Refactors. Adds blank option.

pull/2/head
Lars Jung 12 years ago
parent 830be03164
commit 67bb921019

@ -10,6 +10,12 @@ Uses [QR Code Generator](http://www.d-project.com/qrcode/index.html) (MIT). Kudo
## Changelog ## Changelog
### develop branch
* ...
### v0.5.0 - *2013-07-23* ### v0.5.0 - *2013-07-23*
* adds option to set error correction level * adds option to set error correction level

@ -6,35 +6,45 @@
(function ($) { (function ($) {
'use strict'; 'use strict';
// Check if canvas is available in the browser (as Modernizr does)
var canvasAvailable = (function () {
var elem = document.createElement('canvas');
return !!(elem.getContext && elem.getContext('2d'));
}()),
// Wrapper for the original QR code generator. // Wrapper for the original QR code generator.
createQr = function (version, level, text) { var QRCode = function (version, level, text) {
try {
// `qrcode` is the single public function that will be defined by the `QR Code Generator` // `qrcode` is the single public function that will be defined by the `QR Code Generator`
// at the end of the file. // at the end of the file.
var qr = qrcode(version, level); var qr = qrcode(version, level);
qr.addData(text); qr.addData(text);
qr.make(); qr.make();
return qr; 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)
canvasAvailable = (function () {
var elem = document.createElement('canvas');
return !!(elem.getContext && elem.getContext('2d'));
}()),
// Returns a minimal QR code for the given text starting with version `minVersion`. // 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`. // Returns `null` if `text` is too long to be encoded in `maxVersion`.
createBestQr = function (minVersion, maxVersion, level, text) { createBestQr = function (minVersion, maxVersion, level, text) {
minVersion = Math.max(1, minVersion); minVersion = Math.max(1, minVersion);
maxVersion = Math.min(40, maxVersion); maxVersion = Math.min(40, maxVersion);
for (var type = minVersion; type <= maxVersion; type += 1) { for (var version = minVersion; version <= maxVersion; version += 1) {
try { var qr = new QRCode(version, level, text);
return createQr(type, level, text); if (qr) {
} catch (err) {} return qr;
}
} }
return null; return null;
@ -50,6 +60,7 @@
settings_height = settings.height, settings_height = settings.height,
settings_color = settings.color, settings_color = settings.color,
settings_bgColor = settings.bgColor, settings_bgColor = settings.bgColor,
settings_blank = settings.blank,
qr = createBestQr(settings.minVersion, settings.maxVersion, settings.ecLevel, settings.text), qr = createBestQr(settings.minVersion, settings.maxVersion, settings.ecLevel, settings.text),
$canvas = $(canvas), $canvas = $(canvas),
@ -61,15 +72,30 @@
} }
if (qr) { if (qr) {
var moduleCount = qr.getModuleCount(), $canvas.data('qrcode', qr);
var moduleCount = qr.moduleCount,
moduleWidth = settings_width / moduleCount, moduleWidth = settings_width / moduleCount,
moduleHeight = settings_height / 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(); ctx.beginPath();
for (row = 0; row < moduleCount; row += 1) { for (row = 0; row < moduleCount; row += 1) {
for (col = 0; col < moduleCount; col += 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); ctx.rect(settings_left + col * moduleWidth, settings_top + row * moduleHeight, moduleWidth, moduleHeight);
} }
} }
@ -115,7 +141,9 @@
} }
if (qr) { if (qr) {
var moduleCount = qr.getModuleCount(), $div.data('qrcode', qr);
var moduleCount = qr.moduleCount,
moduleWidth = math_floor(settings_width / moduleCount), moduleWidth = math_floor(settings_width / moduleCount),
moduleHeight = math_floor(settings_height / moduleCount), moduleHeight = math_floor(settings_height / moduleCount),
offsetLeft = math_floor(0.5 * (settings_width - moduleWidth * moduleCount)), offsetLeft = math_floor(0.5 * (settings_width - moduleWidth * moduleCount)),
@ -186,7 +214,10 @@
bgColor: null, bgColor: null,
// the encoded text // the encoded text
text: 'no text' text: 'no text',
// blank space: {l, t, r, b}
blank: null
}; };
// Register the plugin // Register the plugin

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