Rounded Corners SVG QR Code in PHP

gistfile1.txt

<?php

/**
 * This code generates an SVG QR code with rounded corners. It uses a round rect for each square and then additional
 * paths to fill in the gap where squares are next to each other. Adjacent squares overlap - to almost completely
 * eliminate hairline antialias "cracks" that tend to appear when two SVG paths are exactly adjacent to each other.
 * 
 * composer require chillerlan/php-qrcode (tested with version 4.2)
 */

use chillerlan\QRCode\{QRCode, QROptions};
use chillerlan\QRCode\Output\QROutputAbstract;

require 'vendor/autoload.php';

class RoundedCornerSVGQRCodeOutput extends QROutputAbstract {

	
	
  public function dump(string $file = null)
  {
		$output = $this->openSvg();
    
    // main square with rounded corners
    $output .= $this->symbolWithPath('s', 100, 100, 'M0 30 Q0,0 30,0 L70 0 Q100,0 100,30 L100 70 Q100,100 70,100 L30 100 Q0,100 0,70 Z');
    
    // "plus" to invert the corner radius
    $output .= $this->symbolWithPaths('p', 120, 120, [
      'M30 60 Q58,58 60,30 Q62,58 90,60 Q62,62 60,90 Q58,61 30,60 Z', // a curved plus, radius slightly righter than the main square
      'M60 0 L61 59 L120 60 L61 61 L60 120 L59 61 L0 60 L59 59 Z' // a sharp plus (with points further out logner than the curved one)
    ]);
    
    // top/left/bottom/right triangles fill in edges
    $output .= $this->symbolWithPath('t', 60, 90, 'M0 30 L60 30 L30 90 Z');
    $output .= $this->symbolWithPath('l', 60, 60, 'M60 0 L0 30 L60 60 Z');
    $output .= $this->symbolWithPath('b', 60, 60, 'M0 60 L60 60 L30 0 Z');
    $output .= $this->symbolWithPath('r', 120, 60, 'M30 0 L120 30 L30 60 Z');
    
    // a daimond to fill in block areas
    $output .= $this->symbolWithPath('d', 120, 120, 'M60 0 L120 60 L60 120 L0 60 Z');
    
    $chk = function($col, $r) {
      return $this->matrix->check($col, $r);
    };
    
    $use = function($node, $x, $y) {
      return "<use href=\"#$node\" x=\"$x\" y=\"$y\" />\n";
    };
    
		for($r = 0; $r < $this->moduleCount; $r++){
			for($c = 0; $c < $this->moduleCount; $c++){
        if (!$chk($c, $r)) {
          continue;
        }
        
        // prep
        $cMin = ($c == 0);
        $rMin = ($r == 0);
        $cMax = $c == ($this->moduleCount - 1);
        $rMax = $r == ($this->moduleCount - 1);
        
        // main square block
        $output .= $use(
          's',
          ($c * 100),
          ($r * 100)
        );
        
        // top left corner
        if (!$cMin && !$rMin && $chk($c-1, $r) && $chk($c-1, $r-1) && $chk($c, $r-1)) {
          $output .= $use(
            'd',
            (($c * 100) - 60),
            (($r * 100) - 60)
          );
        } else if (!$cMin && !$rMin && $chk($c-1, $r) && $chk($c-1, $r-1)) {
          $output .= $use(
            'p',
            (($c * 100) - 60),
            (($r * 100) - 60)
          );
        } else if (!$cMin && !$rMin && $chk($c, $r-1) && $chk($c-1, $r-1)) {
          $output .= $use(
            'p',
            (($c * 100) - 60),
            (($r * 100) - 60)
          );
        } else if (!$rMin && $chk($c, $r-1)) {
          $output .= $use(
            'r',
            (($c * 100) - 30),
            (($r * 100) - 30)
          );
        } else if (!$cMin && $chk($c-1, $r)) {
          $output .= $use(
            't',
            (($c * 100) - 30),
            (($r * 100) - 30)
          );
        }
        
        // bottom right corner
        if (!$cMax && !$rMax && $chk($c+1, $r) && $chk($c+1, $r+1) && $chk($c, $r+1)) {
          // already done
        } else if (!$cMax && !$rMax && $chk($c+1, $r) && $chk($c+1, $r+1)) {
          $output .= $use(
            'p',
            ((($c+1) * 100) - 60),
            ((($r+1) * 100) - 60)
          );
        } else if (!$cMax && !$rMax && $chk($c, $r+1) && $chk($c+1, $r+1)) {
          $output .= $use(
            'p',
            ((($c+1) * 100) - 60),
            ((($r+1) * 100) - 60)
          );
        } else if (!$rMax && $chk($c, $r+1)) {
          $output .= $use(
            'l',
            ((($c+1) * 100) - 60),
            ((($r+1) * 100) - 30)
          );
        } else if (!$cMax && $chk($c+1, $r)) {
          $output .= $use(
            'b',
            ((($c+1) * 100) - 30),
            ((($r+1) * 100) - 60)
          );
        }
        
        // top right corner
        if (!$cMax && !$rMin && $chk($c+1, $r) && $chk($c+1, $r-1) && $chk($c, $r-1)) {
          // already done
        } else if (!$cMax && !$rMin && $chk($c+1, $r) && $chk($c+1, $r-1)) {
          $output .= $use(
            'p',
            ((($c+1) * 100) - 60),
            (($r * 100) - 60)
          );
        } else if (!$cMax && !$rMin && $chk($c, $r-1) && $chk($c+1, $r-1)) {
          $output .= $use(
            'p',
            ((($c+1) * 100) - 60),
            (($r * 100) - 60)
          );
        }
			}
		}
    
    $output .= '
</svg>
';

		return $output;
	}
  
  function openSvg()
  {
    return '<svg version="1.1" viewBox="0 0 ' . ($this->moduleCount * 100) . ' ' . ($this->moduleCount * 100) . '" xmlns="http://www.w3.org/2000/svg" width="' . ($this->moduleCount * 10) . '"  height="' . ($this->moduleCount * 10) . '">';
  }
  
  function symbolWithPath($id, $width, $height, $path, $fill=null)
  {
    return $this->symbolWithPaths($id, $width, $height, [$path], $fill);
  }
  
  function symbolWithPaths($id, $width, $height, $paths, $fill=null)
  {
    $fillOutput = $fill === null ? '' : " fill=\"$fill\"";
    
    $output = "<symbol id=\"$id\" width=\"$width\" height=\"$height\"$fillOutput>";
    foreach ($paths as $path) {
      $output .= "<path d=\"$path\" />";
    }
    $output .= "</symbol>\n";
    
    return $output;
  }
  protected function setModuleValues():void
  {
		// do nothing - abstract class requires this
	}

}

$url = 'https://github.com/chillerlan/php-qrcode/issues/127';

$options = new QROptions([
  'eccLevel'     => QRCode::ECC_L,
  'addQuietzone' => true,
]);

$qrOutputInterface = new RoundedCornerSVGQRCodeOutput($options, (new QRCode($options))->getMatrix($url));

header('content-type: image/svg+xml');
print($qrOutputInterface->dump());