Golang golang-color (snippet)

Go programming example 'golang-color'

golang-color

Golang beginners example: golang-color

package main

import (
    "fmt"
    "math"
)

func rgb2hsl(r int, g int, b int) (int, int, int) {
    var rf, gf, bf, max, min, l, d, s, h float64

    rf = math.Max(math.Min(float64(r)/255, 1), 0)
    gf = math.Max(math.Min(float64(g)/255, 1), 0)
    bf = math.Max(math.Min(float64(b)/255, 1), 0)
    max = math.Max(rf, math.Max(gf, bf))
    min = math.Min(rf, math.Min(gf, bf))
    l = (max + min) / 2

    if max != min {
        d = max - min
        if l > 0.5 {
            s = d / (2 - max - min)
        } else {
            s = d / (max + min)
        }
        if max == rf {
            if gf < bf {
                h = (gf-bf)/d + 6
            } else {
                h = (gf - bf) / d
            }
        } else if max == gf {
            h = (bf-rf)/d + 2
        } else {
            h = (rf-gf)/d + 4
        }
    } else {
        h = 0
        s = 0
    }

    return int(h * 60), int(s * 100), int(l * 100)
}

func main() {
    fmt.Println(rgb2hsl(121, 167, 22))
    fmt.Println(rgb2hsl(69, 209, 237))
    fmt.Println(rgb2hsl(254, 207, 37))
    fmt.Println(rgb2hsl(122, 167, 255))
    fmt.Println(rgb2hsl(255, 255, 255))
}

Useful links

• Learn Go: https://golangr.com
• Download Go: https://golang.org