logo image example (#52)

Author: codemasher

examples/QRImageWithLogo.php

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+<?php
+/**
+ * Class QRImageWithLogo
+ *
+ * @filesource   QRImageWithLogo.php
+ * @created      18.11.2020
+ * @package      chillerlan\QRCodeExamples
+ * @author       smiley <[email protected]>
+ * @copyright    2020 smiley
+ * @license      MIT
+ *
+ * @noinspection PhpComposerExtensionStubsInspection
+ */
+
+namespace chillerlan\QRCodeExamples;
+
+use chillerlan\QRCode\Output\{QRCodeOutputException, QRImage};
+
+use function imagecopyresampled, imagecreatefrompng, imagesx, imagesy, is_file, is_readable;
+
+/**
+ * @property \chillerlan\QRCodeExamples\LogoOptions $options
+ */
+class QRImageWithLogo extends QRImage{
+
+	/**
+	 * @param string|null $file
+	 * @param string|null $logo
+	 *
+	 * @return string
+	 * @throws \chillerlan\QRCode\Output\QRCodeOutputException
+	 */
+	public function dump(string $file = null, string $logo = null):string{
+		// set returnResource to true to skip further processing for now
+		$this->options->returnResource = true;
+
+		// of course you could accept other formats too (such as resource or Imagick)
+		// i'm not checking for the file type either for simplicity reasons (assuming PNG)
+		if(!is_file($logo) || !is_readable($logo)){
+			throw new QRCodeOutputException('invalid logo');
+		}
+
+		$this->matrix->setLogoSpace(
+			$this->options->logoWidth,
+			$this->options->logoHeight
+		// not utilizing the position here
+		);
+
+		// there's no need to save the result of dump() into $this->image here
+		parent::dump($file);
+
+		$im = imagecreatefrompng($logo);
+
+		// get logo image size
+		$w = imagesx($im);
+		$h = imagesy($im);
+
+		// set new logo size, leave a border of 1 module
+		$lw = ($this->options->logoWidth - 2) * $this->options->scale;
+		$lh = ($this->options->logoHeight - 2) * $this->options->scale;
+
+		// get the qrcode size
+		$ql = $this->matrix->size() * $this->options->scale;
+
+		// scale the logo and copy it over. done!
+		imagecopyresampled($this->image, $im, ($ql - $lw) / 2, ($ql - $lh) / 2, 0, 0, $lw, $lh, $w, $h);
+
+		$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;
+	}
+
+}

examples/imageWithLogo.php

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+<?php
+/**
+ *
+ * @filesource   imageWithLogo.php
+ * @created      18.11.2020
+ * @author       smiley <[email protected]>
+ * @copyright    2020 smiley
+ * @license      MIT
+ */
+
+namespace chillerlan\QRCodeExamples;
+
+use chillerlan\QRCode\{QRCode, QROptions};
+
+require_once __DIR__.'/../vendor/autoload.php';
+
+$data = 'https://www.youtube.com/watch?v=DLzxrzFCyOs&t=43s';
+/**
+ * @property int $logoWidth
+ * @property int $logoHeight
+ *
+ * @noinspection PhpIllegalPsrClassPathInspection
+ */
+class LogoOptions extends QROptions{
+	protected int $logoWidth;
+	protected int $logoHeight;
+}
+
+$options = new LogoOptions;
+
+$options->version          = 7;
+$options->eccLevel         = QRCode::ECC_H;
+$options->imageBase64      = false;
+$options->logoWidth        = 13;
+$options->logoHeight       = 13;
+$options->scale            = 5;
+$options->imageTransparent = false;
+
+header('Content-type: image/png');
+
+$qrOutputInterface = new QRImageWithLogo($options, (new QRCode($options))->getMatrix($data));
+
+// dump the output, with an additional logo
+echo $qrOutputInterface->dump(null, __DIR__.'/octocat.png');