RadPieChart ItemSelections

[Afife Betül]

Requirements
RadControls version
.NET version
Visual Studio 2012
WPF
browser support	all browsers supported by RadControls

Hello,

I need a PieChart and I am trying to use RadPieChart. But I want to select item that is slice of my PieChart. So, I can show my users that select to want item to change OffsetFromCenter Value.

Thank you for helping.

[Rosko]

Hello Afife Betül,

It is a bit hard for me to understand your exact inquiry, so I will offer you two options.

The first one, if you want to select one of the slices in runtime and it expands. You just need to add a selection behavior.

<telerik:RadPieChart x:Name="PieChart" Grid.Row="1">
            <telerik:PieSeries ValueBinding="Value" RadiusFactor="0.77">
            </telerik:PieSeries>
            <telerik:RadPieChart.Behaviors>
                <telerik:ChartSelectionBehavior SelectionChanged="ChartSelectionBehavior_SelectionChanged"/>
            </telerik:RadPieChart.Behaviors>
</telerik:RadPieChart>

The other one, I am thinking of is you want to have one of the slices expanded from the start. You can check how to achieve that in this online demo with source code.

Regards,
Rosko
Telerik

[kavosh]

Hi Afife

What you actually need is to use the event Rosko mentioned, but you have to add below code to the event handler to do what you need.

private void ChartSelectionBehavior_SelectionChanged(object sender, ChartSelectionChangedEventArgs e)
        {
            var selectedPoints = e.AddedPoints;
            if (selectedPoints.Count > 0)
            {
                PieDataPoint point = (PieDataPoint) selectedPoints[0];
                point.OffsetFromCenter = 0.1;
            }

            var otherPoints = e.RemovedPoints;
            if (otherPoints.Count > 0)
            {
                foreach (PieDataPoint otherPoint in otherPoints)
                {
                    otherPoint.OffsetFromCenter = 0;
                }
            }
        }

Regards,
Kavosh