How to show only one ItemLabel in line series in radchart

[Dinesh]

I'm using radchart,in tht chart i'm able to show 4 series(binding by programmatically) and in that one of the series is line as the value will be same for each x axis value.Now i want to hide the all ItemLabel except one ItemLabel i.e showing the item label at last x axis value,is there any way to show only one ItemLabel for the series.

Thanks in Advance.

[Petar Marchev]

Hello Dinesh,

It seems that this flat line serves as an annotation. If this is the case, and it annotates some value (and it does not represent some data), then I will suggest that you use a line annotation to achieve this.

Greetings,
Petar Marchev
the Telerik team

[Dinesh]

Hi Petar,

Thanks for the reply,we doesn't find any annotations property in chart control and i have posted the picture as a sample that i need the value to be shown for the last point(x-axis value) of the line series,which is binding to the another y axis(right side). And that line will dynamically changes when we change the week.

Let me share some of the code below

       void SrcObj_RadChart1DataCompleted(object sender, RadChart1DataCompletedEventArgs e)
        {

           List<WebService.ChartData> objListAPS = new List<WebService.ChartData>();

            objListAPS = (List<WebService.ChartData>)e.Result.ToList();

 

            RadChart1.DefaultView.ChartArea.AdditionalYAxes.Clear();

            RadChart1.PaletteBrushes.Clear();

            RadChart1.SeriesMappings.Clear();

 

            AxisY axisY = new AxisY();

            axisY.AxisName = "AxisY2";

            axisY.Title = "";

            axisY.IsZeroBased = true;

            axisY.DefaultLabelFormat = "#VAL{P0}";

            RadChart1.DefaultView.ChartArea.AdditionalYAxes.Add(axisY);

 

            RadChart1.DefaultView.ChartArea.AxisY.DefaultLabelFormat = "#VAL{C0}";

 

            BarSeriesDefinition BarDefVTBUnits = new BarSeriesDefinition();

            BarSeriesDefinition BarDefYOYUnits = new BarSeriesDefinition();

 

            LineSeriesDefinition lineDefVTBUnits = new LineSeriesDefinition() { ShowPointMarks = false };

            LineSeriesDefinition lineDefYOYUnits = new LineSeriesDefinition() { ShowPointMarks = false};

 

            RadChart1.DefaultView.ChartLegend.Background = new SolidColorBrush(Color.FromArgb(255, 75, 119, 255));

 

            RadChart1.DefaultView.ChartArea.AxisY.StripLinesVisibility = Visibility.Collapsed;

            RadChart1.DefaultView.ChartArea.AxisY.MajorGridLinesVisibility = Visibility.Visible;

 

            RadChart1.DefaultView.ChartLegend.UseAutoGeneratedItems = true;

            RadChart1.DefaultView.ChartLegend.Header = "";

 

            RadChart1.DefaultView.ChartLegendPosition = Telerik.Windows.Controls.Dock.Bottom;

            RadChart1.DefaultView.ChartLegend.Foreground = new SolidColorBrush(Colors.White);

            RadChart1.DefaultView.ChartLegend.LegendItemStyle = new Style() { TargetType = typeof(ChartLegendItem) };

            RadChart1.DefaultView.ChartLegend.LegendItemStyle.Setters.Add(new Setter() { Property = Control.ForegroundProperty, Value = new SolidColorBrush(Colors.White) });

 

            RadChart1.AxisForeground = new SolidColorBrush(Colors.Black);

            RadChart1.AxisElementBrush = new SolidColorBrush(Colors. Black);

            RadChart1.BorderBrush = new SolidColorBrush(Color.FromArgb(255, 175, 149, 164));

            RadChart1.BorderThickness = new Thickness(1);

 

            SeriesMapping objSeriesMapping1 = new SeriesMapping();

 

            objSeriesMapping1.SeriesDefinition = BarDefVTBUnits;

            BarDefVTBUnits.LabelSettings.LabelDisplayMode = LabelDisplayMode.Inside;

 

            objSeriesMapping1.LegendLabel = "Actuals";

            objSeriesMapping1.SeriesDefinition = BarDefVTBUnits;

            objSeriesMapping1.SeriesDefinition.Appearance.Fill = new SolidColorBrush(Color.FromArgb(255, 70, 130, 180));

            objSeriesMapping1.ItemMappings.Add(new ItemMapping("ProductGroup", DataPointMember.XCategory));

            objSeriesMapping1.ItemMappings.Add(new ItemMapping("Actuals", DataPointMember.YValue));

 

            objSeriesMapping1.SeriesDefinition.ItemLabelFormat = "#Y{C0}";

 

            RadChart1.SeriesMappings.Add(objSeriesMapping1);

 

            SeriesMapping objSeriesMapping2 = new SeriesMapping();

            objSeriesMapping2.SeriesDefinition = BarDefYOYUnits;

 

            BarDefYOYUnits.LabelSettings.LabelDisplayMode = LabelDisplayMode.Inside;

 

            objSeriesMapping2.LegendLabel = "Forecast";

            objSeriesMapping2.SeriesDefinition = BarDefYOYUnits;

            objSeriesMapping2.SeriesDefinition.Appearance.Fill = new SolidColorBrush(Colors.Brown);

            objSeriesMapping2.ItemMappings.Add(new ItemMapping("ProductGroup", DataPointMember.XCategory));

            objSeriesMapping2.ItemMappings.Add(new ItemMapping("Budget", DataPointMember.YValue));

 

            objSeriesMapping2.SeriesDefinition.ItemLabelFormat = "#Y{C0}";

 

            RadChart1.SeriesMappings.Add(objSeriesMapping2);

 

            SeriesMapping objSeriesMapping3 = new SeriesMapping();

 

            objSeriesMapping3.SeriesDefinition = lineDefVTBUnits;

            BarDefVTBUnits.LabelSettings.LabelDisplayMode = LabelDisplayMode.Inside;

 

            objSeriesMapping3.LegendLabel = "Attained Forecast";

            objSeriesMapping3.SeriesDefinition.AxisName = "AxisY2";

            objSeriesMapping3.SeriesDefinition.Appearance.Fill = new SolidColorBrush(Color.FromArgb(255, 236, 182, 48));

            objSeriesMapping3.ItemMappings.Add(new ItemMapping("ProductGroup", DataPointMember.XCategory));

            objSeriesMapping3.ItemMappings.Add(new ItemMapping("SellInRatio", DataPointMember.YValue));

 

            objSeriesMapping3.SeriesDefinition.ItemLabelFormat = "#Y{P0}";

 

            RadChart1.SeriesMappings.Add(objSeriesMapping3);

 

            SeriesMapping objSeriesMapping4 = new SeriesMapping();

            objSeriesMapping4.SeriesDefinition = lineDefYOYUnits;

 

            BarDefYOYUnits.LabelSettings.LabelDisplayMode = LabelDisplayMode.Inside;

 

            objSeriesMapping4.LegendLabel = "Target Attain";

            objSeriesMapping4.SeriesDefinition.AxisName = "AxisY2";

            objSeriesMapping4.SeriesDefinition.Appearance.Fill = new SolidColorBrush(Color.FromArgb(255, 120, 193, 121));

            objSeriesMapping4.ItemMappings.Add(new ItemMapping("ProductGroup", DataPointMember.XCategory));

            objSeriesMapping4.ItemMappings.Add(new ItemMapping("TargetAttain", DataPointMember.YValue));

 

            objSeriesMapping4.SeriesDefinition.ItemLabelFormat = "#Y{P0}";

 

            RadChart1.SeriesMappings.Add(objSeriesMapping4);
       }

for the objSeriesMapping4 which is line series(dynamically changes) which we need is that the line should show point label for the last x-axis and remaining previous x-axis values the line point labels show be hidden or removed.I'm attaching a picture (i.e the line colored green and label values is 81%).

[Petar Marchev]

Hi Dinesh,

I have attached an example application in which only the last label of the line series is visible. This is not supported by the chart out-of-the-box, but you can easily work-around it by using the DataBound and LayoutUpdated events of the chart. 

All the best,
Petar Marchev
the Telerik team