📈 Chart Service

A lightweight Flask microservice that generates chart images from matplotlib Python code. Designed as a companion service for claude-discord-bot.

一個輕量的 Flask 微服務，將 matplotlib Python 程式碼渲染成圖片，作為 claude-discord-bot 的配套服務使用。

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✨ Features / 功能

• 📊 Executes matplotlib Python code and returns a PNG image
• 🔢 Renders LaTeX math formulas as images
• 🚀 Ready to deploy on Railway

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🛠️ Tech Stack

Component	Technology
Web framework	Flask
Chart rendering	matplotlib + numpy + scipy
Server	Gunicorn
Hosting	Railway

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📡 API Endpoints / API 端點

POST /generate

Executes matplotlib Python code and returns a PNG image. 執行 matplotlib Python 程式碼並回傳 PNG 圖片。

Request body:

{
  "code": "import matplotlib.pyplot as plt\nplt.plot([1,2,3],[4,5,6])"
}

Response: PNG image (image/png)

Rules for the code / 程式碼規則：

• Must import at the top
• Do NOT call plt.show()
• Do NOT save files

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POST /latex

Renders LaTeX math formulas as a PNG image. 將 LaTeX 數學公式渲染成 PNG 圖片。

Request body:

{
  "formulas": ["E = mc^2", "\\frac{a}{b}"]
}

Response: PNG image (image/png)

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GET /

Health check — returns Chart service is running!

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🚀 Deployment / 部署

Deploy on Railway / 部署到 Railway

1. Fork this repo
2. Create a new project on Railway and connect the repo
3. Railway will auto-detect the Python service and deploy it
4. Copy the public URL and set it as CHART_SERVICE_URL in your claude-discord-bot environment variables

Run Locally / 本地執行

pip install -r requirements.txt
python app.py

The service will start on http://localhost:8000.

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📁 Project Structure / 專案結構

chart-service/
├── app.py            # Main Flask app / 主程式
├── requirements.txt  # Python dependencies
├── Procfile          # Gunicorn start command
└── railway.toml      # Railway deployment config

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🤝 Contributing / 貢獻

Pull requests are welcome! 歡迎送 PR！

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📄 License

MIT