QR Code Styling

Installation

npm install @p107/qr-code-styling

Usage

import * as QRCodeStyling from "@p107/qr-code-styling";

const qrCode = new QRCodeStyling({
  width: 232,
  height: 232,
  margin: 14,
  data: "https://www.google.com/",
  image:
    "https://upload.wikimedia.org/wikipedia/commons/5/51/Facebook_f_logo_%282019%29.svg",
  dotsOptions: {
    color: "#4267b2",
    type: "rounded"
  },
  backgroundOptions: {
    color: "#e9ebee"
  },
  imageOptions: {
    crossOrigin: "anonymous",
    margin: 14
  }
});

qrCode.append(this.canvas.nativeElement);

qrCode.download({ name: "qr", extension: "svg" });

API Documentation

QRCodeStyling instance

new QRCodeStyling(options) => QRCodeStyling

Param |Type |Description -------|------|------------ options|object|Init object

options structure

Property |Type |Default Value|Description -----------------------|-------------------------|-------------|----------------------------------------------------- width |number |300 |Size of canvas height |number |300 |Size of canvas type |string ('canvas' 'svg')|canvas |The type of the element that will be rendered data |string | |The date will be encoded to the QR code image |string | |The image will be copied to the center of the QR code margin |number |0 |Margin around canvas qrOptions |object | |Options will be passed to qrcode-generator lib imageOptions |object | |Specific image options, details see below dotsOptions |object | |Dots styling options cornersSquareOptions |object | |Square in the corners styling options cornersDotOptionsHelper|object | |Dots in the corners styling options backgroundOptions |object | |QR background styling options

options.qrOptions structure

Property |Type |Default Value --------------------|--------------------------------------------------|------------- typeNumber |number (0 - 40) |0 mode |string ('Numeric' 'Alphanumeric' 'Byte' 'Kanji')| errorCorrectionLevel|string ('L' 'M' 'Q' 'H') |'Q'

options.imageOptions structure

Property |Type |Default Value|Description ------------------|---------------------------------------|-------------|------------------------------------------------------------------------------ hideBackgroundDots|boolean |true |Hide all dots covered by the image imageSize |number |0.4 |Coefficient of the image size. Not recommended to use ove 0.5. Lower is better margin |number |0 |Margin of the image in px crossOrigin |string('anonymous' 'use-credentials')| |Set "anonymous" if you want to download QR code from other origins.

options.dotsOptions structure

Property|Type |Default Value|Description --------|------------------------------------------------------------------------------|-------------|------------------- color |string |'#000' |Color of QR dots gradient|object | |Gradient of QR dots type |string ('rounded' 'dots' 'classy' 'classy-rounded' 'square' 'extra-rounded')|'square' |Style of QR dots

options.backgroundOptions structure

Property|Type |Default Value --------|------|------------- color |string|'#fff' gradient|object|

options.cornersSquareOptions structure

Property|Type |Default Value|Description --------|-----------------------------------------|-------------|----------------- color |string | |Color of Corners Square gradient|object | |Gradient of Corners Square type |string ('dot' 'square' 'extra-rounded')| |Style of Corners Square

options.cornersDotOptions structure

Property|Type |Default Value|Description --------|-------------------------|-------------|----------------- color |string | |Color of Corners Dot gradient|object | |Gradient of Corners Dot type |string ('dot' 'square')| |Style of Corners Dot

Gradient structure

options.dotsOptions.gradient

options.backgroundOptions.gradient

options.cornersSquareOptions.gradient

options.cornersDotOptions.gradient

Property |Type |Default Value|Description ----------|----------------------------|-------------|--------------------------------------------------------- type |string ('linear' 'radial')|"linear" |Type of gradient spread rotation |number |0 |Rotation of gradient in radians (Math.PI === 180 degrees) colorStops|array of objects | |Gradient colors. Example [{ offset: 0, color: 'blue' }, { offset: 1, color: 'red' }]

Gradient colorStops structure

options.dotsOptions.gradient.colorStops[]

options.backgroundOptions.gradient.colorStops[]

options.cornersSquareOptions.gradient.colorStops[]

options.cornersDotOptions.gradient.colorStops[]

Property|Type |Default Value|Description --------|----------------|-------------|----------------------------------- offset |number (0 - 1)| |Position of color in gradient range color |string | |Color of stop in gradient range

QRCodeStyling methods

QRCodeStyling.append(container) => void

Param |Type |Description ---------|-----------|----------- container|DOM element|This container will be used for appending of the QR code

QRCodeStyling.getRawData(extension) => Promise<Blob>

Param |Type |Default Value|Description ---------|------------------------------------|-------------|------------ extension|string ('png' 'jpeg' 'webp' 'svg')|'png' |Blob type

QRCodeStyling.update(options) => void

Param |Type |Description -------|------|-------------------------------------- options|object|The same options as for initialization

QRCodeStyling.applyExtension(extension) => void

Param |Type |Description ---------|----------------------|------------------------------------------------------------------------------------------ extension|(svg, options) => void|Extension is a function that takes svg and previously applied options and modifies an svg

applyExtension example

const extension = (svg, options) => {
    const { width, height } = options;
    const size = Math.min(width, height);
    const border = document.createElementNS("http://www.w3.org/2000/svg", "rect");
    const borderAttributes = {
        "fill": "none",
        "x": (width - size + 40) / 2,
        "y": (height - size + 40) / 2,
        "width": size - 40,
        "height": size - 40,
        "stroke": 'black',
        "stroke-width": 40,
        "rx": 100,
    };
    Object.keys(borderAttributes).forEach(attribute => {
      border.setAttribute(attribute, borderAttributes[attribute]);
    });
    svg.appendChild(border);
};

QRCodeStyling.deleteExtension() => void

QRCodeStyling.download(downloadOptions) => Promise<void>

Param |Type |Description ---------------|------|------------ downloadOptions|object|Options with extension and name of file (not required)

downloadOptions structure

Property |Type |Default Value|Description ---------|------------------------------------|-------------|----------------------------------------------------- name |string |'qr' |Name of the downloaded file extension|string ('png' 'jpeg' 'webp' 'svg')|'png' |File extension