public static BombsState TickBombs(GameConfigState gameConfigState, BombsState bombsState, PlayerState playerState, AliensState aliensState, AliensFiringInput aliensFiringInput)
{
List <Vector2i> newPositions = bombsState.Positions.Select(position => position + new Vector2i(0, 1)).Where(position => position.Y < gameConfigState.Height).ToList();
if (aliensFiringInput.Fire)
{
newPositions.Add(aliensState.TopLeft + aliensState.RelativePositions[aliensFiringInput.AlienIndex]);
}
return(new BombsState(newPositions));
}
public static RocketsState TickRockets(GameConfigState gameConfigState, RocketsState rocketsState, PlayerState playerState, PlayerInput playerInput)
{
List <Vector2i> newPositions = rocketsState.Positions.Select(position => position + new Vector2i(0, -1)).Where(position => position.Y >= 0).ToList();
if (playerInput == PlayerInput.Fire && newPositions.Count < gameConfigState.MaxRockets)
{
newPositions.Add(new Vector2i(playerState.Position, gameConfigState.Height - 1));
}
return(new RocketsState(newPositions));
}
private static List <int> FindPlayerBombCollisions(GameConfigState gameConfigState, BombsState bombsState, PlayerState playerState)
{
Vector2i playerPosition = new Vector2i(playerState.Position, gameConfigState.Height - 1);
List <int> collisions = bombsState.Positions.Select((position, index) => new Tuple <Vector2i, int>(position, index))
.Where(positionAndIndex => playerPosition == positionAndIndex.Item1)
.Select(positionAndIndex => positionAndIndex.Item2)
.ToList();
return(collisions);
}
public static GameProgressState TickGameProgress(GameConfigState gameConfigState, GameProgressState gameProgressState, AliensState aliensState, int aliensKilled, bool playerCollidedWithBomb)
{
Vector2i topLeft, bottomRight;
aliensState.GetAbsoluteBoundingBox(out topLeft, out bottomRight);
int newScore = gameProgressState.Score + aliensKilled;
int newLives = Math.Max(gameProgressState.Lives - (playerCollidedWithBomb ? 1 : 0), 0);
bool newGameOver = gameProgressState.GameOver || (newLives == 0 || (bottomRight.Y >= gameConfigState.Height));
return(new GameProgressState(newScore, newLives, newGameOver));
}
public static WorldState CreateNewWorldState(int width, int height, int maxRockets, int aliensWidth, int aliensHeight, int initialLives)
{
GameConfigState gameConfigState = new GameConfigState(width, height, maxRockets, aliensWidth, aliensHeight);
PlayerState playerState = new PlayerState(width / 2);
AliensState aliensState = CreateNewAliensState(width, height, aliensWidth, aliensHeight);
AliensMovementState aliensMovementState = new AliensMovementState(AliensMovementState.MovementDirection.Right);
RocketsState rocketsState = new RocketsState(new List <Vector2i>());
BombsState bombsState = new BombsState(new List <Vector2i>());
GameProgressState gameProgressState = new GameProgressState(0, initialLives, false);
WorldState worldState = new WorldState(gameConfigState, playerState, aliensState, aliensMovementState, rocketsState, bombsState, gameProgressState);
return(worldState);
}
public static PlayerState TickPlayer(GameConfigState gameConfigState, PlayerState playerState, PlayerInput playerInput)
{
switch (playerInput)
{
case PlayerInput.MoveLeft:
return(new PlayerState(Math.Max(playerState.Position - 1, 0)));
case PlayerInput.MoveRight:
return(new PlayerState(Math.Min(playerState.Position + 1, gameConfigState.Width - 1)));
default:
return(playerState);
}
}
public WorldState(GameConfigState gameConfigState, PlayerState playerState, AliensState aliensState, AliensMovementState aliensMovementState,
RocketsState rocketsState, BombsState bombsState, GameProgressState gameProgressState)
{
GameConfigState = gameConfigState;
PlayerState = playerState;
AliensState = aliensState;
AliensMovementState = aliensMovementState;
RocketsState = rocketsState;
BombsState = bombsState;
GameProgressState = gameProgressState;
}
public static void TickAliens(GameConfigState gameConfigState, AliensState aliensState, AliensMovementState aliensMovementState,
out AliensState newAliensState, out AliensMovementState newAliensMovementState, out AliensFiringInput newAliensFiringInput)
{
Vector2i topLeft, bottomRight;
aliensState.GetAbsoluteBoundingBox(out topLeft, out bottomRight);
AliensMovementState.MovementDirection nextMovementDirection = ChooseNewAliensMovementDirection(gameConfigState, aliensMovementState, topLeft, bottomRight);
Dictionary <AliensMovementState.MovementDirection, Vector2i> movementDirectionToDelta =
new Dictionary <AliensMovementState.MovementDirection, Vector2i>
{
{ AliensMovementState.MovementDirection.Left, new Vector2i(-1, 0) },
{ AliensMovementState.MovementDirection.Right, new Vector2i(1, 0) },
{ AliensMovementState.MovementDirection.Down, new Vector2i(0, 1) },
};
Vector2i movementDelta = movementDirectionToDelta[nextMovementDirection];
newAliensState = new AliensState(aliensState.TopLeft + movementDelta, aliensState.RelativePositions);
newAliensMovementState = new AliensMovementState(nextMovementDirection);
TickAliensFiring(aliensState, out newAliensFiringInput);
}
private static AliensMovementState.MovementDirection ChooseNewAliensMovementDirection(GameConfigState gameConfigState, AliensMovementState aliensMovementState, Vector2i topLeft, Vector2i bottomRight)
{
switch (aliensMovementState.PreviousMovementDirection)
{
case AliensMovementState.MovementDirection.Left:
if (topLeft.X == 0)
{
return(AliensMovementState.MovementDirection.Down);
}
else
{
return(aliensMovementState.PreviousMovementDirection);
}
case AliensMovementState.MovementDirection.Right:
if (bottomRight.X == gameConfigState.Width)
{
return(AliensMovementState.MovementDirection.Down);
}
else
{
return(aliensMovementState.PreviousMovementDirection);
}
case AliensMovementState.MovementDirection.Down:
if (topLeft.X == 0)
{
return(AliensMovementState.MovementDirection.Right);
}
else
{
return(AliensMovementState.MovementDirection.Left);
}
default:
throw new NotImplementedException();
}
}