Need urgent help regarding wxFreeChart

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seshikanth
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Need urgent help regarding wxFreeChart

Postby seshikanth » Thu May 13, 2010 11:58 am

Hi,

I am plotting a graph for my application using wxFreeChart.
Graph is about network statistics on y-axes and time on x axes.
At 1st second, i need to plot data on y-axes and for the 2nd second, i need to plot the data on y-axes. In precise, my graph is dynamic in similar to task manager performance monitor graph.

I downloaded wxFreeChart and going through the demo plots. My scenario is similar to XYDemo5 given in xydemos.cpp in sample programs. But when i execute the program binary of sample program, i am not getting any output for xy dynamic graph in wxFreeChart.

Any quick workaround would be greatly appreciated.

Thanks,
Seshikanth.

Blind_Cat
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Postby Blind_Cat » Sat May 15, 2010 9:45 am

Hello, seshikanth.

What version wxFreeChart? What version wxWidgets? What compiler? What OS?

That do not show dynamic changes? wxFreeChartDemo or your application?
WBR, Blind_Cat.

Alan Yaniger
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Postby Alan Yaniger » Tue May 18, 2010 2:30 pm

I'm having the same problem. I'm using wxWidgets 2.8.10, wxFreeChart 1.6 on Debian Lenny, gcc 4.3. When I run the demo, and open the category "XY Charts",and choose "XY Demo 5 - dynamic", it shows nothing. This, unfortunately. is exactly what I need a sample of. I need to be able to update a graph in real-time. Any help would be appreciated.

Blind_Cat
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Postby Blind_Cat » Wed May 19, 2010 9:47 am

Yes. It's really bug.

To see dynamic drawing change in file xydemos.cpp
at line 304
===
Add(y);
===

to
===
BeginUpdate();
Add(y);
EndUpdate();
===
WBR, Blind_Cat.

Alan Yaniger
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Postby Alan Yaniger » Wed May 19, 2010 6:14 pm

Andrey sent me a fix. Here's his message:

Here is the bug in dataset.cpp, it's present in 1.6 release, but fixed in SVN.

You can fix it by changing Dataset::DatasetChanged() method in dataset.cpp to following:

void Dataset::DatasetChanged()
{
if (m_updating) {
m_changed = true;
}
else {
FireDatasetChanged();
m_changed = false;
}
}

Alan Yaniger
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Postby Alan Yaniger » Thu May 20, 2010 3:53 pm

I'm still having a problem with dynamic graphs, though. When there's no activity, and a timer event adds to the dataset, as in the dynamic graph example, the graph gets properly updated. However, if I'm reading data from the serial port in a loop, the graph does not get updated until the loop exits, even if I add to the dataset. How can I get the graph to be updated during the loop which reads from the serial port?

Alan Yaniger
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Postby Alan Yaniger » Fri May 21, 2010 9:33 am

I ended up using a separate thread for reading from the serial port, and that seems to have gotten around the problem.


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