From b309653a391ed9eb8ef7605c5b689f650b1232d3 Mon Sep 17 00:00:00 2001
From: Michael Mason <mjmasn@gmail.com>
Date: Mon, 9 Nov 2015 17:08:24 +0000
Subject: [PATCH] (#2) Make the QR code center aligned

---
 qr.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/qr.js b/qr.js
index 4f127e6..c8a0955 100644
--- a/qr.js
+++ b/qr.js
@@ -1045,10 +1045,12 @@
       px /= width;
       px  = Math.floor(px);
 
+      var offset = Math.floor((size - (px * width)) / 2);
+
       // Draw the QR code.
       c2d.clearRect(0, 0, size, size);
       c2d.fillStyle = data.background || '#fff';
-      c2d.fillRect(0, 0, px * (width + 8), px * (width + 8));
+      c2d.fillRect(0, 0, size, size);
       c2d.fillStyle = data.foreground || '#000';
 
       var i, j;
@@ -1056,7 +1058,7 @@
       for (i = 0; i < width; i++) {
         for (j = 0; j < width; j++) {
           if (frame[j * width + i]) {
-            c2d.fillRect(px * i, px * j, px, px);
+            c2d.fillRect(px * i + offset, px * j + offset, px, px);
           }
         }
       }