Server/cmd/generate-k-image/main.go

package main

import (
	"git.aiterp.net/lucifer3/server/internal/color"
	"image"
	color2 "image/color"
	"image/png"
	"math"
	"os"
)

func main() {
	img := image.NewRGBA(image.Rect(0, 0, 1000, 1000))
	for y := 0; y < 1000; y += 1 {
		for x := 0; x < 1000; x += 1 {
			vecX := float64(x-500) / 500.0
			vecY := float64(y-500) / 500.0
			dist := math.Sqrt(vecX*vecX + vecY*vecY)
			angle := math.Mod((math.Atan2(vecY/dist, vecX/dist)*(180/math.Pi))+360+90, 360)

			if dist >= 0.9 && dist < 1 && angle > 2.5 && angle < 357.5 {
				k := 1000 + int(11000*((angle-2.5)/355))
				c := color.Color{K: &k}
				rgb, _ := c.ToRGB()
				img.Set(x, y, color2.RGBA{
					R: uint8(rgb.RGB.Red * 255.0),
					G: uint8(rgb.RGB.Green * 255.0),
					B: uint8(rgb.RGB.Blue * 255.0),
					A: 255,
				})
			} else if dist < 0.85 {
				rgb := (color.HueSat{Hue: math.Mod(angle+180, 360), Sat: dist / 0.85}).ToRGB()

				img.Set(x, y, color2.RGBA{
					R: uint8(rgb.Red * 255.0),
					G: uint8(rgb.Green * 255.0),
					B: uint8(rgb.Blue * 255.0),
					A: 255,
				})
			} else {
				img.Set(x, y, color2.RGBA{R: 0, G: 0, B: 0, A: 0})
			}
		}
	}

	_ = png.Encode(os.Stdout, img)
}