How to get information from Trackball in Xamarin Charts (SfChart)?

[Maria]

I use SfChart.Please help me.How to get information from trackball.

Trackball will be activated once you long-press anywhere on the chart area and when I move my finger the information in trackball changed.How can I get it?Because I want to write it in Label.Text

[Yuvaraj Palanisamy]

Hi Maria, 

 

Greetings from Syncfusion. 

 

We would like to let you know that you can get the trackball label text by using TrackballCreated event in SfChart as per the below code example. 

 

CodeSnippet: 

<chart:SfChart TrackballCreated="SfChart_TrackballCreated" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"> 

 

. . . 

 

</chart:SfChart> 

 

private void SfChart_TrackballCreated(object sender, ChartTrackballCreatedEventArgs e) 

{ 

    foreach(var trackballInfo in e.ChartPointsInfo) 

    { 

        // Get or set the trackball label text 

        var trackballLabelText = trackballInfo.Label; 

        trackballInfo.Label += "%"; 

 

    } 

 

    rectangleAnnotation.X1 = (e.ChartPointsInfo[0] as ChartPointInfo).XPosition;       

    if (!rectangleAnnotation.IsVisible) 

    { 

        rectangleAnnotation.IsVisible = true; 

        var seriesBounds = (sender as SfChart).SeriesBounds; 

        rectangleAnnotation.Y1 = seriesBounds.Top; 

        rectangleAnnotation.Y2 = seriesBounds.Bottom; 

        rectangleAnnotation.X2 = seriesBounds.Right; 

    } 

} 

 

Also, we have attached the sample for your reference. Please find the sample from the below link. 

 

Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/ChartSample_Trackball_modified-637580766  

 

For more details, please refer the below link 

https://help.syncfusion.com/xamarin/charts/trackball#events  

 

Regards, 

Yuvaraj.