Scale Transform Axes (Non-uniform) With Pinch

Hi all,

I'm trying to scale a transform axes non-uniformly with pinch gesture. At the moment I've managed to do it uniformly by pinching anywhere on the screen, but I want it to scale in the x, y or z dependant on where you pinch around the gameobject.

So for instance if your fingers were to start diagonally to the gameobject and you were to pinch outwards the gameobject would increase scale both in the x and y (see image below) and visa-versa if you were to move them inwards. Futhermore, if your fingers were to start perfectly vertical to the gameobject it would only scale in the y axis.

I'm guessing I need to get the dot product between the gameobject transform and the vector between finger 1 and 2 and based on that scale in the different axes, but I'm not sure if this is the best way to go about it. Note, we can disregard the z axis for this question.

Any help would be most appreciated.

Here's my code so far (which does uniform scale):

 if(Input.touchCount == 2)
 {
     float deltaMagnitudeDiff = 0f;
 
     // Store both touches.
     Touch touchZero = Input.GetTouch(0);
     Touch touchOne = Input.GetTouch(1);
 
     // Find the position in the previous frame of each touch.
     Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
     Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;
 
     // Find the magnitude of the vector (the distance) between the touches in each frame.
     float prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).sqrMagnitude;
     float touchDeltaMag = (touchZero.position - touchOne.position).sqrMagnitude;
 
     deltaMagnitudeDiff = -(prevTouchDeltaMag - touchDeltaMag) * 0.1f;
 
     transform.localScale = Vector3.Lerp(transform.localScale, transform.localScale * deltaMagnitudeDiff, Time.deltaTime);
 }