Disappearing plot line when zoomed

I am having a problem with my CNiGraph plot line disappearing when the axes min and max are explicitly defined and they are substantially smaller than they would be if the graph were autoscaled. I am using measurement studio 8.6.1.465 and NiDaqmx 9.0.2 on windows XP. I am controlling axis scale either by SetAutoScale() or SetMinMax(). My code is rather large, so I am including snippets of what I am doing below.
I noticed a thread with a similar problem at:
http://forums.ni.com/ni/board/message?board.id=232&message.id=3769&query.id=1275984#M3769
Please help! I have tried window invalidation, turning on/off immediate updates to the graph, setting axes visible/invisible, etc.
-drew
Setup code:
CNiPlot plot = m_pGraph->GetPlots().Add();
       CNiCursor cursor = m_pGraph->GetCursors().Add();
       //cursor.SetSnapMode(CNiCursor:napPointsOnPlot);
       cursor.SetSnapMode(CNiCursor:napNearestPoint);
       cursor.SetVisible(true);
       cursor.SetPointStyle(CNiCursor:ointCross);
       cursor.SetCrosshairStyle(CNiCursor::CrosshairNone);
       cursor.SetColor(CNiColor(255,255,255));
       cursor.SetPlot(plot);
       CNiAxes axes = m_pGraph->GetAxes();
       CNiAxis xAxis, yAxis;
       xAxis = axes.Item(1);
       yAxis = axes.Item(2);
        yAxis.FormatString = ".##e";
        xAxis.FormatString = "hh:nn:ss";
        CNiColor lineColor(m_plotArray[i]->m_lineColor);
       plot.LineColor = lineColor;
        plot.XAxis.GetTicks().SetMajorGrid(true);
       plot.YAxis.GetTicks().SetMajorGrid(true);
       plot.XAxis.GetTicks().SetMajorGridColor(CNiColor(60,60,60));
       plot.YAxis.GetTicks().SetMajorGridColor(CNiColor(60,60,60));
    m_pGraph->ChartLength = m_graphLength;
   m_pGraph->ChartStyle = CNiGraph::ChartStrip;
   m_pGraph->SetImmediateUpdates(true);
Graphing:
CNiReal64Matrix newData;
m_pGraph->GetPlots().Item(i+1).ChartXY(newData);
m_pGraph->GetCursors().Item(i+1).SetPosition(newData(0,maxCol),
                                                                    newData(1,maxCol));
Solved!
Go to Solution.

I managed to fix this problem, noticing that panning the graph caused the line to redraw properly. I added a very small amount of 'jitter' to the X axis each time after ChartXY is called. Since autoscale mode seems to refresh just fine, i only introduce jitter if the axis min/max is set explicitly:
if (!m_pGraph->Axes.Item("XAxis").GetAutoScale()){
        static double plusMinus = 1.0;
        m_pGraph->Axes.Item("XAxis").SetMinMax(m_pGraph->Axes.Item("XAxis").GetMinimum()+(plusMinus*0.000000001),
                                                m_pGraph->Axes.Item("XAxis").GetMaximum()+(plusMinus*0.000000001));
        plusMinus *= -1.0;
It seems this is a bug in the graph control since there is no problem with the cursor drawing properly and I should not need to write code like this to keep my plot lines from disappearing?
-drew

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