Created
August 28, 2013 10:26
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QRCode
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/** | |
* QRCode generator | |
* | |
* @author Sascha Greuel | |
* @copyright 2010-2013 Sascha Greuel | |
* @license Creative Commons BY-SA <http://creativecommons.org/licenses/by-sa/3.0/> | |
*/ | |
var qrgen = function () { | |
// Get options | |
var options = arguments[1]; | |
/** | |
* Set options | |
*/ | |
options = function () { | |
var i = 0, | |
key = ''; | |
for (i = 1; i < arguments.length; i += 1) { | |
for (key in arguments[i]) { | |
arguments[i].hasOwnProperty(key) && (arguments[0][key] = arguments[i][key]) | |
} | |
} | |
return arguments[0] | |
}({}, { | |
text: (typeof options === 'string' ? options : (typeof options === 'undefined' ? 'QR-Code-Plugin - Copyright 2013 by SoftCreatR.de' : options)), | |
width: 100, | |
height: 100, | |
background: '#ffffff', | |
foreground: '#000000' | |
}, options); | |
// create qrcode | |
var qrcode = new QRCode(-1, QRErrorCorrectLevel.M); | |
qrcode.addData(options.text.replace(/^\s+|\s+$/g, '')); | |
qrcode.make(); | |
/** | |
* Create canvas object | |
*/ | |
var createCanvas = function () { | |
var tileW = tileH = row = col = w = h = 0, | |
canvas = ctx = {}; | |
// create canvas element | |
canvas = document.createElement('canvas'); | |
canvas.width = options.width; | |
canvas.height = options.height; | |
ctx = canvas.getContext('2d'); | |
// compute tileW/tileH based on options.width/options.height | |
tileW = options.width / qrcode.getModuleCount(); | |
tileH = options.height / qrcode.getModuleCount(); | |
// draw in the canvas | |
for (row = 0; row < qrcode.getModuleCount(); row += 1) { | |
for (col = 0; col < qrcode.getModuleCount(); col += 1) { | |
ctx.fillStyle = (qrcode.isDark(row, col) ? options.foreground : options.background), w = Math.ceil((col + 1) * tileW) - Math.floor(col * tileW), h = Math.ceil((row + 1) * tileW) - Math.floor(row * tileW), ctx.fillRect(Math.round(col * tileW), Math.round(row * tileH), w, h) | |
} | |
} | |
// return built canvas | |
return canvas | |
} | |
/** | |
* Create table object | |
*/ | |
var createTable = function () { | |
var tileW = tileH = rows = cols = 0, | |
table = row = col = {}; | |
// create table element | |
table = document.createElement('table'); | |
table.style.width = options.width + 'px'; | |
table.style.height = options.height + 'px'; | |
table.style.border = '0px'; | |
table.style.borderCollapse = 'collapse'; | |
table.style.backgroundColor = options.background; | |
// compute tileW/tileH based on options.width/options.height | |
tileW = options.width / qrcode.getModuleCount(); | |
tileH = options.height / qrcode.getModuleCount(); | |
// draw in the table | |
for (rows = 0; rows < qrcode.getModuleCount(); rows += 1) { | |
for (row = document.createElement('tr'), row.style.height = tileH + 'px', table.appendChild(row), cols = 0; cols < qrcode.getModuleCount(); cols += 1) { | |
col = document.createElement('td'), col.style.width = tileW + 'px', col.style.backgroundColor = (qrcode.isDark(rows, cols) ? options.foreground : options.background), row.appendChild(col) | |
} | |
} | |
// return built table | |
return table; | |
} | |
// output qrcode based on the browsers capabilities | |
try { | |
document.createElement('canvas').getContext('2d'); | |
arguments[0].appendChild(createCanvas()); | |
} catch (e) { | |
arguments[0].appendChild(createTable()); | |
} | |
}; |
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