Look at touch direction

I have a spaceship that I instantly want to look in the direction of a swipe event (IOS). I have tried several things but nothing works correctly. Here's the latest code I have. Any ideas?

Code (csharp):

1. #pragma strict
2.  
3. var startpos:Vector2;
4. var endpos:Vector2;
5.  
6. function Update () {
7.    for(touch in Input.touches) {
8.     if(Input.GetTouch(0).phase == TouchPhase.Began){
9.         startpos = touch.position;
10.     }
11.     if(Input.GetTouch(0).phase == TouchPhase.Ended){
12.         endpos=touch.position;
13.        
14.         var angleTouch:float=Vector2.Angle(startpos,endpos);
15.  
16.         transform.localEulerAngles.y=angleTouch;
17.         Debug.Log(angleTouch);
18.     }  
19.     //--
20.    }
21.  
22.  //-0-  
23. }

 

Are you sure y is the axis? Other than that, it looks like at touch end, your ship should be rotated on y at that angle to me.

 

Hi !

First, Vector2.Angle will return an absolute value. if you want to get negative value, use this :

Code (csharp):

1. public static float Vector3Angle(Vector3 _from, Vector3 _to) {
2.     return Vector3.Angle(_from, _to) * ((Vector3.Cross(_from, _to).z < 0) ?  -1 : 1);
3. }

Warning, this isn't necessarily z. It can be y.

I don't really see what you wanted to do with this code...

If you want to turn view with a finger movement, you'd better check Input.touch[0].deltaposition.

If you want to turn view with a rotation finger movement, you'd better remember a Vector2 origin is the point (0,0) of the screen. You have to make it relative to the screen Center and so check difference between angles :

Code (csharp):

1. float angle = Vector3Angle(Vector2.up, startpos - new Vector2(Screen.width / 2, Screen.height / 2)) - Vector3Angle(Vector2.up, endpos - new Vector2(Screen.width / 2, Screen.height / 2))

and add it to your localEulerAngles.

If you want to rotate to what your finger is pointing, you can use Transform.LookAt and Camera.ScreenPointToRay

Code (csharp):

1. Transform.lookAt(transform.position + Camera.mainCamera.ScreenPointToRay(Input.touches[0].position).direction);

Hope this helps

Avalion