Methods in Flutter Funnel Chart

18 Nov 20182 minutes to read

PixelToPoint

Converts a logical pixel value to a data point value.

The pixelToPoint method takes a logical pixel value as input and returns a chart data point.

Note: The method returns the center value of the segment.

DART

// Initialize the series controller
    FunnelSeriesController? seriesController;

    @override
    Widget build(BuildContext context) {
      return Container(
        child: SfFunnelChart(
          onChartTouchInteractionDown: (ChartTouchInteractionArgs args) {
            final Offset value = Offset(args.position.dx, args.position.dy);
            final PointInfo<dynamic>? chartPoint = seriesController?.pixelToPoint(value);
            },
          series: FunnelSeries<ChartData, String>(
            dataSource: data,
            onRendererCreated: (FunnelSeriesController funnelSeriesController) {
              seriesController = funnelSeriesController;
            },
            xValueMapper: (ChartData data, _) => data.x,
            yValueMapper: (ChartData data, _) => data.y
          )
        ),
      );
    }

     class ChartData{
        ChartData(this.x, this.y);
        final String x;
        final double y;
      }