Oxyplot - WPF invalidate plotview

Question

I am using Oxyplot for my WPF app. I want to capture some data and after that I want to show them in graph. I have this code in XAML:

xmlns:oxy="http://oxyplot.org/wpf"


 <Window.DataContext>
        <local:MainViewModel/>
  </Window.DataContext>
  <oxy:PlotView Title="{Binding Title}" Margin="241,0,0,179" Name="Plot1" Grid.Column="2">
       <oxy:PlotView.Series>
            <oxy:LineSeries ItemsSource="{Binding Points}"/>
        </oxy:PlotView.Series>
  </oxy:PlotView>

And Class:

public class MainViewModel
{
    /// <summary>
    /// 
    /// </summary>
    /// 
    public MainViewModel()
    {
        this.Title = "Sin";

        this.Points = new List<DataPoint>();

        for (int i = 0; i <= 800; i++)
        {
            double x = (Math.PI * i) / 400;
            double y = Math.Sin(x);
            DataPoint p = new DataPoint(x, y);
            Points.Add(p);
        }
        /*this.Points = new List<DataPoint>
         {
                              new DataPoint(0, 4),
                              new DataPoint(10, 13),
                              new DataPoint(20, 15),
                              new DataPoint(30, 16),
                              new DataPoint(40, 12),
                              new DataPoint(50, 12)
                          };*/
    }

    public string Title { get; private set; }

    public IList<DataPoint> Points { get; private set; }

    public void Second()
    {
        this.Points.Clear();
        this.Title = "Test";

        this.Points = new List<DataPoint>();

        for (int i = 0; i <= 800; i++)
        {
            double x = (Math.PI * i) / 400;
            double y = Math.Cos(x);
            DataPoint p = new DataPoint(x, 0.5);
            Points.Add(p);
        }
    }

}

Thing is, that I want after clicking button show plot from "Second()". It is performed by calling method Second() and after Plot1.InvalidatePlot(true), but it does nothing. Where am I doing mistake, please help? Thanks

Teocci · Accepted Answer · 2017-04-19 05:01:48Z

1

Currently, the answer might be changed and it has been mentioned here

Change the Model property of the PlotView control

Call Invalidate on the PlotView control

Call Invalidate on the PlotModel

I suggest you to remove "PropertyChanged" and insert this into the updating method.

PlotModel.InvalidatePlot(true);

edited Apr 19, 2017 at 5:01

Teocci

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answered Apr 19, 2017 at 2:03

taka23

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Comments

AnjumSKhan · Accepted Answer · 2015-10-17 14:50:41Z

0

Change to <oxy:LineSeries ItemsSource="{Binding Points, Mode=OneWay}"/>

This will ensure changes to Points is propagated to your chart control. And secondly, implement INotifyPropertyChanged in your ViewModel class. Eg;

IList<DataPoint> _points;
public IList<DataPoint> Points { get{return _points;}; private set{ _points = value; OnPropertyChanged("Points");} }

        private void OnPropertyChanged(string p)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(p));
        }

public void Second()
    {
        this.Points.Clear();
        this.Title = "Test";

        this.Points = new List<DataPoint>();

        for (int i = 0; i <= 800; i++)
        {
            double x = (Math.PI * i) / 400;
            double y = Math.Cos(x);
            DataPoint p = new DataPoint(x, 0.5);
            Points.Add(p);
        }
        /* suggested change */
        OnPropertyChanged("Points");
    }

answered Oct 17, 2015 at 14:50

AnjumSKhan

9,8471 gold badge30 silver badges39 bronze badges

4 Comments

stanedav Over a year ago

Thanks, I added rows mentioned above and also INotify by this code: public class MainViewModel : INotifyPropertyChanged and public event PropertyChangedEventHandler PropertyChanged; but plot is still not refreshed.

AnjumSKhan Over a year ago

@stanedav plot is refreshing 110%. I have downloaded OxyPlot package and ran your sample. It seems you are not aware of how to use Binding mechanism properly. Uploaded a sample, check it dropbox.com/s/pe0ifbivt8pqhbh/OxyPlotGraphs.rar?dl=0

stanedav Over a year ago

sorry my bad, you are my hero :)

AnjumSKhan Over a year ago

@stanedav <oxy:LineSeries ItemsSource="{Binding Points}"/> is ok too, but it uses two-way binding which is not needed in your case.

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