Stacked area Chart in Flutter Cartesian Charts (SfCartesianChart)

11 Apr 202220 minutes to read

To create a Flutter stacked area chart quickly, you can check this video.

To render a stacked area chart, create an instance of StackedAreaSeries, and add it to the series collection property of SfCartesianChart. The following properties can be used to customize the appearance of stacked line series:

  • color - changes the color of the line.
  • opacity - controls the transparency of the chart series.
  • borderWidth - changes the stroke width of the series.
  • borderColor - changes the stroke color of the series.
@override
    Widget build(BuildContext context) {
         return Scaffold(
            body: Center(
                child: Container(
                    child: SfCartesianChart(
                        primaryXAxis: CategoryAxis(),
                        series: <ChartSeries>[
                            StackedAreaSeries<ChartData, String>(
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y1
                            ),
                            StackedAreaSeries<ChartData, String>(
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y2
                            ),
                            StackedAreaSeries<ChartData, String>(
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y3
                            ),
                        ]
                    )
                )   
            )
        );
    }

Stacked area

Grouping series

You can group and stack the similar stacked series types using the groupName property of stacked series. The stacked series that contains the same groupName will be stacked in a single group.

@override
    Widget build(BuildContext context) {
         return Scaffold(
            body: Center(
                child: Container(
                    child: SfCartesianChart(
                        primaryXAxis: CategoryAxis(),
                        series: <ChartSeries>[
                            StackedAreaSeries<ChartData, String>(
                                groupName: 'Group A',
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    useSeriesColor: true
                                ),
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y1
                            ),
                            StackedAreaSeries<ChartData, String>(
                                groupName: 'Group B',
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    useSeriesColor: true
                                ),
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y2
                            ),
                            StackedAreaSeries<ChartData, String>(
                                groupName: 'Group A',
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    useSeriesColor: true
                                ),
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y3
                            ),
                        ]
                    )
                )   
            )
        );
    }

Stacked area grouping

Display cumulative values

You can show the cumulative data label values using the showCumulativeValues property. If the series are grouped using groupName, then cumulative values will be shown based on grouping.

@override
    Widget build(BuildContext context) {
         return Scaffold(
            body: Center(
                child: Container(
                    child: SfCartesianChart(
                        primaryXAxis: CategoryAxis(),
                        series: <ChartSeries>[
                            StackedAreaSeries<ChartData, String>(
                                groupName: 'Group A',
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    showCumulativeValues: true,
                                    useSeriesColor: true
                                ),
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y1
                            ),
                            StackedAreaSeries<ChartData, String>(
                                groupName: 'Group B',
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    showCumulativeValues: true,
                                    useSeriesColor: true
                                ),
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y2
                            ),
                            StackedAreaSeries<ChartData, String>(
                                groupName: 'Group A',
                                dataLabelSettings: DataLabelSettings(
                                    isVisible: true,
                                    showCumulativeValues: true,
                                    useSeriesColor: true
                                ),
                                dataSource: chartData,
                                xValueMapper: (ChartData data, _) => data.x,
                                yValueMapper: (ChartData data, _) => data.y3
                            ),
                        ]
                    )
                )   
            )
        );
    }

Stacked area cumulative

See Also