// Public Functions ///////////////////////////////
/// <summary>
/// Add a new battleship to the board,
/// such that it's top-left cell is located at the specified coordinate.
/// </summary>
/// <param name="battleship"> The battleship to add to the board. </param>
/// <param name="topLeft"> Where the battleship is to be placed. </param>
/// <returns> </returns>
public bool AddBattleship(Battleship battleship, Coord topLeft)
{
// Since battleships hold state, duplicate references can't be allowed
if (Battleships.Any(b => b.Battleship == battleship))
{
throw new ArgumentException(
"This battleship is already on the board",
nameof(battleship));
}
// Validate location
var location = new BattleshipLocation()
{
Battleship = battleship, TopLeft = topLeft
};
if (!FootprintFitsOnBoard(location))
{
return(false);
}
if (!FootprintUnoccupied(location))
{
return(false);
}
// Place battleship
MarkFootprint(location);
Battleships.Add(location);
return(true);
}
/// <summary>
/// Mark the footprint of the given battleship location as occupied.
/// </summary>
/// <param name="location"> The location to mark the footprint of. </param>
private void MarkFootprint(BattleshipLocation location)
{
foreach (var coord in location.IterateFootprint())
{
Cells[coord.X, coord.Y] = location;
}
}
// Private Functions //////////////////////////////
/// <summary>
/// Check if the entire footprint fits within the boundaries of the board.
/// </summary>
/// <param name="location"> The location to check the footprint of. </param>
/// <returns> True if it fits, else false. </returns>
private bool FootprintFitsOnBoard(BattleshipLocation location)
{
return(location.TopLeft.X >= 0 &&
location.TopLeft.Y >= 0 &&
location.TopLeft.X + location.Battleship.Width <= Width &&
location.TopLeft.Y + location.Battleship.Height <= Height);
}
/// <summary>
/// Construct a new board with the specified dimensions.
/// </summary>
/// <param name="width"> The width of the board, in cells </param>
/// <param name="height"> The height of the board, in cells </param>
public BattleshipBoard(int width = 10, int height = 10)
{
if (width < 1)
{
throw new ArgumentOutOfRangeException(nameof(width),
"Must have positive width");
}
if (height < 1)
{
throw new ArgumentOutOfRangeException(nameof(height),
"Must have positive height");
}
Width = width;
Height = height;
Cells = new BattleshipLocation[width, height];
Battleships = new List <BattleshipLocation>();
}
/// <summary>
/// Check if the entire footprint of the given location is unoccupied.
/// </summary>
/// <param name="location"> The location to check the footprint of. </param>
/// <returns> True if its footprint is clear, else false. </returns>
private bool FootprintUnoccupied(BattleshipLocation location)
{
return(location.IterateFootprint()
.All(coord => Cells[coord.X, coord.Y] == null));
}