绘制：
1.在pubspec.yaml中引入：fl_chart: 0.55.2
2.绘制：

import 'package:jade/utils/JadeColors.dart';
import 'package:util/easy_loading_util.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';

class MyLineChart extends StatefulWidget {
   
  const MyLineChart({
   Key key}) : super(key: key);

  @override
  State<MyLineChart> createState() => _MyLineChartState();
}

class _MyLineChartState extends State<MyLineChart> {
   
  List<Color> gradientColors = [
    Colors.yellow,
    Colors.yellow,
  ];

  //进入后默认显示指示竖线和轨迹球的点
  FlSpot _defaultShowFlSpot = FlSpot(8, 4);
  //进入页面时默认显示的点上的竖线显隐开关
  bool _showSpotLine = true;


  List<String> get weekDays => const ['10.21', '10.22', '10.23', '10.24', '10.25', '10.26', '10.27'];



  @override
  Widget build(BuildContext context) {
   
    return Container(
      child: Column(
        children: <Widget>[
          AspectRatio(
            aspectRatio: 1.70,
            child: Padding(
              padding: EdgeInsets.only(
                right: 40.w,
              ),
              child: LineChart(mainData())

            ),
          ),
        ],
      ),
    );
  }

  LineChartData mainData() {
   
    return LineChartData(
      //网格
      gridData: FlGridData(
        show: true,
        drawVerticalLine: false,
        horizontalInterval: 1,
        verticalInterval: 1,
        getDrawingHorizontalLine: (value) {
   
          return  FlLine(
            color: JadeColors.lightGrey,
            strokeWidth: 1,
          );
        },
        getDrawingVerticalLine: