blackhole-qr v2.0.5

blackhole-qr

blackhole-qr allows you to store large amounts of characters or JSON objects in a QR code. using (CBOR, PAKO, HEX). compresses up to 96% of the size.

• CBOR ( for generate an Uint8Array)
• PAKO ( for compress Uint8Array, very fast )
• QRIOUS ( high quality QR library )
• HEX (Buffer.from(_).toString('hex' )

Features

• INPUT 30.811 Length
• OUTPUT 1856 Length
• RESULT -> 93.98 % Less
• It takes a value and converts it to QR.
• The Qr is generated in a canva.
• Allows to compress large amounts of characters and reduce their size by 80-90%

Usage

npm i blackhole-qr

1. Create an canvas

 <canvas id="qr"></canvas>

2. Import module

import { Blackhole }from 'blackhole-qr'

3. Class instance (canvas, value, qr_size)

     const QR = new Blackhole()
      QR.generate('qr', 'value_to_QR', 300)

4. Change QR parameters (optional)

     const QR = new Blackhole()
      QR.generate('qr', 'value', 300)
      QR.set.size = 500;
      QR.set.background = 'green';
      QR.set.backgroundAlpha = 0.8;
      QR.set.foreground = 'blue';
      QR.set.foregroundAlpha = 0.8;
      QR.set.level = 'L';
      QR.set.padding = 25;
      QR.set.value = 'https://github.com/neocotic/qrious';

5. Test

    generateRamdomJSON() {
      let beforeEncodeProcess = [];
      let result = "";
      let characters =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
      let charactersLength = characters.length;
      for (let i = 0; i < 1000; i++) {
        result += characters.charAt(
          Math.floor(Math.random() * charactersLength)
        );
      }

      for (let d = 0; d < 30; d++) {
        beforeEncodeProcess.push({ answer: 5, textarea: result });
      }

      console.log(JSON.stringify(beforeEncodeProcess).length);
      const QR = new Blackhole();
      QR.generate("qr", beforeEncodeProcess, 300);
      console.log(QR.cborHex.length);
    }

INPUT 30.811 Length OUTPUT 1856 Length RESULT -> 93.98 % Less

6.DECODE

     QR.decode()
     QR.decodeByValue('QR.cborHex')

7.ENCODE by value

     QR.encodeByValue('data')

License

MIT https://github.com/Kraphene