class FuAlgo {

    double getHue(double chrX, double chrY) {
        double atan2 = Math.atan2((chrY - CONST_WHITE_POINT), (chrX - CONST_WHITE_POINT));
        final double hue = (180 * atan2) / Math.PI;
        return hue < 0 ? hue + 360 : hue;
    }

    public  FuAlgo(Instrument instrument);
      FuAlgo();

}