Converting from HSV (HSB in Java) to RGB without using java.awt.Color (disallowed on Google App Engine)

Question

I figured I should post this question, even if I have already found a solution, as a Java implementation was not readily available when I searched for it.

Using HSV

Answer 1

The solution was found here: http://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/

Martin Ankerl provides a good post on the subject, and provides Ruby script. For those too busy (or lazy) to implement it in Java, here's the one I did (I am sure it can be written more effectively, please feel free to comment):

public static String hsvToRgb(float hue, float saturation, float value) {
    float r, g, b;

    int h = (int)(hue * 6);
    float f = hue * 6 - h;
    float p = value * (1 - saturation);
    float q = value * (1 - f * saturation);
    float t = value * (1 - (1 - f) * saturation);

    if (h == 0) {
        r = value;
        g = t;
        b = p;
    } else if (h == 1) {
        r = q;
        g = value;
        b = p;
    } else if (h == 2) {
        r = p;
        g = value;
        b = t;
    } else if (h == 3) {
        r = p;
        g = q;
        b = value;
    } else if (h == 4) {
        r = t;
        g = p;
        b = value;
    } else if (h <= 6) {
        r = value;
        g = p;
        b = q;
    } else {
        throw new RuntimeException("Something went wrong when converting from HSV to RGB. Input was " + hue + ", " + saturation + ", " + value);
    }

    String rs = Integer.toHexString((int)(r * 255));
    String gs = Integer.toHexString((int)(g * 255));
    String bs = Integer.toHexString((int)(b * 255));
    return rs + gs + bs;
}