# japan-map-selector
Interactive Japan map component for selecting prefectures and municipalities. Built with TypeScript and supports React, Svelte, and vanilla JavaScript.
[日本語版はこちら](#日本語)
## Features
- 🗾 Interactive map of Japan with all prefectures
- 🏘️ Drill-down to municipality level selection
- 🎨 Multiple themes (default, dark, colorful)
- ⚡ Framework agnostic - works with React, Svelte, or vanilla JS
- 📱 Responsive and touch-friendly
- 🗜️ Adjustable simplification levels for performance
- 🔄 Grid and hexagonal deformation modes
- 🏝️ Special handling for Tokyo islands
- 📍 Okinawa displayed in separate inset
## Demo
- 📚 [Documentation](https://northprint.github.io/japan-map-selector/) (After GitHub Pages is enabled)
- 🎮 [Live Demo](https://northprint.github.io/japan-map-selector/demo) (After GitHub Pages is enabled)
To run the demo locally:
```bash
# Start a local server
python3 -m http.server 8000
# or
npx http-server -p 8000
# Open http://localhost:8000/demo.html
```
## Installation
```bash
npm install japan-map-selector
```
## Quick Start
### Vanilla JavaScript
```javascript
import { JapanMapSelector } from 'japan-map-selector';
// セレクターを作成
const selector = new JapanMapSelector({
width: 800,
height: 600,
onPrefectureSelect: (prefecture) => {
console.log('Selected prefecture:', prefecture.name);
},
onMunicipalitySelect: (municipality) => {
console.log('Selected municipality:', municipality.name);
}
});
// データを読み込んで初期化
// CDN経由でデータを読み込む場合（推奨）
const baseUrl = 'https://unpkg.com/japan-map-selector@latest/src/data/simplified';
await selector.initialize(
`${baseUrl}/prefectures-medium.geojson`,
`${baseUrl}/municipalities-medium.geojson`
);
// SVGコンテンツを取得して表示
const svgElement = document.getElementById('map-svg');
selector.on('stateChanged', (state) => {
svgElement.innerHTML = state.svgContent;
});
```
完全な実装例は [examples/vanilla-js/](examples/vanilla-js/) を参照してください。
### CDN Usage
```html
Japan Map Selector - CDN Example
```
### React
```jsx
import { JapanMapSelectorReact } from 'japan-map-selector';
function MapComponent() {
const handlePrefectureSelect = (prefecture) => {
console.log('Selected:', prefecture.name);
};
return (
);
}
```
### Svelte
```svelte
```
## Map Data
This package includes map data derived from the National Land Numerical Information (国土数値情報) provided by the Ministry of Land, Infrastructure, Transport and Tourism of Japan.
### Default Data (Included)
The package includes medium precision data by default:
- Prefecture boundaries: 272KB
- Municipality boundaries: 2.0MB
- **Total size: ~2.3MB**
### Using Default Data
The default medium precision data is automatically included. You can use relative paths:
```javascript
// Using default data (medium precision)
await map.initialize(
'./node_modules/japan-map-selector/src/data/simplified/prefectures-medium.geojson',
'./node_modules/japan-map-selector/src/data/simplified/municipalities-medium.geojson'
);
```
Or with a bundler that resolves node_modules:
```javascript
import prefectureData from 'japan-map-selector/src/data/simplified/prefectures-medium.geojson';
import municipalityData from 'japan-map-selector/src/data/simplified/municipalities-medium.geojson';
await map.initialize(prefectureData, municipalityData);
```
### Optional Data Packages
For other precision levels, install additional packages:
| Package | Install Command | Total Size | Use Case |
|---------|----------------|------------|----------|
| Original (Highest) | `npm install japan-map-selector-data-original` | ~10.7MB | Detailed analysis |
| High | `npm install japan-map-selector-data-high` | ~4.1MB | Better quality |
| Low | `npm install japan-map-selector-data-low` | ~1.3MB | Mobile apps |
| Ultra Low | `npm install japan-map-selector-data-ultra-low` | ~696KB | Previews |
**Note: These optional packages are not yet published. For now, only medium precision data is available.**
## Performance Optimization
### Option 1: Use Low Precision Data
For faster initial load times, use low precision data:
```javascript
// Use low precision data (60% smaller, loads 2-3x faster)
await map.initialize(
'https://unpkg.com/japan-map-selector@latest/src/data/simplified/prefectures-low.geojson',
'https://unpkg.com/japan-map-selector@latest/src/data/simplified/municipalities-low.geojson'
);
```
Benefits:
- **File size**: ~1.3MB (vs 2.3MB for medium precision)
- **Initial load**: 1-2 seconds (vs 3-5 seconds)
- **Cached load**: 0.1-0.3 seconds
- **Visual quality**: Good for most use cases
### Option 2: Dynamic Prefecture-based Loading (v0.2.0+)
Load municipality data only when a prefecture is selected:
```javascript
const selector = new JapanMapSelector({
width: 800,
height: 600,
enableDynamicLoading: true, // Enable dynamic loading
dynamicDataBaseUrl: 'https://unpkg.com/japan-map-selector@latest/src/data',
onMunicipalityLoadStart: (prefecture) => {
console.log(`Loading ${prefecture.name} municipalities...`);
},
onMunicipalityLoadEnd: (prefecture) => {
console.log(`Loaded ${prefecture.name} municipalities`);
}
});
// Initialize with prefecture data only
await selector.initialize(
'https://unpkg.com/japan-map-selector@latest/src/data/simplified/prefectures-low.geojson',
'' // Municipality URL can be empty with dynamic loading
);
```
Benefits:
- **Initial load**: ~100KB (prefectures only)
- **Per-prefecture load**: 10-200KB (on demand)
- **Total bandwidth**: Only loads what's needed
- **Memory efficient**: Unloaded data doesn't consume memory
## API Reference
### Options
```typescript
interface JapanMapSelectorProps {
width?: number; // Map width (default: 800)
height?: number; // Map height (default: 600)
theme?: string | ColorTheme; // Theme name or custom theme object
simplificationLevel?: number; // 0.1 (detailed) to 1.0 (simplified)
showTokyoIslands?: boolean; // Show/hide Tokyo remote islands
enableZoom?: boolean; // Enable zoom functionality
enablePan?: boolean; // Enable pan functionality
}
```
### Events
- `prefectureSelected` - Fired when a prefecture is selected
- `municipalitySelected` - Fired when a municipality is selected
- `selectionCleared` - Fired when selection is cleared
### Methods
- `setTheme(theme)` - Change the color theme
- `setSimplificationLevel(level)` - Adjust map detail level
- `setDeformMode(mode)` - Set deformation mode ('none', 'grid', 'hexagon')
- `reset()` - Reset to initial view
- `selectPrefecture(code)` - Programmatically select a prefecture
- `zoomIn()` / `zoomOut()` - Zoom controls
## Themes
Built-in themes:
- `default` - Clean, minimalist design
- `dark` - Dark mode
- `colorful` - Vibrant colors
Custom theme example:
```javascript
const customTheme = {
background: '#f0f0f0',
prefectureFill: '#ffffff',
prefectureStroke: '#333333',
prefectureHoverFill: '#ffff00',
municipalityFill: '#e0e0e0',
municipalityStroke: '#666666',
strokeWidth: 0.5
};
selector.setTheme(customTheme);
```
## Examples
See the `examples/` directory for complete examples:
- Basic usage with vanilla JavaScript
- React integration with hooks
- Svelte component with reactive data
- Custom theming and data visualization
## Development
```bash
# Install dependencies
npm install
# Start development server
npm run dev
# Build the library
npm run build
# Run type checking
npm run type-check
# View documentation
npm run docs:dev
```
## Browser Support
- Chrome (latest)
- Firefox (latest)
- Safari (latest)
- Edge (latest)
## License
MIT License - see LICENSE file for details.
## Attribution
This library uses map data from:
- National Land Numerical Information (国土数値情報) by MLIT Japan
- [Attribution details](./ATTRIBUTION.md)
---
# japan-map-selector (日本語版)
日本の都道府県・市区町村を選択できるインタラクティブな地図コンポーネント。TypeScriptで構築され、React、Svelte、vanilla JavaScriptをサポート。
## 特徴
- 🗾 全都道府県を含む日本のインタラクティブマップ
- 🏘️ 市区町村レベルまでドリルダウン可能
- 🎨 複数のテーマ（デフォルト、ダーク、カラフル）
- ⚡ フレームワーク非依存 - React、Svelte、vanilla JSで動作
- 📱 レスポンシブでタッチ操作対応
- 🗜️ パフォーマンスのための簡略化レベル調整可能
- 🔄 グリッド・六角形のデフォルメモード
- 🏝️ 東京都の離島の特別な処理
- 📍 沖縄県を別枠で表示
## インストール
```bash
npm install japan-map-selector
```
## 使用例
[上記の英語版を参照](#quick-start)
## 地図データ
本パッケージには、国土交通省国土数値情報ダウンロードサービスから提供されている行政区域データを加工したものが含まれています。
## ライセンス
MIT License
## 謝辞
地図データの提供元：
- 国土交通省 国土数値情報（行政区域データ）
- [詳細な帰属情報](./ATTRIBUTION.md)