public static double nextUp(double d) {
        if (Double.isNaN(d) || d == Double.POSITIVE_INFINITY) {
            return d;
        } else {
            d += 0.0;
            return Double.longBitsToDouble(Double.doubleToRawLongBits(d) + ((d >= 0.0) ? +1 : -1));
        }
    }
Returns next bigger double value considering precision of the argument.
hellocharts-library/src/lecho/lib/hellocharts/util/FloatUtils.java