Android multitouch issue.

Hello everyone,

I am currently working on simple input gesture script. One of the features is zoom in and zoom out (pinch gesture).
I have the following script based on several examples found on the Internet:

Code (CSharp):

1. void Update () {
2.         if (Input.touchCount == 2)
3.         {
4.             if(Input.GetTouch(0).phase == TouchPhase.Moved && Input.GetTouch(1).phase ==      TouchPhase.Moved)  
5.             {
6.                 curDist = Input.GetTouch(0).position - Input.GetTouch(1).position;
7.                 prevDist = ((Input.GetTouch(0).position - Input.GetTouch(0).deltaPosition) - (Input.GetTouch(1).position - Input.GetTouch(1).deltaPosition));
8.                 touchDelta = curDist.magnitude - prevDist.magnitude;
9.                 speedTouch0 = Input.GetTouch(0).deltaPosition.magnitude / Input.GetTouch(0).deltaTime;
10.                 speedTouch1 = Input.GetTouch(1).deltaPosition.magnitude / Input.GetTouch(1).deltaTime;
11.              
12.              
13.                 if ((touchDelta + varianceInDistances <= -10) && (speedTouch0 > minPinchSpeed) && (speedTouch1 > minPinchSpeed))
14.                 {
15.                     StartCoroutine("ZoomIn");
16.                 }
17.              
18.                 if ((touchDelta +varianceInDistances > 10) && (speedTouch0 > minPinchSpeed) && (speedTouch1 > minPinchSpeed))
19.                 {
20.                     StartCoroutine("ZoomOut");
21.                 }
22.             }
23.          
24.         }
25. }

While I am debugging an app via Unity Remote 4 everything works perfect. The problems start when I build the application and then install it on the smartphone. After run I tried to check it out but nothing happens. This script does not work. I have checked does multitouch work properly - I have added a Text displays an information about touchCount so the condition:

Code (CSharp):

1. Input.touchCount == 2

should return true. Could anyone help with this stuff? I would be really thankful...

 

I'll assume you have Coroutines named ZoomIn and ZoomOut somewhere and that those routines (if called explicitly from a test case) work properly.

The code you have above is a bit fiddly by requiring that both touch0 and touch1 need to be moving. I would make it so that at least one of them must be moving, and the other may be moving or stationary. That is what a pinch gesture usually can be: one finger fixed, the other moving relative.

 

Thanks for posting and sorry for my delay...

Yes, those Coroutines work perefectly in Unity Remote. I mean my smartphone gets multitouch data properly but after real app installation 'zoom in' and 'zoom out' gestures don't work. I have also rotation gestures like:

Code (CSharp):

1. if(Input.touchCount == 1)
2.         {
3.             Touch myTouch = Input.touches[0];
4.             if(myTouch.phase == TouchPhase.Began)
5.             {
6.                 touchOrigin = myTouch.position;
7.             }
8.             else if(myTouch.phase == TouchPhase.Ended && touchOrigin.x >= 0)
9.             {
10.                 Vector2 touchEnd = myTouch.position;
11.                 float x = touchEnd.x - touchOrigin.x;
12.                 float y = touchEnd.y - touchOrigin.y;
13.  
14.                 if(Mathf.Abs(x) > Mathf.Abs(y))
15.                 {
16.                     if(x > 100)
17.                         StartCoroutine("RotateLeft");
18.                     else if(x < -100)
19.                         StartCoroutine("RotateRight");
20.                     touchOrigin = touchEnd;
21.                 }
22.             }
23.         }    

but those work fine in both cases. I have problem only with zoom gestures...

Good point, thanks. I considered it and fixed my script unsuccesfully, zooms still aren't working... Do you have any ideas?

 

Bump, any suggestions ?

 

Everything looks fine from what I see above. At this point you're probably going to have to write a little logger that outputs each touch gesture to the screen in a scrolling list... pretty sure someone made one of those somewhere on the Unity wiki or something. Just display x, y and touch phase for each touch that exists in any given frame and you should begin to see where the problem might be.