From 67bb9210196175888bcf6a1667481af3f8de4f8b Mon Sep 17 00:00:00 2001
From: Lars Jung <lrsjng@gmail.com>
Date: Wed, 24 Jul 2013 22:25:19 +0200
Subject: [PATCH] Refactors. Adds blank option.

---
 README.md            |  6 ++++
 src/jquery.qrcode.js | 75 +++++++++++++++++++++++++++++++-------------
 2 files changed, 59 insertions(+), 22 deletions(-)

diff --git a/README.md b/README.md
index 7c9e266..9d41c98 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,12 @@ Uses [QR Code Generator](http://www.d-project.com/qrcode/index.html) (MIT). Kudo
 
 ## Changelog
 
+
+### develop branch
+
+* ...
+
+
 ### v0.5.0 - *2013-07-23*
 
 * adds option to set error correction level
diff --git a/src/jquery.qrcode.js b/src/jquery.qrcode.js
index 8be8f84..c3517bd 100644
--- a/src/jquery.qrcode.js
+++ b/src/jquery.qrcode.js
@@ -6,35 +6,45 @@
 (function ($) {
 	'use strict';
 
+
+		// Wrapper for the original QR code generator.
+	var QRCode = function (version, level, text) {
+
+			try {
+				// `qrcode` is the single public function that will be defined by the `QR Code Generator`
+				// at the end of the file.
+				var qr = qrcode(version, level);
+				qr.addData(text);
+				qr.make();
+
+				this.version = version;
+				this.level = level;
+				this.text = text;
+				this.moduleCount = qr.getModuleCount();
+				this.isDark = function (col, row) { return qr.isDark(col, row); };
+			} catch (err) {
+				return null;
+			}
+		},
+
 		// Check if canvas is available in the browser (as Modernizr does)
-	var canvasAvailable = (function () {
+		canvasAvailable = (function () {
 
 			var elem = document.createElement('canvas');
 			return !!(elem.getContext && elem.getContext('2d'));
 		}()),
 
-		// Wrapper for the original QR code generator.
-		createQr = function (version, level, text) {
-
-			// `qrcode` is the single public function that will be defined by the `QR Code Generator`
-			// at the end of the file.
-			var qr = qrcode(version, level);
-			qr.addData(text);
-			qr.make();
-
-			return qr;
-		},
-
 		// Returns a minimal QR code for the given text starting with version `minVersion`.
 		// Returns `null` if `text` is too long to be encoded in `maxVersion`.
 		createBestQr = function (minVersion, maxVersion, level, text) {
 
 			minVersion = Math.max(1, minVersion);
 			maxVersion = Math.min(40, maxVersion);
-			for (var type = minVersion; type <= maxVersion; type += 1) {
-				try {
-					return createQr(type, level, text);
-				} catch (err) {}
+			for (var version = minVersion; version <= maxVersion; version += 1) {
+				var qr = new QRCode(version, level, text);
+				if (qr) {
+					return qr;
+				}
 			}
 
 			return null;
@@ -50,6 +60,7 @@
 				settings_height = settings.height,
 				settings_color = settings.color,
 				settings_bgColor = settings.bgColor,
+				settings_blank = settings.blank,
 
 				qr = createBestQr(settings.minVersion, settings.maxVersion, settings.ecLevel, settings.text),
 				$canvas = $(canvas),
@@ -61,15 +72,30 @@
 			}
 
 			if (qr) {
-				var moduleCount = qr.getModuleCount(),
+				$canvas.data('qrcode', qr);
+
+				var moduleCount = qr.moduleCount,
 					moduleWidth = settings_width / moduleCount,
 					moduleHeight = settings_height / moduleCount,
-					row, col;
+					row, col,
+					forceBlank = function () { return false; };
+
+				if (settings_blank) {
+					forceBlank = function (row, col) {
+
+						var l = settings_left + col * moduleWidth,
+							t = settings_top + row * moduleHeight,
+							r = l + moduleWidth,
+							b = t + moduleHeight;
+
+						return settings_blank.l <= r && l <= settings_blank.r && settings_blank.t <= b && t <= settings_blank.b;
+					};
+				}
 
 				ctx.beginPath();
 				for (row = 0; row < moduleCount; row += 1) {
 					for (col = 0; col < moduleCount; col += 1) {
-						if (qr.isDark(row, col)) {
+						if (qr.isDark(row, col) && !forceBlank(row, col)) {
 							ctx.rect(settings_left + col * moduleWidth, settings_top + row * moduleHeight, moduleWidth, moduleHeight);
 						}
 					}
@@ -115,7 +141,9 @@
 			}
 
 			if (qr) {
-				var moduleCount = qr.getModuleCount(),
+				$div.data('qrcode', qr);
+
+				var moduleCount = qr.moduleCount,
 					moduleWidth = math_floor(settings_width / moduleCount),
 					moduleHeight = math_floor(settings_height / moduleCount),
 					offsetLeft = math_floor(0.5 * (settings_width - moduleWidth * moduleCount)),
@@ -186,7 +214,10 @@
 			bgColor: null,
 
 			// the encoded text
-			text: 'no text'
+			text: 'no text',
+
+			// blank space: {l, t, r, b}
+			blank: null
 		};
 
 	// Register the plugin