Golang : Generate Code128 barcode
Generating Code 128 barcode in Golang can be done easily with this package ( https://github.com/boombuler/barcode ). We will just adapt the code from the previous tutorial on how to generate Codabar to generating code 128 barcode.
Here you go:
package main
import (
"fmt"
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/code128"
"github.com/disintegration/imaging"
"github.com/llgcode/draw2d"
"image"
"image/color"
"image/draw"
"os"
)
func main() {
code := "socketloop.com"
fmt.Println("Generating code128 barcode for : ", code)
bcode, err := code128.Encode(code)
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("Code128 scaling error!")
os.Exit(1)
}
// now we want to append the code at the bottom
// of the Codabar
// 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("./code128.png", newImg)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// everything ok
fmt.Println("Code128 code generated and saved to code128.png")
}
Sample output :
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 :
See also : Golang : Generate Codabar
By Adam Ng
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