TinyGo with QR Code

tinygo-qrcode.go

package main

import (
	"image/color"
	"time"

	"github.com/boombuler/barcode"
	"github.com/boombuler/barcode/qr"
	"tinygo.org/x/tinyfont"
	"tinygo.org/x/tinyfont/freemono"
)

var (
	black = color.RGBA{0, 0, 0, 255}
	white = color.RGBA{255, 255, 255, 255}
)

func main() {
  // display : tinygo.org/x/drivers/ili9341.Device
	display.FillScreen(white)

	url := `https://tinygo.org/`
	qc, _ := qr.Encode(url, qr.M, qr.Auto)
	qc, _ = barcode.Scale(qc, 150, 150)

	for y := 0; y < qc.Bounds().Max.Y; y++ {
		for x := 0; x < qc.Bounds().Max.X; x++ {
			r, g, b, a := qc.At(x, y).RGBA()
			display.SetPixel(int16(x)+1, int16(y)+1, color.RGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: uint8(a)})
		}
	}
	tinyfont.WriteLine(display, &freemono.Regular9pt7b, 0, int16(qc.Bounds().Max.X)+20, url, black)

	for {
		time.Sleep(500 * time.Millisecond)
	}
}