mirror of https://github.com/MISP/MISP
117 lines
3.2 KiB
PHP
117 lines
3.2 KiB
PHP
<?php
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class ColourPaletteTool
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{
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/**
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* @param int $count Pass the number of distinct colours to receive an array of colours
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* @return array
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*/
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public function createColourPalette($count)
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{
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$interval = 1 / $count;
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$colours = array();
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for ($i = 0; $i < $count; $i++) {
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$colours[] = $this->HSVtoRGB(array($interval * $i, 1, 1));
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}
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return $colours;
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}
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/**
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* @param array $hsv
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* @return string
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*/
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public function HSVtoRGB(array $hsv)
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{
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list($H, $S, $V) = $hsv;
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//1
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$H *= 6;
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//2
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$I = floor($H);
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$F = $H - $I;
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//3
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$M = $V * (1 - $S);
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$N = $V * (1 - $S * $F);
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$K = $V * (1 - $S * (1 - $F));
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//4
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switch ($I) {
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case 0:
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list($R, $G, $B) = array($V,$K,$M);
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break;
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case 1:
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list($R, $G, $B) = array($N,$V,$M);
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break;
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case 2:
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list($R, $G, $B) = array($M,$V,$K);
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break;
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case 3:
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list($R, $G, $B) = array($M,$N,$V);
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break;
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case 4:
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list($R, $G, $B) = array($K,$M,$V);
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break;
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case 5:
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case 6: //for when $H=1 is given
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list($R, $G, $B) = array($V,$M,$N);
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break;
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}
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return $this->convertToHex(array($R, $G, $B));
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}
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/**
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* @param array $channels
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* @return string
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*/
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public function convertToHex($channels)
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{
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$colour = '#';
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foreach ($channels as $channel) {
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$channel = dechex(round($channel*255));
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if (strlen($channel) === 1) {
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$channel = '0' . $channel;
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}
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$colour .= $channel;
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}
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return $colour;
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}
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// pass the element's id from the list along to get a colour for a single item
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public function generatePaletteFromString($string, $items, $onlySpecific = false)
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{
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if (Validation::uuid($string)) {
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$hue = $this->__uuidToNumber($string);
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} else {
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$hue = $this->__stringToNumber($string);
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}
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$saturation = 1;
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$steps = 80 / $items;
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$results = array();
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if ($onlySpecific !== false && is_numeric($onlySpecific)) {
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$value = (20 + ($steps * ($onlySpecific + 1))) / 100;
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return $this->HSVtoRGB(array($hue, $saturation, $value));
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}
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for ($i = 0; $i < $items; $i++) {
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$value = (20 + ($steps * ($i + 1))) / 100;
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$rgb = $this->HSVtoRGB(array($hue, $saturation, $value));
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$results[] = $rgb;
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}
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return $results;
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}
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private function __stringToNumber($string)
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{
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$string = mb_convert_encoding($string, 'ASCII');
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$number = 0;
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for ($i = 0; $i < strlen($string); $i++) {
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$number += ord($string[$i]);
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}
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return $number % 100 / 100;
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}
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private function __uuidToNumber($string)
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{
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$part = explode('-', $string)[4];
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$number = hexdec($part);
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$max = hexdec('ffffffffffff');
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return round($number / $max, 2);
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}
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}
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