Golang : Generate Interleaved 2 inch by 5 inch barcode




For this tutorial, we will learn how to generate interleaved and standard "2 of 5" barcodes in Golang with this package ( https://godoc.org/github.com/boombuler/barcode/twooffive ).

Here you go!

 package main

 import (
 "fmt"
 "github.com/boombuler/barcode"
 "github.com/boombuler/barcode/twooffive"
 "github.com/disintegration/imaging"
 "github.com/llgcode/draw2d"
 "image"
 "image/color"
 "image/draw"
 "os"
 )

 func main() {

 code := "socketloop.com"

 fmt.Println("Generating interleaved and standard 2 inch by 5 inch barcode for : ", code)

 // create interleaved barcode, set to true
 // see https://godoc.org/github.com/boombuler/barcode/twooffive#Encode
 bcode, err := twoffive.Encode(code, true)

 if err != nil {
 fmt.Printf("String %s cannot be encoded", code)
 os.Exit(1)
 }

 // scale to 250x20
 bcode, err = barcode.Scale(bcode, 250, 20)

 if err != nil {
 fmt.Println("Two by five barcode scaling error!")
 os.Exit(1)
 }

 // now we want to append the code at the bottom
 // of the two by five barcode

 // Create an new image with text data
 // From https://github.com/llgcode/draw2d.samples/tree/master/helloworld
 // Set the global folder for searching fonts
 draw2d.SetFontFolder(".")

 // Initialize the graphic context on an RGBA image
 img := image.NewRGBA(image.Rect(0, 0, 250, 50))

 // set background to white
 white := color.RGBA{255, 255, 255, 255}
 draw.Draw(img, img.Bounds(), &image.Uniform{white}, image.ZP, draw.Src)

 gc := draw2d.NewGraphicContext(img)

 gc.FillStroke()

 // Set the font Montereymbi.ttf
 gc.SetFontData(draw2d.FontData{"Monterey", draw2d.FontFamilyMono, draw2d.FontStyleBold | draw2d.FontStyleItalic})
 // Set the fill text color to black
 gc.SetFillColor(image.Black)

 gc.SetFontSize(14)
 gc.FillStringAt(code, 50, 20)

 // create a new blank image with white background
 newImg := imaging.New(300, 300, color.NRGBA{255, 255, 255, 255})

 //paste the codabar to new blank image
 newImg = imaging.Paste(newImg, bcode, image.Pt(50, 50))

 //paste the text to the new blank image
 newImg = imaging.Paste(newImg, img, image.Pt(50, 90))

 err = draw2d.SaveToPngFile("./twoofive.png", newImg)

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 // everything ok
 fmt.Println("Two by five interleaved barcode generated and saved to twoofive.png")

 }

NOTE : For some odd reason, the luximbi.ttf font from https://github.com/llgcode/draw2d.samples/tree/master/helloworld cannot be used. Therefore, I've replaced it with the Monterey font.

You can get the Monterey font from http://www.1001freefonts.com/monterey.font , unzip the zip file and rename the MontereyFLF.ttf to Montereymbi.ttf with this command and execute the code above in the same directory as the 'Montereymbi.ttf' file.

cp MontereyFLF.ttf Montereymbi.ttf

References :

https://godoc.org/github.com/boombuler/barcode/twooffive

https://www.socketloop.com/tutorials/golang-generate-code128-barcode





By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


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