Data label in SfPyramid Charts

Data label can be added to a chart series by enabling the isVisible option in the dataLabelSettings. You can use the following properties to customize the appearance.

• color – used to change the background color of the data label shape.
• borderWidth – used to change the stroke width of the data label shape.
• borderColor – used to change the stroke color of the data label shape.
• alignment - aligns the data label text to near, center and far.
• textStyle – used to change the data label text color, size, font family, font style, and font weight.
• color – used to change the color of the data label.
• fontFamily - used to change the font family for the data label.
• fontStyle - used to change the font style for the data label.
• fontWeight - used to change the font weight for the data label.
• fontSize - used to change the font size for the data label.
• margin - used to change the margin size for data labels.
• opacity - used to control the transparency of the data label.
• labelAlignment - used to align the Pyramid data label positions. The available options to customize the positions are outer, auto, top, bottom and middle.
• borderRadius - used to add the rounded corners to the data label shape.
• angle - used to rotate the labels.

dart

@override
    Widget build(BuildContext context) {
        return Scaffold(
            body: Center(
                child: Container(
                    child: SfPyramidChart(
                        series: PyramidSeries<SalesData, String>(
                                dataSource: chartData,
                                pointColorMapper: (SalesData data, _) => data.color,
                                xValueMapper: (SalesData data, _) => data.x,
                                yValueMapper: (SalesData data, _) => data.y,
                                dataLabelSettings: DataLabelSettings(
                                    // Renders the data label
                                    isVisible: true
                                )
                            )
                    )
                )
            )
        );
    }

Label position

The labelAlignment property is used to position the Pyramid chart type data labels at top, bottom, auto, outer and middle position of the actual data point position. By default, labels are auto positioned. You can move the labels horizontally and vertically using OffsetX and OffsetY properties respectively.

The labelPosition property is used to place the Pyramid series data labels either inside or outside. By default the label of Pyramid chart is placed inside the series.

dart

@override
    Widget build(BuildContext context) {
        return Scaffold(
            body: Center(
                child: Container(
                    child: SfPyramidChart(
                        series: PyramidSeries<SalesData, String>(
                                dataSource: chartData,
                                xValueMapper: (SalesData data, _) => data.x,
                                yValueMapper: (SalesData data, _) => data.y,
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    // Positioning the data label
                                    labelPosition: ChartDataLabelPosition.outside
                                )
                            )
                    )
                )
            )
        );
    }

NOTE

The labelAlignment property is used to position the Pyramid chart labels whereas labelPosition property is used to position the Pyramid chart labels.

Apply series color

The useSeriesColor property is used to apply the series color to background color of the data labels. The default value of this property is false.

dart

@override
    Widget build(BuildContext context) {
        return Scaffold(
            body: Center(
                child: Container(
                    child: SfPyramidChart(
                        series: PyramidSeries<SalesData, String>(
                                dataSource: chartData,
                                xValueMapper: (SalesData data, _) => data.x,
                                yValueMapper: (SalesData data, _) => data.y,
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    // Positioning the data label
                                    labelPosition: ChartDataLabelPosition.outside,
                                    // Renders background rectangle and fills it with series color
                                    useSeriesColor: true
                                )
                            )
                    )
                )
            )
        );
    }

Label template

You can customize the appearance of the data label with your own template using the builder property of dataLabelSettings.

dart

@override
    Widget build(BuildContext context) {
        return Scaffold(
            body: Center(
                child: Container(
                    child: SfPyramidChart(
                        series: PyramidSeries<SalesData, String>(
                                dataSource: chartData,
                                xValueMapper: (SalesData data, _) => data.x,
                                yValueMapper: (SalesData data, _) => data.y,
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    // Templating the data label
                                    builder: (dynamic data, dynamic point, dynamic series, int pointIndex, int seriesIndex) {
                                        return Container(
                                        height: 30,
                                        width: 30,
                                        child: Image.asset('images/livechart.png')
                                        );
                                    }
                                )
                            )
                    )
                )
            )
        );
    }