Zooming cam by finger gestures

Hello everybody!

I am trying to code a fingergesture: pinching for camera zoom.

It should do following:

• When beginning with the two finger, the cam shpould stay with its original FOV

• when moving finger apart, the cam should zoom out, when moving together, it should zoom in

• when the fingers leave the screen, the zoom should stay

• when touching again, the new zoom is the start of the new and same procedure.

So, it's a simple zoom ... but the cam jumps just in and out with my code:

     if (Input.touchCount == 2 && Input.GetTouch(1).phase == TouchPhase.Began){
     
         var pinchLength : float = Vector2.Distance(Input.GetTouch(0).position, Input.GetTouch(1).position);
 
      }
      
      if(Input.touchCount == 2 && (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)){
         
         var deltaLength : float = Vector2.Distance(Input.GetTouch(0).position, Input.GetTouch(1).position);
         deltaLength = pinchLength - deltaLength;
         deltaLength = deltaLength /90;
         
         camActive.gameObject.GetComponent(camAutoZoom).pinchStrength = deltaLength;
     
     }
 
      if(Input.touchCount == 2 && (Input.GetTouch(0).phase == TouchPhase.Ended || Input.GetTouch(1).phase == TouchPhase.Ended)){
     
         camActive.gameObject.GetComponent(camAutoZoom).actualZoom += deltaLength;
         camActive.gameObject.GetComponent(camAutoZoom).pinchStrength = 0;
         deltaLength = 0;
 
     }

 

And now put together in camAutoZoom-Script with this simple line:

 gameObject.camera.fov =  originalFOV  + actualZoom + pinchStrength;