Add Marker Clustering for Map Performance and Enhanced User Experience

[Madhavi1108]

Description

This PR introduces marker clustering to the MapComponent to significantly improve rendering performance and usability when displaying large numbers of parking locations.

The implementation integrates react-leaflet-cluster with custom cluster styling, dynamic sizing, interactive animations, and optimized clustering behavior. Comprehensive tests have also been added to validate rendering, clustering, and edge cases involving invalid or missing location data.

Resolves #244

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• ⚙️ CI/CD or build pipeline change
• ⚡ Performance optimization
• 🛠️ Refactoring (no functional changes)

Screenshots / Recordings

Before	After
Individual markers were rendered for every parking location, leading to clutter and reduced performance with large datasets.	Nearby parking locations are grouped into animated clusters with dynamic sizing, smooth interactions, and significantly improved rendering performance.

How Has This Been Tested?

Automated Tests

• Frontend lint completed successfully (npm run lint)
• Production build verified (npm run build)
• Component test suite executed (npm run test)
• Marker clustering tests added for MapComponent

Manual Verification

Verified the following workflows:

• Loaded maps with large parking datasets
• Zoomed in and out to verify cluster expansion
• Confirmed clustering disables at street-level zoom
• Hovered over clusters to verify coverage highlighting
• Verified custom cluster styling and animations
• Confirmed valid markers continue rendering correctly
• Verified smooth interaction while panning and zooming

Edge Cases Tested

• Empty parking location dataset
• Missing status values
• Missing availableSlots values
• Invalid NaN coordinates
• Undefined coordinates
• Incorrect coordinate data types
• Mixed valid and invalid marker data
• User location marker rendering with no parking locations
• Cluster rendering with filtered datasets
• Marker filtering without Leaflet runtime errors

What Was Implemented

Marker Clustering

Integrated marker clustering into the map.

Updated File

• src/components/MapComponent.tsx

The implementation provides:

• Automatic marker clustering
• Chunked marker loading
• Efficient rendering for large datasets
• Smooth zoom transitions
• Spiderfy support for overlapping markers

---

Custom Cluster Design

Created a custom cluster icon using L.DivIcon.

The cluster design includes:

• Dynamic sizing based on marker count
• Gradient styling
• Glassmorphism-inspired appearance
• Rounded layout
• Adaptive text sizing
• Modern visual theme

---

Enhanced User Experience

Improved cluster interaction.

The implementation includes:

• Hover scaling animation
• Pulse effect
• Coverage polygon on hover
• Automatic cluster expansion
• Clustering disabled at zoom level 16 for detailed street-level navigation

---

TypeScript Support

Added TypeScript declarations for the clustering library.

New File

• src/react-leaflet-cluster.d.ts

This enables seamless integration with the project's strict TypeScript configuration.

---

Testing

Added comprehensive component tests.

New File

• src/components/MapComponent.test.tsx

The tests verify:

• Marker cluster rendering
• Valid marker rendering
• Invalid coordinate filtering
• Empty dataset handling
• Missing property fallbacks
• User location rendering
• Stable rendering with malformed backend responses

Benefits

• Improved rendering performance for large datasets
• Reduced DOM node count
• Smoother map interaction
• Better visual organization of nearby parking locations
• Responsive cluster animations
• Enhanced map readability
• Graceful handling of malformed location data
• Improved TypeScript compatibility
• Comprehensive automated test coverage
• Better overall user experience

Deployment Notes

Note

No backend changes, database migrations, or environment variable updates are required.

The map now uses react-leaflet-cluster to efficiently group nearby parking markers, providing significantly better rendering performance while maintaining smooth zooming, clustering, and interaction behavior for large parking datasets.

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