WPF graphs: insert plot

[eugenem]

How do I insert or move plot to be the first?

graph.Plots.Insert(0, _newPlot)  throws exception regarding incorrect index

graph.Plots.Add( _newPlot )  appends a plot, so it's the last one

_newPlot.Index is read-only

[JeffL]

Hi eugenem,

Can you confirm if you are using any BarPlotRenderers or AreaPlotRenderers in the plots in front of which you are inserting your new plot? I have been able to recreate this issue with those conditions and will file an appropriate report.

As a workaround, if you need to insert on the fly, do not use those PlotRenderers.

[eugenem]

nope, I use LineRenderer, PointRenderer, or both (as a group)

[JeffL]

Hmm, I am unable to recreate it with those situations.

Could you post some of your XAML related to the renderers? Or anything else you think is relevant to the renderers.

[eugenem]

I build them from code, but there are some details:

_newPlot.Renderer
{PlotRendererGroup}
[NationalInstruments.Controls.Rendering.PlotRendererGroup]: {PlotRendererGroup}
base {System.Windows.Freezable}: {PlotRendererGroup}
SupportedRenderModes: Raster | Vector

(_newPlot.Renderer as PlotRendererGroup).PlotRenderers
{PlotRendererCollection: Count=2}
[0]: {LinePlotRenderer}
[1]: {PointPlotRenderer}

at then I do:

graph.Plots.Insert(0, _newPlot);

and get exception:

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

even like this it fails:

_newPlot = new Plot();

_newPlot.Renderer = new LinePlotRenderer() { Stroke = Brushes.White };

graph.Plots.Insert(0, _newPlot);

[Anjelica-W]

Does the error message provide any additional information? Can you provide a screenshot? Since that the error is referring to the index of a collection, I would try using the plot collection instead of plot class.

[phansen]

It looks like this is an issue with how the graph handles changing renderers associated with plots.

To workaround this, I would try adding a call to graph.Refresh(); after inserting the new plot, which should force the graph to update all plots immediately.

[eugenem]

Hi, Paul!

But it crashes the moment I insert plot. I won't be able to call Refresh...

Anyway, Plots.Add does work, but I'd like to control order of the plots as well.

[phansen]

Sorry that didn’t help (as Jeff mentioned, we are having trouble reproducing your original error, so this may be due to additional state configured on the graph, like render mode or data).

From your code snippet, it looks like you are only setting the Renderer property on the new plot. If so, another workaround would be to insert the renderer into the graph’s DefaultPlotRenderers collection, rather than changing the Plots collection.

If you do need to configure other plot members, the only other workaround I can think of for the currrent Measurement Studio release would be to use Add as you suggested, and assign the renderer to graph.Plots[insertIndex] instead of to _newPlot (and update the properties of all plots after the insert index).

[phansen]

Just wanted to let you know this issue was fixed in the Measurement Studio 2013 release.