105 lines
3.0 KiB
PHP
105 lines
3.0 KiB
PHP
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<?php
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/**
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* Class QRImageWithText
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*
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* example for additional text
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*
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* @link https://github.com/chillerlan/php-qrcode/issues/35
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*
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* @filesource QRImageWithText.php
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* @created 22.06.2019
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* @package chillerlan\QRCodeExamples
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* @author smiley <smiley@chillerlan.net>
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* @copyright 2019 smiley
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* @license MIT
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*
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* @noinspection PhpComposerExtensionStubsInspection
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*/
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namespace chillerlan\QRCodeExamples;
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use chillerlan\QRCode\Output\QRImage;
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use function base64_encode, imagechar, imagecolorallocate, imagecolortransparent, imagecopymerge, imagecreatetruecolor,
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imagedestroy, imagefilledrectangle, imagefontwidth, in_array, round, str_split, strlen;
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class QRImageWithText extends QRImage{
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/**
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* @param string|null $file
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* @param string|null $text
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*
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* @return string
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*/
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public function dump(string $file = null, string $text = null):string{
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$this->image = imagecreatetruecolor($this->length, $this->length);
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$background = imagecolorallocate($this->image, ...$this->options->imageTransparencyBG);
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if((bool)$this->options->imageTransparent && in_array($this->options->outputType, $this::TRANSPARENCY_TYPES, true)){
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imagecolortransparent($this->image, $background);
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}
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imagefilledrectangle($this->image, 0, 0, $this->length, $this->length, $background);
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foreach($this->matrix->matrix() as $y => $row){
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foreach($row as $x => $M_TYPE){
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$this->setPixel($x, $y, $this->moduleValues[$M_TYPE]);
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}
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}
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// render text output if a string is given
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if($text !== null){
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$this->addText($text);
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}
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$imageData = $this->dumpImage($file);
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if((bool)$this->options->imageBase64){
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$imageData = 'data:image/'.$this->options->outputType.';base64,'.base64_encode($imageData);
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}
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return $imageData;
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}
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/**
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* @param string $text
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*/
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protected function addText(string $text):void{
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// save the qrcode image
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$qrcode = $this->image;
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// options things
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$textSize = 3; // see imagefontheight() and imagefontwidth()
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$textBG = [200, 200, 200];
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$textColor = [50, 50, 50];
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$bgWidth = $this->length;
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$bgHeight = $bgWidth + 20; // 20px extra space
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// create a new image with additional space
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$this->image = imagecreatetruecolor($bgWidth, $bgHeight);
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$background = imagecolorallocate($this->image, ...$textBG);
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// allow transparency
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if((bool)$this->options->imageTransparent && in_array($this->options->outputType, $this::TRANSPARENCY_TYPES, true)){
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imagecolortransparent($this->image, $background);
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}
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// fill the background
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imagefilledrectangle($this->image, 0, 0, $bgWidth, $bgHeight, $background);
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// copy over the qrcode
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imagecopymerge($this->image, $qrcode, 0, 0, 0, 0, $this->length, $this->length, 100);
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imagedestroy($qrcode);
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$fontColor = imagecolorallocate($this->image, ...$textColor);
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$w = imagefontwidth($textSize);
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$x = round(($bgWidth - strlen($text) * $w) / 2);
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// loop through the string and draw the letters
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foreach(str_split($text) as $i => $chr){
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imagechar($this->image, $textSize, $i * $w + $x, $this->length, $chr, $fontColor);
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}
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}
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}
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