Unity location service GPS API

Unity Use GPS Of API

stay unity In the official documents of , And equipment positioning （GPS Longitude and latitude 、 Horizontal accuracy, etc ） dependent API, So far I have only found two ：LocationService and LocationInfo .

Let's have a simple understanding ：

LocationService  Be responsible for starting and closing the location service .

LocationInfo  After the service starts , Get location data information .

LocationService

Official description link ：

http://docs.unity3d.com/Documentation/ScriptReference/LocationService.Start.html

LocationService There are three attributes in , And two ways ：

（1）isEnabledByUser   -- Whether the location service in the user settings is enabled .（ The measured found , All for true, It doesn't seem to work ）

（2）lastData   -- The geographical location of the last measurement （LocationInfo lastData; That is to say, with LocationInfo Associated with the ）

（3）status   -- Status of the location service .

The status of the location service includes ：

Stopped
Location service is stopped. The location service has stopped
Initializing
Location service is initializing, some time later it will switch to.  The location service is initializing , After a period of time , The state will switch back .
Running
Location service is running and locations could be queried.  The location service is running , The location can be obtained .
Failed
Location service failed (user denied access to location service).  Location service failed （ The user denied access to the location service ）.

（4）Start ( )   -- Start location service , Update positioning data . You can get the latest updated position coordinates .

     Data reception , It's through Input.location.lastData To achieve . Services can't get location data right away . The code must be checked Input.location.status To get the current location service status .

Take a look at the function definition ：

void Start(float desiredAccuracyInMeters = 10f, float updateDistanceInMeters = 10f); 

Parameters, ：

desiredAccuracyInMeters  The precision required for the service , In meters . If higher value , such as 500, Then you usually don't need to open GPS chip （ For example, the signal base station can be used for triangulation ）, This saves battery power . image 5-10 So the value of the , Can be used to obtain the best accuracy . The default value is 10 rice .

updateDistanceInMeters   Minimum distance （ In meters ） The equipment must be moved laterally before Input.location Property is updated . Higher values , Such as 500 Means less overhead . The default value is 10 rice .

（5）Stop ( )  -- Stop the location update of the location service . This is very useful for saving battery power .void

LocationInfo

Properties are as follows ：

（1） altitude -- Altitude  

（2） horizontalAccuracy -- Horizontal accuracy

（3） latitude -- latitude

（4） longitude -- longitude

（5） timestamp -- Timestamp of the last location , from 1970 Start

（6） verticalAccuracy -- Vertical accuracy

These attributes , except timestamp by double Outside , The rest are all float type .

Here is Unity Use GPS Example

1, Create a new project .

2, Write a script GetGPS.cs , Hang it on the main camera .

[csharp] view plain copy

1. using UnityEngine;  
2. using System.Collections;  
3.   
4. public class GetGPS : MonoBehaviour {  
5.   
6.     public string gps_info = "";  
7.     public int flash_num = 1;  
8.   
9.     // Use this for initialization  
10.     void Start () {  
11.       
12.     }  
13.       
14.     void OnGUI () {  
15.         GUI.skin.label.fontSize = 28;  
16.         GUI.Label(new Rect(20,20,600,48),this.gps_info);   
17.         GUI.Label(new Rect(20,50,600,48),this.flash_num.ToString());   
18.           
19.         GUI.skin.button.fontSize = 50;  
20.         if (GUI.Button(new Rect(Screen.width/2-110,200,220,85),"GPS location "))  
21.         {  
22.             //  Here you need to start a collaboration program   
23.             StartCoroutine(StartGPS());  
24.         }  
25.         if (GUI.Button(new Rect(Screen.width/2-110,500,220,85)," Refresh GPS"))  
26.         {  
27.             this.gps_info = "N:" + Input.location.lastData.latitude + " E:"+Input.location.lastData.longitude;  
28.             this.gps_info = this.gps_info + " Time:" + Input.location.lastData.timestamp;  
29.             this.flash_num += 1;   
30.         }  
31.     }  
32.   
33.     // Input.location = LocationService  
34.     // LocationService.lastData = LocationInfo   
35.   
36.     void StopGPS () {  
37.         Input.location.Stop();  
38.     }  
39.   
40.     IEnumerator StartGPS () {  
41.         // Input.location  Used to access the location properties of the device （ Handheld devices ）,  Static LocationService Location   
42.         // LocationService.isEnabledByUser  Whether the location service in the user settings is enabled   
43.         if (!Input.location.isEnabledByUser) {  
44.             this.gps_info = "isEnabledByUser value is:"+Input.location.isEnabledByUser.ToString()+" Please turn on the GPS";   
45.             return false;  
46.         }  
47.   
48.         // LocationService.Start()  Start the update of the location service , The last position coordinate will be used   
49.         Input.location.Start(10.0f, 10.0f);  
50.   
51.         int maxWait = 20;  
52.         while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0) {  
53.             //  Pause the execution of the collaboration program (1 second )  
54.             yield return new WaitForSeconds(1);  
55.             maxWait--;  
56.         }  
57.   
58.         if (maxWait < 1) {  
59.             this.gps_info = "Init GPS service time out";  
60.             return false;  
61.         }  
62.   
63.         if (Input.location.status == LocationServiceStatus.Failed) {  
64.             this.gps_info = "Unable to determine device location";  
65.             return false;  
66.         }   
67.         else {  
68.             this.gps_info = "N:" + Input.location.lastData.latitude + " E:"+Input.location.lastData.longitude;  
69.             this.gps_info = this.gps_info + " Time:" + Input.location.lastData.timestamp;  
70.             yield return new WaitForSeconds(100);  
71.         }  
72.     }  
73. }  

3, Export to mobile phone , function , You can see the effect .

Transfer to ：http://blog.csdn.net/chenggong2dm/article/details/24488469