晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Directory :  /usr/share/graphviz/gvpr/

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Current File : //usr/share/graphviz/gvpr/scalexy
/* finds root node of graph.
 * scales the x and y position of all other nodes using, first,
 * ARGV[0], or $G.scale.
 * 
 * The expected syntax is "x,y" where at least one of x or y must
 * be given. If only one is given, the other is taken as 1.
 */
BEGIN {
  double scalex, scaley;
  int r, done;

  int setScale (char* s) 
  {
    if ((sscanf (s, ",%f",&scaley))) {
        scalex = 1;
        return 1;
    }
    else {
      r = sscanf (s, "%f,%f",&scalex,&scaley);
      if (r) {
        if (r == 1) scaley = 1;
        return 1;
      }
    }
    return 0;
  }

}

BEG_G {
  node_t ctr = node($,aget($,"root"));
  double cx, cy, x, y, delx;
  
  /* get scale argument */
  done = 0;
  if (ARGC == 1)
    done = setScale (ARGV[0]);
  if (!done && isAttr($,"G","scale"))
    done = setScale ($.scale);
  if (!done)
    scalex = scaley = 1.0;

  if ((scalex == 1.0) && (scaley == 1.0))
    exit (0);

  $.bb = "";
  sscanf (ctr.pos, "%f,%f", &cx, &cy);
}
N [$ != ctr] {
    sscanf ($.pos, "%f,%f", &x, &y);
    delx = scalex*(x - cx) + cx;
    dely = scaley*(y - cy) + cy;
    $.pos = sprintf ("%f,%f", delx, dely);
}

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