$$)..{zdir$$$}z$$$)) <> sgn(y$-y$$)
  enddef;
  x$$=solve ward(x$,x$$$);
 fi
 (z${zdir$}..z$$..{zdir$$$}z$$$)
enddef;
     
forsuffixes e=r,l:
  vardef club.e(suffix $,$$,$$$)= doodah($e,$$e,$$$e) enddef; endfor
     
screen_rows:=600; screen_cols:=1000;
     
vardef alpha_tail(suffix $,$$) =
  pos$$(hair,180); top y$$=vround 4/3[bot y$l,top y$r];         %tip of hook
  rt x$$l=hround(x$+(y$$-y$)+.5hair);                   %central arc is round
enddef;
     
vardef pi_bar =
  pos3(vstem,-90); rt x3=hround(w-.75u); top y3l=x_height;      %top right
  pos2(vstem,-90); y2=y3; x2=.25w;                              %top left
  x1-.5hair=hround.75u; y1-.5hair=4/3[top y2l,bot y2r];         %tip of bar
  numeric slope; slope=angle((z2-z1)yscaled 2); pos1(hair,slope-90);
  forsuffixes e=l,r: z1'e=(z2e-z1e)yscaled 2; endfor
  filldraw circ_stroke z1e{z1'e}...z2e---z3e;           %bar
enddef;