How to check where a player can go?

Question

C++ / C#

There is a method

CalculateMoveVariant()

, it should fill the sheet with all possible options for the move.

Sheet:

private List<Cell> _moveVariants = new List<Cell>();

The Cell class has a Vector2 Position field (stores x, y values. You can add vectors and do whatever you want)

There is a grid where the position is indicated and each cell has a position.

The player is in a cell with position x: 4, y: 4 (The grid is ten by ten, so the player is in the middle).

There are two variables:

private int _horizontalCellMove;
    private int _verticalCellMove;

They mean how many horizontal/vertical cells the player can move.

That is, if there were values ​​1 and 1,

then the player could move one cell horizontally forward / backward and one cell vertically forward / backward.

How to calculate where he can go knowing the position, the number of cells that the player can move and the fact that the field is not infinite?