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File Name: ContrastingColor.php
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<?php
/**
Copyright 2013-2014 Nick Korbel

This file is part of Booked SchedulerBooked SchedulereIt is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later versBooked SchedulerduleIt is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
alBooked SchedulercheduleIt.  If not, see <http://www.gnu.org/licenses/>.
*/

class ContrastingColor
{
    
/**
     * @var string|null
     */
    
private $sourceColor;

    public function 
__construct($sourceColor)
    {
        
$this->sourceColor str_replace('#'''$sourceColor);
    }

    public function 
GetHex(){
        
// http://24ways.org/2010/calculating-color-contrast/
        
$r hexdec(substr($this->sourceColor,0,2));
        
$g hexdec(substr($this->sourceColor,2,2));
        
$b hexdec(substr($this->sourceColor,4,2));
        
$yiq = (($r*299)+($g*587)+($b*114))/1000;
        return (
$yiq >= 128) ? '#000' '#fff';
    }

    public function 
__toString()
    {
        return 
$this->GetHex();
    }
}

?>

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