How to hide/not show the label connector based on datapoint's value or property.

Environment

Product Version	2017.3.913 or later
Product	RadChartView for WPF

Description

Choose which label connectors are visible depending on the datapoint.

Solution

Define a custom series and override its GetLabelConnector method. The following examples demonstrate how to create a custom ScatterLineSeries and hide the label connector of all points with XValue of 1.

C#

	public class CustomScatterLineSeries : ScatterLineSeries
    {
        protected override List<Point> GetLabelConnector(ChartSeriesLabelPositionInfo info)
        {
            //info.DataPoint.DataItem will contain the bound object in a data binding scenario

            var dataPoint = info.DataPoint as ScatterDataPoint;

            if (dataPoint != null && dataPoint.XValue == 1)
            {
                return new List<Point>() { new Point(), new Point() };
            }

            return base.GetLabelConnector(info);
        }
    }

C#

	<Grid>
        <Grid.Resources>
            <telerik:ChartSeriesLabelConnectorsSettings x:Key="LabelConnectorSettings" />
        </Grid.Resources>
		<telerik:RadCartesianChart>
			<telerik:RadCartesianChart.HorizontalAxis>
				<telerik:LinearAxis/>
			</telerik:RadCartesianChart.HorizontalAxis>

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

            <local:CustomScatterLineSeries ShowLabels="True" LabelConnectorsSettings="{StaticResource LabelConnectorSettings}" >
                <local:CustomScatterLineSeries.DataPoints>
					<telerik:ScatterDataPoint XValue="1" YValue="2"/>
					<telerik:ScatterDataPoint XValue="2" YValue="3"/>
					<telerik:ScatterDataPoint XValue="4" YValue="5"/>
					<telerik:ScatterDataPoint XValue="5" YValue="6"/>
					<telerik:ScatterDataPoint XValue="7" YValue="8"/>
				</local:CustomScatterLineSeries.DataPoints>
			</local:CustomScatterLineSeries>
		</telerik:RadCartesianChart>
	</Grid>

Figure 1: Custom ScatterLineSeries with one hidden label connector

See Also

• Label Connectors