Step area Chart in Flutter Cartesian Charts (SfCartesianChart)
6 Oct 20236 minutes to read
To render a spline area chart, create an instance of StepAreaSeries, and add it to the series collection property of SfCartesianChart. The following properties can be used to customize the appearance of spline area chart.
-
color- changes the color of the series. -
opacity- controls the transparency of the chart series. -
width- changes the stroke width of the series.
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
child: SfCartesianChart(
primaryXAxis: DateTimeAxis(),
series: <CartesianSeries>[
StepAreaSeries<ChartData, DateTime>(
dataSource: chartData,
xValueMapper: (ChartData data, _) => data.x,
yValueMapper: (ChartData data, _) => data.y
),
StepAreaSeries<ChartData, DateTime>(
dataSource: chartData1,
xValueMapper: (ChartData data, _) => data.x,
yValueMapper: (ChartData data, _) => data.y
)
]
)
)
)
);
}
Dashed step area
The dashArray property of the StepAreaSeries is used to render spline area series with dashes. Odd value is considered as rendering size and even value is considered as gap.
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
child: SfCartesianChart(
primaryXAxis: DateTimeAxis(),
series: <CartesianSeries>[
StepAreaSeries<ChartData, DateTime>(
dataSource: chartData,
dashArray: <double>[5, 5],
xValueMapper: (ChartData data, _) => data.x,
yValueMapper: (ChartData data, _) => data.y
)
]
)
)
)
);
}