SmartLabelsStrategy: limit no. of labels to display

[Nitin Nitin]

Hi,

Using latest Telerik Q3 2013 dlls, I have implemented smart labels as followed

<telerik:RadCartesianChart.SmartLabelsStrategy>

            <telerik:ChartSmartLabelsStrategy />

        </telerik:RadCartesianChart.SmartLabelsStrategy>

 

and

 

 

        <telerik:RadCartesianChart.SeriesProvider>

            <telerik:ChartSeriesProvider Source="{Binding SeriesCollection,Mode=TwoWay}">

                <telerik:ChartSeriesProvider.SeriesDescriptors>

                    <telerik:CategoricalSeriesDescriptor ItemsSourcePath="Data" ValuePath="LineSeriesChartValue" CategoryPath="LineSeriesChartCategory">

                        <telerik:CategoricalSeriesDescriptor.Style>

                            <Style TargetType="telerik:LineSeries">

                                <Setter Property="CombineMode" Value="Cluster" />

                                <Setter Property="TrackBallInfoTemplate" Value="{Binding TrackballInfoTemplate, Mode=TwoWay}" />

                                <Setter Property="Stroke" Value="{Binding SeriesStroke, Mode=TwoWay}" />

                                <Setter Property="Tag" Value="{Binding SeriesName, Mode=TwoWay}" />

                                <Setter Property="VerticalAxis" Value="{Binding VerticalAxis, Mode=TwoWay}" />

                                <Setter Property="ShowLabels" Value="{Binding IsLabelEnabled, Mode=TwoWay}
" />

                            </Style>

                        </telerik:CategoricalSeriesDescriptor.Style>

                    </telerik:CategoricalSeriesDescriptor>

                </telerik:ChartSeriesProvider.SeriesDescriptors>

            </telerik:ChartSeriesProvider>

             

        </telerik:RadCartesianChart.SeriesProvider>

and in the viewmodel 

private void ShowMarkers(bool IsShowLabelEnabled)
{
   if(IsShowLabelEnabled)
   {
      IsLabelEnabled = true;
      xRadCartesianChart.SmartLabelsStrategy = new ChartSmartLabelsStrategy();
   }
}

1. The chart shows per minute datapoints starting from 6am to 6pm
2. The chart height and width is around 250 * 250.

Since the chart is smaller in height and width as per the design & as the series contains many datapoints, the labels are overlapping.

As the smart labels are not readable (PFA), we want a functionality where we can calculate the number of labels to be displayed depending upon the data points and zoomed/viewable chart

For eg: for a chart with 1000 datapoints should show only equally distanced 10 data point smart labels.

Please provide me a way to achieve the solution to the above requirement.

Thanks,
Nitin 

[Yavor]

Hello Nitin,

You can use LabelInterval property of the axis. Setting it to 5 for example will show every fifth label. Here is some code:

<telerik:CategoricalAxis LabelInterval="10" />

So for your scenario you can set it to 100.

Regards,
Yavor
Telerik

[Nitin Nitin]

Sorry it didnot fixed my problem.
Setting the LabelInterval property changed my y-axis labels.

I was looking for controlling the smartlabels count in the chart. (check attachment)

[Yavor]

Hi Nitin,

Smart labels are useful in scenarios where you have reasonable amount of labels and you want to adjust their positions to look better. In your scenarios you have a lot of labels in small area. Smart labels will try to adjust accordingly, but still it will be hard to tell which label corresponds to which point.

In your scenario I suggest that you use custom annotations that show only the labels that you want. This way you can have any number of labels that you want.

Regards,
Yavor
Telerik