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<?php
namespace SimpleSoftwareIO\QrCode;
class ImageMerge implements ImageMergeInterface
{
/**
* Holds the QrCode image.
*
* @var Image
*/
protected $sourceImage;
/**
* Holds the merging image.
*
* @var Image
*/
protected $mergeImage;
/**
* The height of the source image.
*
* @var int
*/
protected $sourceImageHeight;
/**
* The width of the source image.
*
* @var int
*/
protected $sourceImageWidth;
/**
* The height of the merge image.
*
* @var int
*/
protected $mergeImageHeight;
/**
* The width of the merge image.
*
* @var int
*/
protected $mergeImageWidth;
/**
* The height of the merge image after it is merged.
*
* @var int
*/
protected $postMergeImageHeight;
/**
* The width of the merge image after it is merged.
*
* @var int
*/
protected $postMergeImageWidth;
/**
* The position that the merge image is placed on top of the source image.
*
* @var int
*/
protected $centerY;
/**
* The position that the merge image is placed on top of the source image.
*
* @var int
*/
protected $centerX;
/**
* Creates a new ImageMerge object.
*
* @param $sourceImage Image The image that will be merged over.
* @param $mergeImage Image The image that will be used to merge with $sourceImage
*/
public function __construct(Image $sourceImage, Image $mergeImage)
{
$this->sourceImage = $sourceImage;
$this->mergeImage = $mergeImage;
}
/**
* Returns an QrCode that has been merge with another image.
* This is usually used with logos to imprint a logo into a QrCode.
*
* @param $percentage float The percentage of size relative to the entire QR of the merged image
*
* @return string
*/
public function merge($percentage)
{
$this->setProperties($percentage);
imagecopyresampled(
$this->sourceImage->getImageResource(),
$this->mergeImage->getImageResource(),
$this->centerX,
$this->centerY,
0,
0,
$this->postMergeImageWidth,
$this->postMergeImageHeight,
$this->mergeImageWidth,
$this->mergeImageHeight
);
return $this->createImage();
}
/**
* Creates a PNG Image.
*
* @return string
*/
protected function createImage()
{
ob_start();
imagepng($this->sourceImage->getImageResource());
return ob_get_clean();
}
/**
* Sets the objects properties.
*
* @param $percentage float The percentage that the merge image should take up.
*/
protected function setProperties($percentage)
{
if ($percentage > 1) {
throw new \InvalidArgumentException('$percentage must be less than 1');
}
$this->sourceImageHeight = $this->sourceImage->getHeight();
$this->sourceImageWidth = $this->sourceImage->getWidth();
$this->mergeImageHeight = $this->mergeImage->getHeight();
$this->mergeImageWidth = $this->mergeImage->getWidth();
$this->calculateOverlap($percentage);
$this->calculateCenter();
}
/**
* Calculates the center of the source Image using the Merge image.
*/
private function calculateCenter()
{
$this->centerY = ($this->sourceImageHeight / 2) - ($this->postMergeImageHeight / 2);
$this->centerX = ($this->sourceImageWidth / 2) - ($this->postMergeImageHeight / 2);
}
/**
* Calculates the width of the merge image being placed on the source image.
*
* @param float $percentage
*/
private function calculateOverlap($percentage)
{
$this->postMergeImageHeight = $this->sourceImageHeight * $percentage;
$this->postMergeImageWidth = $this->sourceImageWidth * $percentage;
}
}