How can I use the HSL colorspace in Java?

Question

I\'ve had a look at the ColorSpace class, and found the constant TYPE_HLS (which presumably is just HSL in a different order).

Can I use this const

Answer 1

Here is a simple implementation that will return a Color based on hue, saturation, and lightness values from 0.0 to 1.0...

static public Color hslColor(float h, float s, float l) {
    float q, p, r, g, b;

    if (s == 0) {
        r = g = b = l; // achromatic
    } else {
        q = l < 0.5 ? (l * (1 + s)) : (l + s - l * s);
        p = 2 * l - q;
        r = hue2rgb(p, q, h + 1.0f / 3);
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1.0f / 3);
    }
    return new Color(Math.round(r * 255), Math.round(g * 255), Math.round(b * 255));
}

EDIT by Yona-Appletree:

I found what I think is the correct hue2rgb function and tested it as working:

private static float hue2rgb(float p, float q, float h) {
    if (h < 0) {
        h += 1;
    }

    if (h > 1) {
        h -= 1;
    }

    if (6 * h < 1) {
        return p + ((q - p) * 6 * h);
    }

    if (2 * h < 1) {
        return q;
    }

    if (3 * h < 2) {
        return p + ((q - p) * 6 * ((2.0f / 3.0f) - h));
    }

    return p;
}