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　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。 . Prv8 Shell

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Current File : //proc/thread-self/root/usr/share/graphviz/gvpr/rotate

/* Given node name and angle, rotate a layout using the given
 * node as origin.
 */

BEGIN {
  double x,y;
  double x0,y0;
  double x1,y1;
  double angle, cosa, sina;
  int cnt, sz;

  void rotate (double a, double b) {
    a -= x0;
    b -= y0;
    x1 = a*cosa - b*sina;
    y1 = a*sina + b*cosa;
  }
  char* rotateE (char* p) {
    char* newpos = "";
    cnt = sscanf (p, "e,%lf,%lf%n", &x, &y, &sz);
    if (cnt == 2) {
      rotate (x,y);
      newpos = newpos + sprintf ("e%lf,%lf ", x1, y1);
      p = substr(p, sz);
    }
    cnt = sscanf (p, "s,%lf,%lf%n", &x, &y, &sz);
    if (cnt == 2) {
      rotate (x,y);
      newpos = newpos + sprintf ("s%lf,%lf ", x1, y1);
      p = substr(p, sz);
    }

    while (sscanf (p, "%lf,%lf%n", &x, &y, &sz) == 2) {
      rotate (x,y);
      newpos = newpos + sprintf ("%lf,%lf ", x1, y1);
      p = substr(p, sz);
    }

    return newpos;
  }
}

BEG_G {
  node_t ctr = node ($, ARGV[0]);

  sscanf (ARGV[1], "%f", &angle);
  cosa = cos(angle);
  sina = sin(angle);

  sscanf (ctr.pos, "%f,%f", &x0, &y0);
  $.bb ="";
}
N {
  sscanf ($.pos, "%f,%f", &x, &y);
  rotate (x,y);
  $.pos = sprintf ("%f,%f", x1, y1);
}
E {
  $.pos = rotateE($.pos);
}

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