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Major features: - Functional arrows that propagate values between shapes - Arrow drawing with snap-to-shape centers - Arrow selection with visual highlighting (cyan, 4px) - Propagator system (inline FolkJS-inspired implementation) - Shape value editor and arrow expression editor - Test Propagation button to trigger data flow Critical bug fixes: - EventTarget storage in separate Map to survive React state updates - Stale closure fix using functional setState pattern - Negative dimension normalization for rectangles - Arrow hit detection using point-to-line distance algorithm - Propagator cleanup on arrow deletion Code quality improvements: - Extracted isPointInShape() helper (removed ~30 lines duplication) - Added HIT_TOLERANCE constant (no magic numbers) - Removed debug logging after troubleshooting - Proper resource cleanup (dispose propagators) Documentation: - Created CANVAS_DEVELOPMENT_GUIDE.md (comprehensive technical reference) - Created SESSION_2025-11-07.md (session journal with lessons learned) - Updated README.md (project overview with 6-phase roadmap) - Updated CLAUDE.md (added Development Journal section) - All docs moved to .claude/journal/ Technical discoveries documented: 1. React state immutability & EventTarget storage pattern 2. Stale closure pattern in event handlers 3. Negative dimensions bug in canvas drawing 4. Point-to-line distance algorithm for hit detection 5. Code organization best practices Files modified: - app/italism/page.tsx: 769 lines (+150 net) - README.md: Complete rewrite with practical info - package.json: TypeScript config updates - tsconfig.json: Next.js auto-updates Status: Phase 1 Complete ✅ Next: Phase 2 (expression parser, arrow auto-update, flow animation) 🤖 Generated with Claude Code (https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> |
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