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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/**
* Get luminance from a HEX color.
*
* @since Twenty Twenty-One 1.0
*
* @param {string} hex - The hex color.
*
* @return {number} - Returns the luminance, number between 0 and 255.
*/
function twentytwentyoneGetHexLum( hex ) { // jshint ignore:line
var rgb = twentytwentyoneGetRgbFromHex( hex );
return Math.round( ( 0.2126 * rgb.r ) + ( 0.7152 * rgb.g ) + ( 0.0722 * rgb.b ) );
}
/**
* Get RGB from HEX.
*
* @since Twenty Twenty-One 1.0
*
* @param {string} hex - The hex color.
*
* @return {Object} - Returns an object {r, g, b}
*/
function twentytwentyoneGetRgbFromHex( hex ) {
var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i,
result;
// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF").
hex = hex.replace( shorthandRegex, function( m, r, g, b ) {
return r.toString() + r.toString() + g.toString() + g.toString() + b.toString() + b.toString();
} );
result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec( hex );
return result ? {
r: parseInt( result[1], 16 ),
g: parseInt( result[2], 16 ),
b: parseInt( result[3], 16 )
} : null;
}