topic Re: WPF graphs: insert plot in Measurement Studio for .NET Languages

WPF graphs: insert plot

eugenem — Mon, 19 Nov 2012 12:43:06 GMT

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

Re: WPF graphs: insert plot

JeffL — Mon, 19 Nov 2012 22:27:24 GMT

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.

Re: WPF graphs: insert plot

eugenem — Tue, 20 Nov 2012 08:01:26 GMT

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

Re: WPF graphs: insert plot

JeffL — Tue, 20 Nov 2012 15:54:11 GMT

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.

Re: WPF graphs: insert plot

eugenem — Thu, 22 Nov 2012 10:51:59 GMT

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);

Re: WPF graphs: insert plot

Anjelica-W — Mon, 26 Nov 2012 23:30:43 GMT

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.

Re: WPF graphs: insert plot

phansen — Tue, 27 Nov 2012 22:07:11 GMT

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.

Re: WPF graphs: insert plot

eugenem — Wed, 28 Nov 2012 08:24:51 GMT

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.

Re: WPF graphs: insert plot

phansen — Wed, 28 Nov 2012 19:35:24 GMT

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).

Re: WPF graphs: insert plot

phansen — Fri, 05 Apr 2013 17:49:58 GMT

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