angular-qrcode.js
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/*
* angular-qrcode v6.2.1
* (c) 2013 Monospaced http://monospaced.com
* License: MIT
*/
angular.module('monospaced.qrcode', [])
.directive('qrcode', ['$window', function($window) {
var canvas2D = !!$window.CanvasRenderingContext2D,
levels = {
'L': 'Low',
'M': 'Medium',
'Q': 'Quartile',
'H': 'High'
},
draw = function(context, qr, modules, tile) {
for (var row = 0; row < modules; row++) {
for (var col = 0; col < modules; col++) {
var w = (Math.ceil((col + 1) * tile) - Math.floor(col * tile)),
h = (Math.ceil((row + 1) * tile) - Math.floor(row * tile));
context.fillStyle = qr.isDark(row, col) ? '#000' : '#fff';
context.fillRect(Math.round(col * tile),
Math.round(row * tile), w, h);
}
}
};
return {
restrict: 'E',
template: '<canvas class="qrcode"></canvas>',
link: function(scope, element, attrs) {
var domElement = element[0],
$canvas = element.find('canvas'),
canvas = $canvas[0],
context = canvas2D ? canvas.getContext('2d') : null,
download = 'download' in attrs,
href = attrs.href,
link = download || href ? document.createElement('a') : '',
trim = /^\s+|\s+$/g,
error,
version,
errorCorrectionLevel,
data,
size,
modules,
tile,
qr,
$img,
setVersion = function(value) {
version = Math.max(1, Math.min(parseInt(value, 10), 40)) || 5;
},
setErrorCorrectionLevel = function(value) {
errorCorrectionLevel = value in levels ? value : 'M';
},
setData = function(value) {
if (!value) {
return;
}
data = value.replace(trim, '');
qr = qrcode(version, errorCorrectionLevel);
qr.addData(data);
try {
qr.make();
} catch(e) {
error = e.message;
return;
}
error = false;
modules = qr.getModuleCount();
},
setSize = function(value) {
size = parseInt(value, 10) || modules * 2;
tile = size / modules;
canvas.width = canvas.height = size;
},
render = function() {
if (!qr) {
return;
}
if (error) {
if (link) {
link.removeAttribute('download');
link.title = '';
link.href = '#_';
}
if (!canvas2D) {
domElement.innerHTML = '<img src width="' + size + '"' +
'height="' + size + '"' +
'class="qrcode">';
}
scope.$emit('qrcode:error', error);
return;
}
if (download) {
domElement.download = 'qrcode.png';
domElement.title = 'Download QR code';
}
if (canvas2D) {
draw(context, qr, modules, tile);
if (download) {
domElement.href = canvas.toDataURL('image/png');
return;
}
} else {
domElement.innerHTML = qr.createImgTag(tile, 0);
$img = element.find('img');
$img.addClass('qrcode');
if (download) {
domElement.href = $img[0].src;
return;
}
}
if (href) {
domElement.href = href;
}
};
if (link) {
link.className = 'qrcode-link';
$canvas.wrap(link);
domElement = domElement.firstChild;
}
setVersion(attrs.version);
setErrorCorrectionLevel(attrs.errorCorrectionLevel);
setSize(attrs.size);
attrs.$observe('version', function(value) {
if (!value) {
return;
}
setVersion(value);
setData(data);
setSize(size);
render();
});
attrs.$observe('errorCorrectionLevel', function(value) {
if (!value) {
return;
}
setErrorCorrectionLevel(value);
setData(data);
setSize(size);
render();
});
attrs.$observe('data', function(value) {
if (!value) {
return;
}
setData(value);
setSize(size);
render();
});
attrs.$observe('size', function(value) {
if (!value) {
return;
}
setSize(value);
render();
});
attrs.$observe('href', function(value) {
if (!value) {
return;
}
href = value;
render();
});
}
};
}]);