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SCSFExport scsf_123_RedrawWithOverlay(SCStudyInterfaceRef sc)
{
  SCString msg;

  if (sc.SetDefaults)
  {
    sc.GraphName = "123_RedrawWithOverlay";
    sc.AutoLoop = 1; //Automatic looping is enabled.
    sc.DrawZeros = 0;
    sc.UpdateAlways = 1;

    sc.Subgraph[0].Name = "Value";
    sc.Subgraph[0].DrawStyle = DRAWSTYLE_LINE;
    sc.Subgraph[0].PrimaryColor = RGB(0, 255, 0);

    return;
  }

  if (sc.GetBarHasClosedStatus() == BHCS_BAR_HAS_NOT_CLOSED)
  {
    return;
  }

  if (sc.Index < sc.ArraySize - 2)
  {
    // only process if on last bar on chart
    return;
  }

  int bucketSize = 10; // even number is best

  if ((sc.Index % bucketSize) < bucketSize/2)
  {
    if ((sc.Index % bucketSize) == 0)
    {
      // show all the SG data back to index 0
      // by setting value to 0
      for (int barIndex = 0; barIndex <= sc.Index; barIndex++)
      {
        sc.Subgraph[0][barIndex] = sc.Low[barIndex];
      }

      if (!sc.IsFullRecalculation)
      {
        sc.EarliestUpdateSubgraphDataArrayIndex = 0;
        msg.Format("%d: Show all", sc.Index);
        sc.AddMessageToLog(msg, 1);
      }
    }
    else
    {
      // just update this index
      sc.Subgraph[0][sc.Index] = sc.Low[sc.Index];
    }
  }
  else
  if ((sc.Index % bucketSize) == bucketSize / 2)
  {
    // hide all the SG data back to index 0
    // by setting value to 0
    for (int barIndex = 0; barIndex <= sc.Index; barIndex++)
    {
      sc.Subgraph[0][barIndex] = 0;
    }

    if (!sc.IsFullRecalculation)
    {
      sc.EarliestUpdateSubgraphDataArrayIndex = 0;
      msg.Format("%d: Hide all", sc.Index);
      sc.AddMessageToLog(msg, 1);
    }
  }
}

SCSFExport scsf_123_RedrawWithOverlay(SCStudyInterfaceRef sc)
{
  SCString msg;
  int& r_RecalculateFlag = sc.GetPersistentIntFast(5);

  if (sc.SetDefaults)
  {
    sc.GraphName = "123_RedrawWithOverlay";
    sc.AutoLoop = 0; // DO NOT USE AutoLoop, manual only
    sc.DrawZeros = 0;
    sc.UpdateAlways = 1;

    sc.Subgraph[0].Name = "Value";
    sc.Subgraph[0].DrawStyle = DRAWSTYLE_LINE;
    sc.Subgraph[0].PrimaryColor = RGB(0, 255, 0);

    r_RecalculateFlag = 0;

    return;
  }

  // manual looping index so we can override sc.UpdateStartIndex when needed
  int scUpdateStartIndex;
  scUpdateStartIndex = sc.UpdateStartIndex;

  if (r_RecalculateFlag == 1)
  {
    // ensure we are being called with IsFullRecalculation and not just on a timer/event
    if (sc.IsFullRecalculation)
    {
      r_RecalculateFlag = 0;
    }
    return;
  }

  if (scUpdateStartIndex == 0) {
    // clear all SGs so Recalculate works properly
    for (int i = 0; i < SC_SUBGRAPHS_AVAILABLE; i++) {
      for (int barIndex = 0; barIndex < sc.ArraySize; barIndex++)
      {
        sc.Subgraph[i][barIndex] = 0;
      }
    }
  }

  bool shouldRecalculateChart = false;
  int bucketSize = 10; // even number is best

  for (int barIndex = scUpdateStartIndex; barIndex < sc.ArraySize; barIndex++)
  {
    if (sc.GetBarHasClosedStatus(barIndex) == BHCS_BAR_HAS_NOT_CLOSED)
    {
      return;
    }

    if ((barIndex % bucketSize) < bucketSize / 2)
    {
      if ((barIndex % bucketSize) == 0)
      {
        // show all the SG data back to index 0
        // by setting value to 0
        for (int barIndex = 0; barIndex < sc.ArraySize; barIndex++)
        {
          sc.Subgraph[0][barIndex] = sc.Low[barIndex];
        }
        shouldRecalculateChart = true;
        msg.Format("%d: Show all", barIndex);
        sc.AddMessageToLog(msg, 1);

        if (!sc.IsFullRecalculation)
        {
          sc.EarliestUpdateSubgraphDataArrayIndex = 0;
        }
      }
      else
      {
        // just update this index
        sc.Subgraph[0][barIndex] = sc.Low[barIndex];
      }
    }
    else
    if ((barIndex % bucketSize) == bucketSize / 2)
    {
      // hide all the SG data back to index 0
      // by setting value to 0
      for (int barIndex = 0; barIndex < sc.ArraySize; barIndex++)
      {
        sc.Subgraph[0][barIndex] = 0;
      }
      shouldRecalculateChart = true;

      msg.Format("%d: Hide all", barIndex);
      sc.AddMessageToLog(msg, 1);

      if (!sc.IsFullRecalculation)
      {
        sc.EarliestUpdateSubgraphDataArrayIndex = 0;
      }
    }
  }

  if (shouldRecalculateChart)
  {
    sc.RecalculateChart(sc.ChartNumber);
    r_RecalculateFlag = 1;
  }
}