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

Complexity

Conditions	3
Paths	4

Size

Total Lines	23
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Importance

Changes	3
Bugs	0	Features	2

<?php namespace jlourenco\support\Helpers;

    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;

    }