simpleprint/main.go at main · Codaea/simpleprint · GitHub

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package main

import (
	"fmt"
	"image"
	"image/color"
	"os"

	"github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
	"github.com/joho/godotenv"
	"github.com/makeworld-the-better-one/dither/v2"
	"github.com/mect/go-escpos"
)

func main() {

	_ = godotenv.Overload(".env")

	// printer setup
	printerPath, found := os.LookupEnv("PRINTER_PATH")
	if !found {
		printerPath = ""
	}
	p, err := escpos.NewUSBPrinterByPath(printerPath)
	if err != nil {
		fmt.Println("No Printa Found!!")
		fmt.Println("Failed to connect to printer:", err)
		return
	}
	p.Init()
	p.Smooth(true)

	if os.Getenv("GIN_MODE") == "release" {
		gin.SetMode(gin.ReleaseMode)
	}
	router := gin.Default()
	router.Use(cors.Default())
	router.Use(func(c *gin.Context) {
		c.Set("printer", p)
		c.Next()
	})

	router.POST("/print", handlePrint)

	fmt.Printf("Listening and serving on 0.0.0.0:%s\n", os.Getenv("PORT"))
	router.Run() // listen and serve on 0.0.0.0:8080 (or whatever is set as PORT environment variable)
}

func processImage(i Image) image.Image {

	palette := []color.Color{
		color.Black, color.White,
	}
	d := dither.NewDitherer(palette)

	// Apply dither mode if specified
	switch i.DitherMode {
	case "floydsteinberg":
		d.Matrix = dither.FloydSteinberg
		return d.Dither(i.img)
	case "atkinson":
		d.Matrix = dither.Atkinson
		return d.Dither(i.img)
	case "clustereddot8x8":
		d.Mapper = dither.PixelMapperFromMatrix(dither.ClusteredDot8x8, 0.5)
		return d.Dither(i.img)
	case "clustereddot4x4":
		d.Mapper = dither.PixelMapperFromMatrix(dither.ClusteredDot4x4, 0.5)
		return d.Dither(i.img)
	case "clustereddot6x6":
		d.Mapper = dither.PixelMapperFromMatrix(dither.ClusteredDot6x6, 0.5)
		return d.Dither(i.img)
	case "burkes":
		d.Matrix = dither.Burkes
		return d.Dither(i.img)
	case "jarvisjudiceninke":
		d.Matrix = dither.JarvisJudiceNinke
		return d.Dither(i.img)
	case "sierra":
		d.Matrix = dither.Sierra
		return d.Dither(i.img)
	case "sierralite":
		d.Matrix = dither.SierraLite
		return d.Dither(i.img)
	case "stucki":
		d.Matrix = dither.Stucki
		return d.Dither(i.img)
	case "stevenpigeon":
		d.Matrix = dither.StevenPigeon
		return d.Dither(i.img)
	case "simple2d":
		d.Matrix = dither.Simple2D
		return d.Dither(i.img)
	case "tworowsierra":
		d.Matrix = dither.TwoRowSierra
		return d.Dither(i.img)
	case "falsefloydsteinberg":
		d.Matrix = dither.FalseFloydSteinberg
		return d.Dither(i.img)
	case "none":
		return i.img
	default:
		return i.img
	}

}

/*
Let's define a JSON schema for what we need

{
	"receipt": [
		{
			"type": "line",
			"content": "Hello World",
			"font-size": 2,
			"font": "A",
			"alignment": "center",
			"underline": false
		},
		{
			"type": "feed",
			"lines": 2
		},
		{
			"type": "barcode",
			"code": "123456789012",
			"barcode-type": "CODE128"
		},
		{
			"type": "qr",
			"code": "https://example.com",
			"size": 8
		},
		{
			"type": "image",
			"data": "data:image/png;base64,iVBORw0KGgoAAAANSU...",
			"alignment": "center",
			"dither-mode": "floydsteinberg"
		},
		{
			"type": "text",
			"content": "Multi-line text\nwith newlines",
			"font-size": 1,
			"font": "A",
			"alignment": "left",
			"underline": false
		}
	]
}
*/