# traffic_light

**Repository Path**: babytech/traffic_light

## Basic Information

- **Project Name**: traffic_light
- **Description**: 红绿灯演示程序
- **Primary Language**: Python
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-11-01
- **Last Updated**: 2025-03-08

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Traffic Light Simulation Program

A Pygame-based traffic light simulation program demonstrating vehicle and pedestrian movement under traffic light control.

## Features

- 🚦 Realistic traffic light cycles (Green: 5s/Yellow: 1.5s/Red: 9.5s)
- 🚗 5 different colored vehicle simulations
- 🚶 Doraemon-themed pedestrian animation
- 🖥️ 60FPS smooth animation
- 🎮 Interactive start menu (Play/Exit buttons)

## Program Structure

```python
main.py
├── Global variables (window size, colors, states)
├── MoveObject class (moving object logic)
├── light_thread function (traffic light control thread)
├── Button class (UI button component)
├── starting_screen function (start interface)
└── Main program (resource loading, object initialization, main loop)
```

## Core Logic

### Traffic Light Cycle Control
```python:main.py
Lines 132-149
# Traffic light state switching logic
if count < 1000:
    current_color = "green"
elif count < 1300:
    current_color = "yellow"
elif count < 3200:
    current_color = "red"
else:
    count = 0
```

### Moving Object Control
```python:main.py
Lines 35-100
class MoveObject:
    def update(self, signal_color):
        # Vehicle control logic (move on green, decelerate otherwise)
        # Pedestrian control logic (move on red, stop otherwise)
```

## Requirements

- Python 3.6+
- Pygame 2.0+
- Resource files directory `resource/`

## Usage

1. Install dependencies
```bash
pip install pygame
```

2. Run program
```bash
python main.py
```

## Interface Description

- Start screen: Centered Play/Exit buttons
- Main interface elements:
  - Dynamic road background
  - Real-time traffic light display
  - Vehicle and pedestrian animations
  - 60FPS frame rate control

## Control Rules

| Signal | Vehicle Behavior     | Pedestrian Behavior  |
|--------|----------------------|----------------------|
| 🟢 Green | Normal passage      | Wait at crosswalk   |
| 🟡 Yellow | Decelerate to stop line | Prepare to move     |
| 🔴 Red | Complete stop       | Cross normally      |