Flutter实战 -- fl_chart(条形图)

import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
 
class BarChartSample1 extends StatefulWidget {
  @override
  _BarChartSample1State createState() => _BarChartSample1State();
}
 
class _BarChartSample1State extends State<BarChartSample1> {
  List<BarChartGroupData> rawBarData = [
    BarChartGroupData(x: 0, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 1, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 2, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 3, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 4, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 5, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 6, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 7, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 8, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
    BarChartGroupData(x: 9, barRods: [
      BarChartRodData(
        y: 8,
        colors: [const Color(0xff04dbff)],
        width: 16,
      ),
    ]),
  ];
 
  @override
  Widget build(BuildContext context) {
    return BarChart(
      BarChartData(
        groupsSpace: 10,
        barGroups: rawBarData,
        alignment: BarChartAlignment.center,
        barRods: [
          BarChartRodData(