color.js

// See http://snipplr.com/view/14590/
function hsvToRgb(h, s, v) {
    var r, g, b;
    var i;
    var f, p, q, t;

    // Make sure our arguments stay in-range
    h = Math.max(0, Math.min(360, h));
    s = Math.max(0, Math.min(1, s));
    v = Math.max(0, Math.min(1, v));

    if(s == 0) {
        r = g = b = v;
    } else {
        h /= 60;
        i = Math.floor(h);
        f = h - i;
        p = v * (1 - s);
        q = v * (1 - s * f);
        t = v * (1 - s * (1 - f));

        switch(i) {
            case 0: r = v; g = t; b = p; break;
            case 1: r = q; g = v; b = p; break;
            case 2: r = p; g = v; b = t; break;
            case 3: r = p; g = q; b = v; break;
            case 4: r = t; g = p; b = v; break;
            case 5: r = v; g = p; b = q;
        }
    }

    return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}

// See http://www.javascripter.net/faq/rgbtohex.htm
function rgbToHex(r, g, b) {
    return toHex(r) + toHex(g) + toHex(b);
}

function toHex(n) {
 n = Math.max(0, Math.min(n, 255));
 return '0123456789ABCDEF'.charAt((n - n % 16) / 16)
      + '0123456789ABCDEF'.charAt(n % 16);
}

function hsvToHex(h, s, v) {
    rgb = hsvToRgb(h, s, v);
    return rgbToHex(rgb[0], rgb[1], rgb[2]);
}