Readme.md

```
drawing_app/
├── src/
│   ├── main.zig          // 主程序入口
│   ├── canvas.zig        // 画布逻辑
│   ├── tools.zig         // 绘图工具（画笔、橡皮擦等）
│   ├── ui.zig            // UI 组件（颜色选择、工具栏等）
│   └── utils.zig         // 通用工具函数
├── build.zig             // Zig 构建文件
├── assets/               // 静态资源（如图标、默认画布等）
│   └── icon.png
└── README.md


```

# Drawing App

A simple drawing application built with Zig and SDL2, inspired by Windows Paint and Photoshop.

## Features
- Basic brush and eraser tools
- Adjustable brush size
- Color selection (R/G/B)
- Canvas rendering with SDL2

## Requirements
- Zig compiler (0.13.0 or later)
- SDL2 and SDL2_ttf libraries
- A TTF font file in `assets/font.ttf` (e.g., download from Google Fonts)

## Build and Run
1. Install dependencies (see Requirements).
2. Run `zig build run` in the project directory.

## Controls
- Left Mouse: Draw with selected tool
- B: Select Brush
- E: Select Eraser
- +/-: Adjust brush size
- R/G/B: Change color to Red/Green/Blue

## Future Improvements
- Save/load canvas
- Undo/redo
- Layers
- Advanced tools (e.g., selection, fill)