File size: 4,951 Bytes
4398633 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 |
# ChartRenderer Refactoring
## 🎯 Overview
The original `ChartRenderer.svelte` (555 lines) has been refactored into a modular, maintainable architecture with clear separation of concerns.
## 📁 New Structure
```
renderers/
├── ChartRenderer.svelte # Original (555 lines)
├── ChartRendererRefactored.svelte # New orchestrator (~150 lines)
├── core/ # Core rendering modules
│ ├── svg-manager.js # SVG setup & layout management
│ ├── grid-renderer.js # Grid lines & dots rendering
│ ├── path-renderer.js # Curves & points rendering
│ └── interaction-manager.js # Mouse interactions & hover
└── utils/
└── chart-transforms.js # Data transformations
```
## 🔧 Modules Breakdown
### **SVGManager** (`svg-manager.js`)
- **Responsibility**: SVG creation, layout calculations, axis rendering
- **Key Methods**:
- `ensureSvg()` - Create SVG structure
- `updateLayout()` - Handle responsive layout
- `renderAxes()` - Draw X/Y axes with ticks
- `calculateDimensions()` - Mobile-friendly sizing
### **GridRenderer** (`grid-renderer.js`)
- **Responsibility**: Grid visualization (lines vs dots)
- **Key Methods**:
- `renderGrid()` - Main grid rendering
- `renderLinesGrid()` - Classic theme (lines)
- `renderDotsGrid()` - Oblivion theme (dots)
### **PathRenderer** (`path-renderer.js`)
- **Responsibility**: Training curves visualization
- **Key Methods**:
- `renderSeries()` - Main data rendering
- `renderMainLines()` - Primary curves
- `renderRawLines()` - Background smoothing lines
- `renderPoints()` - Data points
- `updatePointVisibility()` - Hover effects
### **InteractionManager** (`interaction-manager.js`)
- **Responsibility**: Mouse interactions and tooltips
- **Key Methods**:
- `setupHoverInteractions()` - Mouse event handling
- `findNearestStep()` - Cursor position calculations
- `prepareHoverData()` - Tooltip data formatting
- `showHoverLine()` / `hideHoverLine()` - Public API
### **ChartTransforms** (`chart-transforms.js`)
- **Responsibility**: Data processing and validation
- **Key Methods**:
- `processMetricData()` - Data bounds & domains
- `setupScales()` - D3 scale configuration
- `validateData()` - NaN protection
- `createNormalizeFunction()` - Value normalization
## 🎨 Benefits
### **Before Refactoring**
- ❌ 555 lines monolithic file
- ❌ Mixed responsibilities
- ❌ Hard to test individual features
- ❌ Difficult to modify specific behaviors
### **After Refactoring**
- ✅ ~150 lines orchestrator + focused modules
- ✅ Clear separation of concerns
- ✅ Each module easily testable
- ✅ Easy to extend/modify specific features
- ✅ Better code reusability
## 🔄 Migration Guide
### Using the Refactored Version
```javascript
// Replace this import:
import ChartRenderer from './renderers/ChartRenderer.svelte';
// With this:
import ChartRenderer from './renderers/ChartRendererRefactored.svelte';
```
The API is **100% compatible** - all props and methods work identically.
### Extending Functionality
```javascript
// Example: Adding a new renderer
import { PathRenderer } from './core/path-renderer.js';
class CustomPathRenderer extends PathRenderer {
renderCustomEffect() {
// Add custom visualization
}
}
// Use in ChartRendererRefactored.svelte
pathRenderer = new CustomPathRenderer(svgManager);
```
## 🧪 Testing
Each module can now be tested independently:
```javascript
// Example: Test SVGManager
import { SVGManager } from './core/svg-manager.js';
const mockContainer = document.createElement('div');
const svgManager = new SVGManager(mockContainer);
svgManager.ensureSvg();
// Assert SVG structure...
```
## 📈 Performance
- **Same performance** as original (no regression)
- **Better mobile handling** with improved resize logic
- **Cleaner memory management** with proper cleanup
- **Smaller bundle** per module (better tree shaking)
## 🚀 Future Enhancements
The modular structure enables easy additions:
1. **WebGL Renderer** - Replace PathRenderer for large datasets
2. **Animation System** - Add transition effects between states
3. **Custom Themes** - Extend GridRenderer for new visual styles
4. **Advanced Interactions** - Extend InteractionManager for zoom/pan
5. **Accessibility** - Add ARIA labels and keyboard navigation
## 🔍 Debugging
Each module logs its initialization and key operations:
```javascript
// Enable debug mode
console.log('📊 Chart managers initialized'); // SVGManager
console.log('🎯 Grid rendered'); // GridRenderer
console.log('📈 Series rendered'); // PathRenderer
console.log('🖱️ Interactions setup'); // InteractionManager
```
---
*This refactoring maintains 100% API compatibility while dramatically improving code organization and maintainability.*
|