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<?php
/**
* BaconQrCode
*
* @link http://github.com/Bacon/BaconQrCode For the canonical source repository
* @copyright 2013 Ben 'DASPRiD' Scholzen
* @license http://opensource.org/licenses/BSD-2-Clause Simplified BSD License
*/
namespace BaconQrCode\Renderer\Color;
use BaconQrCode\Exception;
/**
* RGB color.
*/
class Rgb implements ColorInterface
{
/**
* Red value.
*
* @var integer
*/
protected $red;
/**
* Green value.
*
* @var integer
*/
protected $green;
/**
* Blue value.
*
* @var integer
*/
protected $blue;
/**
* Creates a new RGB color.
*
* @param integer $red
* @param integer $green
* @param integer $blue
*/
public function __construct($red, $green, $blue)
{
if ($red < 0 || $red > 255) {
throw new Exception\InvalidArgumentException('Red must be between 0 and 255');
}
if ($green < 0 || $green > 255) {
throw new Exception\InvalidArgumentException('Green must be between 0 and 255');
}
if ($blue < 0 || $blue > 255) {
throw new Exception\InvalidArgumentException('Blue must be between 0 and 255');
}
$this->red = (int) $red;
$this->green = (int) $green;
$this->blue = (int) $blue;
}
/**
* Returns the red value.
*
* @return integer
*/
public function getRed()
{
return $this->red;
}
/**
* Returns the green value.
*
* @return integer
*/
public function getGreen()
{
return $this->green;
}
/**
* Returns the blue value.
*
* @return integer
*/
public function getBlue()
{
return $this->blue;
}
/**
* Returns a hexadecimal string representation of the RGB value.
*
* @return string
*/
public function __toString()
{
return sprintf('%02x%02x%02x', $this->red, $this->green, $this->blue);
}
/**
* toRgb(): defined by ColorInterface.
*
* @see ColorInterface::toRgb()
* @return Rgb
*/
public function toRgb()
{
return $this;
}
/**
* toCmyk(): defined by ColorInterface.
*
* @see ColorInterface::toCmyk()
* @return Cmyk
*/
public function toCmyk()
{
$c = 1 - ($this->red / 255);
$m = 1 - ($this->green / 255);
$y = 1 - ($this->blue / 255);
$k = min($c, $m, $y);
return new Cmyk(
100 * ($c - $k) / (1 - $k),
100 * ($m - $k) / (1 - $k),
100 * ($y - $k) / (1 - $k),
100 * $k
);
}
/**
* toGray(): defined by ColorInterface.
*
* @see ColorInterface::toGray()
* @return Gray
*/
public function toGray()
{
return new Gray(($this->red * 0.21 + $this->green * 0.71 + $this->blue * 0.07) / 2.55);
}
}