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Diffstat (limited to 'V3/AI/Internal/AiPlayer.cs')
| -rw-r--r-- | V3/AI/Internal/AiPlayer.cs | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/V3/AI/Internal/AiPlayer.cs b/V3/AI/Internal/AiPlayer.cs new file mode 100644 index 0000000..6040348 --- /dev/null +++ b/V3/AI/Internal/AiPlayer.cs @@ -0,0 +1,244 @@ +using System; +using System.Collections.Generic; +using System.Linq; +using Microsoft.Xna.Framework; +using V3.Objects; + +namespace V3.AI.Internal +{ + /// <summary> + /// Default implementation of IAiPlayer. + /// </summary> + // ReSharper disable once ClassNeverInstantiated.Global + public class AiPlayer : IAiPlayer + { + /// <summary> + /// The current world view of the player. It stores the knowledge of + /// the computer player based on the previous percepts. + /// </summary> + public IWorldView WorldView { get; } = new WorldView(); + /// <summary> + /// The strategy of the player. The strategy is a state machine that + /// defines the current state. + /// </summary> + public IStrategy Strategy { get; } = new AttackStrategy(); + /// <summary> + /// The current state of the player. The state is one step of the + /// strategy, and defines the specific actions to take. + /// </summary> + public AiState State { get; set; } = AiState.Idle; + /// <summary> + /// The actions that the player wants to be executed. Updated by + /// Act. + /// </summary> + public IList<IAction> Actions { get; } = new List<IAction>(); + + private readonly IActionFactory mActionFactory; + private readonly IBasicCreatureFactory mCreatureFactory; + private readonly IObjectsManager mObjectsManager; + private readonly UpdatesPerSecond mUpS = new UpdatesPerSecond(1); + private readonly Random mRandom = new Random(); + private TimeSpan mTimeSpan = TimeSpan.Zero; + private TimeSpan mTimeSpanSpawn = TimeSpan.Zero; + private int mMaxWaitBaseMs = (int) TimeSpan.FromSeconds(20).TotalMilliseconds; + private int mMaxWaitAddMs = (int) TimeSpan.FromSeconds(60).TotalMilliseconds; + + /// <summary> + /// Creates a new AI player. + /// </summary> + public AiPlayer(IActionFactory actionFactory, IBasicCreatureFactory creatureFactory, + IObjectsManager objectsManager) + { + mActionFactory = actionFactory; + mCreatureFactory = creatureFactory; + mObjectsManager = objectsManager; + } + + /// <summary> + /// Executes one update cycle -- perception, acting and the execution + /// of actions. + /// </summary> + /// <param name="gameTime">the time since the last update</param> + public void Update(GameTime gameTime) + { + mTimeSpan += gameTime.ElapsedGameTime; + if (!mUpS.IsItTime(gameTime)) + return; + Percept(); + Act(); + foreach (var action in Actions) + { + if (action.State == ActionState.Waiting) + action.Start(); + action.Update(); + } + } + + /// <summary> + /// Update the AI's view of the game world. + /// </summary> + public void Percept() + { + WorldView.EnemyCount = 0; + WorldView.PlebsCount = 0; + WorldView.NecromancerHealth = 0; + WorldView.IdlingKnights.Clear(); + WorldView.Targets.Clear(); + WorldView.Plebs.Clear(); + + foreach (var creature in mObjectsManager.CreatureList) + { + if (creature.Faction == Faction.Kingdom) + { + if (!creature.IsDead) + { + if (creature is Knight) + { + if (creature.MovementState == MovementState.Idle && creature.IsAttacking == null) + WorldView.IdlingKnights.Add(creature); + } + } + } + else if (creature.Faction == Faction.Undead) + { + if (!creature.IsDead) + { + if (!(creature is Necromancer)) + WorldView.EnemyCount++; + else + WorldView.NecromancerHealth = (float) creature.Life / creature.MaxLife; + WorldView.Targets.Add(creature); + } + } + else if (creature.Faction == Faction.Plebs) + { + if (!creature.IsDead) + { + WorldView.Plebs.Add(creature); + } + } + + WorldView.PlebsCount = WorldView.Plebs.Count; + if (WorldView.InitialPlebsCount < WorldView.PlebsCount) + WorldView.InitialPlebsCount = WorldView.PlebsCount; + } + } + + private TimeSpan GetRandomTimeSpanSpawn() + { + var factor = Math.Max(0, 500 - WorldView.EnemyCount) / 500; + return TimeSpan.FromMilliseconds(mRandom.Next(mMaxWaitBaseMs)) + + TimeSpan.FromSeconds(mRandom.Next(factor * mMaxWaitAddMs)); + } + + /// <summary> + /// Take actions based on the previous percepts, the current strategy + /// and state. + /// </summary> + public void Act() + { + State = Strategy.Update(State, WorldView); + + var completedActions = Actions.Where( + a => a.State == ActionState.Done || a.State == ActionState.Failed).ToList(); + completedActions.ForEach(a => Actions.Remove(a)); + + if (State != AiState.Idle) + { + if (mTimeSpan >= mTimeSpanSpawn) + { + mTimeSpan -= mTimeSpanSpawn; + mTimeSpanSpawn = GetRandomTimeSpanSpawn(); + SpawnKnight(); + } + } + + switch (State) + { + case AiState.Idle: + // nothing do to when idling + return; + case AiState.AttackCreatures: + // let all idling soldiers attack some creatures + if (WorldView.Targets.Count > 0) + { + foreach (var creature in WorldView.IdlingKnights) + { + ICreature target = null; + var distance = float.MaxValue; + foreach (var c in WorldView.Targets) + { + var d = Vector2.Distance(c.Position, creature.Position); + if (d < distance) + { + distance = d; + target = c; + } + } + creature.IsAttacking = target; + } + } + break; + case AiState.DefendPeasants: + if (WorldView.Plebs.Count > 0) + { + foreach (var creature in WorldView.IdlingKnights) + { + ICreature target = null; + var distance = float.MaxValue; + var threshold = (int) (creature.AttackRadius * 0.8); + foreach (var c in WorldView.Plebs) + { + var d = Vector2.Distance(c.Position, creature.Position); + if (d <= threshold) + { + target = null; + break; + } + // attempt to avoid clustering + /*if (mObjectsManager.GetObjectsInRectangle(c.SelectionRectangle).OfType<Knight>().Count() > 0) + { + continue; + }*/ + if (d < distance) + { + distance = d; + target = c; + } + } + if (target != null) + { + var offset = target.Position - creature.Position; + offset.Normalize(); + offset *= threshold; + Move(creature, target.Position + offset); + } + } + } + break; + case AiState.AttackNecromancer: + foreach (var c in WorldView.IdlingKnights) + { + c.IsAttacking = mObjectsManager.PlayerCharacter; + } + break; + } + } + + private void SpawnKnight() + { + var knight = mCreatureFactory.CreateKnight(); + var position = new Vector2(500, 500); + if (mObjectsManager.Castle != null) + position = mObjectsManager.Castle.Position; + var spawnAction = mActionFactory.CreateSpawnAction(knight, position); + Actions.Add(spawnAction); + } + + private void Move(ICreature creature, Vector2 destination) + { + var moveAction = mActionFactory.CreateMoveAction(creature, destination); + Actions.Add(moveAction); + } + } +} |