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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\Image;
use BaconQrCode\Exception;
use BaconQrCode\Renderer\Color\ColorInterface;
/**
* PNG backend.
*/
class Png extends AbstractRenderer
{
/**
* Image resource used when drawing.
*
* @var resource
*/
protected $image;
/**
* Colors used for drawing.
*
* @var array
*/
protected $colors = array();
/**
* init(): defined by RendererInterface.
*
* @see ImageRendererInterface::init()
* @return void
*/
public function init()
{
$this->image = imagecreatetruecolor($this->finalWidth, $this->finalHeight);
}
/**
* addColor(): defined by RendererInterface.
*
* @see ImageRendererInterface::addColor()
* @param string $id
* @param ColorInterface $color
* @return void
* @throws Exception\RuntimeException
*/
public function addColor($id, ColorInterface $color)
{
if ($this->image === null) {
throw new Exception\RuntimeException('Colors can only be added after init');
}
$color = $color->toRgb();
$this->colors[$id] = imagecolorallocate(
$this->image,
$color->getRed(),
$color->getGreen(),
$color->getBlue()
);
}
/**
* drawBackground(): defined by RendererInterface.
*
* @see ImageRendererInterface::drawBackground()
* @param string $colorId
* @return void
*/
public function drawBackground($colorId)
{
imagefill($this->image, 0, 0, $this->colors[$colorId]);
}
/**
* drawBlock(): defined by RendererInterface.
*
* @see ImageRendererInterface::drawBlock()
* @param integer $x
* @param integer $y
* @param string $colorId
* @return void
*/
public function drawBlock($x, $y, $colorId)
{
imagefilledrectangle(
$this->image,
$x,
$y,
$x + $this->blockSize - 1,
$y + $this->blockSize - 1,
$this->colors[$colorId]
);
}
/**
* getByteStream(): defined by RendererInterface.
*
* @see ImageRendererInterface::getByteStream()
* @return string
*/
public function getByteStream()
{
ob_start();
imagepng($this->image);
return ob_get_clean();
}
}