Hello.

I have a chart with multiple LineSeries.

The chart contains CategoryDateTimeXAxis and a numeric axis for the Y value.

I need to display error bar with diferent height for each point by using the custom DataCalculator.

this is based on the samples application. when using a fixed calculator, the error bar is displayed as expected, but when using the custom data calculator - it will not. also when changing the x axis to category - it also works.

this is my xaml :

<ig:XamDataChart Grid.Row="1" x:Name="LineChart" Tag="LineChart" Margin="0,0,0,0"
                        HorizontalZoomable="True" 
                        VerticalZoomable="True" >
            <ig:XamDataChart.Axes>
                <ig:CategoryDateTimeXAxis x:Name="ctxAxis" 
                                  Label="{}{Date}" DateTimeMemberPath="Date" />
                <ig:NumericYAxis x:Name="nryAxis" MinimumValue="0" MaximumValue="140" />
            </ig:XamDataChart.Axes>
            <ig:XamDataChart.Series>
 
 
                <ig:LineSeries x:Name="LineSeries1" Thickness="1" MarkerType="Circle"  Visibility="Collapsed"
                              
                              ValueMemberPath="Value"
                              XAxis="{Binding ElementName=ctxAxis}"
                              YAxis="{Binding ElementName=nryAxis}" IsHighlightingEnabled="True" IsTransitionInEnabled="True">
                    <ig:LineSeries.ErrorBarSettings>
                        <ig:CategoryErrorBarSettings EnableErrorBars="Both" ErrorBarCapLength="10"
                                                    Stroke="Green" StrokeThickness="1">
                            <ig:CategoryErrorBarSettings.Calculator>
                                <ig:DataCalculator ValueMemberPath="ErrorBar">
                                    <ig:DataCalculator.ItemsSource>
                                        <local:ErrorBarDataSample />
                                    </ig:DataCalculator.ItemsSource>
                                </ig:DataCalculator>
                            </ig:CategoryErrorBarSettings.Calculator>
                        </ig:CategoryErrorBarSettings>
                    </ig:LineSeries.ErrorBarSettings>
                </ig:LineSeries>
            </ig:XamDataChart.Series>
        </ig:XamDataChart>

and this is the code behind :

/// <summary>
   /// Interaction logic for MainWindow.xaml
   /// </summary>
   public partial class MainWindow : Window
   {
       public MainWindow()
       {
           InitializeComponent();
           SimpleDataCollection sd = new SimpleDataCollection();
           LineSeries1.Visibility = System.Windows.Visibility.Visible;
           LineSeries1.ItemsSource = sd;
         //  ((DataCalculator)LineSeries1.ErrorBarSettings.Calculator).ItemsSource = sd;
           LineSeries1.ErrorBarSettings.Calculator = new FixedValueCalculator() { Value=5 };
           ctxAxis.ItemsSource = sd;
 
       }
   }
 
   public class SimpleDataCollection : ObservableCollection<SimpleDataPoint>
   {
       public SimpleDataCollection()
       {
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(1), Label = "1", Value = 13.0, ErrorBar = 1 });
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(2), Label = "2", Value = 12.0, ErrorBar = 1 });
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(3), Label = "3", Value = 13.0, ErrorBar = 11 });
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(4), Label = "4", Value = 14.0, ErrorBar = 21 });
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(5), Label = "5", Value = 15.0, ErrorBar = 31 });
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(6), Label = "6", Value = 16.0, ErrorBar = 41 });
           this.Add(new SimpleDataPoint() { Date = DateTime.Today.AddHours(7), Label = "7", Value = 15.0, ErrorBar = 51 });
       }
   }
   /// <summary>
   /// Simple storage class for pair of string and double value
   /// </summary>
   public class SimpleDataPoint
   {
       public double Value { get; set; }
       public string Label { get; set; }
       public int ErrorBar { get; set; }
       public DateTime Date { get; set; }
   }
 
 
   public class ErrorBarDataSample : ErrorBarDataCollection
   {
       public ErrorBarDataSample()
           : this(0.1)
       { }
       public ErrorBarDataSample(double variable)
       {
           int items = 100;
           double value = 0;
           for (int i = 0; i < items - 1; i++)
           {
               this.Add(new ErrorBarDataPoint { ErrorBar = i });
               if (i < (items / 2)) value += variable; else value -= variable;
           }
       }
   }
 
   public class ErrorBarDataCollection : ObservableCollection<ErrorBarDataPoint>
   { }
   public class ErrorBarDataPoint
   {
       public double ErrorBar { get; set; }
   }