# Derail Valley Community Map with Catenary DC Layer

Interactive vector web map of Derail Valley railway network with DC electrification infrastructure overlay (Catenary-DC / WE6SIM mod).

## Architecture & Stack
- **Frontend**: Vanilla ES6 modules, HTML5 Canvas 2D (double-buffered with dynamic overlay).
- **Coordinate System**: Game engine coordinates (meters), origin at bottom-left, mapped via `Matrix` and `View` transforms.
- **Datasets**:
  - `catenary_dv.json`: 164 chained polylines (optimized from 3,751 segments), 9 traction substations, 5 neutral sections, 34 interruption clusters, 129 warning signs.
  - `trackdata_dv.json`: Rail tracks (cubic Bézier curves) and junction points.
  - `poi_dv.json`: Stations, offices, service tracks, turntables, landmarks.
  - `shop_items.json`: Shop inventories and prices.

## Catenary Layer Features
- **Wire Suspension Rendering**:
  - `Single` (6.0m, 1500V/750V): standard solid vector line.
  - `Dual` (6.0m, 1500V): high-capacity twin catenary stroke.
  - `Quad` (6.0m, 1500V): heavy 4-wire mountain pass stroke with dark border.
  - `Trolley` (6.0m, 750V): fine yard wire.
  - `Side Rail` (4.5m, 1000V): dashed 3rd contact rail at IME and SM mine tracks.
  - `Neutral Sections` (0V): contrasting red-and-white dashed lines with `0V` danger badges.
- **Color Modes**:
  - `Voltage`: 1500V DC (`#00d2ff`), 1000V DC (`#ff9f1c`), 750V DC (`#2ec4b6`), 0V Neutral (`#e63946`).
  - `Substation`: Distinct color per feeding substation (CME/IME1500, CP750, FF1500, HB1500, IME1000, IMW1500, OR750, SM1500, SM1000).
  - `Wire Type`: Color-coded by physical suspension category.
- **Markers & Tooltips**:
  - Traction Substations: `⚡` badge with nominal voltage, supply voltage, max load (kW), and regenerative inverter presence.
  - Neutral Sections: `⛔` badge with section ID, length, connecting substations, and disconnect traction warning.
  - Interruption Signs: `⤓` diamond badge for pantograph drop/raise warnings.
  - Contact Wires: Nearest-point hovering displaying voltage, substation feed, category, and segment length.

## CommunityMapLocation Mod Integration

### Bug Fixes
1. **Rotation Desync**: `LocationResponse` accepts `rotationTransform` from locomotive transform or camera heading (fixing player orientation desync).
2. **URL Formatting**: Fixed string immutability bug in `address.replaceAll` inside `connectPlayerLocation`.

### CORS Configuration
In `<GameDirectory>/Mods/CommunityMapLocation/Settings.xml`:
```xml
<Settings>
  <Port>9090</Port>
  <RequestSourceType>Any</RequestSourceType>
  <RequestSource>http://localhost:8080</RequestSource>
</Settings>
```
*Note: If `RequestSourceType` is `Any`, the game mod allows cross-origin requests from any web host (localhost, GitHub Pages, Gitea).*

## CI/CD Workflows
- **Gitea Actions** (`.gitea/workflows/deploy.yaml`): JSON dataset validation, JS syntax verification, artifact packaging with `actions/upload-artifact@v3`, releases with `akkuman/gitea-release-action@v1`.
- **GitHub Pages** (`.github/workflows/deploy-pages.yml`): Automated GitHub Pages deployment on push to `main`.