//MouseDown function first checks the Current State and if it is on move it gets the first touch position
//and calls ClosestTiles function from TileBehavior Class.
public void MouseDown(TileBehavior tile)
{
if (board.currentState == GameState.move)
{
firstTouchPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
tile.ClosestTiles();
}
}