# Interactive Kernel Convolution Visualizer - Updates Log

## Version 0.1.0 - Initial Planning (2026-08-06)

### Project Initialization
- Created comprehensive project plan (plan.md)
- Established project directory structure
- Defined core features, technical architecture, and development phases
- Identified target audience and success metrics

### Key Decisions
1. **Tech Stack**: Next.js 14+ with TypeScript, Tailwind CSS, Framer Motion
2. **Canvas Approach**: HTML5 Canvas API primary, WebGL as performance fallback
3. **State Management**: Zustand for global state
4. **Convolution Implementation**: Custom JavaScript (no OpenCV.js dependency)
5. **Animation**: RequestAnimationFrame with configurable frame batching

### Architecture Highlights
- Modular component structure separating concerns
- Step-by-step convolution generator for educational visualization
- Web Worker support for heavy computation
- Progressive rendering to maintain UI responsiveness
- Comprehensive type definitions for type safety

### Development Phases Defined
8 phases over ~8 weeks covering:
1. Foundation & Setup
2. Core Convolution Engine
3. Animation & Visualization
4. Interactive Controls
5. Comparison & Analysis
6. Educational Features
7. Export & Polish
8. Advanced Features

### Risk Mitigation Strategies
- Performance: Web Workers, progressive rendering, WebGL fallback
- Memory: Canvas pooling, proper cleanup
- Cross-browser: Feature detection, polyfills
- State complexity: Zustand with immutable updates

---

## Version 0.2.0 - Phase 1 Complete: Foundation & Setup (2026-08-06)

### Completed
- [x] Next.js 14+ project initialized with TypeScript, Tailwind CSS, ESLint
- [x] Additional dependencies installed: Zustand, Framer Motion, Lucide React, Radix UI
- [x] Project directory structure created (components, hooks, lib, store, types, utils)
- [x] TypeScript type definitions for all core data structures
- [x] Kernel library with 25+ predefined kernels across 6 categories
- [x] Convolution engine with step-by-step generator and padding strategies
- [x] Zustand store with complete state management for images, kernels, convolution, settings, comparison
- [x] Custom React hooks: useConvolution, useImageLoader, useCanvas, useZoomPan
- [x] UI component library: Button, Input, Select, Slider, Card, Badge, Tooltip
- [x] Canvas visualization components: ConvolutionCanvas, ImageCanvas, SplitView
- [x] Control components: PlaybackControls, OverlayControls, PaddingControls, KernelInfoPanel
- [x] KernelSelector component with search, categories, and custom kernel editor
- [x] Main page with three-panel layout (controls, visualization, info)
- [x] Drag-and-drop image upload with preview
- [x] Responsive layout with resizable sidebars
- [x] Dark mode support
- [x] Help modal and settings modal
- [x] README.md with comprehensive documentation
- [x] Updated package.json with proper metadata and scripts

### In Progress
- [ ] Phase 2: Core Convolution Engine optimization
- [ ] Phase 3: Animation & Visualization polish
- [ ] Phase 4: Interactive Controls refinement

### Notes
- All foundation components are in place and typed
- Convolution engine implements all 4 padding modes
- Generator-based step-by-step execution for educational visualization
- State management handles complex interactions between components
- Ready for Phase 2 optimization and Phase 3 visualization enhancements

---

## Version 0.3.0 - Phase 2 Complete: Static Convolution Visualization (2026-08-06)

### Completed
- [x] Added `computeConvolutionStep()` function to convolution engine for single-pixel inspection
- [x] Created `useStaticConvolution` hook for static inspection capabilities
- [x] Built `StaticConvolutionView` component with 5 educational tabs:
  - Overview: Input patch, kernel values, computation summary
  - Image Patch: Detailed patch view at clicked position
  - Multiplications: Element-wise pixel × kernel breakdown
  - Summation: Step-by-step Σ(pixel × kernel) with normalization
  - Padding: Visual demonstration of padding strategies at borders
- [x] Implemented click-to-inspect on main ConvolutionCanvas
- [x] Created reusable Tabs UI component with Radix UI
- [x] Integrated static inspector into right sidebar (replaces kernel info when active)
- [x] Added channel selector (Red/Green/Blue/Alpha) for per-channel inspection
- [x] All 4 padding modes (zero, reflect, replicate, wrap) working in static view

### Technical Achievements
- Build passes: `npm run build` ✓
- TypeScript passes: `npm run type-check` ✓
- Dev server runs without errors ✓
- Efficient single-pixel computation without full generator execution
- Reuses existing ConvolutionStep type for consistency
- Handles edge cases (clamped coordinates, invalid channels)

### In Progress
- [ ] Phase 3: Animation & Visualization
- [ ] Phase 4: Interactive Controls
- [ ] Phase 5: Comparison & Analysis

---

## Version 0.4.0 - Phase 3 Complete: Animation & Visualization (2026-08-06)

### Completed
- [x] Fixed animation loop batch processing for smooth 60fps visualization
  - Dynamic batch size calculation based on animation speed
  - Frame budgeting (8ms compute / 8ms render per 16.67ms frame)
  - Automatic yield to main thread when frame budget exceeded
- [x] Implemented progressive output rendering during animation
  - Partial output images yielded every ~20 rows
  - ConvolutionStep type extended with `partialOutputImageData` and `isPartialOutput`
  - Store updates processedImageData in real-time for live preview
- [x] Fixed step mode integration with animation loop
  - Step button advances exactly one convolution step
  - Preserves pause state when stepping
  - Step mode toggle works correctly with play/pause
- [x] Added frame rate limiting for consistent 60fps
  - Minimum frame interval enforcement (16.67ms)
  - Uses setTimeout + requestAnimationFrame for precise timing
  - Prevents CPU spinning when computation is fast
- [x] Optimized convolution generator for animation performance
  - Pre-computed kernel values and normalization factors
  - Efficient partial image creation with incremental updates
  - Generator yields control back to main thread periodically

### Technical Achievements
- Build passes: `npm run build` ✓
- TypeScript passes: `npm run type-check` ✓
- Dev server runs without errors ✓
- Animation runs smoothly at 60fps with configurable speed (0.1x - 10x)
- Progressive output shows convolution building up in real-time
- Step mode allows single-step inspection during animation
- Frame budgeting prevents UI jank during heavy computation

### In Progress
- [ ] Phase 4: Interactive Controls
- [ ] Phase 5: Comparison & Analysis
- [ ] Phase 6: Educational Features