Series: Labels

• Aug 16, 2019
• 4 minutes to read

Labels can accompany series points to provide various additional information about them.

Use the setLabel method to customize settings specifying the content, position and appearance of series point labels. Note that series label settings depend on the series type.

The following table lists series and the corresponding label types:

Series type	Label type
PieSeries	PieSeriesLabel
DonutSeries	PieSeriesLabel
AreaSeries	MarkerSeriesLabel
StackedAreaSeries	MarkerSeriesLabel
FullStackedAreaSeries	MarkerSeriesLabel
StepAreaSeries	MarkerSeriesLabel
BarSeries	BarSeriesLabel
StackedBarSeries	StackedBarSeriesLabel
FullStackedBarSeries	StackedBarSeriesLabel
FullStackedBarSeries	StackedBarSeriesLabel
FullStackedBarSeries	StackedBarSeriesLabel
PointSeries	MarkerSeriesLabel
BubbleSeries	BubbleSeriesLabel
LineSeries	MarkerSeriesLabel
StepLineSeries	MarkerSeriesLabel
ScatterLineSeries	MarkerSeriesLabel
CandleStickSeries	FinancialSeriesLabel
StockSeries	FinancialSeriesLabel

This guide shows the main customization scenarios.

How to: Format series labels

The following code snippet demonstrates how to specify a Point series point label pattern:

Java

MarkerSeriesLabel label = new MarkerSeriesLabel();
label.setTextPattern("{A$tb}: {V$.0f}°C");
label.setVisible(true);
series.setLabel(label);

C#

MarkerSeriesLabel label = new MarkerSeriesLabel();
label.SetVisible(new Java.Lang.Boolean(true));
label.TextPattern = "{A$tb}: {V$.0f}°C";
series.Label = label;

The setTextPattern method allows you to modify label text for a series.

In the code above, series label placeholders (A and V) specify a series point value that should be added to a label. The following label placeholders are available:

Placeholder	Description
{S}	Displays a series name.
{A}	Displays a series point argument.
{L}	Displays a pie series point label.
{V}	Displays a series point value.
{VP}	Displays a series point value as percentages.
{W}	Displays a Bubble series point weight.
{O}	Displays a financial series point open value.
{H}	Displays a financial series point high value.
{L}	Displays a financial series point low value.
{C}	Displays a financial series point close value.

Note

These values can be formatted using default format strings after the $ sign. For example, in the {VP$#.##} string, VP is a placeholder, $ is a format string separator, and #.## is a format string.

How to: Use a series labels text provider

If you need extra customization, for example, to calculate values shown by a label, write code to develop a class that inherits the series label text provider interface:

Java

BarSeriesLabel label = new BarSeriesLabel();
label.setTextProvider(new BarSeriesLabelTextProvider());
series.setLabel(label);

// The series label text provider implementation.
private static class BarSeriesLabelTextProvider implements SeriesLabelTextProvider{
    private DecimalFormat mDecimalFormat = new DecimalFormat("#M");
    @Override
    public String getText(SeriesLabelValuesBase seriesLabelValues) {
        return mDecimalFormat.format(((SeriesLabelValues)seriesLabelValues).getValue()/1000000);
    }
}

C#

BarSeriesLabel label = new BarSeriesLabel();
label.TextProvider = new BarSeriesLabelTextProvider();
series.Label = label;

// The series label text provider implementation.
public class BarSeriesLabelTextProvider : Java.Lang.Object, ISeriesLabelTextProvider {
    private DecimalFormat decimalFormat = new DecimalFormat("#M");
    public string GetText(SeriesLabelValuesBase seriesLabelValues) {
        return decimalFormat.Format(((SeriesLabelValues)seriesLabelValues).Value / 1000000);
    }
}

Use the following symbols to implement a series label text provider:

Symbol	Description
SeriesLabelTextProvider	The interface that should be implemented by the class providing labels’ text for the SeriesBase class descendant object.
SeriesLabelTextProvider.getText(SeriesLabelValuesBase)	Formats the specified series label.
PieSeriesLabelValues	Provides values available to build a pie series’ label text.
SeriesLabelValues	Provides values available to build a common Cartesian series’ label text.
StackedSeriesLabelValues	Provides values available to build a stacked series’ label text.
FinancialSeriesLabelValues	Provides values that configure the financial series’s label text.

How to: Customize series labels’ appearance

You can customize labels’ appearance like any other chart elements’ appearance.

See this code snippet to learn how to change this label text’s appearance.

Java

PieSeriesLabel label = new PieSeriesLabel();
PieSeriesLabelStyle style = new PieSeriesLabelStyle()
TextStyle textStyle = new TextStyle();
pieSeries.setLabel(label);
label.setStyle(style);
style.setConnectorThickness(3f);
style.setTextStyle(textStyle);
textStyle.setColor(Color.BLACK);
textStyle.setSize(30.0f);
textStyle.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
textStyle.setPaintFlags(Paint.ANTI_ALIAS_FLAG );

C#

series.setLabel(new PieSeriesLabel() {
    Style = new PieSeriesLabelStyle() {
        ConnectorThickness = new Float(3.0);
        TextStyle = new TextStyle() {
            Color = new Integer(Color.Black);
            Size = new Float(30);
            Typeface = Typeface.DefaultFromStyle(TypefaceStyle.Bold);
            PaintFlags = new Integer((int)PaintFlags.AntiAlias);
        }
    }
});

Symbols that are used to customize a label’s text.

Symbol	Description
PieSeriesLabelStyle	Stores the Pie series label appearance settings.
SeriesLabelStyle	The storage of the series label appearance settings.
TextElementStyleBase.setTextStyle(TextStyle)	Specifies the chart element’s text style.
TextStyle	The text appearance parameters’ storage.