0e64dc8525
- Create KnowledgeGraphViewer component with @xyflow/react - Implement three layout types: force-directed, hierarchical (ELK), circular - Add node sizing based on connection count (40px-120px range) - Apply PDA-friendly status colors (green=published, blue=draft, gray=archived) - Highlight orphan nodes with distinct color - Add interactive features: zoom, pan, click-to-navigate - Implement filters: status, tags, show/hide orphans - Add statistics display and legend panel - Create comprehensive test suite (16 tests, all passing) - Add fetchKnowledgeGraph API function - Create /knowledge/graph page - Performance tested with 500+ nodes - All quality gates passed (tests, typecheck, lint) Refs #72 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
128 lines
3.7 KiB
Markdown
128 lines
3.7 KiB
Markdown
# Issue #72: Graph Visualization Component
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## Objective
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Create interactive knowledge graph visualization component in Next.js web UI using the graph API from issue #71.
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## Approach
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1. Research and select graph visualization library
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2. Follow TDD: Write tests before implementation
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3. Create graph visualization component with:
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- Force-directed layout
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- Node sizing based on connections
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- PDA-friendly status colors
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- Click handlers for navigation
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- Zoom/pan controls
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- Layout toggle options
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4. Performance test with 500+ nodes
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5. Integrate with graph API
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## Library Selection
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Evaluating options:
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- **react-force-graph**: WebGL-based, high performance, good for 500+ nodes
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- **vis-network**: Canvas-based, feature-rich
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- **d3-force**: Low-level, full control but more complex
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**Decision: react-force-graph-2d**
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- Best performance for 500+ nodes (WebGL rendering)
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- Simple API
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- Built-in zoom/pan
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- Easy to customize node appearance
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- Active maintenance
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## Progress
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- [x] Create scratchpad
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- [x] Set up component structure
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- [x] Write tests (TDD) - 16 tests, all passing
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- [x] Implement basic graph rendering
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- [x] Add node sizing logic (based on connection count)
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- [x] Add status-based coloring (PDA-friendly colors)
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- [x] Implement click handlers (navigation to entry)
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- [x] Add layout controls (force, hierarchical, circular)
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- [x] Performance testing (supports 500+ nodes)
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- [x] Create display page at /knowledge/graph
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- [x] Add filters (status, tags, orphans)
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- [x] Type checking passes
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- [x] Linting passes
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- [ ] Code review
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- [ ] QA checks
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- [ ] Commit and close issue
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## Testing Strategy
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1. Unit tests for graph component
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2. Test node rendering
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3. Test interaction handlers
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4. Test layout switching
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5. Performance test with large datasets
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## PDA-Friendly Colors
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From CLAUDE.md:
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- 🟢 Active: green-500
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- 🔵 Scheduled: blue-500
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- ⏸️ Paused: yellow-500
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- 💤 Dormant: gray-400
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- ⚪ Archived: gray-300
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## Implementation Summary
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### Components Created
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1. **KnowledgeGraphViewer.tsx** - Main graph visualization component
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- Force-directed, hierarchical, and circular layout options
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- PDA-friendly status colors (green=published, blue=draft, gray=archived)
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- Node sizing based on connection count
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- Interactive zoom/pan controls
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- Click to navigate to entry
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- Filters: status, tags, orphan visibility
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- Legend panel showing color meanings
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2. **KnowledgeGraphViewer.test.tsx** - Comprehensive test suite
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- 16 tests covering all features
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- 100% test pass rate
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- Performance test with 500+ nodes
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3. **page.tsx** - Display page at /knowledge/graph
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### API Integration
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- Added fetchKnowledgeGraph() to knowledge.ts API client
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- Fetches from /api/knowledge/graph endpoint (implemented in issue #71)
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- Supports filtering by tags, status, and limit
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### Libraries Used
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- @xyflow/react - Graph rendering and layout
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- elkjs - Hierarchical layout algorithm
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- Already in package.json, no new dependencies needed
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### Features Implemented
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- ✅ Force-directed layout (default)
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- ✅ Hierarchical layout (ELK algorithm)
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- ✅ Circular layout
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- ✅ Node sizing based on connections (40px - 120px)
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- ✅ PDA-friendly colors by status
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- ✅ Orphan node detection and highlighting
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- ✅ Click to navigate to entry
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- ✅ Zoom and pan controls (ReactFlow built-in)
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- ✅ MiniMap for navigation
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- ✅ Filters: status, tags, show/hide orphans
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- ✅ Statistics display (total nodes, edges, orphans)
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- ✅ Legend panel
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- ✅ Performance tested with 500+ nodes
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### Notes
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- Using @xyflow/react instead of react-force-graph (already in dependencies)
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- Memoization implemented for filtered nodes/edges
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- Layout calculations are async to prevent UI blocking
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- All quality gates passed (tests, typecheck, lint)
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