Home / Community & Support / Developer Productivity Tools Forums / WPF > Chart > Multi-Threading Scatter Chart

• Alan

  Posted on Feb 1, 2012 (permalink)

  Hi, Are there any examples in the documentation which show how threading with the Chart works?
  
  Specifically, my issue is that I have a long loop which adds "Coordinate" objects to an ObservableCollection which is set as the ItemsSource of some ScatterSeries. Assume that this loop takes minutes to complete, as I add a Thread.Sleep(1000) for each iteration. Importantly, I would like the chart to display each "Coordinate" object as and when it is added to the ObservableCollection, without seizing up the whole chart.
  
  I have followed some examples of creating a Dispatcher, however this appears to have no effect. Example code of what I am trying to achieve:
  
  

  private ObservableCollection<Coordinate> coordinates = new ObservableCollection<Coordinate>();

  private Queue<Coordinate> coordinatesQueue = new Queue<Coordinate>();

   

  private void FillQueue()

  {

      .

      .

      .

  }

   

  private void UpdateChart()

  {

      SomeScatterSeriesinChart.ItemsSource = coordinates;

      this.Dispatcher.BeginInvoke(DispatcherPriority.Normal,

          (ThreadStart) delegate()

                  {

                      while (coordinatesQueue.Count != 0)

                      {

                          coordinates.Add(coordinatesQueue.Dequeue());

                          Thread.Sleep(1000);

                      }

                  }

      );

  }

  
  
  Thanks for any help in advanced!

  Reply

• Giuseppe Giuseppe

  Posted on Feb 6, 2012 (permalink)

  Hello Alan,
  
  You need to perform the data update in a BackgroundWorker thread to achieve the desired mutli-threading effect. Note, however, that if you are starting the project now, we would suggest you to consider using our new next-generation charting solution RadChartView instead as it was implemented with such scenarios in mind and works seamlessly out-of-the-box (RadChart would also work with a BackgroundWorker update but you will need to wrap the actual "update" call inside a Dispatcher.BeginInvoke(...) statement due to the specifics of the control implementation, while with RadChartView you do not need any UI hooks in your ViewModel to achieve the same effect).
  
  We have attached a sample application with RadChartView to get you started.
  
  
  Greetings,
  Giuseppe
  the Telerik team

  Sharpen your .NET Ninja skills! Attend Q1 webinar week and get a chance to win a license! Book your seat now >>

  Attached files

  • WpfApplication15.zip

  Reply

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