How to add a simple text label to an image in Go?

Question

Given image.RGBA, coordinates, and a line of text, how do I add a simple label with any plain fixed font? E.g. Face7x13 from font/basicfont.

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Answer 1

here is the sample code using gg library where we already have src.jpg or any image and we write text over it.. you can adjust canvas size accordingly .. it's just example. let me know if it doesn't work.

package main

import (
    "github.com/fogleman/gg"
    "log"
)

func main() {
    const S = 1024
    im, err := gg.LoadImage("src.jpg")
    if err != nil {
        log.Fatal(err)
    }

    dc := gg.NewContext(S, S)
    dc.SetRGB(1, 1, 1)
    dc.Clear()
    dc.SetRGB(0, 0, 0)
    if err := dc.LoadFontFace("/Library/Fonts/Arial.ttf", 96); err != nil {
        panic(err)
    }
    dc.DrawStringAnchored("Hello, world!", S/2, S/2, 0.5, 0.5)

    dc.DrawRoundedRectangle(0, 0, 512, 512, 0)
    dc.DrawImage(im, 0, 0)
    dc.DrawStringAnchored("Hello, world!", S/2, S/2, 0.5, 0.5)
    dc.Clip()
    dc.SavePNG("out.png")
}