# HPGL Plotter Web UI

Flask web interface for uploading HPGL files, previewing and transforming them (flip, rotate, scale, center), and sending to the plotter. Intended to run on a Raspberry Pi connected to the plotter via USB.

## Setup (Raspberry Pi / Linux Mint / Debian)

From the **project root** (mimaki/), install dependencies. On Debian-based systems Python is externally managed (PEP 668), so use:

```bash
pip install --break-system-packages -r webui/requirements.txt
```

Then copy `config.example.ini` to `config.ini` and set the plotter port etc. (optional).
   ```bash
   cp config.example.ini config.ini
   ```
   Edit `config.ini` to set the plotter port (e.g. `/dev/ttyUSB0`) and optionally web UI port/host.

## Run

From the **project root** (mimaki/):

```bash
python webui/app.py
```

Then open http://localhost:5000 (or http://<raspi-ip>:5000 from another device). Host is `0.0.0.0`, port 5000 (see `config.ini`).

For production with gunicorn: `pip install --break-system-packages gunicorn` then `gunicorn -w 1 -b 0.0.0.0:5000 "webui.app:app"`.

## Usage

**File tab**
1. **Upload** – Choose an `.hpgl` or `.plt` file. It is validated and stored in `webui/uploads/`.
2. **Preview** – The drawing is converted to SVG and shown in the browser.
3. **Transform** – Flip, Rotate 90° / 180°, Scale + / −, Center, Scale to bounds. Each action updates the stored program and the preview.
4. **Print** – Sends the current (transformed) program to the plotter: scale to fit, center, then write HPGL to serial.

**Text tab**
1. Type text, select a font (from `font/` or `.git/font/`, e.g. `Melange-Bold.otf`), set size (pt), then **Generate HPGL**.
2. The generated HPGL becomes the current program; use the same **Preview**, **Transform**, and **Print** as in the File tab.

Fonts: put `.otf` or `.ttf` files in the project `font/` folder (or they are read from `.git/font/` if present). The Text tab requires **matplotlib** (`pip install matplotlib`).

## API

- `POST /api/upload` – Upload HPGL file (form field `file`).
- `GET /api/svg` – Get current program as SVG (query: `width`, `height`).
- `POST /api/transform` – Body: `{"action": "flip"|"rotate"|"scale"|"centralize", "angle": 90, "factor": 1.25}`.
- `POST /api/print` – Send current program to plotter.
- `GET /api/status` – `has_file`, `filename`, `plotter_ready`.

Session is used to keep the current file path; no database.