/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
base.LoadContent();
_state = new ExampleState(GameModel);
_state.LoadContent();
}
public void Start()
{
// You need to pass the "netstandard" assembly reference when in Unity.
// This is not necessary on a standalone .NET Core 2.2 console program.
// You can also pass more references and namespace usings for the C# snippets if needed.
var netstandard = AppDomain.CurrentDomain.GetAssemblies().First(n => n.GetName().Name == "netstandard").Location;
var config = new YggParserConfig();
config.ReferenceAssemblyPaths.Add(netstandard);
// You choose which currently loaded assemblies are searched for types deriving from the Node class.
config.NodeTypeAssemblies.Add(typeof(Node).Assembly.GetName().Name);
config.NodeTypeAssemblies.Add(typeof(ExampleCustomAction).Assembly.GetName().Name);
// Create the compiler and parser. They can be reused for multiple parsings.
// The only state maintained by a parser instance is the initial config passed on its constructor.
var compiler = new YggCompiler();
var parser = new YggParser(config, compiler);
// The parser gives back a behaviour tree definition, which can be used to instantiate the tree multiple times (or any node within by its GUID).
// The definition also keeps track of errors that might have happened during parsing, and other debug information.
// Node GUIDs can be assigned manually on the script files themselves. If they don't have one, the parser assigns a random one. They must be unique
// withing the context of all the files parsed. The same goes for 'TypeDefs'. You can reference TypeDefs between files.
var scriptFilePath = Path.Combine(Application.streamingAssetsPath, "exampleScript.ygg");
var definition = parser.BuildFromFiles <ExampleState>(scriptFilePath);
// The errors often have useful information to debug them. In this example there should be none.
if (definition.Errors.Count > 0)
{
throw new Exception("Errors while parsing script files.");
}
// You can instantiate any node defined on the parsed scripts by passing their GUID.
// This creates an instance of that node and all its descendants.
// This also calls Initialize() on the instantiated nodes (in a depth-first traversal, if that matters to you).
// The script files themselves have no explicit root, so you must instantiate the tree using the desired root node's GUID.
var root = definition.Instantiate("root");
// The behaviour tree object serves as a manager that handles the node's execution and async continuations.
// The behaviour tree is what keeps the "continuation state" of the tree. This means you can reuse a single "root" node instance
// on multiple behaviour trees that get updated separately without issues. This is only valid for the node types that Yggdrasil comes
// with by default. If you create new node types inheriting from the Node class, you must make sure they don't keep any state themselves.
_tree = new BehaviourTree(root);
// Some example state object passed to the tree's nodes. Kept as a field here to allocate it only once.
_state = new ExampleState();
// You can pre-pool some coroutines. Otherwise, the first run of the tree will allocate as necessary.
// They get recycled automatically. The amount of coroutines needed depends on how deep an async Coroutine method stack call can get during execution.
// Unless the nodes use multiple nested async Coroutine methods, this means only one Coroutine<Result> per node on the deepest possible branch of the tree.
// Parallel and Interrupt nodes can complicate the math, since they create multiple simultaneously active branches.
// Pre-pooling yourself like this is optional. It'll create as necessary during execution.
Yggdrasil.Coroutines.Coroutine.Pool.PrePool(20);
Yggdrasil.Coroutines.Coroutine <Result> .Pool.PrePool(20);
}
protected override void OnRecover(object message)
{
switch (message)
{
case Evt evt:
UpdateState(evt);
break;
case SnapshotOffer snapshot when snapshot.Snapshot is ExampleState:
_state = (ExampleState)snapshot.Snapshot;
break;
}
}
private void UpdateState(Evt evt)
{
_state = _state.Updated(evt);
}
//##############################################################################################
// If we ever encounter the player, shoot at them. Otherwise, patrol from A to B, wait, then
// patrol back.
//##############################################################################################
public override void EnemyUpdate()
{
base.EnemyUpdate();
float playerDistance = (transform.position - FirstPersonPlayerComponent.player.transform.position).magnitude;
// any detection of the player during the patrol stops and shoot
if (exampleState != ExampleState.Shooting && playerDistance < SHOOT_RADIUS)
{
exampleState = ExampleState.Shooting;
StopMoving();
rotation.SetAnimationIndex(SHOOT_ANIMATION_INDEX);
}
// Pretty simple finite state machine
if (exampleState == ExampleState.Idle)
{
if (patrolIdleTimer.Finished())
{
exampleState = ExampleState.Patrolling;
MoveToPosition(patrollingAToB ? patrolPointB.position : patrolPointA.position);
rotation.SetAnimationIndex(WALK_ANIMATION_INDEX);
patrollingAToB = !patrollingAToB;
}
}
else if (exampleState == ExampleState.Patrolling)
{
if (AtGoal())
{
patrolIdleTimer.Start();
exampleState = ExampleState.Idle;
rotation.SetAnimationIndex(IDLE_ANIMATION_INDEX);
}
}
else if (exampleState == ExampleState.Shooting)
{
if (playerDistance > SHOOT_RADIUS)
{
exampleState = ExampleState.Idle;
patrolIdleTimer.Start();
}
bool hasShootToken = AttackTokenComponent.RequestToken(gameObject);
if (shootTimer.Finished() && hasShootToken)
{
Vector3 toPlayer = FirstPersonPlayerComponent.player.transform.position - transform.position;
toPlayer.y = 0.0f;
transform.rotation = Quaternion.LookRotation(toPlayer);
gun.Shoot();
shootTimer.Start();
rotation.SetAnimationIndex(IDLE_ANIMATION_INDEX);
}
}
// Make sure to re-register for next frames update if we're still near enough!
if (playerDistance < UDPATE_RADIUS)
{
EnemyManagerComponent.RegisterUpdate(this);
}
}
// Start is called before the first frame update
void Start()
{
exampleState = new ExampleState(this);
exampleState2 = new ExampleState2(this);
Initialize(exampleState);
}
public void SetState(ExampleState state)
{
State = state;
}
