/// <summary>
/// Initializes a new instance of the <see cref="ShelledEnemyComponent"
/// /> sprite.
/// </summary>
/// <param name="owner">The sprite that owns this component.</param>
/// <param name="walkingVelocity">
/// The horizontal velocity at which the owner will walk.
/// </param>
/// <param name="shellSpinningVelocity">
/// The horizontal velocity at which the owner will spin.
/// </param>
/// <param name="framesFromShellToEmerging">
/// The number of frames between entering the Shell state and entering
/// the Emerging state.
/// </param>
/// <param name="framesFromEmergingToWalking">
/// The number of frames between entering the Emerging state and
/// entering the Walking state.
/// </param>
public ShelledEnemyComponent(Sprite owner, float walkingVelocity, float shellSpinningVelocity, int framesFromShellToEmerging, int framesFromEmergingToWalking)
{
WalkerComponent walker = owner.GetComponent<WalkerComponent>();
DamageComponent damage = owner.GetComponent<DamageComponent>();
ChasePlayerComponent chasePlayer = owner.GetComponent<ChasePlayerComponent>();
if (walker == null || damage == null || chasePlayer == null)
{
throw new ArgumentException("This component requires its owner to have WalkerComponent, DamageComponent, and ChasePlayerComponent instances before constructing this ShelledEnemyComponent.");
}
IsActive = true;
Owner = owner;
spriteWalker = walker;
spriteDamage = damage;
spriteChasePlayer = chasePlayer;
behavior = ShelledEnemyBehavior.DontTurnOnCliffs;
state = ShelledEnemyState.Walking;
this.walkingVelocity = walkingVelocity;
this.shellSpinningVelocity = shellSpinningVelocity;
this.framesFromShellToEmerging = framesFromShellToEmerging;
this.framesFromEmergingToWalking = framesFromEmergingToWalking;
spriteWalker.CurrentVelocity = walkingVelocity;
}
private void HandleSpriteCollisionWhileShell(Sprite sprite, Vector2 resolutionDistance)
{
if (sprite.IsPlayer)
{
// If the player's center is to the right (or equal to) our
// center, go left Otherwise, go right
spriteWalker.Direction = (sprite.Hitbox.Center.X >= Owner.Hitbox.X) ? Direction.Left : Direction.Right;
State = ShelledEnemyState.ShellSpinning;
ActionScheduler.Instance.CancelScheduledAction(emergeAction);
emergeAction = null;
}
}
private void GoToShell()
{
State = ShelledEnemyState.Shell;
spriteChasePlayer.IsActive = false;
emergeAction = ActionScheduler.Instance.ScheduleAction(() =>
{
State = ShelledEnemyState.Emerging;
emergeAction = ActionScheduler.Instance.ScheduleActionOnNextFrame(() =>
{
State = ShelledEnemyState.Walking;
spriteChasePlayer.IsActive = (Behavior == ShelledEnemyBehavior.ChasePlayer);
}, framesFromEmergingToWalking);
}, framesFromShellToEmerging);
}
