private Map<Long, Double> mapAxisX = new HashMap<>();
private int countAxisXTimes;
private double countAxisXSum;

@Override public double calculateMiddleVarOfAxisX(double axisX) {
    long current = System.currentTimeMillis();
    countAxisXTimes++;
    countAxisXSum += axisX;

    mapAxisX.put(current, axisX);

    if (mapAxisX.size() == 1) {
        return axisX;
    }

    Iterator iterator = mapAxisX.entrySet().iterator();

    while (iterator.hasNext()) {
        Map.Entry<Long, Double> point = (Map.Entry) iterator.next();
        long pointTime = point.getKey();
        long difference = current - pointTime;

        if (difference > 2000) {
            double val = point.getValue();
            countAxisXTimes--;
            countAxisXSum -= val;
            iterator.remove();
        }
    }

    double result = countAxisXSum / countAxisXTimes;
    //Logger.logGeneral(String.valueOf(result) + " size : " + mapAxisX.size());

    return result;
}

axisX = presenter.calculateMiddleVarOfAxisX(event.values[0]);

axisX = presenter.calculateMiddleVarOfAxisX(event.values[0]);
axisY = presenter.calculateMiddleVarOfAxisX(event.values[1]);

axisX = presenter.calculateMiddleVarOfAxisX(event.values[0]);
axisY = presenter.calculateMiddleVarOfAxisX(event.values[1]);