mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-27 03:57:21 +00:00
75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
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/*\
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title: $:/plugins/tiddlywiki/qrcode/makeqr.js
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type: application/javascript
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module-type: macro
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Macro to convert a string into a QR Code
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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/*
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Information about this macro
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*/
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var qrcode = require("$:/plugins/tiddlywiki/qrcode/qrcode.js");
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var QRCODE_GENERATION_ERROR_PREFIX = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300"><text x="0" y="30" fill="red" font-family="Helvetica, sans-serif" font-size="18">',
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QRCODE_GENERATION_ERROR_SUFFIX = '</text></svg>';
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exports.name = "makeqr";
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exports.params = [
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{name: "text"},
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{name: "size"},
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{name: "errorCorrectLevel"},
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{name: "fallback"}
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];
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/*
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Run the macro
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*/
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exports.run = function(text,size,errorCorrectLevel,fallback) {
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var result;
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try {
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result = generateQrCode(text,{size: size, errorCorrectLevel: errorCorrectLevel});
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} catch (ex) {
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console.log("makeqr error: " + ex);
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result = fallback || ("data:image/svg+xml," + encodeURI(QRCODE_GENERATION_ERROR_PREFIX + ex + QRCODE_GENERATION_ERROR_SUFFIX));
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}
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return result || "";
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};
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function generateQrCode(text,options) {
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options = options || {};
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var typeNumber = options.typeNumber || 4,
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errorCorrectLevel = options.errorCorrectLevel || "M",
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size = options.size || 500,
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qr;
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try {
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qr = qrcode(typeNumber,errorCorrectLevel);
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qr.addData(text);
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qr.make();
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} catch (e) {
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if(typeNumber >= 40) {
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throw new Error("Text too long to encode");
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} else {
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return generateQrCode(text, {
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size: size,
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errorCorrectLevel: errorCorrectLevel,
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typeNumber: typeNumber + 1
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});
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}
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}
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var cellsize = parseInt(size / qr.getModuleCount()),
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margin = parseInt((size - qr.getModuleCount() * cellsize) / 2);
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return qr.createImgTag(cellsize, margin, size);
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}
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})();
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