An opinionated port of https://github.com/nayuki/QR-Code-generator to Scala.
Targets the JVM, JS and Native.
Print QR Code to the standard output:
//> using scala 3.3.4
//> using dep eu.joaocosta::qrgen::0.1.0
import eu.joaocosta.qrgen.*
val qrCode = QrCode.encodeText("https://www.scala-lang.org/", Ecc.LOW)
qrCode.foreach { line =>
println(line.map(x => if (x) "\u2588" else " ").mkString)
}Store QR Code as a BMP:
//> using scala 3.3.4
//> using dep eu.joaocosta::qrgen::0.1.0
//> using dep eu.joaocosta::minart::0.6.2
import eu.joaocosta.minart.backend.defaults.given
import eu.joaocosta.minart.graphics.*
import eu.joaocosta.minart.graphics.image.Image
import eu.joaocosta.minart.runtime.Resource
import eu.joaocosta.qrgen.*
val qrCode = QrCode.encodeText("https://www.scala-lang.org/", Ecc.LOW)
val surface = RamSurface(
qrCode.map(_.map(set => Color.grayscale(if (set) 0 else 255)))
)
Image.storeBmpImage(surface.view.scale(4), Resource("qrcode.bmp"))The code here was heavily based on nayuki/QR-Code-generator/java, with a few differences, some of which include:
- Splitting the code in smaller, self contained classes
- Favor immutability (there's still some internal mutability, though)
- Remove
QrSegmentAdvanced - Use
Stringinstead ofCharSequence - Make QR Codes extend
IndexedSeq[IndexedSeq[Boolean]]
This can have some performance impact, so the original version might be faster.