@p107/qr-code-styling

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