private static AliensState ResolveAlienCollisions(AliensState aliensState, List <Tuple <int, int> > alienRocketCollisions)
{
if (alienRocketCollisions.Count != 0)
{
List <Vector2i> remainingPositions = aliensState.RelativePositions.Where((position, index) => !alienRocketCollisions.Exists(collision => index == collision.Item1)).ToList();
return(new AliensState(aliensState.TopLeft, remainingPositions));
}
else
{
return(aliensState);
}
}
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 void TickAliensFiring(AliensState aliensState, out AliensFiringInput newAliensFiringInput)
{
Random r = new Random();
if (r.Next(10) == 0)
{
List <int> bottomRow = aliensState.GetBottomRow();
newAliensFiringInput = new AliensFiringInput(true, bottomRow[r.Next(bottomRow.Count)]);
}
else
{
newAliensFiringInput = new AliensFiringInput(false, 0);
}
}
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;
}
private static List <Tuple <int, int> > FindAlienRocketCollisions(AliensState aliensState, RocketsState rocketsState)
{
List <Tuple <int, int> > collisions = new List <Tuple <int, int> >();
for (int rocketIndex = 0; rocketIndex < rocketsState.Positions.Count; rocketIndex++)
{
Vector2i rocketPosition = rocketsState.Positions[rocketIndex];
int alienIndex = aliensState.RelativePositions.FindIndex(alienRelativePosition => (alienRelativePosition + aliensState.TopLeft) == rocketPosition);
if (alienIndex != -1)
{
collisions.Add(new Tuple <int, int>(alienIndex, rocketIndex));
}
}
return(collisions);
}
private static AliensState CreateNewAliensState(int width, int height, int aliensWidth, int aliensHeight)
{
Vector2i topLeft = new Vector2i((width - aliensWidth) / 2, 0);
List <Vector2i> positions = new List <Vector2i>();
for (int y = 0; y < aliensHeight; y++)
{
for (int x = 0; x < aliensWidth; x++)
{
positions.Add(new Vector2i(x, y));
}
}
AliensState aliensState = new AliensState(topLeft, positions);
return(aliensState);
}
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);
}
public static WorldState Tick(WorldState worldState, PlayerInput playerInput)
{
PlayerState newPlayerState = TickPlayer(worldState.GameConfigState, worldState.PlayerState, playerInput);
AliensState newAliensState;
AliensMovementState newAliensMovementState;
AliensFiringInput newAliensFiringInput;
bool createNewAliens = (worldState.AliensState.RelativePositions.Count == 0);
if (createNewAliens)
{
newAliensState = CreateNewAliensState(worldState.GameConfigState.Width, worldState.GameConfigState.Height,
worldState.GameConfigState.AliensWidth, worldState.GameConfigState.AliensHeight);
newAliensMovementState = new AliensMovementState(AliensMovementState.MovementDirection.Right);
newAliensFiringInput = new AliensFiringInput(false, 0);
}
else
{
TickAliens(worldState.GameConfigState, worldState.AliensState, worldState.AliensMovementState, out newAliensState, out newAliensMovementState, out newAliensFiringInput);
}
RocketsState newRocketsState = TickRockets(worldState.GameConfigState, worldState.RocketsState, worldState.PlayerState, playerInput);
BombsState newBombsState = TickBombs(worldState.GameConfigState, worldState.BombsState, worldState.PlayerState, worldState.AliensState, newAliensFiringInput);
List <Tuple <int, int> > alienRocketCollisions = FindAlienRocketCollisions(newAliensState, newRocketsState);
List <int> playerBombCollisions = FindPlayerBombCollisions(worldState.GameConfigState, newBombsState, newPlayerState);
AliensState newAliensState2 = ResolveAlienCollisions(newAliensState, alienRocketCollisions);
RocketsState newRocketsState2 = ResolveRocketCollisions(newRocketsState, alienRocketCollisions);
GameProgressState newGameProgressState = TickGameProgress(worldState.GameConfigState, worldState.GameProgressState, newAliensState2, alienRocketCollisions.Count, playerBombCollisions.Count != 0);
return(new WorldState(worldState.GameConfigState, newPlayerState, newAliensState2, newAliensMovementState, newRocketsState2, newBombsState, newGameProgressState));
}
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 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));
}