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FL Chart is a highly customizable chart library in Flutter that offers a variety of chart options such as Line Chart, Bar Chart, Pie Chart, Scatter Chart, and Radar Chart. It also provides properties like touchCallback, touchTooltipData, and getTouchedSpotIndicator for easy customization. The chart's state can be changed with animation duration and curve controls. LineChart is a good choice for showing trends over time and distribution of data. To render a line chart, one can create an instance of LineSeries and add it to the series collection of SfCartesianChart. A step-by-step guide is available for building these charts in Flutter and exploring nested graphs.

To change the indicator in the fl_chart LineChart in Flutter, you can follow these steps:

Define a custom text style and color for the indicator:

final FlDotData customDotData = FlDotData(show: true, getDotPainter: (spot, percent, barData, index) {
  if (index == 0) {
    return FlDotCirclePainter(
      radius: 8,
      color: Colors.red,
      strokeWidth: 2,
      strokeColor: Colors.black,
    );
  } else {
    return FlDotCirclePainter(
      radius: 4,
      color: Colors.green,
      strokeWidth: 2,
      strokeColor: Colors.black,
    );
  }
});

Use the custom indicator in the LineChart:

LineChart(
  LineChartData(
    // Other properties
    lineBarsData: [
      LineChartBarData(
        // Other properties
        dotData: customDotData,
      ),
    ],
  ),
),

By using the FlDotData constructor and providing a custom dot painter, you can change the indicator appearance for the LineChart. You can further customize the indicator based on your specific requirements.

If you have further questions or need additional assistance, feel free to ask!

Sources

How to change color of this floating element in LineChart (fl_chart)? - Stack Overflow Line Chart: Always show tooltip and spot after a click · Issue #118 · imaNNeo/fl_chart fl_chart/repo_files/documentations/line_chart.md at master - GitHub Build beautiful charts in Flutter with FL Chart - LogRocket Blog fl_chart library - Dart API LineTouchTooltipData class - fl_chart library - Dart API - Pub.dev

dart - How to add this type of Indicator in fl_chart Flutter ...

LineChart TooltipLine does not display the correct color · Issue ...

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