相关疑难解决方法(0)

我想在颤振中绘制折线图。我遵循本教程，如果日期和月份不同，它可以正常工作。

但是为什么如果它只有一个日期和一个点，图表会变成这个？

代码

/// Timeseries chart example
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
        title: 'My app', // used by the OS task switcher
        theme: ThemeData(
          accentIconTheme: const IconThemeData.fallback().copyWith(
            color: Colors.white,
          ),
          primaryTextTheme: TextTheme(title: TextStyle(color: Colors.white)),
          primarySwatch: Colors.orange,
          primaryIconTheme: const IconThemeData.fallback().copyWith(
            color: Colors.white,
          ),
        ),
        home: SimpleTimeSeriesChart()),
  );
}

class SimpleTimeSeriesChart extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    var seriesList = List<Data>();

    seriesList.add(Data(DateTime(2020, 03, 12), int.parse("50")));

    return Scaffold(
        appBar: AppBar(
          title: Text("Graph"),
        ), …