jlourenco\base\Helpers\ColorHelper::adjustBrightness()

Complexity

Conditions	3
Paths	4

Size

Total Lines	22
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	1

<?php
    public static function adjustBrightness($hex, $steps) {
        // Steps should be between -255 and 255. Negative = darker, positive = lighter
        $steps = max(-255, min(255, $steps));

        // Normalize into a six character long hex string
        $hex = str_replace('#', '', $hex);
        if (strlen($hex) == 3) {
            $hex = str_repeat(substr($hex,0,1), 2).str_repeat(substr($hex,1,1), 2).str_repeat(substr($hex,2,1), 2);
        }

        // Split into three parts: R, G and B
        $color_parts = str_split($hex, 2);
        $return = '#';

        foreach ($color_parts as $color) {
            $color   = hexdec($color); // Convert to decimal
            $color   = max(0,min(255,$color + $steps)); // Adjust color
            $return .= str_pad(dechex($color), 2, '0', STR_PAD_LEFT); // Make two char hex code
        }

        return $return;
    }