Re: Grid not Synchronised with the chart

[User (Legacy)]

Thank you for your reply, 

Yes, the Data - Editor is not synchronised with the Chart. 

This is what I am doing. 

I have set the following properties for my real time chart. 

 // Set the mask to instruct the chart to track the mouse and to evenly 

space the x axis 

m_spChartFX->TypeMask = (CfxType) (m_spChartFX->TypeMask | CT_TRACKMOUSE | 

CT_EVENSPACING); 

 // Set the real time style for the chart 

 m_spChartFX->RealTimeStyle = (CfxRealTimeStyle) (m_spChartFX->RealTimeStyle 

| CRT_LOOPPOS | CRT_NOWAITARROW); 

 m_spChartFX->PutTypeEx(CTE_NOLEGINVALIDATE); 

 // Put a scrollbar for the chart (x axis scrollbar) 

 m_spChartFX->PutScrollable(true); 

 // Recalculate the new XMin and XMax values whenever a new value is added 

to the chart 

 m_axisX->PutAutoScale(true); 

I then set a timer that runs every 1 second and I just insert some random 

data into a series as follows: 

N.B.  m_traceVariables is an array (CSimpleArray in ATL) of the series that 

I have configured for the present chart, and the m_item member in this array 

is the unique id for the series, i.e. numbers from 0 - n. 

 m_spChartFX->OpenDataEx((CfxCod) (COD_VALUES | COD_ADDPOINTS), 

m_traceVariables.GetSize(), 1); 

 // Loop throug all configured series and add the data point. 

 for (short i = 0; i < m_traceVariables.GetSize(); i++) { 

  m_traceVariables[i]->m_value = rand() % 100; 

  // Add the new data point for the series. 

  m_spChartFX->ValueEx[m_traceVariables[i]->m_item][0] = 

m_traceVariables[i]->m_value; 

 } 

 // Closing the data channel using COD_SMOOTH will stop screen flickering 

 m_spChartFX->CloseData((CfxCod) (COD_VALUES | COD_REALTIME | COD_SMOOTH | 

COD_REALTIMESCROLL)); 

When I display the Data - Editor as this chart is scrolling, the last value 

I added could be 39 but the Data-Editor will show the value for point 39 as 

point 40.  It seems to me that the Data-Editor has an n+1 symptom for it 

column display. 

I tried the MFC sample provided with the Chart but the real time chart seems 

to be limited to 20 points and the data in the Data Editor does not scroll. 

Actually, on this point, the reason that I have set my Chart to unlimited is 

that I need to display say 15 points, but I would like the Chart to cache 

upto say 1000 points so that the user may easily scroll back in time.  When 

I tried doing this using a limited real time chart, the chart formatted 

itself to display all 1000 points on the screen.  Is there a way I can have 

the chart store more data than I would like it to display without using an 

unlimited real time chart, since I noticed that from the documentation and 

for the sake of memory efficieny a limited real time chart would be more 

ideal for my implementation. 

Your help is appreciated. 

Frank Cammaroto 

Francisco Padron wrote in message ... 

>You mean the Data-Editor ? can you please explain a little more. 

> 

>Also, does this happen with the Real-Time sample provided. 

> 

>Frank 

>SFX 

>