🖌️ Mini CAD App

A browser-based Mini CAD (Computer-Aided Design) app built from scratch with a Node.js backend and HTML5 canvas frontend. It supports drawing lines, rectangles, circles, squiggles, and erasing — along with undo/redo, tabbed boards, and image exporting.

Live Demo: Mini CAD App
Backend API: Render Deployment

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🌐 Features

✏️ Drawing Tools

• Line, Rectangle, Circle, Freehand (Squiggle), Eraser

🎨 UI Controls

• Color Picker
• Brush Size Slider
• Undo & Redo
• Clear Board
• Export Canvas as PNG
• Multiple Boards (Tabs)

🔁 Data Persistence

• Shape data is saved per board to a Node/Express backend
• Shapes are automatically reloaded when switching boards

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🧠 Tech Stack

Layer	Technology
Frontend	HTML, CSS, JavaScript (Vanilla)
Backend	Node.js, Express.js
Deployment	GitHub Pages (frontend) + Render (backend)
Data Store	In-memory object per board

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🚀 Setup Instructions

🔧 Backend (Node.js + Express)

1. Clone backend repo:

   git clone https://github.com/rowangs/cad-backend
   cd cad-backend
   npm install
   node index.js