Color class for Kohana

color.php

<?php defined('SYSPATH') or die('No direct script access.');

class Color {
    
    public static function hex_to_rgb($hex){
        $pattern = '/^#?(\w{1,2})(\w{1,2})(\w{1,2})$/';
        preg_match($pattern, $hex, $matches);
        $matches = array_slice($matches, 1);
        if (!function_exists('map')){
            function map($value){
                if (strlen($value) == 1) $value += $value;
                return base_convert($value, 16, 10);
            }
        }
        $rgb = array_map('map', $matches);
        return $rgb;
    }
    
    public static function hsb_to_rgb($hsb){
        $br = round($hsb[2] / 100 * 255);
        if ($hsb[1] == 0){
            return array($br, $br, $br);
        } else {
            $hue = $hsb[0] % 360;
            $f = $hue % 60;
            $p = round(($hsb[2] * (100 - $hsb[1])) / 10000 * 255);
            $q = round(($hsb[2] * (6000 - $hsb[1] * $f)) / 600000 * 255);
            $t = round(($hsb[2] * (6000 - $hsb[1] * (60 - $f))) / 600000 * 255);
            switch (floor($hue / 60)){
                case 0: return array($br, $t, $p);
                case 1: return array($q, $br, $p);
                case 2: return array($p, $br, $t);
                case 3: return array($p, $q, $br);
                case 4: return array($t, $p, $br);
                case 5: return array($br, $p, $q);
            }
        }
        return false;
    }
    
    public static function rgb_to_hsb($rgb){
        $red = $rgb[0];
        $green = $rgb[1];
        $blue = $rgb[2];
        $hue = 0;
        $max = max($red, $green, $blue);
        $min = min($red, $green, $blue);
        $delta = $max - $min;
        $brightness = $max / 255;
        $saturation = ($max != 0) ? $delta/$max : 0;
        if ($saturation != 0){
            $rr = ($max - $red) / $delta;
            $gr = ($max - $green) / $delta;
            $br = ($max - $blue) / $delta;
            if ($red == $max) $hue = $br - $gr;
            else if ($green == $max) $hue = 2 + $rr - $br;
            else $hue = 4 + $gr - $rr;
            $hue /= 6;
            if ($hue < 0) $hue++;
        }
        return array(round($hue * 260), round($saturation * 100), round($brightness * 100));
    }
    
    public static function hsb_to_hex($hsb){
        $rgb = Color::hsb_to_rgb($hsb);
        return ($rgb) ? Color::rgb_to_hex($rgb) : false;
    }
    
    public static function rgb_to_hex($rgb){
        $r = dechex($rgb[0]);
        $g = dechex($rgb[1]);
        $b = dechex($rgb[2]);
        return '#' . strtoupper($r . $g . $b);
    }
    
    public static function text_to_hex($text, $brightness=100){
        $hex = substr(md5($text), 0, 6);
        $rgb = color::hex_to_rgb($hex);
        $hsb = color::rgb_to_hsb($rgb);
        if ($hsb[1] > 50){
            $hsb[0] -= 10;
            $hsb[1] -= 30;
        } else {
            $hsb[0] += 10;
            $hsb[1] += 10;
        }
        $hsb[2] = $brightness;
        $hex = color::hsb_to_hex($hsb);
        return $hex;
    }

}
 
?>