为常见图书管理系统增添新功能

本次小组项目在经过对常见图书馆系统的分析后中，我们提出了两个新功能：位置相关搜索和AR室内导航。

1.Indoor-navigation

To help users reach the shelf where the book they are looking for.

1. Click the "Location" button on the specific book interface

2. The system displays the location of the book in the library on the map

3. Click the "Navigate" button 

4. The system takes the position of the book as the endpoint and  marks  the user‘s direction in real-time with arrows according to the first-person perspective

5. Click "Voice Navigation" 

6. The system uses voice to indicate the user's direction in real-time

7. The user arrives at the locations of the book 

8. The system stops navigation and displays the end of navigation.

2.Position-Related Search

•Users can get an ordered list of copies that they can find from the nearest library to the furthest library.

1. User opens GPS service  

2. The system displays the position information of the user.

3. User sets the position filter  

4. The system receives the position filter user set.

5. Search for a book  

6. The system returns a list of items sorted according to the filter.

3.Use case Diagram （Indoor Navigation）

4.UsecaseDiagram (Location Related Search)

5.Class Diagrams

6.Sequence Diagrams（Position-related search）

7.Sequence Diagrams（The Indoor-navigation for user）

8.Sequence Diagrams（The Indoor-navigation for manager）