求dev控件RealtimeChart回放思路

Question

RealtimeChart特点是随着时间的推移，会在左侧移除掉多余的散点。
如果用户要回放之前的散点，会带来两个问题：
1.移除的散点需要保存到一个集合或者数据库中，才能再次看到，是这种搞法吧？
2.加载移除的散点时，实时采集仍要进行。此时，应该怎样将移除的散点与实时采集的散点整合在一个曲线图里？

 DateTime argument = DateTime.Now;
            SeriesPoint[] pointsToUpdate1 = new SeriesPoint[Interval];
            SeriesPoint[] pointsToUpdate2 = new SeriesPoint[Interval];
            for (int i = 0; i < Interval; i++) {
                pointsToUpdate1[i] = new SeriesPoint(argument, value1);
                pointsToUpdate2[i] = new SeriesPoint(argument, value2);
                argument = argument.AddMilliseconds(1);
                UpdateValues();
            }
            DateTime minDate = argument.AddSeconds(-TimeInterval);
            int pointsToRemoveCount = 0;
            foreach (SeriesPoint point in Series1.Points)
                if (point.DateTimeArgument < minDate)
                    pointsToRemoveCount++;
            if (pointsToRemoveCount < Series1.Points.Count)
                pointsToRemoveCount--;
            AddPoints(Series1, pointsToUpdate1);
            AddPoints(Series2, pointsToUpdate2);
            if (pointsToRemoveCount > 0) {
                Series1.Points.RemoveRange(0, pointsToRemoveCount);
                Series2.Points.RemoveRange(0, pointsToRemoveCount);
            }
            SwiftPlotDiagram diagram = chart.Diagram as SwiftPlotDiagram;
            if (diagram != null && (diagram.AxisX.DateTimeScaleOptions.MeasureUnit == DateTimeMeasureUnit.Millisecond || diagram.AxisX.DateTimeScaleOptions.ScaleMode == ScaleMode.Continuous))
                diagram.AxisX.WholeRange.SetMinMaxValues(minDate, argument);

Answer 1

你就不能把实时曲线和历史曲线分开吗，非要在一个界面上同时显示这两个功能？