40 lines
873 B
PHP
40 lines
873 B
PHP
<?php
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/**
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颜色操作
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*/
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class colorChajian extends Chajian{
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/**
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颜色
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*/
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public function color($color,$l=127.5)
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{
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$r=hexdec(substr($color,1,2));
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$g=hexdec(substr($color,3,2));
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$b=hexdec(substr($color,5));
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$yb=127.5;
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if($l > $yb){
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$l = $l - $yb;
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$r = ($r * ($yb - $l) + 255 * $l) / $yb;
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$g = ($g * ($yb - $l) + 255 * $l) / $yb;
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$b = ($b * ($yb - $l) + 255 * $l) / $yb;
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}else{
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$r = ($r * $l) / $yb;
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$g = ($g * $l) / $yb;
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$b = ($b * $l) / $yb;
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}
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$nr=$this->tohex($r);
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$ng=$this->tohex($g);
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$nb=$this->tohex($b);
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return '#'.$nr.$ng.$nb;
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}
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private function tohex($n)
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{
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$hexch = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
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$n = round($n);
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$l = $n % 16;
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$h = floor(($n / 16)) % 16;
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return ''.$hexch[$h].''.$hexch[$l].'';
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}
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} |