flutter_habit/lib/view/context/widget/DateValueMultiLineChart.dart

import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
import 'package:flutter_habit/common/I18N.dart';
import 'package:flutter_habit/provider/ThemeProvider.dart';
import 'package:flutter_habit/common/utils/ConvertUtils.dart';
import 'package:provider/provider.dart';

class DateValueMultiLineChart extends StatelessWidget {
  final Map<String, List<FlSpot>> lineNameSportsMap;

  final int? size;

  DateValueMultiLineChart({
    required this.lineNameSportsMap,
    this.size,
  });

  List<LineChartBarData> getLineChartBarData(BuildContext context) {
    int i = 0;
    List<LineChartBarData> out = lineNameSportsMap.values.map((sports) {
      LineChartBarData lineChartBarData = LineChartBarData(
        spots: sports,
        // 圆滑
        isCurved: size! > 7,
        // 线条颜色
        color: 
          Provider.of<ThemeProvider>(context, listen: false).otherColors[i]
        ,
        // 线条宽度
        barWidth: 3,
        // 起点和终点是否圆滑
        isStrokeCapRound: true,
        // 点配置
        dotData: FlDotData(
          show: size! < 30,
          // getDotColor: (spot, percent, barData) =>
          //     Provider.of<ThemeProvider>(context, listen: false).otherColors[i],
          // dotSize: 3,
        ),
        belowBarData: BarAreaData(
          show: false,
          color: 
            Theme.of(context).colorScheme.secondary.withOpacity(0.1 / (i + 1))
          ,
        ),
      );
      i = (i + 1) % (themeColors.length - 1);
      return lineChartBarData;
    }).toList();
    return out;
  }

  @override
  Widget build(BuildContext context) {
    double? maxY, minY, maxX, minX, xInterval, yInterval;
    if (lineNameSportsMap.values.first.isNotEmpty) {
      double now =
          ConvertUtils.localDaysSinceEpoch(DateTime.now()).floorToDouble();
      maxX = now;
      minX = now - size!;
      maxY = lineNameSportsMap.values.first.first.y;
      minY = lineNameSportsMap.values.first.first.y;
      lineNameSportsMap.values.forEach((sports) {
        sports.forEach((i) {
          if (i.y < minY!) {
            minY = i.y;
          }
          if (i.y > maxY!) {
            maxY = i.y;
          }
        });
      });
      if (maxY == maxY) {
        maxY = maxY! + 10;
        minY = minY! - 10;
      } else {
        double height = maxY! - minY!;
        maxY = maxY! + height;
        minY = minY! - height;
      }
      switch (size) {
        case 7:
          xInterval = 1;
          break;
        case 30:
          xInterval = 5;
          break;
        case 90:
          xInterval = 18;
          break;
        default:
          xInterval = 1;
          break;
      }
      yInterval = ((maxY! - minY!) / 6);
    }
    int i = 0;
    return lineNameSportsMap.values.first.isEmpty
        ? Container(
            child: Column(
            children: <Widget>[
              Text(
                I18N.of("无数据"),
                style: Theme.of(context)
                    .textTheme
                    .displaySmall!
                    .copyWith(color: Theme.of(context).colorScheme.secondary),
              ),
              Divider(),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: <Widget>[
                  Text(
                    I18N.of("添加数据后会展示对应图表"),
                    style: Theme.of(context).textTheme.bodySmall,
                  ),
                ],
              ),
            ],
          ))
        : Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: lineNameSportsMap.keys.map((s) {
                  // 右显数据
                  Widget w = Text(
                    "$s —  ",
                    style: TextStyle(
                        color:
                            Provider.of<ThemeProvider>(context, listen: false)
                                .otherColors[i]),
                  );
                  i = (i + 1) % (themeColors.length - 1);
                  return w;
                }).toList(),
              ),
              Container(
                height: 250,
                padding: EdgeInsets.only(top: 20, left: 10, right: 20),
                child: LineChart(
                  LineChartData(
                    // clipToBorder: true,
                    // 边框信息
                    borderData: FlBorderData(
                      show: true,
                      border: Border.all(
                        color: Theme.of(context).colorScheme.secondary,
                        width: 1,
                      ),
                    ),
                    backgroundColor:
                        Theme.of(context)
                        .colorScheme
                        .secondary
                        .withOpacity(0.03),
                    gridData: FlGridData(
                      show: true,
                      drawVerticalLine: true,
                      drawHorizontalLine: false,
                      // 从左到右每隔几个整数数据画条竖线
                      verticalInterval: xInterval,
                      // 横向网格线
                      getDrawingHorizontalLine: (value) {
                        return FlLine(
                          color: Theme.of(context).colorScheme.secondary,
                          strokeWidth: 0.5,
                        );
                      },
                      horizontalInterval: yInterval,
                      // 纵向网格线
                      getDrawingVerticalLine: (value) {
                        return FlLine(
                          color: Theme.of(context).colorScheme.secondary,
                          strokeWidth: 1,
                        );
                      },
                    ),
                    // 点击响应信息
                    lineTouchData: LineTouchData(
                      touchTooltipData: LineTouchTooltipData(
                        tooltipBgColor: Theme.of(context)
                            .colorScheme
                            .secondary
                            .withOpacity(0.2)
                            .withAlpha(100),
                        fitInsideHorizontally: true,
                      ),
                    ),
                    titlesData: FlTitlesData(
                      show: true,
                      // 下方文字
                      bottomTitles: AxisTitles(
                        // 每隔几个显示一个底部标签
                        // interval: xInterval,
                        // showTitles: true,
                        // 文字与图表上边界距离
//          margin: 8,
                        // 文字预留空间
//          reservedSize: 22,
                        // textStyle: Theme.of(context).textTheme.bodyMedium,
                        // getTitles: (value) {
                        //   DateTime dateTime =
                        //       ConvertUtils.dateTimeOfLocalDaysSinceEpoch(value);
                        //   return "${dateTime.month}-${dateTime.day}";
                        // },
                      ),
                      leftTitles: AxisTitles(
                        // 每隔几个显示一个左侧标签
                        // interval: yInterval,
                        // showTitles: true,
                        // 文字与图表左边界距离
//          margin: 8,
                        // 文字预留空间
                        // reservedSize: ConvertUtils.fixedDouble(maxY, 1).toString().length * 6.5,
                        // textStyle: Theme.of(context).textTheme.bodyMedium,
                        // getTitles: (value) {
                        //   return ConvertUtils.fixedDouble(value, 1).toString();
                        // },
                      ),
                    ),
                    // 各轴显示的最值 (不设置则缩放)
                    minX: minX,
                    maxX: maxX,
                    maxY: maxY,
                    minY: minY,

                    // 数据
                    lineBarsData: getLineChartBarData(context),
                  ),
                ),
              )
            ],
          );
  }
}