@Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            return super.onScroll(e1, e2, -distanceX, -distanceY);
        }
Touch Handler for preview charts. It scroll and zoom only preview area, not all preview chart data.
hellocharts-library/src/lecho/lib/hellocharts/gesture/PreviewChartTouchHandler.java