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<?php
/**
* Class QRImageWithText
*
* example for additional text
*
* @link https://github.com/chillerlan/php-qrcode/issues/35
*
* @filesource QRImageWithText.php
* @created 22.06.2019
* @package chillerlan\QRCodeExamples
* @author smiley <smiley@chillerlan.net>
* @copyright 2019 smiley
* @license MIT
*
* @noinspection PhpComposerExtensionStubsInspection
*/
namespace chillerlan\QRCodeExamples;
use chillerlan\QRCode\Output\QRImage;
use function base64_encode, imagechar, imagecolorallocate, imagecolortransparent, imagecopymerge, imagecreatetruecolor,
imagedestroy, imagefilledrectangle, imagefontwidth, in_array, round, str_split, strlen;
class QRImageWithText extends QRImage{
/**
* @param string|null $file
* @param string|null $text
*
* @return string
*/
public function dump(string $file = null, string $text = null):string{
// set returnResource to true to skip further processing for now
$this->options->returnResource = true;
// there's no need to save the result of dump() into $this->image here
parent::dump($file);
// render text output if a string is given
if($text !== null){
$this->addText($text);
}
$imageData = $this->dumpImage();
if($file !== null){
$this->saveToFile($imageData, $file);
}
if($this->options->imageBase64){
$imageData = 'data:image/'.$this->options->outputType.';base64,'.base64_encode($imageData);
}
return $imageData;
}
/**
* @param string $text
*/
protected function addText(string $text):void{
// save the qrcode image
$qrcode = $this->image;
// options things
$textSize = 3; // see imagefontheight() and imagefontwidth()
$textBG = [200, 200, 200];
$textColor = [50, 50, 50];
$bgWidth = $this->length;
$bgHeight = $bgWidth + 20; // 20px extra space
// create a new image with additional space
$this->image = imagecreatetruecolor($bgWidth, $bgHeight);
$background = imagecolorallocate($this->image, ...$textBG);
// allow transparency
if($this->options->imageTransparent && in_array($this->options->outputType, $this::TRANSPARENCY_TYPES, true)){
imagecolortransparent($this->image, $background);
}
// fill the background
imagefilledrectangle($this->image, 0, 0, $bgWidth, $bgHeight, $background);
// copy over the qrcode
imagecopymerge($this->image, $qrcode, 0, 0, 0, 0, $this->length, $this->length, 100);
imagedestroy($qrcode);
$fontColor = imagecolorallocate($this->image, ...$textColor);
$w = imagefontwidth($textSize);
$x = round(($bgWidth - strlen($text) * $w) / 2);
// loop through the string and draw the letters
foreach(str_split($text) as $i => $chr){
imagechar($this->image, $textSize, (int)($i * $w + $x), $this->length, $chr, $fontColor);
}
}
}
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