Appearance customization in Flutter Funnel Chart (SfFunnelChart)

11 Apr 20226 minutes to read

Chart sizing

Chart renders based on the parent widget size. If you need the chart to be rendered in specific size, then set the size(width/height) to the parent widget.

@override
    Widget build(BuildContext context) {
        return Scaffold(
          body: SafeArea(
            child: Center(
            child: Container(
              height: 300,
              width: 350,
              child: SfFunnelChart()
            )
           )
          )
        );
    }

Chart margin

Margin to the chart can be specified using the margin property.

@override
      Widget build(BuildContext context) {
        List<ChartData> chartData = [
          ChartData('Jan', 35),
          ChartData('Feb', 28),
          ChartData('Mar', 38),
          ChartData('Apr', 32),
          ChartData('May', 40)
        ];
        return Scaffold(
          body: SafeArea(
            child: Center(
              child: Container(
                height: 300,
                width: 350,
                child: SfFunnelChart(
                  borderColor: Colors.red,
                  borderWidth: 2,
                  // Sets 15 logical pixels as margin for all the 4 sides.
                  margin: EdgeInsets.all(15)
                  ),
                  series: FunnelSeries<ChartData, String>(
                    dataSource: chartData,
                    xValueMapper: (ChartData data, _) => data.x,
                    yValueMapper: (ChartData data, _) => data.y,
                  )
                )
              )
            )
        );
      }

margin

Chart area customization

You can customize the area of the chart using the below properties.

@override
    Widget build(BuildContext context) {
      return Scaffold(
        body: SafeArea(
          child: Center(
            child: Container(
              height: 300, 
              width: 350, 
              child: SfFunnelChart(
                borderColor: Colors.red,
                borderWidth: 2,
                margin: EdgeInsets.all(15),
                backgroundColor: Colors.lightGreen,
                backgroundImage: const AssetImage('images/train.png'),
                series: FunnelSeries<ChartData, String>(
                dataSource: chartData,
                xValueMapper: (ChartData data, _) => data.x,
                yValueMapper: (ChartData data, _) => data.y,
              )
            )
          )
        )
      );
    }

margin