mathtool/lib/tools/statistical_charts.dart

// tools/statistical_charts.dart
import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';

class StatisticalChartsPage extends StatefulWidget {
  @override
  _StatisticalChartsPageState createState() => _StatisticalChartsPageState();
}

class _StatisticalChartsPageState extends State<StatisticalChartsPage> {
  int _currentChartIndex = 0;
  final List<String> _chartTypes = ['条形图', '折线图', '饼图', '雷达图'];
  
  // 数据控制器
  final List<TextEditingController> _dataControllers = [];
  final List<TextEditingController> _labelControllers = [];
  
  // 图表数据
  List<double> _dataValues = [];
  List<String> _dataLabels = [];
  
  @override
  void initState() {
    super.initState();
    // 初始化默认数据
    _initializeDefaultData();
  }
  
  void _initializeDefaultData() {
    // 清空现有控制器
    _dataControllers.clear();
    _labelControllers.clear();
    
    // 添加默认数据
    for (int i = 0; i < 5; i++) {
      _dataControllers.add(TextEditingController(text: '${(i + 1) * 10}'));
      _labelControllers.add(TextEditingController(text: '数据${i + 1}'));
    }
    
    _updateChartData();
  }
  
  void _updateChartData() {
    setState(() {
      _dataValues = [];
      _dataLabels = [];
      
      for (int i = 0; i < _dataControllers.length; i++) {
        if (_dataControllers[i].text.isNotEmpty && 
            _labelControllers[i].text.isNotEmpty) {
          try {
            double value = double.parse(_dataControllers[i].text);
            _dataValues.add(value);
            _dataLabels.add(_labelControllers[i].text);
          } catch (e) {
            // 忽略无效数据
          }
        }
      }
    });
  }
  
  void _addDataField() {
    setState(() {
      _dataControllers.add(TextEditingController(text: '0'));
      _labelControllers.add(TextEditingController(text: '新数据'));
    });
  }
  
  void _removeDataField(int index) {
    if (_dataControllers.length > 1) {
      setState(() {
        _dataControllers.removeAt(index);
        _labelControllers.removeAt(index);
        _updateChartData();
      });
    }
  }
  
  Widget _buildDataInputPanel() {
    return Card(
      elevation: 4,
      margin: EdgeInsets.all(16),
      child: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              '数据输入',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 16),
            Row(
              children: [
                Expanded(
                  flex: 2,
                  child: Text(
                    '标签',
                    style: TextStyle(fontWeight: FontWeight.bold),
                    textAlign: TextAlign.center,
                  ),
                ),
                SizedBox(width: 16),
                Expanded(
                  flex: 2,
                  child: Text(
                    '数值',
                    style: TextStyle(fontWeight: FontWeight.bold),
                    textAlign: TextAlign.center,
                  ),
                ),
                SizedBox(width: 16),
                Expanded(
                  flex: 1,
                  child: Text(
                    '操作',
                    style: TextStyle(fontWeight: FontWeight.bold),
                    textAlign: TextAlign.center,
                  ),
                ),
              ],
            ),
            SizedBox(height: 8),
            ...List.generate(_dataControllers.length, (index) {
              return Padding(
                padding: EdgeInsets.symmetric(vertical: 8),
                child: Row(
                  children: [
                    Expanded(
                      flex: 2,
                      child: TextField(
                        controller: _labelControllers[index],
                        decoration: InputDecoration(
                          hintText: '输入标签',
                          border: OutlineInputBorder(),
                          contentPadding: EdgeInsets.symmetric(horizontal: 12),
                        ),
                        onChanged: (value) => _updateChartData(),
                      ),
                    ),
                    SizedBox(width: 16),
                    Expanded(
                      flex: 2,
                      child: TextField(
                        controller: _dataControllers[index],
                        decoration: InputDecoration(
                          hintText: '输入数值',
                          border: OutlineInputBorder(),
                          contentPadding: EdgeInsets.symmetric(horizontal: 12),
                        ),
                        keyboardType: TextInputType.number,
                        onChanged: (value) => _updateChartData(),
                      ),
                    ),
                    SizedBox(width: 16),
                    Expanded(
                      flex: 1,
                      child: IconButton(
                        icon: Icon(Icons.delete, color: Colors.red),
                        onPressed: () => _removeDataField(index),
                      ),
                    ),
                  ],
                ),
              );
            }),
            SizedBox(height: 16),
            Row(
              children: [
                ElevatedButton(
                  onPressed: _addDataField,
                  child: Text('添加数据'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.blue,
                    foregroundColor: Colors.white,
                  ),
                ),
                SizedBox(width: 16),
                ElevatedButton(
                  onPressed: _initializeDefaultData,
                  child: Text('重置数据'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.grey,
                    foregroundColor: Colors.white,
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
  
  Widget _buildChartTypeSelector() {
    return Card(
      elevation: 4,
      margin: EdgeInsets.symmetric(horizontal: 16),
      child: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              '图表类型',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 12),
            Wrap(
              spacing: 8,
              runSpacing: 8,
              children: List.generate(_chartTypes.length, (index) {
                return ChoiceChip(
                  label: Text(_chartTypes[index]),
                  selected: _currentChartIndex == index,
                  onSelected: (selected) {
                    setState(() {
                      _currentChartIndex = index;
                    });
                  },
                  selectedColor: Colors.blue,
                  labelStyle: TextStyle(
                    color: _currentChartIndex == index ? Colors.white : Colors.black,
                  ),
                );
              }),
            ),
          ],
        ),
      ),
    );
  }
  
  Widget _buildChart() {
    if (_dataValues.isEmpty) {
      return Container(
        height: 300,
        child: Center(
          child: Text(
            '请输入有效数据',
            style: TextStyle(fontSize: 18, color: Colors.grey),
          ),
        ),
      );
    }
    
    switch (_currentChartIndex) {
      case 0: // 条形图
        return _buildBarChart();
      case 1: // 折线图
        return _buildLineChart();
      case 2: // 饼图
        return _buildPieChart();
      case 3: // 雷达图
        return _buildRadarChart();
      default:
        return _buildBarChart();
    }
  }
  
  Widget _buildBarChart() {
    return Card(
      elevation: 4,
      margin: EdgeInsets.all(16),
      child: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          children: [
            Text(
              '条形图',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 16),
            Container(
              height: 300,
              child: BarChart(
                BarChartData(
                  alignment: BarChartAlignment.spaceAround,
                  maxY: _dataValues.isEmpty ? 100 : _dataValues.reduce((a, b) => a > b ? a : b) * 1.2,
                  barTouchData: BarTouchData(
                    enabled: true,
                    // 简化 tooltip 配置
                    touchTooltipData: BarTouchTooltipData(),
                  ),
                  titlesData: FlTitlesData(
                    show: true,
                    bottomTitles: AxisTitles(
                      sideTitles: SideTitles(
                        showTitles: true,
                        getTitlesWidget: (value, meta) {
                          int index = value.toInt();
                          if (index >= 0 && index < _dataLabels.length) {
                            return Padding(
                              padding: const EdgeInsets.only(top: 8.0),
                              child: Text(
                                _dataLabels[index],
                                style: TextStyle(fontSize: 10),
                                maxLines: 2,
                                overflow: TextOverflow.ellipsis,
                              ),
                            );
                          }
                          return Text('');
                        },
                      ),
                    ),
                    leftTitles: AxisTitles(
                      sideTitles: SideTitles(
                        showTitles: true,
                        reservedSize: 40,
                      ),
                    ),
                  ),
                  gridData: FlGridData(show: true),
                  borderData: FlBorderData(show: true),
                  barGroups: List.generate(_dataValues.length, (index) {
                    return BarChartGroupData(
                      x: index,
                      barRods: [
                        BarChartRodData(
                          toY: _dataValues[index],
                          color: Colors.primaries[index % Colors.primaries.length],
                          width: 16,
                        ),
                      ],
                    );
                  }),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
  
 // 在类顶部添加曲线类型状态变量
bool _isLineCurved = true;

Widget _buildLineChart() {
  return Card(
    elevation: 4,
    margin: EdgeInsets.all(16),
    child: Padding(
      padding: EdgeInsets.all(16),
      child: Column(
        children: [
          Text(
            '折线图',
            style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
          ),
          SizedBox(height: 16),
          
          // 添加曲线类型选择器
          Container(
            padding: EdgeInsets.symmetric(horizontal: 16),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  '曲线类型:',
                  style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500),
                ),
                Row(
                  children: [
                    ChoiceChip(
                      label: Text('直线'),
                      selected: !_isLineCurved,
                      onSelected: (selected) {
                        setState(() {
                          _isLineCurved = false;
                        });
                      },
                      selectedColor: Colors.blue,
                      labelStyle: TextStyle(
                        color: !_isLineCurved ? Colors.white : Colors.black,
                      ),
                    ),
                    SizedBox(width: 8),
                    ChoiceChip(
                      label: Text('光滑曲线'),
                      selected: _isLineCurved,
                      onSelected: (selected) {
                        setState(() {
                          _isLineCurved = true;
                        });
                      },
                      selectedColor: Colors.blue,
                      labelStyle: TextStyle(
                        color: _isLineCurved ? Colors.white : Colors.black,
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
          SizedBox(height: 16),
          
          Container(
            height: 300,
            child: LineChart(
              LineChartData(
                lineTouchData: LineTouchData(enabled: true),
                gridData: FlGridData(show: true),
                titlesData: FlTitlesData(
                  show: true,
                  bottomTitles: AxisTitles(
                    sideTitles: SideTitles(
                      showTitles: true,
                      getTitlesWidget: (value, meta) {
                        int index = value.toInt();
                        if (index >= 0 && index < _dataLabels.length) {
                          return Padding(
                            padding: const EdgeInsets.only(top: 8.0),
                            child: Text(
                              _dataLabels[index],
                              style: TextStyle(fontSize: 10),
                            ),
                          );
                        }
                        return Text('');
                      },
                    ),
                  ),
                  leftTitles: AxisTitles(
                    sideTitles: SideTitles(
                      showTitles: true,
                      reservedSize: 40,
                    ),
                  ),
                ),
                borderData: FlBorderData(show: true),
                minX: 0,
                maxX: _dataValues.length > 0 ? (_dataValues.length - 1).toDouble() : 1,
                minY: 0,
                maxY: _dataValues.isEmpty ? 100 : _dataValues.reduce((a, b) => a > b ? a : b) * 1.2,
                lineBarsData: [
                  LineChartBarData(
                    spots: List.generate(_dataValues.length, (index) {
                      return FlSpot(index.toDouble(), _dataValues[index]);
                    }),
                    isCurved: _isLineCurved,
                    color: Colors.blue,
                    barWidth: 4,
                    belowBarData: BarAreaData(show: false),
                    dotData: FlDotData(
                      show: true,
                      getDotPainter: (spot, percent, barData, index) {
                        return FlDotCirclePainter(
                          radius: 4,
                          color: Colors.blue,
                          strokeWidth: 2,
                          strokeColor: Colors.white,
                        );
                      },
                    ),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    ),
  );
}
  
  Widget _buildPieChart() {
    double total = _dataValues.fold(0, (a, b) => a + b);
    
    return Card(
      elevation: 4,
      margin: EdgeInsets.all(16),
      child: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          children: [
            Text(
              '饼图',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 16),
            Container(
              height: 300,
              child: Row(
                children: [
                  Expanded(
                    flex: 2,
                    child: PieChart(
                      PieChartData(
                        sectionsSpace: 4,
                        centerSpaceRadius: 40,
                        sections: List.generate(_dataValues.length, (index) {
                          return PieChartSectionData(
                            color: Colors.primaries[index % Colors.primaries.length],
                            value: _dataValues[index],
                            title: '${(_dataValues[index] / total * 100).toStringAsFixed(1)}%',
                            radius: 50,
                            titleStyle: TextStyle(
                              fontSize: 12,
                              fontWeight: FontWeight.bold,
                              color: Colors.white,
                            ),
                          );
                        }),
                      ),
                    ),
                  ),
                  Expanded(
                    flex: 1,
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: List.generate(_dataValues.length, (index) {
                        return Padding(
                          padding: EdgeInsets.symmetric(vertical: 4),
                          child: Row(
                            children: [
                              Container(
                                width: 12,
                                height: 12,
                                color: Colors.primaries[index % Colors.primaries.length],
                              ),
                              SizedBox(width: 8),
                              Flexible(
                                child: Text(
                                  _dataLabels[index],
                                  style: TextStyle(fontSize: 12),
                                  overflow: TextOverflow.ellipsis,
                                ),
                              ),
                            ],
                          ),
                        );
                      }),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
  
  Widget _buildRadarChart() {
  if (_dataValues.length < 3) {
    return Card(
      elevation: 4,
      margin: EdgeInsets.all(16),
      child: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          children: [
            Text(
              '雷达图',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 16),
            Container(
              height: 300,
              child: Center(
                child: Text(
                  '雷达图需要至少3个数据点\n请添加更多数据',
                  textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 16, color: Colors.grey),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  return Card(
    elevation: 4,
    margin: EdgeInsets.all(16),
    child: Padding(
      padding: EdgeInsets.all(16),
      child: Column(
        children: [
          Text(
            '雷达图',
            style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
          ),
          SizedBox(height: 16),
          Container(
            height: 300,
            child: RadarChart(
              RadarChartData(
                dataSets: [
                  RadarDataSet(
                    dataEntries: List.generate(_dataValues.length, (index) {
                      return RadarEntry(
                        value: _dataValues[index],
                      );
                    }),
                    fillColor: Colors.blue.withOpacity(0.3),
                    borderColor: Colors.blue,
                    borderWidth: 2,
                  ),
                ],
                radarBackgroundColor: Colors.transparent,
                radarBorderData: BorderSide(color: Colors.grey, width: 1),
                tickBorderData: BorderSide(color: Colors.grey, width: 1),
                gridBorderData: BorderSide(color: Colors.grey, width: 1),
                ticksTextStyle: TextStyle(color: Colors.black, fontSize: 10),
                tickCount: 5,
                getTitle: (index, angle) {
                  if (index >= 0 && index < _dataLabels.length) {
                    return RadarChartTitle(
                      text: _dataLabels[index],
                      angle: angle,
                    );
                  }
                  return RadarChartTitle(text: '');
                },
                titleTextStyle: TextStyle(
                  color: Colors.black,
                  fontSize: 12,
                  fontWeight: FontWeight.bold,
                ),
                titlePositionPercentageOffset: 0.15,
              ),
              swapAnimationDuration: Duration(milliseconds: 500),
              swapAnimationCurve: Curves.easeInOut,
            ),
          ),
          SizedBox(height: 16),
          Container(
            height: 20,
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Container(
                  width: 12,
                  height: 12,
                  decoration: BoxDecoration(
                    color: Colors.blue.withOpacity(0.3),
                    border: Border.all(color: Colors.blue, width: 2),
                  ),
                ),
                SizedBox(width: 8),
                Text(
                  '数据分布',
                  style: TextStyle(fontSize: 12, color: Colors.grey),
                ),
              ],
            ),
          ),
        ],
      ),
    ),
  );
}
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('统计图表绘制', style: TextStyle(color: Colors.black)),
        backgroundColor: Colors.white,
        elevation: 1,
      ),
      body: SingleChildScrollView(
        child: Column(
          children: [
            _buildChartTypeSelector(),
            _buildDataInputPanel(),
            _buildChart(),
          ],
        ),
      ),
    );
  }
  
  @override
  void dispose() {
    // 清理控制器
    for (var controller in _dataControllers) {
      controller.dispose();
    }
    for (var controller in _labelControllers) {
      controller.dispose();
    }
    super.dispose();
  }
}