// Adds a series of enemies to the level randomly.
public async Task SpawnEnemies()
{
// spawn snails in the level
for (var x = 0; x < TileMap.Width; x++)
{
// flag for whether there's ground on this column of the level
var groundFound = false;
for (var y = 0; y < TileMap.Height; y++)
{
if (!groundFound)
{
if (TileMap.Tiles[y, x].Id == Super50Bros.Instance.TileIdGround)
{
groundFound = true;
// random chance, 1, in 20
if (Super50Bros.Instance.Random.Next(20) == 0)
{
// instantiate snail, ceclaring in advane so we can pass it into state machine
var snail = new Snail(
"creatures",
x * Super50Bros.Instance.TileSize,
(y - 1) * Super50Bros.Instance.TileSize + 2,
16,
16,
null,
TileMap,
Level);
snail.StateMachine = new StateMachine(new Dictionary <string, State>
{
["idle"] = new SnailIdleState(TileMap, Player, snail),
["moving"] = new SnailMovingState(TileMap, Player, snail),
["chasing"] = new SnailChasingState(TileMap, Player, snail)
});
await snail.ChangeState("idle", new Dictionary <string, object>
{
["wait"] = TimeSpan.FromSeconds(Super50Bros.Instance.Random.Next(5) + 1)
});
Level.Entities.Add(snail);
}
}
}
}
}
}
public override async Task Update(TimeSpan dt)
{
if (WaitTimer < WaitPeriod)
{
WaitTimer += dt;
}
else
{
await Snail.ChangeState("moving");
}
// calculate difference between snail and player on X axis
// and only chase if <= 5 tiles
var diffX = Math.Abs(Player.X - Snail.X);
if (diffX < 5 * Super50Bros.Instance.TileSize)
{
await Snail.ChangeState("chasing");
}
}
public override async Task Update(TimeSpan dt)
{
Snail.CurrentAnimation.Update(dt);
// calculate difference between snail and player on X axis
// and only chase if <= 5 tiles
var diffX = Math.Abs(Player.X - Snail.X);
if (diffX > 5 * Super50Bros.Instance.TileSize)
{
await Snail.ChangeState("moving");
}
else if (Player.X < Snail.X)
{
Snail.Direction = Direction.Left;
Snail.X -= Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
// stop the snail if there's a missing tile on the floor to the left or a solid tile directly left
var tileLeft = TileMap.PointToTile(Snail.X, Snail.Y);
var tileBottomLeft = TileMap.PointToTile(Snail.X, Snail.Y + Snail.Height);
if ((tileLeft != null & tileBottomLeft != null) && (tileLeft.Collidable() || !tileBottomLeft.Collidable()))
{
Snail.X += Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
}
}
else
{
Snail.Direction = Direction.Right;
Snail.X += Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
// stop the snail if there's a missing tile on the floor to the right or a solid tile directly right
var tileRight = TileMap.PointToTile(Snail.X + Snail.Width, Snail.Y);
var tileBottomRight = TileMap.PointToTile(Snail.X + Snail.Width, Snail.Y + Snail.Height);
if ((tileRight != null & tileBottomRight != null) && (tileRight.Collidable() || !tileBottomRight.Collidable()))
{
Snail.X -= Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
}
}
}
public override async Task Update(TimeSpan dt)
{
MovingTimer += dt;
Snail.CurrentAnimation.Update(dt);
// reset movement direction and timer if timer is above duration
if (MovingTimer > MovingDuration)
{
// chance to go into idle state randomly
if (Super50Bros.Instance.Random.Next(4) == 0)
{
await Snail.ChangeState("idle", new System.Collections.Generic.Dictionary <string, object>
{
// random ammount of time for snail to be idle
["wait"] = TimeSpan.FromSeconds(Super50Bros.Instance.Random.Next(5) + 1)
});
}
else
{
MovingDirection = Super50Bros.Instance.Random.Next(2) == 0 ? Direction.Left : Direction.Right;
Snail.Direction = MovingDirection;
MovingDuration = TimeSpan.FromSeconds(Super50Bros.Instance.Random.Next(5));
MovingTimer = TimeSpan.Zero;
}
}
else if (Snail.Direction == Direction.Left)
{
Snail.X -= Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
// stop the snail if there's a missing tile on the floor to the left or a solid tile directly left
var tileLeft = Tilemap.PointToTile(Snail.X, Snail.Y);
var tileBottomLeft = Tilemap.PointToTile(Snail.X, Snail.Y + Snail.Height);
if ((tileLeft != null && tileBottomLeft != null) && (tileLeft.Collidable() || !tileBottomLeft.Collidable()))
{
Snail.X += Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
// reset direction if we hit a wall
MovingDirection = Direction.Right;
Snail.Direction = MovingDirection;
MovingDuration = TimeSpan.FromSeconds(Super50Bros.Instance.Random.Next(5));
MovingTimer = TimeSpan.Zero;
}
}
else
{
Snail.Direction = Direction.Right;
Snail.X += Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
// stop the snail if there's a missing tile on the floor to the left or a solid tile directly left
var tileRight = Tilemap.PointToTile(Snail.X + Snail.Width, Snail.Y);
var tileBottomRight = Tilemap.PointToTile(Snail.X + Snail.Width, Snail.Y + Snail.Height);
if ((tileRight != null && tileBottomRight != null) && (tileRight.Collidable() || !tileBottomRight.Collidable()))
{
Snail.X -= Super50Bros.Instance.SnailMoveSpeed * dt.TotalSeconds;
// reset direction if we hit a wall
MovingDirection = Direction.Left;
Snail.Direction = MovingDirection;
MovingDuration = TimeSpan.FromSeconds(Super50Bros.Instance.Random.Next(5));
MovingTimer = TimeSpan.Zero;
}
}
// calculate difference between snail and player on X axis
// and only chase if <= 5 tiles
var diffX = Math.Abs(Player.X - Snail.X);
if (diffX < 5 * Super50Bros.Instance.TileSize)
{
await Snail.ChangeState("chasing");
}
}