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<s:SciChartGroup Grid.Row="1" Name="charts" 
                     ItemsSource="{Binding ChartPaneViewModels}" 
                     s:ThemeManager.Theme="{Binding ElementName=ThemeCombo, Path=SelectedItem}"
                     ItemContainerStyle="{StaticResource ChartPaneStyle}">
        <s:SciChartGroup.ItemTemplate>
            <DataTemplate x:Name="template">
                <s:SciStockChart Padding="0" 
                                 BorderThickness="0,0,1,1" *** Annotations="{Binding TradeAnnotations}"<--How to binding this to first chart? ***
                                 IsXAxisVisible="{Binding IsFirstChartPane}" 
                                 IsPanEnabled="{Binding ParentViewModel.IsPanEnabled}"
                                 IsRubberBandZoomEnabled="{Binding ParentViewModel.IsZoomEnabled}" 
                                 VerticalChartGroupId="{Binding ParentViewModel.VerticalChartGroupId}"    
                                 ViewportManager="{Binding ParentViewModel.ViewportManager}" IsRolloverEnabled="True" 
                                 SeriesSource="{Binding ChartSeriesViewModels}">
                    <s:SciStockChart.XAxis>
                        <s:CategoryDateTimeAxis Name="xAxis" 
                                                TextFormatting="MM-dd HH:mm:ss" 
                                                VisibleRange="{Binding ParentViewModel.XVisibleRange, Mode=TwoWay}"
                                                DrawMajorBands="False"
                                                DrawMinorGridLines="True"
                                                GrowBy="0,0.05"/>
                    </s:SciStockChart.XAxis>
                    <s:SciStockChart.XAxisStyle>
                        <Style TargetType="s:CategoryDateTimeAxis">
                            <Setter Property="DrawMajorBands" Value="True"/>
                            <Setter Property="DrawMinorGridLines" Value="False"/>
                            <Setter Property="VisibleRange" Value="{Binding ParentViewModel.XVisibleRange, Mode=TwoWay}"/>
                            <Setter Property="GrowBy" Value="0, 0.05"/>
                        </Style>
                    </s:SciStockChart.XAxisStyle>
                    <s:SciStockChart.YAxes>
                        <s:NumericAxis AutoRange="Always"
                            Id="Y2"/>
                    </s:SciStockChart.YAxes>
                    <s:SciStockChart.YAxisStyle>
                        <Style TargetType="s:NumericAxis">
                            <Setter Property="AutoRange" Value="Always"></Setter>
                            <Setter Property="TextFormatting" Value="{Binding YAxisTextFormatting}"/>
                            <Setter Property="MinorsPerMajor" Value="{Binding IsFirstChartPane, Converter={StaticResource MinorsPerMajorConverter}}"/>
                            <Setter Property="MaxAutoTicks" Value="{Binding IsFirstChartPane, Converter={StaticResource MaxAutoTicksConverter}}"/>
                            <Setter Property="GrowBy" Value="{Binding IsFirstChartPane, Converter={StaticResource GrowByConverter}}"/>
                        </Style>
                    </s:SciStockChart.YAxisStyle>
                </s:SciStockChart>
            </DataTemplate>
        </s:SciChartGroup.ItemTemplate>
    </s:SciChartGroup>
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Hi Hwa,

You have a collection of ChartPaneViewModels right?

Then you can expose an AnnotationCollection on a chart pane viewmodel, e.g.

public class ChartPaneViewModel
{
    private AnnotationCollection _annotationCollection = new AnnotationCollection();

    public ChartPaneViewModel()
    {
         // Then only for first ChartPaneViewModel add one annotation
        _annotationCollection.Add(new TextAnnotation() { Text="Hello!", X1=0, Y1=100};
    }
     public AnnotationCollection { get { return _annotationCollection; } } 
}

Then you can bind to it in the View like this

<s:SciChartGroup 
                        ... >
        <s:SciChartGroup.ItemTemplate>
            <DataTemplate x:Name="template">
                <s:SciStockChart Padding="0"
                                 ...
                                 Annotations="{Binding AnnotationCollection}>
                           ...
                </s:SciStockChart>
            </DataTemplate>
        <s:SciChartGroup.ItemTemplate>
 </s:SciChartGroup>

If you want to extend this to be more MVVM friendly, please see this article: Editing annotations and keeping track of them in an mvvm application

Best regards,
Andrew

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Hi Andrew
Thanks for your reply .

 public class AbtChartControl_ViewModel : BaseViewModel
{
    public AbChartControl_ViewModel(Strategy s)
    {
        s.AddTradeFlagHandler += AddAnnotation;
        _annotations = new AnnotationCollection();
        _chartPaneViewModels.Add(new OhlcPaneViewModel(this, s) { IsFirstChartPane = true });
        _chartPaneViewModels.Add(new VolumePaneViewModel(this, s);
    }
    private void AddAnnotation(TradeFlagEventArgs e)
    {
       IAnnotation annotation;
       if (e.Direction == EDirection.Buy)
           annotation = new BuyMarkerAnnotation() { X1 = e.Datetime, Y1 = e.Price, };
       else
           annotation = new SellMarkerAnnotation() { X1 = e.Datetime, Y1 = e.Price };
       this._annotations.Add(annotation);
    }
    private AnnotationCollection _annotations;
    public AnnotationCollection TradeAnnotations
    {
        get { return _annotations; }
        set
        {
            _annotations = value;
            RaisePropertyChanged("TradeAnnotations");
        }
    }

}

Then I bind to View as you , run it , An exception occurs :
System.NullReferenceException

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On not ItemTemplate, Running normally , But I do not know much about modifier , I don’t know set
Pan, Zoom , VisibleRange , etc.

  • Hwa Fun
    to replace a version is no problem
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