public boolean computeScroll() {
        boolean needInvalidate = false;
        if (isScrollEnabled && chartScroller.computeScrollOffset(computator)) {
            needInvalidate = true;
        }
        if (isZoomEnabled && chartZoomer.computeZoom(computator)) {
            needInvalidate = true;
        }
        return needInvalidate;
    }
Computes scroll and zoom using {@link ChartScroller} and {@link ChartZoomer}. This method returns true if
scroll/zoom was computed and chart needs to be invalidated.
hellocharts-library/src/lecho/lib/hellocharts/gesture/ChartTouchHandler.java