collage-maker/main.go

package main

import (
	"fmt"
	"image"
	"image/draw"
	"image/jpeg"
	"os"

	"github.com/oliamb/cutter"
	"go.oneofone.dev/resize"
)

/**
"431"
"697"
"2514"
"2047"
zoom: 0.392
816
528
-------------
"153"
"9"
"1331"
"772"
zoom: 0.6949
816
528
*/

func main() {
	const width = 816 * 4
	const height = 528 * 4
	imgFile1, err := os.Open("img1.jpg")
	if err != nil {
		fmt.Println(err)
	}
	imgFile2, err := os.Open("img2.jpg")
	if err != nil {
		fmt.Println(err)
	}
	img1, _, err := image.Decode(imgFile1)
	if err != nil {
		fmt.Println(err)
	}
	img2, _, err := image.Decode(imgFile2)
	if err != nil {
		fmt.Println(err)
	}

	img1, err = cutter.Crop(img1, cutter.Config{
		Width:  2514 - 431,
		Height: 2047 - 697,
		Anchor: image.Point{431, 697},
		Mode:   cutter.TopLeft, // optional, default value
	})

	if err != nil {
		panic(err)
	}

	img1 = resize.Resize(width, height, img1, resize.Lanczos3)

	img2, err = cutter.Crop(img2, cutter.Config{
		Width:  1331 - 153,
		Height: 772 - 9,
		Anchor: image.Point{153, 9},
		Mode:   cutter.TopLeft, // optional, default value
	})

	if err != nil {
		panic(err)
	}

	img2 = resize.Resize(width, height, img2, resize.Lanczos3)

	//starting position of the second image (bottom left)
	//sp2 := image.Point{img1.Bounds().Dx(), 0}
	//new rectangle for the second image
	//r2 := image.Rectangle{sp2, sp2.Add(img2.Bounds().Size())}
	//rectangle for the big image
	r := image.Rectangle{image.Point{0, 0}, image.Point{width, height + height}}
	r2 := image.Rectangle{image.Point{0, height + 1}, image.Point{width, height + height}}
	rgba := image.NewRGBA(r)

	draw.Draw(rgba, img1.Bounds(), img1, image.Point{0, 0}, draw.Src)
	draw.Draw(rgba, r2, img2, image.Point{0, 0}, draw.Src)

	out, err := os.Create("./output.jpg")
	if err != nil {
		fmt.Println(err)
	}

	var opt jpeg.Options
	opt.Quality = 80

	jpeg.Encode(out, rgba, &opt)
}