Bacterium.MainWindow.PointGrid_MouseMove C# (CSharp) Method

        private void PointGrid_MouseMove(object sender, MouseEventArgs e)
        {
            if (!e.LeftButton.Equals(MouseButtonState.Pressed))
                return;
            if (_currentPoint == null)
                return;
            int x = (int)e.GetPosition(PointGrid).X - MyPoint.WIDTH / 2;
            int y = (int)e.GetPosition(PointGrid).Y - MyPoint.HEIGHT / 2;
            if (x < _currentPoint.X || x > _currentPoint.X + MyPoint.WIDTH ||
                y < _currentPoint.Y || y > _currentPoint.Y + MyPoint.HEIGHT)
            {
                Cell tmp = _currentPoint.CurrentCell;
                _currentPoint.SetNewLocation(tmp.X, tmp.Y);
            }
            _currentPoint.SetNewLocation(x, y);
        }