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README.md

canvas-qr

Build Status

qrcode creator based on node-canvas and qr-js

important: install Cairo first

install Cairo first, For system-specific installation view the Wiki from node-canvas

features

  • return canvas object, use buffer or stream is your choice
  • 5 layers at most: base background, background color, background image, qrcode, logo image

install

npm i canvas-qr

use

var 
assert = require('assert')
,cq = require('canvas-qr')
,qr = cq.qr
,fs = require('fs')
,co = require('co')
,Canvas = cq.Canvas
,Image = Canvas.Image

function* t1() {

    var bgImageFile = fs.readFileSync('test/bg.jpg')
    var bgImage = new Image()
    var logoImageFile = fs.readFileSync('test/q-logo.png')
    var logoImage = new Image()

    var cvs

    bgImage.src = bgImageFile
    logoImage.src = logoImageFile

    cvs = qr({
        baseColor: '#fff' //canvas base color, all other images draw on this base
        ,backgroundImage: bgImage //canvas Image Object as background
        ,backgroundColor: null //background color String, such as 'rgba(255,255,255,.6)' or '#fff'
        ,size: 200 //image size, pix
        ,border: 0.04 // border widrth = size * border
        ,str: 'hello world' //string to encode to qr, must have this, all other params is optional
        ,forgroundColor: '#000' //forgroundColor String
        ,logoImage: logoImage //canvas Image Object as logo
        ,logoWidth: 40
        ,logoHeight: 40
        ,ecc: 'M' //ecc level, [ 'L', 'M', 'Q', 'H' ]
    })

    return new Promise(function(resolve, reject) {
        cvs.toBuffer(function(err, buf) {
            if(err) reject(err)
            else resolve buf
        })
    })

}

//for koa, use stream
app.get('/qr-image', function* (next) {

    var bgImageFile = fs.readFileSync('test/bg.jpg')
    var bgImage = new Image()
    var logoImageFile = fs.readFileSync('test/q-logo.png')
    var logoImage = new Image()

    bgImage.src = bgImageFile
    logoImage.src = logoImageFile

    var png = yield t1()
    this.type = '.png'
    this.body =png

})


//for express, use pngData
app.get('/qr-image', function* (req, res) {

    co(t1())
    .then(function(buf) {
        res.end(buf)
    })

})

changelog

  • 0.2.0 use canvas 1.3.15
  • 0.1.3 use canvas 1.2.9 compatible with node v4
  • 0.1.1 change licence to MIT, fix readme dependency
  • 0.0.4 set default ecc level = 'M'
  • 0.0.3 just change readme, nothing else

LICENSE

MIT

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qrcode creator based on node-canvas and qr.js

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