Using touch to rotate around an object

I've been trying to have my camera rotate around an object using screen touch.
I haven't been successful so far though I have based my script on the MouseOrbit script that comes with unity.
Would appreciate if some can give tips of hints on how to do this.

Sorry if the formatting so off, I'm posting from my iPhone.

 

here is how I finally implemented it:

Code (csharp):

1.  
2. var target : Transform;
3. var distance = 10.0;
4.  
5. var xSpeed = 250.0;
6. var ySpeed = 120.0;
7.  
8. var yMinLimit = -20;
9. var yMaxLimit = 80;
10.  
11. private var x = 0.0;
12. private var y = 0.0;
13.  
14. var xsign =1;
15.  
16. @script AddComponentMenu("Camera-Control/Mouse Orbit")
17.  
18. function Start () {
19.     var angles = transform.eulerAngles;
20.     x = angles.y;
21.     y = angles.x;
22.    
23.     var rotation = Quaternion.Euler(y, x, 0);
24.     var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
25.        
26.         transform.rotation = rotation;
27.         transform.position = position;
28.  
29.    
30. }
31.  
32. function LateUpdate () {
33.    
34.    
35.     //get the rotationsigns
36.    
37.     var forward = transform.TransformDirection(Vector3.up);
38.     var forward2 = target.transform.TransformDirection(Vector3.up);
39.      if (Vector3.Dot(forward,forward2) < 0)
40.             xsign = -1;
41.             else
42.             xsign =1;
43.    
44.    
45.     for (var touch : Touch in Input.touches) {
46.     if (touch.phase == TouchPhase.Moved) {
47.         x += xsign * touch.deltaPosition.x * xSpeed *0.02;
48.         y -= touch.deltaPosition.y * ySpeed *0.02;
49.        
50.        
51.                
52.         var rotation = Quaternion.Euler(y, x, 0);
53.         var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
54.        
55.         transform.rotation = rotation;
56.         transform.position = position;
57.     }
58.     }
59. }
60.  
61.  
62.  

 

Thank you, that's useful

 

@Hesham
I'm also interested in this topic. Would you like to explain more? or write a short tutorial for me please!

 

This is exactly what i am looking for. Thank you Hesham. But, unfortunately i can not implement this. There is no error message when i run. Do i need to add some package to use this script?

Thanks again.

Regards.

 

Thanks Hesham you just made my day

 

i need to change the code to Touch the object, to rotate, how can i figure that. thanks...