Set correct fill opacity on SVG

idist-hn · Jan 21, 2018 · 1555853 · 1555853
1 parent 11de346
commit 1555853
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/src/Writer/SvgWriter.php b/src/Writer/SvgWriter.php
@@ -34,6 +34,7 @@ public function writeString(QrCodeInterface $qrCode): string
         $blockDefinition->addAttribute('width', $data['block_size']);
         $blockDefinition->addAttribute('height', $data['block_size']);
         $blockDefinition->addAttribute('fill', '#'.sprintf('%02x%02x%02x', $qrCode->getForegroundColor()['r'], $qrCode->getForegroundColor()['g'], $qrCode->getForegroundColor()['b']));
+        $blockDefinition->addAttribute('fill-opacity', $this->getOpacity($qrCode->getForegroundColor()['a']));
 
         // Background
         $background = $svg->addChild('rect');
@@ -42,6 +43,7 @@ public function writeString(QrCodeInterface $qrCode): string
         $background->addAttribute('width', $data['outer_width']);
         $background->addAttribute('height', $data['outer_height']);
         $background->addAttribute('fill', '#'.sprintf('%02x%02x%02x', $qrCode->getBackgroundColor()['r'], $qrCode->getBackgroundColor()['g'], $qrCode->getBackgroundColor()['b']));
+        $background->addAttribute('fill-opacity', $this->getOpacity($qrCode->getBackgroundColor()['a']));
 
         foreach ($data['matrix'] as $row => $values) {
             foreach ($values as $column => $value) {
@@ -57,6 +59,13 @@ public function writeString(QrCodeInterface $qrCode): string
         return $svg->asXML();
     }
 
+    private function getOpacity(int $alpha): float
+    {
+        $opacity = 1 - $alpha / 127;
+
+        return $opacity;
+    }
+
     public static function getContentType(): string
     {
         return 'image/svg+xml';