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 scrolling graph control: max num points?		  New Topic  Reply to Topic
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mhowe

1 Posts
Posted - 29 Jun 2004 :  16:15:03  Show Profile  Reply with Quote
Scrolling graph control
winaxc200
visual c++ net 7.1 (c++ code using atl)

We've introduced a scrolling graph control
(originally a sweeping graph, but problem
appears to exist under other types)
which fails under the following conditions

A loop generates data which is sent to the graph
via the .UpdateDynData() function. Only the 1st
500 points appear to be graphed.

Is this a known problem?
Please let me know if additional info is needed.

quinncurtis

1164 Posts
Posted - 30 Jun 2004 :  10:11:03  Show Profile  Reply with Quote
We modified our example program Simple, changing the update rate to 10 Hz, the sample interval to 0.1, and the x-axis maximimum value to 100.

m_RTScroll1.SetAxisMax (X_AXIS1, 100.0);
m_RTScroll1.SetScrollSampleInterval(0,0.1);
m_RTScroll1.SetTimerFrequency(10);


This results in a scrolling graph with 1000 points in the plotting area. The graph updated properly for the first 1000 points, and all subsequent updates past 1000 points. It also worked properly as a sweep graph. I am not sure what you mean by:

"Only the 1st 500 points appear to be graphed."

Can you describe how the example program Simple can be modified to reproduce your problem ?
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