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feat: Add initial version of behavior_tree and flame_behavior_tree package (#3045)
First pass on adding behavior tree for flame. This PR adds 2 packages: - behavior_tree: A pure dart implementation of behavior tree. - flame_behavior_tree: A bridge package that integrates behavior_tree with flame. Demo: https://github.com/flame-engine/flame/assets/33748002/1d2b00ab-1b6e-406e-9052-a24370c8f1ab
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DevKage
323
packages/flame_behavior_tree/example/lib/main.dart
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323
packages/flame_behavior_tree/example/lib/main.dart
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import 'dart:async';
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import 'dart:math';
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import 'package:flame/components.dart';
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import 'package:flame/effects.dart';
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import 'package:flame/events.dart';
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import 'package:flame/game.dart';
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import 'package:flame/palette.dart';
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import 'package:flame_behavior_tree/flame_behavior_tree.dart';
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import 'package:flutter/material.dart';
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typedef MyGame = FlameGame<GameWorld>;
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const gameWidth = 320.0;
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const gameHeight = 180.0;
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void main() {
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runApp(const MainApp());
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}
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class MainApp extends StatelessWidget {
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const MainApp({super.key});
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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home: Scaffold(
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body: GameWidget<MyGame>.controlled(
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gameFactory: () => MyGame(
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world: GameWorld(),
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camera: CameraComponent.withFixedResolution(
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width: gameWidth,
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height: gameHeight,
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),
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),
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),
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),
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);
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}
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}
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class GameWorld extends World with HasGameReference {
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@override
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Future<void> onLoad() async {
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game.camera.moveTo(Vector2(gameWidth * 0.5, gameHeight * 0.5));
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final house = RectangleComponent(
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size: Vector2(100, 100),
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position: Vector2(gameWidth * 0.5, 10),
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paint: BasicPalette.cyan.paint()
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..strokeWidth = 5
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..style = PaintingStyle.stroke,
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anchor: Anchor.topCenter,
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);
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final door = Door(
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size: Vector2(20, 4),
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position: Vector2(40, house.size.y),
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anchor: Anchor.centerLeft,
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);
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final agent = Agent(
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door: door,
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house: house,
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position: Vector2(gameWidth * 0.76, gameHeight * 0.9),
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);
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await house.add(door);
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await addAll([house, agent]);
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}
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}
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class Door extends RectangleComponent with TapCallbacks {
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Door({super.position, super.size, super.anchor})
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: super(paint: BasicPalette.brown.paint());
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bool isOpen = false;
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bool _isInProgress = false;
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bool _isKnocking = false;
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@override
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void onTapDown(TapDownEvent event) {
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if (!_isInProgress) {
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_isInProgress = true;
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add(
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RotateEffect.to(
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isOpen ? 0 : -pi * 0.5,
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EffectController(duration: 0.5, curve: Curves.easeInOut),
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onComplete: () {
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isOpen = !isOpen;
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_isInProgress = false;
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},
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),
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);
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}
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}
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void knock() {
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if (!_isKnocking) {
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_isKnocking = true;
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add(
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MoveEffect.by(
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Vector2(0, -1),
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EffectController(
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alternate: true,
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duration: 0.1,
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repeatCount: 2,
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),
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onComplete: () {
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_isKnocking = false;
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},
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),
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);
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}
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}
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}
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class Agent extends PositionComponent with HasBehaviorTree {
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Agent({required this.door, required this.house, required Vector2 position})
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: _startPosition = position.clone(),
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super(position: position);
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final Door door;
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final PositionComponent house;
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final Vector2 _startPosition;
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@override
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Future<void> onLoad() async {
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await add(CircleComponent(radius: 3, anchor: Anchor.center));
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_setupBehaviorTree();
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super.onLoad();
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}
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void _setupBehaviorTree() {
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var isInside = false;
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var isAtTheDoor = false;
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var isAtCenterOfHouse = false;
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var isMoving = false;
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var wantsToGoOutside = false;
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final walkTowardsDoorInside = Task(() {
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if (!isAtTheDoor) {
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isMoving = true;
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add(
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MoveEffect.to(
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door.absolutePosition + Vector2(door.size.x * 0.8, -15),
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EffectController(
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duration: 3,
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curve: Curves.easeInOut,
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),
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onComplete: () {
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isMoving = false;
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isAtTheDoor = true;
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isAtCenterOfHouse = false;
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},
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),
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);
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}
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return isAtTheDoor ? NodeStatus.success : NodeStatus.running;
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});
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final stepOutTheDoor = Task(() {
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if (isInside) {
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isMoving = true;
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add(
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MoveEffect.to(
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door.absolutePosition + Vector2(door.size.x * 0.5, 10),
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EffectController(
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duration: 2,
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curve: Curves.easeInOut,
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),
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onComplete: () {
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isMoving = false;
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isInside = false;
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},
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),
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);
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}
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return !isInside ? NodeStatus.success : NodeStatus.running;
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});
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final walkTowardsInitialPosition = Task(
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() {
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if (isAtTheDoor) {
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isMoving = true;
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isAtTheDoor = false;
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add(
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MoveEffect.to(
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_startPosition,
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EffectController(
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duration: 3,
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curve: Curves.easeInOut,
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),
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onComplete: () {
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isMoving = false;
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wantsToGoOutside = false;
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},
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),
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);
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}
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return !wantsToGoOutside ? NodeStatus.success : NodeStatus.running;
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},
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);
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final walkTowardsDoorOutside = Task(() {
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if (!isAtTheDoor) {
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isMoving = true;
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add(
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MoveEffect.to(
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door.absolutePosition + Vector2(door.size.x * 0.5, 10),
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EffectController(
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duration: 3,
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curve: Curves.easeInOut,
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),
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onComplete: () {
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isMoving = false;
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isAtTheDoor = true;
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},
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),
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);
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}
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return isAtTheDoor ? NodeStatus.success : NodeStatus.running;
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});
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final walkTowardsCenterOfTheHouse = Task(() {
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if (!isAtCenterOfHouse) {
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isMoving = true;
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isInside = true;
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add(
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MoveEffect.to(
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house.absoluteCenter,
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EffectController(
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duration: 3,
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curve: Curves.easeInOut,
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),
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onComplete: () {
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isMoving = false;
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wantsToGoOutside = true;
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isAtTheDoor = false;
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isAtCenterOfHouse = true;
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},
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),
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);
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}
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return isInside ? NodeStatus.success : NodeStatus.running;
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});
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final checkIfDoorIsOpen = Condition(() => door.isOpen);
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final knockTheDoor = Task(() {
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door.knock();
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return NodeStatus.success;
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});
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final goOutsideSequence = Sequence(
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children: [
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Condition(() => wantsToGoOutside),
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Selector(
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children: [
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Sequence(
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children: [
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Condition(() => isInside),
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walkTowardsDoorInside,
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Selector(
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children: [
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Sequence(
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children: [
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checkIfDoorIsOpen,
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stepOutTheDoor,
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],
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),
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knockTheDoor,
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],
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),
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],
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),
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walkTowardsInitialPosition,
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],
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),
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],
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);
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final goInsideSequence = Sequence(
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children: [
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Condition(() => !wantsToGoOutside),
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Selector(
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children: [
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Sequence(
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children: [
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Condition(() => !isInside),
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walkTowardsDoorOutside,
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Selector(
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children: [
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Sequence(
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children: [
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checkIfDoorIsOpen,
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walkTowardsCenterOfTheHouse,
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],
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),
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knockTheDoor,
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],
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),
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],
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),
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],
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),
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],
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);
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treeRoot = Selector(
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children: [
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Condition(() => isMoving),
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goOutsideSequence,
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goInsideSequence,
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],
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);
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tickInterval = 2;
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}
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}
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