Top-down character running animation based on facing direction

Hi there,

I have a character containing animations for running - forwards, backwards, strafe left and strafe right. I have all of the controls set up correctly (i.e. he looks at where the mouse is and transforms appropriately based on WSAD input), but I need some help with playing the right running animation based on which way the character is facing and moving. I've set up a 2D free form Cartesian in Mecanim - can anyone help point me in the right direction?

Here is my moving and rotating code:

     void UpdateControls()
         {
             _moveInput = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
             _moveDir = Camera.main.transform.TransformDirection(_moveInput);
             _moveDir.y = 0;
      
             _r.velocity = _moveDir.normalized * _speed * Time.deltaTime;
      
      
         }
      
         void UpdatePlayerDirection()
         {
             Ray _ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             RaycastHit _hit;
      
             if (Physics.Raycast(_ray, out _hit, 1 << 8))
             {
                 Vector3 _mousePoint = new Vector3(_hit.point.x, 0, _hit.point.z);
                 _charTransform.LookAt(_mousePoint);
             }
         }
 

Many thanks