mdw@git.distorted.org.uk Git - dnd/blob - graph.mp

   1 numeric paperh, paperw;
   2 numeric fine;
   3 numeric margin;
   4
   5 paperh := 297 mm;
   6 paperw := 210 mm;
   7 fine := 1/4 pt;
   8 margin := 20 mm;
   9
  10 numeric page; page := 0;
  11
  12 def squares(expr hsqsz, vsqsz) =
  13   page := page + 1;
  14   beginfig(page);
  15     numeric w, h;
  16     numeric ox, oy, lx, ly;
  17
  18     w = floor((paperw - 2 margin)/hsqsz);
  19     h = floor((paperh - 2 margin)/vsqsz);
  20     ox = (paperw - w * hsqsz)/2; lx = ox + w * hsqsz;
  21     oy = (paperh - h * vsqsz)/2; ly = oy + h * vsqsz;
  22
  23     pickup pencircle scaled fine;
  24     for i = ox step hsqsz until lx:
  25       draw (i, oy) .. (i, ly);
  26     endfor
  27     for i = oy step vsqsz until ly:
  28       draw (ox, i) .. (lx, i);
  29     endfor
  30   endfig;
  31 enddef;
  32
  33 def hexes(expr hexsz) =
  34   page := page + 1;
  35   beginfig(page);
  36     numeric ox, oy, lx, ly;
  37     numeric w, h;
  38     numeric v;
  39     numeric a, b, c, d, e;
  40
  41     v = hexsz * sind 60;
  42     w = floor((paperw - 2 margin)/(3 hexsz) - 1/2);
  43     h = floor((paperh - 2 margin)/(2 v) - 1/2);
  44     ox = (paperw - (w + 1/2) * 3 hexsz)/2; lx = ox + w * 3 hexsz;
  45     oy = (paperh - (h + 1/2) * 2 v)/2; ly = oy + h * 2 v;
  46
  47     pickup pencircle scaled fine;
  48     for i = ox step 3 hexsz until lx:
  49       a := i + 1/2 hexsz; b := i + 2 hexsz; c := i + 3/2 hexsz;
  50       for j = oy step 2 v until ly:
  51         d := j + v; e := j + 2 v;
  52         draw (a, e) -- (i, d) -- (a, j) -- (c, j) -- (b, d) -- (c, e);
  53         if i < lx:
  54           draw (b, d) -- (b + hexsz, d);
  55         fi
  56       endfor
  57       draw (a, e) -- (c, e);
  58     endfor
  59   endfig;
  60 enddef;