69 lines
No EOL
2.6 KiB
JavaScript
69 lines
No EOL
2.6 KiB
JavaScript
(function (ninja) {
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var qrC = ninja.qrCode = {
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// determine which type number is big enough for the input text length
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getTypeNumber: function (text) {
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var lengthCalculation = text.length * 8 + 12; // length as calculated by the QRCode
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if (lengthCalculation < 72) { return 1; }
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else if (lengthCalculation < 128) { return 2; }
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else if (lengthCalculation < 208) { return 3; }
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else if (lengthCalculation < 288) { return 4; }
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else if (lengthCalculation < 368) { return 5; }
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else if (lengthCalculation < 480) { return 6; }
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else if (lengthCalculation < 528) { return 7; }
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else if (lengthCalculation < 688) { return 8; }
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else if (lengthCalculation < 800) { return 9; }
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else if (lengthCalculation < 976) { return 10; }
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return null;
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},
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createCanvas: function (text, sizeMultiplier) {
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sizeMultiplier = (sizeMultiplier == undefined) ? 2 : sizeMultiplier; // default 2
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// create the qrcode itself
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var typeNumber = qrC.getTypeNumber(text);
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var qrcode = new QRCode(typeNumber, QRCode.ErrorCorrectLevel.H);
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qrcode.addData(text);
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qrcode.make();
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var width = qrcode.getModuleCount() * sizeMultiplier;
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var height = qrcode.getModuleCount() * sizeMultiplier;
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// create canvas element
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var canvas = document.createElement('canvas');
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var scale = 10.0;
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canvas.width = width * scale;
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canvas.height = height * scale;
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canvas.style.width = width + 'px';
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canvas.style.height = height + 'px';
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var ctx = canvas.getContext('2d');
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ctx.scale(scale, scale);
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// compute tileW/tileH based on width/height
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var tileW = width / qrcode.getModuleCount();
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var tileH = height / qrcode.getModuleCount();
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// draw in the canvas
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for (var row = 0; row < qrcode.getModuleCount() ; row++) {
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for (var col = 0; col < qrcode.getModuleCount() ; col++) {
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ctx.fillStyle = qrcode.isDark(row, col) ? "#000000" : "#ffffff";
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ctx.fillRect(col * tileW, row * tileH, tileW, tileH);
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}
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}
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// return just built canvas
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return canvas;
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},
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// show QRCodes with canvas
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// parameter: keyValuePair
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// example: { "id1": "string1", "id2": "string2"}
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// "id1" is the id of a div element where you want a QRCode inserted.
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// "string1" is the string you want encoded into the QRCode.
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showQrCode: function (keyValuePair, sizeMultiplier) {
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for (var key in keyValuePair) {
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var value = keyValuePair[key];
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try {
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if (document.getElementById(key)) {
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document.getElementById(key).innerHTML = "";
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document.getElementById(key).appendChild(qrC.createCanvas(value, sizeMultiplier));
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}
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}
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catch (e) { }
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}
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}
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};
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})(ninja); |