@tybys/qrcodegen
v1.0.3
Published
WebAssembly version of [nayuki/QR-Code-generator](https://github.com/nayuki/QR-Code-generator).
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Readme
qrcodegen
WebAssembly version of nayuki/QR-Code-generator.
Build with wasi-sdk for small size instead of Emscripten.
Support browser and WeChat mini program.
Usage
npm install @tybys/qrcodegenHTML script tag
<!DOCTYPE html>
<html>
<head>
<title>qrcodegen</title>
</head>
<body>
<canvas width="200" height="200" id="canvas"></canvas>
<script src="https://cdn.jsdelivr.net/npm/@tybys/qrcodegen/dist/qrcodegen.min.js"></script>
<script>
/// <reference path="./node_modules/@tybys/qrcodegen/dist/qrcodegen.d.ts" />
qrcodegen.init().then(function (api) {
var matrix = api.encodeText('Hello world!', qrcodegen.Ecc.LOW);
/** @type {HTMLCanvasElement} */
var canvas = document.getElementById('canvas');
qrcodegen.drawCanvas(canvas, matrix, {
// foregroundColor: '#000000',
// backgroundColor: '#ffffff',
// padding: 0
});
});
</script>
</body>
</html>Webpack
import { init, drawCanvas, Ecc } from '@tybys/qrcodegen'
init().then(function (api) {
var matrix = api.encodeText('Hello world!', Ecc.LOW)
/** @type {HTMLCanvasElement} */
var canvas = document.getElementById('canvas')
drawCanvas(canvas, matrix, {
// foregroundColor: '#000000',
// backgroundColor: '#ffffff',
// padding: 0
})
})WeChat mini program
<canvas type="2d" id="canvas" style="width: 750rpx; height: 750rpx"></canvas>const { init, drawCanvas, Ecc } = require('@tybys/qrcodegen')
const dpr = wx.getSystemInfoSync().pixelRatio
const scale = wx.getSystemInfoSync().screenWidth / 375
function getCanvas (id) {
return new Promise(resolve => {
const query = wx.createSelectorQuery()
query.select(id)
.fields({ node: true, size: true })
.exec((res) => {
resolve(res[0].node)
})
})
}
Page({
onReady () {
Promise.all([
getCanvas('#canvas'),
init()
]).then(([canvas, api]) => {
canvas.width = 375 * scale * dpr
canvas.height = 375 * scale * dpr
const matrix = api.encodeText('Hello world!', Ecc.LOW)
drawCanvas(canvas, matrix, {
// foregroundColor: '#000000',
// backgroundColor: '#ffffff',
// padding: 0
})
})
}
})Building
Install wasi-sdk ($WASI_SDK_PATH) and
binaryen
npm install --ignore-scripts
npm run build:wasm
npm run build