interaction possible

[smartpcr]

• Can I select a series/item on chart and have it highlighted (different style)
• Any event such as selection changed?

[Giuseppe]

Hello Smartpcr,

The current BETA version supports multiple item selection only -- we will be extending the ChartSelectionBehavior with series selection and the ability to specify single item/series selection for the Q1 2012 official release.

Here is a sample code snippet that demonstrates how you can enable the chart selection:

• Add ChartSelectionBehavior instance to the RadCartesianChart.Behaviors collection.
• Define the desired selection color via custom ChartPalette and set it to the RadCartesianChart.SelectionPalette property.
• You can detect the selection actopn via the RadCartesianChart.SelectionChanged event.

<telerik:RadCartesianChart x:Name="RadChart1" Palette="Metro" SelectionChanged="RadChart1_SelectionChanged">
    <telerik:RadCartesianChart.Behaviors>
        <telerik:ChartSelectionBehavior />
    </telerik:RadCartesianChart.Behaviors>

    <telerik:RadCartesianChart.SelectionPalette>
        <telerik:ChartPalette>
            <telerik:ChartPalette.GlobalEntries>
                <telerik:PaletteEntry Fill="Red" />
            </telerik:ChartPalette.GlobalEntries>
        </telerik:ChartPalette>
    </telerik:RadCartesianChart.SelectionPalette>

    <telerik:BarSeries>
        <telerik:CategoricalDataPoint Value="1" />
        <telerik:CategoricalDataPoint Value="2" />
        <telerik:CategoricalDataPoint Value="6" />
        <telerik:CategoricalDataPoint Value="7" />
    </telerik:BarSeries>

    <telerik:RadCartesianChart.HorizontalAxis>
        <telerik:CategoricalAxis />
    </telerik:RadCartesianChart.HorizontalAxis>
    <telerik:RadCartesianChart.VerticalAxis>
        <telerik:LinearAxis />
    </telerik:RadCartesianChart.VerticalAxis>

    <telerik:RadCartesianChart.Grid>
        <telerik:CartesianChartGrid MajorLinesVisibility="Y" />
    </telerik:RadCartesianChart.Grid>
</telerik:RadCartesianChart>

All the best,
Giuseppe
the Telerik team

[SOFIE]

Hi Telerik,

I have been using the new chart engine and I must admit it is so much more simple than the previous one.

I have implemented the selection behavior and it works well, I can click on any of my bar and raise the selection event.

Nevertheless, I am trying now to find a way to select on of the bar (from my BarSeries) from code and not from mouse click anymore.

I tried to set the selectionPoints in the code manually without success.

Can you tell me how to select one single bar from code ?

Thanks !

[SOFIE]

Up ;)

[Giuseppe]

Hello Sofie,

RadChart.SelectionPoints is a read-only collection that is generally useful if you would like to use the chart selection in a different control (i.e. you will bind ListBox.ItemsSource to RadChart.SelectionPoints).

You can use the respective DataPoint.IsSelected boolean property to achieve the desired effect:

(RadChart1.Series[0] as BarSeries).DataPoints[2].IsSelected = true;

Hope this helps.


All the best,
Giuseppe
the Telerik team

[smartpcr]

Which future release support selection behavior on chart series? thanks!

[Giuseppe]

Hello Xiaodong,

Could you elaborate a bit more on the desired selection behavior -- if you are looking for series-wide selection e.g. for a LineSeries to highlight the whole polyline in a different color, unfortunately this functionality is not available yet.


All the best,
Giuseppe
the Telerik team