Is there a way to go from a Color to the HSV / HSL...

# compose-desktop

[Arjan van Wieringen]

Is there a way to go from a Color to the HSV / HSL values? I can not find any method in androidx.ui.graphics for this

[Arjan van Wieringen]

Found something here:
https://github.com/SmartToolFactory/Compose-Extended-Colors

[Sergey Y.]

https://developer.android.com/reference/androidx/core/graphics/ColorUtils?hl=en

[Michael Paus]

@Sergey Y. But that’s only Android, isn’t it? But this is the compose desktop channel.

[Sergey Y.]

I guess the topic starter confused the channel because he mentioned Android SDK package originally, and the question was about compose for android.

[Sergey Y.]

@Arjan van Wieringen #compose-android

[Arjan van Wieringen]

No I didn’t t confuse it. The compose desktop Jetbrains packages have a lot of Android package names in them

[Sebastian Schuberth]

Maybe https://github.com/ajalt/colormath#installation helps...

[Sergey Y.]

android.graphics package and androidx.* are not the same. android.graphics package is part of Android SDK and it only works on Android OS. Androidx is a collection of separate libraries and some of them can work on different platforms.

[Arjan van Wieringen]

You’re right, that was a typo on my part

[Alexander Maryanovsky]

ChatGPT suggests this:

import androidx.compose.ui.graphics.Color
import kotlin.math.max
import kotlin.math.min

fun Color.toHsl(): FloatArray {
    val r = red
    val g = green
    val b = blue

    val max = max(r, max(g, b))
    val min = min(r, min(g, b))

    val h: Float
    val s: Float
    val l = (max + min) / 2

    if (max == min) {
        // achromatic
        h = 0f
        s = 0f
    } else {
        val d = max - min
        s = if (l > 0.5f) d / (2 - max - min) else d / (max + min)
        h = when (max) {
            r -> (g - b) / d + (if (g < b) 6 else 0)
            g -> (b - r) / d + 2
            b -> (r - g) / d + 4
            else -> 0f
        }
    }

    val hsl = FloatArray(3)
    hsl[0] = h * 60 // converting to degrees
    hsl[1] = s
    hsl[2] = l
    return hsl
}

[Alexander Maryanovsky]

Or you can use java.awt.Color.*RGBtoHSB*

[Arjan van Wieringen]

I am in CommonMain so no Java.awt for me :)

[Alexander Maryanovsky]

You could do an expect/actual with ColorUtils on Android and awt Color on desktop.

[Alexander Maryanovsky]

Unless you need iOS, JS or native