package rotate

import (
	"image"
	"math"
)

func Rotate(img image.Image, angle float64) image.Image {
	newImg := image.NewRGBA(img.Bounds())
	w, h := img.Bounds().Dx(), img.Bounds().Dy()
	hh, hw := float64(h/2), float64(w/2)

	for y := 0; y < w; y++ {
		for x := 0; x < h; x++ {
			newImg.Set(
				int(hh-math.Cos(angle)),
				int(hw-math.Sin(angle)),
				img.At(x, y),
			)
		}
	}
	return newImg
}