Plotting AnalogWaveformCollection<double> data onto the WaveformGraph in Windows Form

[pwalake]

//Initialize component

 this.waveformGraph.Caption = "Oscilloscope";

this.waveformGraph.Location = new System.Drawing.Point(119, 21);

this.waveformGraph.Name = "waveformGraph";

this.waveformGraph.Plots.AddRange(new NationalInstruments.UI.WaveformPlot[] {

this.waveformPlot});

this.waveformGraph.Size = new System.Drawing.Size(505, 227);

this.waveformGraph.TabIndex = 0;

this.waveformGraph.XAxes.AddRange(new NationalInstruments.UI.XAxis[] {

this.xAxis});

this.waveformGraph.YAxes.AddRange(new NationalInstruments.UI.YAxis[] {

this.yAxis});

// waveformPlot

this.waveformPlot.DefaultWaveformPlotOptions = new NationalInstruments.UI.AnalogWaveformPlotOptions(NationalInstruments.UI.AnalogWaveformPlotDisplayMode.Samples, NationalInstruments.UI.AnalogWaveformPlotScaleMode.Raw, NationalInstruments.UI.AnalogWaveformPlotTimingMode.Auto);

this.waveformPlot.PointStyle = NationalInstruments.UI.PointStyle.SolidTriangleRight;

[D-Cubed]

Hi, Priyanka

Thank you for posting the code. I'm taking a look at it now. I also noticed that you opened a stack overflow question, and I have a question about that code. In the question you posted the following:

static void PlotWaveformsOnGraph(AnalogWaveformCollection<double> waveforms)
{
    List<AnalogWaveform<double>> waveformList = new List<AnalogWaveform<double>>(waveforms);
    MainWindow main = new MainWindow();
    main.waveformGraph.PlotWaveforms(waveformList.ToArray());
}

Is there a reason you are creating a new window in the PlotWaveformsOnGraph method? Do you eventually show the window using Application.Run?

Is your project WPF or Windows Forms? Up until this point, I was working under the assumption that you were using Windows Forms because of the classes you were using and the title of your thread. I apologize for not verifying this earlier.

[pwalake]

Hi Daniel,

I posted this before even I could get the example code of Measurement studio. Since then , the latest code is the code I posted in last message and I am working on that. 

I am using Windows Forms and sorry for the confusion about the new Window. The code you see is in a different class called NiScope , so I am creating object of my main window to plot the graph as I have my WaveformGraph on it. In short - from class NiScope I am accessing the objects of my main window.

[D-Cubed · Accepted solution]

Hi Priyanka

Thanks for explaining that a bit more. Let's try a different approach here. I have modified one of the shipping examples to demonstrate plotting on the waveform, and I attached it to this post. I have pasted some code here for convenience as well. If your application structure is significantly different than this example, please let me know. 

public partial class MainForm : Form
{
    NIScope scopeSession;

    public MainForm()
    {
        InitializeComponent();
        LoadScopeDeviceNames();
        ChangeControlState(true);
    }
	
	// ...

    void LoadScopeDeviceNames()
    {
        using (ModularInstrumentsSystem scopeDevices = new ModularInstrumentsSystem("NI-Scope"))
        {
            foreach (DeviceInfo device in scopeDevices.DeviceCollection)
            {
                resourceNameComboBox.Items.Add(device.Name);
            }
        }
        if (resourceNameComboBox.Items.Count > 0)
        {
            resourceNameComboBox.SelectedIndex = 0;
        }
    }
	
	// ...

    void acquireButton_Click(object sender, EventArgs e)
    {
        StartAcquisition();
    }
	
    void InitializeSession()
    {
        scopeSession = new NIScope(ResourceName, false, false);
        scopeSession.DriverOperation.Warning += new EventHandler<ScopeWarningEventArgs>(DriverOperation_Warning);
    }

    void StartAcquisition()
    {
        ChangeControlState(false);

        PrecisionTimeSpan timeout = new PrecisionTimeSpan(5.0);
        AnalogWaveformCollection<double> waveforms = null;
        try
        {
            InitializeSession();
            scopeSession.Measurement.AutoSetup();

            long recordLength = scopeSession.Acquisition.RecordLength;
            double sampleRate = scopeSession.Acquisition.SampleRate;

            waveforms = scopeSession.Channels[ChannelName].Measurement.Read(timeout, recordLength, waveforms);

            DisplayResults(recordLength, sampleRate);
            PlotWaveforms(sampledDataGridView, waveforms);
        }
        catch (Exception ex)
        {
            ShowError(ex);
        }
        finally
        {
            CloseSession();
            ChangeControlState(true);
        }
    }
	
	// ... 
	
    void PlotWaveforms(DataGridView dgv, AnalogWaveformCollection<double> waveforms)
    {
        var waveformsList = new List<AnalogWaveform<double>>(waveforms);
        this.waveformGraph.PlotWaveformsAppend(waveformsList.ToArray());
    }
	
	// ...
}

I added ellipses where I cut out code. I tested this code with a simulated 5122, and I was able to plot waveforms.

[pwalake]

Thank you so much Daniel.

It was not working since I was trying to create object of the main window and plot it. When I moved the code to Main window's code, it works perfectly fine now 🙂

[D-Cubed]

I'm glad to help

Good luck!