Step line Chart in Flutter Cartesian Charts (SfCartesianChart)
5 Oct 20237 minutes to read
To render a step line chart, create an instance of StepLineSeries, and add it to the series collection property of SfCartesianChart. The following properties can be used to customize the appearance of spline segment:
-
color- changes the color of the line. -
opacity- controls the transparency of the chart series. -
width- changes the stroke width of the line.
@override
Widget build(BuildContext context) {
final List<ChartData> chartData = [
ChartData(DateTime(2010), 32),
ChartData(DateTime(2011), 40),
ChartData(DateTime(2012), 34),
ChartData(DateTime(2013), 52),
ChartData(DateTime(2014), 42),
ChartData(DateTime(2015), 38),
ChartData(DateTime(2016), 41),
];
return Scaffold(
body: Center(
child: Container(
child: SfCartesianChart(
primaryXAxis: DateTimeAxis(),
series: <CartesianSeries>[
// Renders step line chart
StepLineSeries<ChartData, DateTime>(
dataSource: chartData,
xValueMapper: (ChartData data, _) => data.x,
yValueMapper: (ChartData data, _) => data.y
)
]
)
)
)
);
}
Dashed step line
The dashArray property of the StepLineSeries is used to render step line series with dashes. Odd value is considered as rendering size and even value is considered as gap.
@override
Widget build(BuildContext context) {
final List<ChartData> chartData = [
ChartData(DateTime(2010), 32),
ChartData(DateTime(2011), 40),
ChartData(DateTime(2012), 34),
ChartData(DateTime(2013), 52),
ChartData(DateTime(2014), 42),
ChartData(DateTime(2015), 38),
ChartData(DateTime(2016), 41),
];
return Scaffold(
body: Center(
child: Container(
child: SfCartesianChart(
primaryXAxis: DateTimeAxis(),
series: <CartesianSeries>[
StepLineSeries<ChartData, DateTime>(
dataSource: chartData,
// Dashes for step line
dashArray: <double>[5, 5],
xValueMapper: (ChartData data, _) => data.x,
yValueMapper: (ChartData data, _) => data.y
)
]
)
)
)
);
}