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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/* Assuming nodes have been positioned by dot, this adds a rank
* attribute by placing all nodes with the same y value on a specific
* integer rank.
* If the graph has rankdir=LR, x and y are flipped.
*/
BEG_G {
double x,y;
int lv[double];
int r, rk[double];
int flip;
if (isAttr($,"G","rankdir") && $.rankdir=="LR") flip = 1;
}
N {
sscanf($.pos,"%f,%f",&x,&y);
if (flip) lv[x] = 1;
else lv[y] = 1;
}
BEG_G {
r = 0;
if (flip)
forr (lv[x]) {
rk[x] = r++;
/* printf (2, "rk[%f] = %d\n", y, rk[y]); */
}
else
forr (lv[y]) {
rk[y] = r++;
/* printf (2, "rk[%f] = %d\n", y, rk[y]); */
}
}
N {
sscanf($.pos,"%f,%f",&x,&y);
/* printf(2, "node %s y %f rk %d\n", $.name, y, rk[y]); */
if (flip) $.rank = sprintf("%d", rk[x]);
else $.rank = sprintf("%d", rk[y]);
}