35 lines
872 B
PHP
35 lines
872 B
PHP
<?php
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namespace OCA\SideMenu\Service;
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/**
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* class Color.
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*
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* @author Simon Vieille <simon@deblan.fr>
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*/
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class Color
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{
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/**
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* @thanks https://stackoverflow.com/posts/54393956/revision
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*/
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public function adjustBrightness(string $hexCode, float $adjustPercent): string
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{
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$hexCode = ltrim($hexCode, '#');
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if (3 == strlen($hexCode)) {
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$hexCode = $hexCode[0].$hexCode[0].$hexCode[1].$hexCode[1].$hexCode[2].$hexCode[2];
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}
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$hexCode = array_map('hexdec', str_split($hexCode, 2));
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foreach ($hexCode as &$color) {
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$adjustableLimit = $adjustPercent < 0 ? $color : 255 - $color;
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$adjustAmount = ceil($adjustableLimit * $adjustPercent);
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$color = str_pad(dechex($color + $adjustAmount), 2, '0', STR_PAD_LEFT);
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}
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return '#'.implode($hexCode);
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}
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}
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