How to show the index of value in an x-axis collection on the SciChartSurface?

take the SciChart Trader as an example, x-Axis is type of CategoryDateTimeAxis. I want a way to show the index of the time in the collection, when mouse moves over the price bar in some mode like Rollover or Cursor.

regards
chunxi

WPF Axis CoordinateCalculator

chunxi asked 8 years ago
last edited 8 years ago

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Answers (3)

Hi there,

If you need to add index of current point into tooltip label – you could use SeriesInfo.DataSeriesIndex value :

<DataTemplate x:Key="ChartDataTemplate" DataType="s:SeriesInfo">

        <TextBlock Text="{Binding DataSeriesIndex}"/>

</DataTemplate>

If you need to add index into axis tooltip – this would require some additional customization:

You need to create custom AxisInfo and add index property;
Then you need to override CategoryDateTimeAxis.HitTest method and return instance of CustomAxisInfo with value for index property. To get index you can use next code:
var pixelCoordinate = IsHorizontalAxis ? atPoint.X : atPoint.Y var index = GetCurrentCoordinateCalculator().GetDataValue(pixelCoordinate);
You need to change axis label tempate of modifier which you use.

There is forum thread which shows how to create and use custom axis info – Custom AxisLabelTemplate and LabelProvider.
Maybe it will be useful.

Hope it helps!

Yura Khariton answered 8 years ago

- chunxi
- 8 years ago
Many thanks Yura! I solved the problem.

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Hi there.

Do you have some screenshots which demonstates desired appearance of tooltip? As I understand you need to display index of renderable series in tooltip – in this case I would suggest to place index in DataSeries.SeriesName property.

By default RolloverModifier displays tooltip with SeriesName if it is set out of box. Please take a look on this example –
Real-Time with Cursors.

Also you could try to change tooltip template if you need some custom tooltip. Here is example where rollover has custom tooltip with SeriesName binding – Rollover Feedback.

Yura Khariton answered 8 years ago

- chunxi
- 8 years ago
Thanks Yura, But I don't know how to add the index to the text. Looks I need to change something here. Can you help me? <DataTemplate x:Key="ChartDataTemplate" DataType="s:SeriesInfo"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Margin="3,2,2,2" Style="{StaticResource ChartDataItemsStyle}" Text="{Binding SeriesName}"/> <TextBlock Grid.Column="1" Margin="0,2,2,2" Style="{StaticResource ChartDataItemsStyle}" Text=":"/> <TextBlock Grid.Column="2" Margin="3,2,20,2" Style="{StaticResource ChartDataItemsStyle}" Text="{Binding Value, StringFormat=\{0:0.00000\}}" /> </Grid> </DataTemplate>
- chunxi
- 8 years ago
I want to show the index of the 'Value' in the current series

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alternatively, if we can show the index for the tooltip when mouse move over the X-Axis, Please see my attached pic.

Images