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🎉 Cesium Layers System - Implementation Complete!

What Was Built

A complete modular layer system for your CesiumJS globe with:

1. Core Architecture (@we/widgets)

✅ CesiumGlobe Component - Refactored to support plugin-based layers

  • Event bus for inter-layer communication
  • Shared store for layer state
  • Dependency resolution (topological sort)
  • Lifecycle hooks: onMount, onUnmount, onUpdate, onCameraChange
  • Backward compatible with legacy locations prop

✅ Type Definitions - Full TypeScript support

  • CesiumLayer - Layer protocol interface
  • LayerContext - Context passed to each layer
  • LayerEventBus - Event system for communication
  • LayerStore - Shared state management
  • CameraState - Camera position/orientation
  • LayerFactory<T> - Factory function pattern
  • LayerConfig - Configuration object

2. Cesium Layers Package (@we/cesium-layers)

✅ User Locations Layer

  • Displays markers with labels on the globe
  • Click handler with events
  • Customizable marker size and colors
  • Example usage: 
    {
  factory: userLocationsLayer,
  options: {
    locations: [{ id: '1', name: 'Tokyo', latitude: 35.6762, longitude: 139.6503 }],
    onLocationClick: (location) => console.log(location),
  },
}

✅ Country Outlines Layer

  • Renders country boundaries using Natural Earth GeoJSON data
  • Customizable color, opacity, width
  • Uses CDN for data (no bundling required)
  • Example usage: 
    {
  factory: countryOutlinesLayer,
  options: { color: '#ffffff', opacity: 0.5, width: 2 },
}

✅ H3 Hexagons Layer

  • Displays H3 hexagonal grid on globe
  • Configurable resolution (0-15)
  • Click handler logs hexagon ID (ready for AD4M integration)
  • Example usage: 
    {
  factory: h3HexagonsLayer,
  options: {
    resolution: 0, // 122 global hexagons
    onHexagonClick: (h3Index) => console.log('Clicked:', h3Index),
  },
}

3. Documentation

✅ README.md with usage examples ✅ EXAMPLES.tsx with code samples ✅ Quick start guide

File Structure

packages/
├── design-system/5-widgets/
│   └── src/solid/widgets/cesium/
│       ├── CesiumGlobe.tsx (241 lines)
│       │   - SimpleEventBus implementation
│       │   - SimpleStore implementation
│       │   - sortLayersByDependencies function
│       │   - Layer mounting/unmounting logic
│       │   - Camera change listener
│       │   - Legacy location rendering
│       └── types.ts (92 lines)
│           - Complete type definitions for layer protocol
│
└── cesium-layers/
    ├── package.json
    ├── tsconfig.json
    ├── README.md
    ├── EXAMPLES.tsx
    └── src/
        ├── index.ts (exports)
        ├── types.ts (re-exports from @we/widgets)
        ├── user-locations.ts (102 lines)
        ├── country-outlines.ts (61 lines)
        └── h3-hexagons.ts (116 lines)

Built Artifacts

packages/cesium-layers/dist/
├── index.js + index.d.ts
├── types.js + types.d.ts
├── user-locations.js + user-locations.d.ts
├── country-outlines.js + country-outlines.d.ts
└── h3-hexagons.js + h3-hexagons.d.ts

Dependencies Installed

  • h3-js: ^4.1.0 (H3 geospatial indexing)
  • @types/cesium: ^1.70.0 (TypeScript definitions)
  • Cesium 1.136.0 (already loaded via CDN)

How to Use

import { CesiumGlobe } from '@we/widgets/solid';
import { userLocationsLayer, countryOutlinesLayer, h3HexagonsLayer } from '@we/cesium-layers';

function MyGlobe() {
  return (
    <CesiumGlobe
      ionAccessToken="your-token"
      layers={[
        {
          factory: userLocationsLayer,
          options: {
            locations: [
              { id: '1', name: 'Home', latitude: 37.7749, longitude: -122.4194 },
            ],
          },
        },
        {
          factory: countryOutlinesLayer,
          options: { color: '#ffffff', opacity: 0.5 },
        },
        {
          factory: h3HexagonsLayer,
          options: {
            resolution: 0,
            onHexagonClick: (h3Index) => {
              console.log('Hexagon clicked:', h3Index);
              // Future: navigateToSpace(h3Index);
            },
          },
        },
      ]}
    />
  );
}

Testing Checklist

To test the implementation:

  1. Import the layers in your app
  2. Add CesiumGlobe with layer configs
  3. Verify user locations render correctly
  4. Click a location marker - should log to console
  5. Toggle country outlines - should show/hide borders
  6. Click an H3 hexagon - should log H3 index to console
  7. Test with different H3 resolutions (0, 1, 2, 3)
  8. Test layer toggling with enabled: false

Next Steps

Immediate

  • Test in your actual application
  • Add more user locations with real data
  • Experiment with H3 resolutions

Near-term

  • Integrate H3 clicks with AD4M spaces
  • Add event listeners in parent component
  • Create custom layers for your use case
  • Add layer visibility controls UI

Future

  • Add more layers (roads, buildings, etc.)
  • Publish @we/cesium-layers to npm
  • Community contributions
  • Performance optimizations for high-resolution H3 grids

Architecture Benefits

✨ Modular - Each layer is independent and reusable ✨ Type-safe - Full TypeScript support ✨ Event-driven - Layers communicate via events ✨ Extensible - Easy to create new layers ✨ Dependency management - Layers can depend on other layers ✨ Clean separation - Business logic in layers, rendering in CesiumGlobe ✨ npm-ready - Can publish for community use

Performance Notes

  • H3 Resolution 0: 122 hexagons (very fast)
  • H3 Resolution 1: 842 hexagons (fast)
  • H3 Resolution 2: 5,882 hexagons (moderate)
  • H3 Resolution 3: 41,162 hexagons (slower, test first)
  • Higher resolutions may need viewport-based rendering

Event System

Current events emitted:

  • location-clicked - When user location is clicked
  • hexagon-clicked - When H3 hexagon is clicked
  • country-outlines-loaded - When country data loads
  • country-outlines-error - If country data fails to load
  • h3-hexagons-loaded - When hexagons finish rendering

Backward Compatibility

Old code still works:

<CesiumGlobe
  locations={[{ id: '1', name: 'Tokyo', latitude: 35.6762, longitude: 139.6503 }]}
/>

This uses the legacy rendering path (no layers).

Status: ✅ READY TO USE

All packages built successfully. No compilation errors. Ready for integration into your application!