Export

Overview

Cristalyse provides powerful export capabilities, allowing you to save charts as scalable vector graphics (SVG) for use in presentations, reports, and publications. All visual elements, styling, and data are preserved in the exported format.

SVG Export

Basic SVG Export

Export charts as scalable vector graphics with perfect quality at any size:

// Create your chart
final chart = CristalyseChart()
  .data(data)
  .mapping(x: 'month', y: 'revenue')
  .geomBar()
  .theme(ChartTheme.defaultTheme())
  .build();

// Export as SVG
final result = await chart.exportAsSvg(
  width: 800,
  height: 600,
  filename: 'revenue_chart',
);

print('Chart exported to: ${result.filePath}');

Advanced Export Configuration

Customize export settings for different use cases:

final exportConfig = ExportConfig(
  width: 1920,           // High resolution for presentations
  height: 1080,
  format: ExportFormat.svg,
  backgroundColor: Colors.white,
  filename: 'dashboard_chart',
  quality: 1.0,          // Maximum quality
  transparentBackground: false,
);

final result = await chart.export(exportConfig);

Export with Custom Dimensions

Optimize for different output formats:

// For presentations (16:9 aspect ratio)
await chart.exportAsSvg(
  width: 1920,
  height: 1080,
  filename: 'presentation_chart',
);

// For print documents (300 DPI equivalent)
await chart.exportAsSvg(
  width: 2400,
  height: 1800,
  filename: 'print_chart',
);

// For web thumbnails
await chart.exportAsSvg(
  width: 400,
  height: 300,
  filename: 'thumbnail_chart',
);

Export Examples

Dashboard Export

Export complex multi-chart dashboards:

class DashboardExporter {
  static Future<List<ExportResult>> exportDashboard(
    List<CristalyseChart> charts,
  ) async {
    final results = <ExportResult>[];
    
    for (int i = 0; i < charts.length; i++) {
      final result = await charts[i].exportAsSvg(
        width: 800,
        height: 600,
        filename: 'dashboard_chart_$i',
      );
      results.add(result);
    }
    
    return results;
  }
}

// Usage
final charts = [revenueChart, usersChart, conversionChart];
final exportResults = await DashboardExporter.exportDashboard(charts);

for (final result in exportResults) {
  print('Exported: ${result.filePath} (${result.fileSizeBytes} bytes)');
}

Themed Export

Export charts with consistent branding:

class BrandedExporter {
  static final brandTheme = ChartTheme(
    backgroundColor: const Color(0xFFF8F9FA),
    primaryColor: const Color(0xFF007ACC),
    colorPalette: [
      const Color(0xFF007ACC),
      const Color(0xFFFF6B35),
      const Color(0xFF28A745),
      const Color(0xFFDC3545),
    ],
    // ... other brand properties
  );
  
  static Future<ExportResult> exportBrandedChart({
    required List<Map<String, dynamic>> data,
    required String xColumn,
    required String yColumn,
    required String filename,
  }) async {
    final chart = CristalyseChart()
      .data(data)
      .mapping(x: xColumn, y: yColumn)
      .geomBar()
      .theme(brandTheme)
      .build();
    
    return await chart.exportAsSvg(
      width: 1200,
      height: 800,
      backgroundColor: brandTheme.backgroundColor,
      filename: filename,
    );
  }
}

Batch Export

Export multiple chart variations efficiently:

class BatchExporter {
  static Future<void> exportChartVariations({
    required List<Map<String, dynamic>> data,
    required String baseFilename,
  }) async {
    final themes = [
      ChartTheme.defaultTheme(),
      ChartTheme.darkTheme(),
      ChartTheme.solarizedLightTheme(),
    ];
    
    final themeNames = ['light', 'dark', 'solarized'];
    
    for (int i = 0; i < themes.length; i++) {
      final chart = CristalyseChart()
        .data(data)
        .mapping(x: 'month', y: 'value')
        .geomLine(strokeWidth: 3.0)
        .geomPoint(size: 6.0)
        .theme(themes[i])
        .build();
      
      await chart.exportAsSvg(
        width: 800,
        height: 600,
        filename: '${baseFilename}_${themeNames[i]}',
      );
    }
  }
}

Export Quality & Optimization

Vector Benefits

SVG exports provide numerous advantages:

Infinite Scalability: Perfect quality at any size
Small File Sizes: Efficient vector representation
Editable: Can be modified in vector graphics software
Web Ready: Direct embedding in HTML
Print Quality: Crisp output at any resolution

File Size Optimization

Control output file size for different use cases:

// Minimal file size for web
await chart.exportAsSvg(
  width: 600,
  height: 400,
  filename: 'web_optimized',
);

// High quality for print
await chart.exportAsSvg(
  width: 2400,
  height: 1600,
  filename: 'print_quality',
);

Performance Considerations

Optimize export performance for large datasets:

class PerformantExporter {
  static Future<ExportResult> exportLargeDataset({
    required List<Map<String, dynamic>> data,
    required String filename,
  }) async {
    // Simplify data for export if needed
    final exportData = data.length > 1000 
        ? _downsampleData(data, 1000)
        : data;
    
    final chart = CristalyseChart()
      .data(exportData)
      .mapping(x: 'x', y: 'y')
      .geomLine(strokeWidth: 2.0)
      .build();
    
    return await chart.exportAsSvg(
      width: 1200,
      height: 800,
      filename: filename,
    );
  }
  
  static List<Map<String, dynamic>> _downsampleData(
    List<Map<String, dynamic>> data, 
    int targetCount,
  ) {
    final step = data.length / targetCount;
    final result = <Map<String, dynamic>>[];
    
    for (int i = 0; i < data.length; i += step.ceil()) {
      result.add(data[i]);
    }
    
    return result;
  }
}

Export Integration

File Management

Handle exported files efficiently:

class ExportManager {
  static const String exportDirectory = 'chart_exports';
  
  static Future<Directory> getExportDirectory() async {
    final documentsDir = await getApplicationDocumentsDirectory();
    final exportDir = Directory('${documentsDir.path}/$exportDirectory');
    
    if (!await exportDir.exists()) {
      await exportDir.create(recursive: true);
    }
    
    return exportDir;
  }
  
  static Future<ExportResult> exportWithTimestamp({
    required CristalyseChart chart,
    required String baseName,
  }) async {
    final timestamp = DateTime.now().millisecondsSinceEpoch;
    final filename = '${baseName}_$timestamp';
    
    final exportDir = await getExportDirectory();
    final customPath = '${exportDir.path}/$filename.svg';
    
    return await chart.exportAsSvg(
      width: 1200,
      height: 800,
      filename: filename,
      customPath: customPath,
    );
  }
}

Export and share charts directly:

class ShareableExporter {
  static Future<void> exportAndShare({
    required CristalyseChart chart,
    required String title,
    required BuildContext context,
  }) async {
    try {
      // Export chart
      final result = await chart.exportAsSvg(
        width: 1200,
        height: 800,
        filename: 'shared_chart',
      );
      
      // Share the exported file
      await Share.shareFiles(
        [result.filePath],
        text: title,
        subject: 'Chart Export',
      );
      
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Export failed: $e'),
          backgroundColor: Colors.red,
        ),
      );
    }
  }
}

Cloud Storage Integration

Upload exports to cloud storage:

class CloudExporter {
  static Future<String> exportToCloud({
    required CristalyseChart chart,
    required String cloudPath,
  }) async {
    // Export locally first
    final result = await chart.exportAsSvg(
      width: 1200,
      height: 800,
      filename: 'temp_export',
    );
    
    // Upload to cloud storage (example with Firebase)
    final file = File(result.filePath);
    final storageRef = FirebaseStorage.instance.ref().child(cloudPath);
    
    final uploadTask = await storageRef.putFile(file);
    final downloadUrl = await uploadTask.ref.getDownloadURL();
    
    // Clean up local file
    await file.delete();
    
    return downloadUrl;
  }
}

Error Handling

Robust Export Operations

Handle export failures gracefully:

class SafeExporter {
  static Future<ExportResult?> safeExport({
    required CristalyseChart chart,
    required String filename,
    required VoidCallback? onSuccess,
    required Function(String)? onError,
  }) async {
    try {
      final result = await chart.exportAsSvg(
        width: 1200,
        height: 800,
        filename: filename,
      );
      
      onSuccess?.call();
      return result;
      
    } on ChartExportException catch (e) {
      onError?.call('Export failed: ${e.message}');
      return null;
    } catch (e) {
      onError?.call('Unexpected error: $e');
      return null;
    }
  }
}

// Usage
await SafeExporter.safeExport(
  chart: myChart,
  filename: 'report_chart',
  onSuccess: () => showSuccessMessage(),
  onError: (error) => showErrorDialog(error),
);

Export Validation

Verify export results:

class ExportValidator {
  static bool validateExportResult(ExportResult result) {
    // Check file exists
    final file = File(result.filePath);
    if (!file.existsSync()) return false;
    
    // Check file size is reasonable
    if (result.fileSizeBytes < 100) return false; // Too small
    if (result.fileSizeBytes > 10 * 1024 * 1024) return false; // Too large
    
    // Check dimensions
    if (result.dimensions.width <= 0 || result.dimensions.height <= 0) {
      return false;
    }
    
    return true;
  }
}

Export Formats & Use Cases

SVG Vector Graphics
High Resolution
Web Optimized

Best for:

Presentations and reports
Web embedding
Print publications
Scalable graphics

Features:

Infinite scalability
Small file sizes
Editable in vector software
Perfect text rendering

Best Practices

File Organization

Use descriptive filenames with timestamps
Organize exports in dedicated directories
Include chart metadata in filenames
Implement cleanup routines for old exports

Quality Control

Validate export results before use
Test exports at different scales
Verify color accuracy across formats
Check text readability at target sizes

Performance

Batch exports for efficiency
Downsample large datasets when appropriate
Use appropriate dimensions for use case
Clean up temporary files promptly

User Experience

Provide progress indicators for long exports
Show clear success/failure messages
Offer preview before final export
Enable easy sharing and storage options

Export Examples

Presentation Ready

High-resolution exports optimized for professional presentations

Web Integration

Lightweight SVG files perfect for web embedding

Print Quality

High-DPI exports suitable for professional printing

Batch Processing

Efficient batch export workflows for multiple charts

Next Steps

Theming

Export charts with consistent branding and styling

Interactions

Preserve interactive elements in static exports

Performance

Optimize export performance for large datasets

Custom Themes

Create export-optimized theme variations

Get Started

Chart Types

Features

Advanced

Overview

SVG Export

Basic SVG Export

Advanced Export Configuration

Export with Custom Dimensions

Export Examples

Dashboard Export

Themed Export

Batch Export

Export Quality & Optimization

Vector Benefits

File Size Optimization

Performance Considerations

Export Integration

File Management

Cloud Storage Integration

Error Handling

Robust Export Operations

Export Validation

Export Formats & Use Cases

Best Practices

Export Examples

Presentation Ready

Web Integration

Print Quality

Batch Processing

Next Steps

Theming

Interactions

Performance

Custom Themes

​Overview

​SVG Export

​Basic SVG Export

​Advanced Export Configuration

​Export with Custom Dimensions

​Export Examples

​Dashboard Export

​Themed Export

​Batch Export

​Export Quality & Optimization

​Vector Benefits

​File Size Optimization

​Performance Considerations

​Export Integration

​File Management

​Share Integration

​Cloud Storage Integration

​Error Handling

​Robust Export Operations

​Export Validation

​Export Formats & Use Cases

​Best Practices

​Export Examples

Presentation Ready

Web Integration

Print Quality

Batch Processing

​Next Steps

Theming

Interactions

Performance

Custom Themes

Overview

SVG Export

Basic SVG Export

Advanced Export Configuration

Export with Custom Dimensions

Export Examples

Dashboard Export

Themed Export

Batch Export

Export Quality & Optimization

Vector Benefits

File Size Optimization

Performance Considerations

Export Integration

File Management

Share Integration

Cloud Storage Integration

Error Handling

Robust Export Operations

Export Validation

Export Formats & Use Cases

Best Practices

Export Examples

Next Steps