cristalyse 0.6.0

cristalyse: ^0.6.0 copied to clipboard

example/lib/main.dart

import 'dart:math' as math;

import 'package:cristalyse/cristalyse.dart';
import 'package:cristalyse_example/chart_theme.dart';
import 'package:flutter/material.dart';

import 'graphs/bar_chart.dart';
import 'graphs/dual_axis_chart.dart';
import 'graphs/grouped_bar.dart';
import 'graphs/horizontal_bar_chart.dart';
import 'graphs/interactive_scatter.dart';
import 'graphs/line_chart.dart';
import 'graphs/scatter_plot.dart';
import 'graphs/stacked_bar_chart.dart';

void main() {
  runApp(const CristalyseExampleApp());
}

class CristalyseExampleApp extends StatelessWidget {
  const CristalyseExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Cristalyse - Grammar of Graphics for Flutter',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        fontFamily: 'SF Pro Display',
        useMaterial3: true,
        colorScheme: ColorScheme.fromSeed(
          seedColor: const Color(0xFF2563EB),
          brightness: Brightness.light,
        ),
      ),
      darkTheme: ThemeData(
        fontFamily: 'SF Pro Display',
        useMaterial3: true,
        colorScheme: ColorScheme.fromSeed(
          seedColor: const Color(0xFF3B82F6),
          brightness: Brightness.dark,
        ),
      ),
      home: const ExampleHome(),
    );
  }
}

class ExampleHome extends StatefulWidget {
  const ExampleHome({super.key});

  @override
  State<ExampleHome> createState() => _ExampleHomeState();
}

class _ExampleHomeState extends State<ExampleHome>
    with TickerProviderStateMixin {
  late TabController _tabController;
  late AnimationController _fabAnimationController;
  late Animation<double> _fabAnimation;

  int _currentThemeIndex = 0;
  final _themes = [
    ChartTheme.defaultTheme(),
    ChartTheme.darkTheme(),
    ChartTheme.solarizedLightTheme(),
    ChartTheme.solarizedDarkTheme(),
  ];

  final _themeNames = ['Default', 'Dark', 'Solarized Light', 'Solarized Dark'];

  int _currentPaletteIndex = 0;
  final _colorPalettes = [
    ChartTheme.defaultTheme().colorPalette,
    const [
      Color(0xfff44336),
      Color(0xffe91e63),
      Color(0xff9c27b0),
      Color(0xff673ab7)
    ],
    const [
      Color(0xff2196f3),
      Color(0xff00bcd4),
      Color(0xff009688),
      Color(0xff4caf50)
    ],
    const [
      Color(0xffffb74d),
      Color(0xffff8a65),
      Color(0xffdce775),
      Color(0xffaed581)
    ],
  ];

  final _paletteNames = ['Default', 'Warm', 'Cool', 'Pastel'];

  double _sliderValue = 0.5;
  bool _showControls = false;

  late final List<Map<String, dynamic>> _scatterPlotData;
  late final List<Map<String, dynamic>> _lineChartData;
  late final List<Map<String, dynamic>> _barChartData;
  late final List<Map<String, dynamic>> _groupedBarData;
  late final List<Map<String, dynamic>> _horizontalBarData;
  late final List<Map<String, dynamic>> _stackedBarData;
  late final List<Map<String, dynamic>> _dualAxisData;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 8, vsync: this); // Updated to 8 tabs
    _fabAnimationController = AnimationController(
      duration: const Duration(milliseconds: 300),
      vsync: this,
    );
    _fabAnimation = Tween<double>(begin: 0, end: 1).animate(
      CurvedAnimation(
          parent: _fabAnimationController, curve: Curves.elasticOut),
    );

    _tabController.addListener(() {
      if (mounted) setState(() {});
    });

    _generateSampleData();
    _generateStackedBarData();
    _generateDualAxisData();
    _fabAnimationController.forward();
  }

  void _generateSampleData() {
    // More realistic scatter plot data - Sales Performance
    _scatterPlotData = List.generate(60, (i) {
      final x = i.toDouble();
      final baseY = 20 + x * 0.8 + math.sin(x * 0.1) * 15;
      final noise = (math.Random().nextDouble() - 0.5) * 12;
      final y = math.max(5, baseY + noise);
      final categories = ['Enterprise', 'SMB', 'Startup'];
      final category = categories[i % 3];
      final size = 1.0 + (y / 10).clamp(0, 8);
      return {'x': x, 'y': y, 'category': category, 'size': size};
    });

    // Realistic line chart - User Growth
    _lineChartData = List.generate(24, (i) {
      final x = i.toDouble();
      final baseGrowth = 50 + i * 3.2;
      final seasonal = math.sin(x * 0.5) * 8;
      final y = baseGrowth + seasonal + (math.Random().nextDouble() - 0.5) * 6;
      return {'x': x, 'y': y, 'category': 'Monthly Active Users (k)'};
    });

    // Realistic bar chart - Quarterly Revenue
    final quarters = ['Q1 2024', 'Q2 2024', 'Q3 2024', 'Q4 2024'];
    _barChartData = quarters.asMap().entries.map((entry) {
      final revenue = 120 + entry.key * 25 + math.Random().nextDouble() * 20;
      return {'quarter': entry.value, 'revenue': revenue};
    }).toList();

    // Realistic grouped bar data - Product Performance
    final products = ['Mobile App', 'Web Platform', 'API Services'];
    final groupedQuarters = ['Q1', 'Q2', 'Q3', 'Q4'];
    _groupedBarData = <Map<String, dynamic>>[];
    for (final quarter in groupedQuarters) {
      for (int i = 0; i < products.length; i++) {
        final baseRevenue = 30 + groupedQuarters.indexOf(quarter) * 8;
        final productMultiplier = [1.2, 0.9, 0.7][i];
        final revenue =
            baseRevenue * productMultiplier + math.Random().nextDouble() * 15;
        _groupedBarData.add({
          'quarter': quarter,
          'product': products[i],
          'revenue': revenue,
        });
      }
    }

    // Realistic horizontal bar data - Team Performance
    final departments = [
      'Engineering',
      'Product',
      'Sales',
      'Marketing',
      'Customer Success'
    ];
    _horizontalBarData = departments.asMap().entries.map((entry) {
      final multipliers = [1.0, 0.8, 0.9, 0.7, 0.6];
      final headcount = 25 + (entry.key * 8) + math.Random().nextDouble() * 12;
      return {
        'department': entry.value,
        'headcount': headcount * multipliers[entry.key]
      };
    }).toList();
  }

  void _generateDualAxisData() {
    // Realistic dual-axis data - Revenue vs Conversion Rate
    final months = [
      'Jan',
      'Feb',
      'Mar',
      'Apr',
      'May',
      'Jun',
      'Jul',
      'Aug',
      'Sep',
      'Oct',
      'Nov',
      'Dec'
    ];
    _dualAxisData = <Map<String, dynamic>>[];

    for (int i = 0; i < months.length; i++) {
      final month = months[i];

      // Revenue data (left Y-axis) - ranges from ~100k to ~200k
      final baseRevenue = 120 + i * 5; // Growing trend
      final seasonalRevenue = math.sin(i * 0.5) * 20; // Seasonal variation
      final revenue = baseRevenue +
          seasonalRevenue +
          (math.Random().nextDouble() - 0.5) * 15;

      // Conversion rate data (right Y-axis) - ranges from ~15% to ~25%
      final baseConversion = 18 + i * 0.3; // Slow improvement over time
      final seasonalConversion =
          math.cos(i * 0.4) * 3; // Different seasonal pattern
      final conversionRate = baseConversion +
          seasonalConversion +
          (math.Random().nextDouble() - 0.5) * 2;

      final dataPoint = {
        'month': month,
        'revenue': math.max(80.0, revenue), // Ensure positive revenue
        'conversion_rate': math.max(10.0,
            math.min(30.0, conversionRate)), // Keep conversion rate reasonable
      };

      _dualAxisData.add(dataPoint);
    }
  }

  void _generateStackedBarData() {
    // Realistic stacked bar data - Revenue by Category per Quarter
    final categories = ['Product Sales', 'Services', 'Subscriptions'];
    final quarters = ['Q1 2024', 'Q2 2024', 'Q3 2024', 'Q4 2024'];
    _stackedBarData = <Map<String, dynamic>>[];

    for (final quarter in quarters) {
      for (int i = 0; i < categories.length; i++) {
        final category = categories[i];
        // Different base values for each category to make stacking interesting
        final baseValues = [
          40.0,
          25.0,
          30.0
        ]; // Product Sales highest, Services middle, Subscriptions lowest
        final quarterMultiplier =
            quarters.indexOf(quarter) * 0.2 + 1.0; // Growth over quarters
        final categoryMultiplier =
            [1.0, 0.8, 1.2][i]; // Different growth rates per category

        final revenue = baseValues[i] * quarterMultiplier * categoryMultiplier +
            (math.Random().nextDouble() - 0.5) * 10; // Add some variance

        _stackedBarData.add({
          'quarter': quarter,
          'category': category,
          'revenue': math.max(5, revenue), // Ensure positive values
        });
      }
    }
  }

  @override
  void dispose() {
    _tabController.dispose();
    _fabAnimationController.dispose();
    super.dispose();
  }

  ChartTheme get currentTheme {
    final baseTheme = _themes[_currentThemeIndex];
    return baseTheme.copyWith(
      colorPalette: _colorPalettes[_currentPaletteIndex],
    );
  }

  String _getDisplayedValue() {
    final index = _tabController.index;
    switch (index) {
      case 0:
      case 1: // Both scatter plots (regular and interactive)
        final value = 2.0 + _sliderValue * 20.0;
        return 'Point Size: ${value.toStringAsFixed(1)}px';
      case 2:
        final value = 1.0 + _sliderValue * 9.0;
        return 'Line Width: ${value.toStringAsFixed(1)}px';
      case 3:
      case 4:
      case 5:
      case 6:
      case 7:
        final value = _sliderValue.clamp(0.1, 1.0);
        return 'Bar Width: ${(value * 100).toStringAsFixed(0)}%';
      default:
        return _sliderValue.toStringAsFixed(2);
    }
  }

  List<String> _getChartTitles() {
    return [
      'Sales Performance Analysis',
      'Interactive Sales Dashboard',
      'User Growth Trends',
      'Quarterly Revenue',
      'Product Performance by Quarter',
      'Team Size by Department',
      'Revenue Breakdown by Category',
      'Revenue vs Conversion Performance',
    ];
  }

  List<String> _getChartDescriptions() {
    return [
      'Enterprise clients show higher deal values with consistent growth patterns',
      'Hover and tap for detailed insights • Rich tooltips and custom interactions',
      'Steady monthly growth with seasonal variations in user acquisition',
      'Strong Q4 performance driven by holiday sales and new partnerships',
      'Mobile app leading growth, API services showing steady adoption',
      'Engineering team expansion supporting our product development goals',
      'Product sales continue to drive growth, with subscriptions showing strong momentum',
      'Revenue growth correlates with improved conversion optimization',
    ];
  }

  Widget _buildStatsCard(
      String title, String value, String change, Color color) {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.1),
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: color.withValues(alpha: 0.2)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            title,
            style: TextStyle(
              fontSize: 10,
              fontWeight: FontWeight.w500,
              color: Colors.grey[600],
            ),
          ),
          const SizedBox(height: 2),
          Text(
            value,
            style: TextStyle(
              fontSize: 16,
              fontWeight: FontWeight.bold,
              color: color,
            ),
          ),
          Text(
            change,
            style: TextStyle(
              fontSize: 9,
              color: Colors.green[600],
              fontWeight: FontWeight.w500,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildControlPanel() {
    return AnimatedContainer(
      duration: const Duration(milliseconds: 300),
      height: _showControls ? null : 0,
      child: _showControls
          ? Container(
              margin: const EdgeInsets.fromLTRB(16, 8, 16, 8),
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Theme.of(context).cardColor,
                borderRadius: BorderRadius.circular(12),
                boxShadow: [
                  BoxShadow(
                    color: Colors.black.withValues(alpha: 0.1),
                    blurRadius: 8,
                    offset: const Offset(0, 2),
                  ),
                ],
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      Icon(Icons.tune,
                          color: Theme.of(context).primaryColor, size: 18),
                      const SizedBox(width: 8),
                      Text(
                        'Chart Controls',
                        style: TextStyle(
                          fontSize: 14,
                          fontWeight: FontWeight.bold,
                          color: Theme.of(context).primaryColor,
                        ),
                      ),
                      const Spacer(),
                      IconButton(
                        onPressed: () => setState(() => _showControls = false),
                        icon: const Icon(Icons.keyboard_arrow_up),
                        iconSize: 18,
                        padding: EdgeInsets.zero,
                        constraints: const BoxConstraints(),
                      ),
                    ],
                  ),
                  const SizedBox(height: 12),
                  Row(
                    children: [
                      Expanded(
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Text(
                              _getDisplayedValue(),
                              style: TextStyle(
                                fontSize: 12,
                                fontWeight: FontWeight.w600,
                                color: Colors.grey[700],
                              ),
                            ),
                            SliderTheme(
                              data: const SliderThemeData(
                                trackHeight: 3,
                                thumbShape: RoundSliderThumbShape(
                                  enabledThumbRadius: 6,
                                ),
                                overlayShape: RoundSliderOverlayShape(
                                  overlayRadius: 12,
                                ),
                              ),
                              child: Slider(
                                value: _sliderValue,
                                min: 0.0,
                                max: 1.0,
                                divisions: 20,
                                onChanged: (value) =>
                                    setState(() => _sliderValue = value),
                              ),
                            ),
                          ],
                        ),
                      ),
                      const SizedBox(width: 20),
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            '${_themeNames[_currentThemeIndex]} • ${_paletteNames[_currentPaletteIndex]}',
                            style: TextStyle(
                              fontSize: 12,
                              fontWeight: FontWeight.w600,
                              color: Colors.grey[700],
                            ),
                          ),
                          const SizedBox(height: 6),
                          Row(
                            children: _colorPalettes[_currentPaletteIndex]
                                .take(4)
                                .map((color) => Container(
                                      width: 16,
                                      height: 16,
                                      margin: const EdgeInsets.only(right: 4),
                                      decoration: BoxDecoration(
                                        color: color,
                                        shape: BoxShape.circle,
                                        border: Border.all(
                                          color: Colors.white,
                                          width: 1.5,
                                        ),
                                      ),
                                    ))
                                .toList(),
                          ),
                        ],
                      ),
                    ],
                  ),
                ],
              ),
            )
          : const SizedBox.shrink(),
    );
  }

  @override
  Widget build(BuildContext context) {
    final chartTitles = _getChartTitles();
    final chartDescriptions = _getChartDescriptions();

    return Scaffold(
      backgroundColor: Theme.of(context).colorScheme.surface,
      appBar: AppBar(
        elevation: 0,
        backgroundColor: Colors.transparent,
        title: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              '🔮 Cristalyse',
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
              ),
            ),
            Text(
              'Grammar of Graphics for Flutter',
              style: TextStyle(
                fontSize: 12,
                color: Colors.grey[600],
                fontWeight: FontWeight.normal,
              ),
            ),
          ],
        ),
        actions: [
          IconButton(
            onPressed: () => setState(() => _showControls = !_showControls),
            icon: Icon(_showControls ? Icons.visibility_off : Icons.visibility),
          ),
        ],
        bottom: TabBar(
          controller: _tabController,
          isScrollable: true,
          tabAlignment: TabAlignment.start,
          indicatorWeight: 3,
          labelStyle: const TextStyle(fontWeight: FontWeight.w600),
          tabs: const [
            Tab(text: 'Scatter Plot'),
            Tab(text: 'Interactive'), // New tab
            Tab(text: 'Line Chart'),
            Tab(text: 'Bar Chart'),
            Tab(text: 'Grouped Bars'),
            Tab(text: 'Horizontal Bars'),
            Tab(text: 'Stacked Bars'),
            Tab(text: 'Dual Y-Axis'),
          ],
        ),
      ),
      body: Column(
        children: [
          _buildControlPanel(),
          Expanded(
            child: TabBarView(
              controller: _tabController,
              children: [
                _buildChartPage(
                  chartTitles[0],
                  chartDescriptions[0],
                  buildScatterPlotTab(
                      currentTheme, _scatterPlotData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Avg Deal Size', '\$47.2k', '+12.3%', Colors.blue),
                    _buildStatsCard(
                        'Conversion Rate', '23.4%', '+2.1%', Colors.green),
                    _buildStatsCard(
                        'Total Deals', '156', '+8.9%', Colors.orange),
                  ],
                ),
                _buildChartPage(
                  // New interactive tab
                  chartTitles[1],
                  chartDescriptions[1],
                  buildInteractiveScatterTab(
                      currentTheme, _scatterPlotData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Hover Events', '234', '+45%', Colors.purple),
                    _buildStatsCard(
                        'Click Events', '89', '+12%', Colors.indigo),
                    _buildStatsCard(
                        'Tooltip Views', '1.2k', '+67%', Colors.teal),
                  ],
                ),
                _buildChartPage(
                  chartTitles[2],
                  chartDescriptions[2],
                  buildLineChartTab(currentTheme, _lineChartData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Monthly Growth', '3.2%', '+0.4%', Colors.green),
                    _buildStatsCard(
                        'Active Users', '89.4k', '+15.2%', Colors.blue),
                    _buildStatsCard(
                        'Retention', '87.2%', '+1.8%', Colors.purple),
                  ],
                ),
                _buildChartPage(
                  chartTitles[3],
                  chartDescriptions[3],
                  buildBarChartTab(currentTheme, _barChartData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Q4 Revenue', '\$1.2M', '+24.7%', Colors.green),
                    _buildStatsCard(
                        'YoY Growth', '31.5%', '+5.2%', Colors.blue),
                    _buildStatsCard(
                        'Profit Margin', '18.3%', '+2.1%', Colors.orange),
                  ],
                ),
                _buildChartPage(
                  chartTitles[4],
                  chartDescriptions[4],
                  buildGroupedBarTab(
                      currentTheme, _groupedBarData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Mobile Revenue', '\$450k', '+18.2%', Colors.blue),
                    _buildStatsCard(
                        'Web Platform', '\$320k', '+12.4%', Colors.green),
                    _buildStatsCard(
                        'API Services', '\$180k', '+8.7%', Colors.orange),
                  ],
                ),
                _buildChartPage(
                  chartTitles[5],
                  chartDescriptions[5],
                  buildHorizontalBarTab(
                      currentTheme, _horizontalBarData, _sliderValue),
                  [
                    _buildStatsCard('Total Team', '127', '+12', Colors.blue),
                    _buildStatsCard(
                        'Eng Growth', '23.5%', '+3.2%', Colors.green),
                    _buildStatsCard(
                        'Avg Tenure', '2.8y', '+0.3y', Colors.purple),
                  ],
                ),
                _buildChartPage(
                  chartTitles[6],
                  chartDescriptions[6],
                  buildStackedBarTab(
                      currentTheme, _stackedBarData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Total Revenue', '\$385k', '+18.2%', Colors.green),
                    _buildStatsCard('Product Mix', '52%', '+3.1%', Colors.blue),
                    _buildStatsCard(
                        'Growth Rate', '23.4%', '+5.7%', Colors.orange),
                  ],
                ),
                _buildChartPage(
                  chartTitles[7],
                  chartDescriptions[7],
                  buildDualAxisTab(currentTheme, _dualAxisData, _sliderValue),
                  [
                    _buildStatsCard(
                        'Avg Revenue', '\$156k', '+12.8%', Colors.blue),
                    _buildStatsCard(
                        'Avg Conversion', '19.2%', '+2.4%', Colors.green),
                    _buildStatsCard(
                        'Correlation', '0.73', '+0.12', Colors.purple),
                  ],
                ),
              ],
            ),
          ),
        ],
      ),
      floatingActionButton: AnimatedBuilder(
        animation: _fabAnimation,
        builder: (context, child) {
          return Transform.scale(
            scale: _fabAnimation.value,
            child: Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [
                FloatingActionButton.extended(
                  onPressed: () {
                    setState(() {
                      _currentThemeIndex =
                          (_currentThemeIndex + 1) % _themes.length;
                    });
                  },
                  icon: const Icon(Icons.palette),
                  label: Text(_themeNames[_currentThemeIndex]),
                  backgroundColor: Theme.of(context).primaryColor,
                  foregroundColor: Colors.white,
                ),
                const SizedBox(width: 16),
                FloatingActionButton(
                  onPressed: () {
                    setState(() {
                      _currentPaletteIndex =
                          (_currentPaletteIndex + 1) % _colorPalettes.length;
                    });
                  },
                  backgroundColor: _colorPalettes[_currentPaletteIndex].first,
                  foregroundColor: Colors.white,
                  child: const Icon(Icons.color_lens),
                ),
              ],
            ),
          );
        },
      ),
    );
  }

  Widget _buildChartPage(
      String title, String description, Widget chart, List<Widget> stats) {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            title,
            style: const TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.bold,
            ),
          ),
          const SizedBox(height: 4),
          Text(
            description,
            style: TextStyle(
              fontSize: 14,
              color: Colors.grey[600],
              height: 1.3,
            ),
          ),
          const SizedBox(height: 16),

          // Stats Row
          Row(
            children: stats
                .map((stat) => Expanded(
                      child: Padding(
                        padding: const EdgeInsets.only(right: 8),
                        child: stat,
                      ),
                    ))
                .toList(),
          ),

          const SizedBox(height: 16),

          // Chart Container
          Container(
            height: 380,
            width: double.infinity,
            decoration: BoxDecoration(
              color: currentTheme.backgroundColor,
              borderRadius: BorderRadius.circular(16),
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withValues(alpha: 0.1),
                  blurRadius: 20,
                  offset: const Offset(0, 8),
                ),
              ],
            ),
            child: ClipRRect(
              borderRadius: BorderRadius.circular(16),
              child: chart,
            ),
          ),

          const SizedBox(height: 16),

          // Features section
          Container(
            padding: const EdgeInsets.all(16),
            decoration: BoxDecoration(
              color: Theme.of(context).cardColor,
              borderRadius: BorderRadius.circular(12),
              border: Border.all(
                color: Theme.of(context).dividerColor.withValues(alpha: 0.1),
              ),
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Icon(
                      Icons.auto_awesome,
                      color: Theme.of(context).primaryColor,
                      size: 18,
                    ),
                    const SizedBox(width: 8),
                    Text(
                      'Chart Features',
                      style: TextStyle(
                        fontSize: 14,
                        fontWeight: FontWeight.bold,
                        color: Theme.of(context).primaryColor,
                      ),
                    ),
                  ],
                ),
                const SizedBox(height: 10),
                _buildFeatureList(),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildFeatureList() {
    final features = _getChartFeatures();
    return Column(
      children: features
          .map((feature) => Padding(
                padding: const EdgeInsets.symmetric(vertical: 2),
                child: Row(
                  children: [
                    Container(
                      width: 4,
                      height: 4,
                      decoration: BoxDecoration(
                        color: Theme.of(context).primaryColor,
                        shape: BoxShape.circle,
                      ),
                    ),
                    const SizedBox(width: 10),
                    Expanded(
                      child: Text(
                        feature,
                        style: TextStyle(
                          fontSize: 13,
                          color: Colors.grey[700],
                          height: 1.3,
                        ),
                      ),
                    ),
                  ],
                ),
              ))
          .toList(),
    );
  }

  List<String> _getChartFeatures() {
    switch (_tabController.index) {
      case 0:
        return [
          'Grammar of graphics API with intuitive data mapping',
          'Smooth 60fps animations with elastic curves',
          'Size and color encoding for multi-dimensional data',
          'Responsive scaling and high-DPI support'
        ];
      case 1: // Interactive scatter plot
        return [
          'Rich tooltip system with customizable content and styling',
          'Hover detection with spatial indexing for smooth performance',
          'Click interactions for navigation and custom actions',
          'Mobile-optimized touch handling and gesture recognition'
        ];
      case 2:
        return [
          'Progressive line drawing with smooth transitions',
          'Multi-series support with automatic color mapping',
          'Customizable stroke width and transparency',
          'Optimized for time-series and continuous data'
        ];
      case 3:
        return [
          'Categorical data visualization with ordinal scales',
          'Staggered bar animations for visual impact',
          'Automatic baseline detection and scaling',
          'Customizable bar width and styling options'
        ];
      case 4:
        return [
          'Side-by-side comparison of multiple data series',
          'Coordinated group animations with smooth timing',
          'Automatic legend generation from color mappings',
          'Perfect for product or regional comparisons'
        ];
      case 5:
        return [
          'Coordinate system flipping for horizontal layouts',
          'Ideal for ranking and categorical comparisons',
          'Space-efficient labeling for long category names',
          'Consistent animation system across orientations'
        ];
      case 6:
        return [
          'Segment-by-segment progressive stacking animation',
          'Automatic part-to-whole relationship visualization',
          'Consistent color mapping across all segments',
          'Perfect for budget breakdowns and composition analysis'
        ];
      case 7:
        return [
          'Dual Y-axis support for different data scales',
          'Independent left and right axis scaling',
          'Combined bar and line visualizations',
          'Perfect for correlating volume vs efficiency metrics'
        ];
      default:
        return [];
    }
  }
}