ToolTip for LineSeries don't show

[Yang]

Hi,
   The SDK Tooltip example (Telerik xaml-sdk-master\ChartView\WPF\Tooltip) works fine. But if I change the series from bar to line,
the tooltip will not show again.

Only change one line:
   <telerik:BarSeries CategoryBinding="Quarter" ValueBinding="Profit" />
to:
   <telerik:LineSeries CategoryBinding="Quarter" ValueBinding="Profit" />

So, how can I show simple tooltip on LineSeries or ScatterLineSeries? 

Thanks.

[Martin Ivanov]

Hello Yang,

The tooltip behavior of the RadChartView suite depends on the series default visual element which describes its data points. Since the LineSeries doesn't have a default visual presenter for its points a tooltip is not displayed. The first note (the blue paragraph) in the Tooltip help article describes this.

In order to show a tooltip for the line series you can define a PointTemplate for the LineSeries. For example:

<telerik:LineSeries.PointTemplate>
    <DataTemplate>
        <Ellipse Width="20" Height="20" Fill="Red" />
    </DataTemplate>
 </telerik:LineSeries.PointTemplate>

I hope this information helps.

Regards,
Martin
Telerik

 

 

[Yang]

Thank you, Martin:

    The tooltip showed after define PointTemplate. 

Regards,
 Yang

[William]

Martin -

  I'm able to use the XAML you show for plots with a couple of series. How can I do the same thing in the C# for a plot with multiple series added by the user?

[Martin Ivanov]

Hello William,

You can define the DataTemplate in the main view or the application resources and get it from the Resource dictionary when the series is created. For example:

<Window.Resources>
    <DataTemplate x:Key="seriesPointTemplate">
        <Ellipse Width="20" Height="20" Fill="Red" />
    </DataTemplate>
</Window.Resources>

series.PointTemplate = (DataTemplate)this.Resources["seriesPointTemplate"];
// where 'this' is the Window object (for example the MainWindow)

Or you can create the DataTemplate in code, but this is a bit harder and hard to maintain. You can see how to do that in the following StackOverflow question.

Regards,
Martin
Telerik by Progress

[William]

Thank you. That did the trick.

[BHUKYA]

LineSeries lineSeries = new LineSeries();
                lineSeries.CategoryBinding = new PropertyNameDataPointBinding(XasisFeild);
                lineSeries.ValueBinding = new PropertyNameDataPointBinding(YaxisFeild);
                lineSeries.LegendSettings = new SeriesLegendSettings { Title = YaxisFeild };
                //lineSeries.ToolTip = YaxisFeild;
                lineSeries.ItemsSource = listOfDataToPlot;
                lineSeries.Stroke = SetLineSeriesColor(seriesCount);

                Rectangle rectangle = new Rectangle() { Height = 10, Width = 10 };
                Type type = rectangle.GetType();
                DataTemplate dataTemp = new DataTemplate(type);
               // dataTemp.DataType = type;

                lineSeries.PointTemplate = dataTemp;

return lineSeries;

This is how I'm getting line series and adding it to chart as a child. Still I'm not seeing my tooltip and I'm not able to select points on series. I wanted to select one or range of point based on selection. Doing this in code behind not in XAML. Plz help me with this.

 

[Martin Ivanov]

Hello Bhukya,

The tooltip will display only if you have a visuals for the data points. You can show this by setting PointTemplate or DefaultVisualStyle property of the series. You can see how to create a DataTemplate in code in the following blog post. Also, check the following stackoverflow topic for creating a Style in code.

Regards,
Martin Ivanov
Progress Telerik