In our application a varying number of charts can be created based upon user configuration. The axis information is also user configurable, and this is where the problem comes in.
In creating the axes for the chart, can the name be bound to a property on our axis viewmodel? (I do not think so as my experimentation with x:Name={Binding Path=ViewModel.Name} so far) or is there some way to use RelativeSource binding to locate the axis information? Can this be done for the legend as well? Thank you!
Hello Colin,
If you have a sample that you could upload that would be great to better understand what you are doing and serve as a base to try and find a resolution.
Thanks,
Valerie
Hello Valerie,
Unfortunately some of our charts require line data along with range/range column data. Hmm. Is there any way to manually trigger the update, via an event or command of some sort that could be bound to? Or is that beyond the scope of the charts and am I stuck with whatever first series is bound being the one that defines when the axis is updated?
In my own testing I found that the chart is updated regardless of the number of points in a series (I had a sample where one series had 6 points to start with and one had 3), that the axis would only update based on the series it bound to, but the chart would still update each series when it had new data. If you're curious for the code that reproduces this I can zip and upload it; along with instructions on how to see the changing axis update behavior.
I did find my answer to the legend issue, by the way. I had to add one extra line of code in there to add the legend to the children of the XamDock in code. IE: (Chart.Parent as XamDock).Children.Add(legendObject); accomplished it.
Hello Collin,
The issue may be the type of chart you are using many of the chart require that the Series have the same data points in each series , therefore when your second collection changes it may not be displayed until the first collection also contains the same number. You can use a scatter line series which does not have this requirement when using the scatter line series when either series is updated the chart will be updated. This may eliminate your need to change the axis. See attached sample to let me know if this will meet your requirements. If this does fit your needs it appears that it would eliminate the need to add the legend in the code behind.
Okay, I'll see if I can explain differently to fully convey the scenario. There's two real issues, one is creating a legend in the code-behind that will display on the chart. I have the chart being placed inside a XamDock, then the legend is added to the chart in the code behind via:
var legend = new Legend {Content = "Common Legend", Margin = new Thickness(10) };
XamDock.SetEdge( legend, DockEdge.InsideRight );
Chart1.Legend = legend;
But I don't see any legend generated.
The other problem is with the axis. I can get the axis to show up, but there are multiple series in a chart and the series get updated asynchronously, but to the same points in the end. So for example; series1 and series2 may have 50 datapoints starting out, then series2 gets updated to 60 points, then series 1 gets updated to 60 points, but during the period between series 2 being updated and series 1 being updated the new data is not displayed. Axis is bound initially to series1, which I believe is the problem, but I cannot find a way in the code behind to bind the series to a series collection viewmodel, which holds the series objects.
Hopefully that explains better! If it's still confusing I'll try to figure out how to paste code so it shows up readable to explain better what I'm after.
Hello,
The x:Name directive uniquely identifies XAML-defined elements in a XAML namescope the name is equivalent to the variable that holds an object reference or an instance as returned by a constructor so binding not a valid value for this property. You can bind to a different ItemsSource to change the data used by the axis or you can add the axis to the grid at runtime. Please let me know more about what you are trying to accomplish if you need further assistance.