mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-09 03:19:56 +00:00
75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
|
/*\
|
||
|
|
title: $:/plugins/tiddlywiki/qrcode/makeqr.js
|
||
|
|
type: application/javascript
|
||
|
|
module-type: macro
|
||
|
|
|
||
|
|
Macro to convert a string into a QR Code
|
||
|
|
|
||
|
|
\*/
|
||
|
|
(function(){
|
||
|
|
|
||
|
|
/*jslint node: true, browser: true */
|
||
|
|
/*global $tw: false */
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
/*
|
||
|
|
Information about this macro
|
||
|
|
*/
|
||
|
|
|
||
|
|
var qrcode = require("$:/plugins/tiddlywiki/qrcode/qrcode.js");
|
||
|
|
|
||
|
|
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">',
|
||
|
|
QRCODE_GENERATION_ERROR_SUFFIX = '</text></svg>';
|
||
|
|
|
||
|
|
exports.name = "makeqr";
|
||
|
|
|
||
|
|
exports.params = [
|
||
|
|
{name: "text"},
|
||
|
|
{name: "size"},
|
||
|
|
{name: "errorCorrectLevel"},
|
||
|
|
{name: "fallback"}
|
||
|
|
];
|
||
|
|
|
||
|
|
/*
|
||
|
|
Run the macro
|
||
|
|
*/
|
||
|
|
exports.run = function(text,size,errorCorrectLevel,fallback) {
|
||
|
|
var result;
|
||
|
|
try {
|
||
|
|
result = generateQrCode(text,{size: size, errorCorrectLevel: errorCorrectLevel});
|
||
|
|
} catch (ex) {
|
||
|
|
console.log("makeqr error: " + ex);
|
||
|
|
result = fallback || ("data:image/svg+xml," + encodeURI(QRCODE_GENERATION_ERROR_PREFIX + ex + QRCODE_GENERATION_ERROR_SUFFIX));
|
||
|
|
}
|
||
|
|
return result || "";
|
||
|
|
};
|
||
|
|
|
||
|
|
function generateQrCode(text,options) {
|
||
|
|
options = options || {};
|
||
|
|
var typeNumber = options.typeNumber || 4,
|
||
|
|
errorCorrectLevel = options.errorCorrectLevel || "M",
|
||
|
|
size = options.size || 500,
|
||
|
|
qr;
|
||
|
|
try {
|
||
|
|
qr = qrcode(typeNumber,errorCorrectLevel);
|
||
|
|
qr.addData(text);
|
||
|
|
qr.make();
|
||
|
|
} catch (e) {
|
||
|
|
if(typeNumber >= 40) {
|
||
|
|
throw new Error("Text too long to encode");
|
||
|
|
} else {
|
||
|
|
return generateQrCode(text, {
|
||
|
|
size: size,
|
||
|
|
errorCorrectLevel: errorCorrectLevel,
|
||
|
|
typeNumber: typeNumber + 1
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
var cellsize = parseInt(size / qr.getModuleCount()),
|
||
|
|
margin = parseInt((size - qr.getModuleCount() * cellsize) / 2);
|
||
|
|
return qr.createImgTag(cellsize, margin, size);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
})();
|