added states and state machines for ai behaviors

src/Behaviors/Behavior.ts

@@ -1,14 +0,0 @@
-import Emitter from "../Events/Emitter";
-import Receiver from "../Events/Receiver";
-
-export default abstract class Behavior {
-    protected receiver: Receiver;
-    protected emitter: Emitter;
-
-    constructor(){
-        this.receiver = new Receiver();
-        this.emitter = new Emitter();
-    }
-
-    abstract doBehavior(deltaT: number): void;
-}

src/BoidDemo.ts

@@ -1,12 +1,10 @@
 import Vec2 from "./DataTypes/Vec2";
-import Debug from "./Debug/Debug";
-import Point from "./Nodes/Graphics/Point";
 import Scene from "./Scene/Scene";
 import SceneGraphQuadTree from "./SceneGraph/SceneGraphQuadTree";
 import Color from "./Utils/Color";
-import Boid from "./_DemoClasses/Boid";
-import BoidBehavior from "./_DemoClasses/BoidBehavior";
-import FlockBehavior from "./_DemoClasses/FlockBehavior";
+import Boid from "./_DemoClasses/Boids/Boid";
+import FlockBehavior from "./_DemoClasses/Boids/FlockBehavior";
+import Player from "./_DemoClasses/Player/Player";
 
 /**
  * This demo emphasizes an ai system for the game engine with component architecture
@@ -24,17 +22,16 @@ export default class BoidDemo extends Scene {
         this.viewport.setBounds(0, 0, 800, 600)
         this.viewport.setCenter(400, 300);
 
-        let layer = this.addLayer()
+        let layer = this.addLayer();
         this.boids = new Array();
 
+        // Add the player
+        this.add.graphic(Player, layer, new Vec2(0, 0));
+
         // Create a bunch of boids
-        for(let i = 0; i < 200; i++){
+        for(let i = 0; i < 100; i++){
             let boid = this.add.graphic(Boid, layer, new Vec2(this.worldSize.x*Math.random(), this.worldSize.y*Math.random()));
-            let separation = 3;
-            let alignment = 1;
-            let cohesion = 3;
-            boid.addBehavior(new BoidBehavior(this, boid, separation, alignment, cohesion));
-            boid.addBehavior(new FlockBehavior(this, boid, this.boids, 75, 50));
+            boid.fb = new FlockBehavior(this, boid, this.boids, 75, 50);
             boid.setSize(5, 5);
             this.boids.push(boid);
         }
@@ -44,14 +41,14 @@ export default class BoidDemo extends Scene {
         for(let boid of this.boids){
             boid.setColor(Color.RED);
         }
-        
-        for(let boid of this.boids){
-            boid.getBehavior(FlockBehavior).doBehavior(deltaT);
-        }
 
-        
+        this.updateFlock();
+    }
+
+    updateFlock(): void {
         for(let boid of this.boids){
-            boid.getBehavior(BoidBehavior).doBehavior(deltaT);
+            boid.fb.update();
         }
     }
+
 }

src/DataTypes/State/State.ts

@@ -0,0 +1,40 @@
+import Emitter from "../../Events/Emitter";
+import GameEvent from "../../Events/GameEvent";
+import { Updateable } from "../Interfaces/Descriptors";
+import StateMachine from "./StateMachine";
+
+export default abstract class State implements Updateable {
+    protected parentStateMachine: StateMachine;
+    protected emitter: Emitter;
+
+    constructor(parent: StateMachine) {
+        this.parentStateMachine = parent;
+        this.emitter = new Emitter();
+    }
+
+    /**
+     * A method that is called when this state is entered. Use this to initialize any variables before updates occur.
+     */
+    abstract onEnter(): void;
+
+    /**
+     * Handles an input event, such as taking damage.
+     * @param event 
+     */
+    abstract handleInput(event: GameEvent): void;
+
+    abstract update(deltaT: number): void;
+
+    /**
+     * Tells the state machine that this state has ended, and makes it transition to the new state specified
+     * @param stateName The name of the state to transition to
+     */
+    protected finished(stateName: string): void {
+        this.parentStateMachine.changeState(stateName);
+    }
+
+    /**
+     * This is called when the state is ending.
+     */
+    abstract onExit(): void;
+}

src/DataTypes/State/StateMachine.ts

@@ -0,0 +1,128 @@
+import Stack from "../Stack";
+import State from "./State";
+import Map from "../Map";
+import GameEvent from "../../Events/GameEvent";
+import Receiver from "../../Events/Receiver";
+import Emitter from "../../Events/Emitter";
+import { Updateable } from "../Interfaces/Descriptors";
+
+/**
+ * An implementation of a Push Down Automata State machine. States can also be hierarchical
+ * for more flexibility, as described in Game Programming Principles.
+ */
+export default class StateMachine implements Updateable {
+    protected stack: Stack<State>;
+    protected stateMap: Map<State>;
+    protected currentState: State;
+    protected receiver: Receiver;
+    protected emitter: Emitter;
+    protected active: boolean;
+    protected emitEventOnStateChange: boolean;
+    protected stateChangeEventName: string;
+
+    constructor(){
+        this.stack = new Stack();
+        this.stateMap = new Map();
+        this.receiver = new Receiver();
+        this.emitter = new Emitter();
+        this.emitEventOnStateChange = false;
+    }
+
+    /**
+     * Sets the activity state of this state machine
+     * @param flag True if you want to set this machine running, false otherwise
+     */
+    setActive(flag: boolean): void {
+        this.active = flag;
+    }
+
+    /**
+     * Makes this state machine emit an event any time its state changes
+     * @param stateChangeEventName The name of the event to emit
+     */
+    setEmitEventOnStateChange(stateChangeEventName: string): void {
+        this.emitEventOnStateChange = true;
+        this.stateChangeEventName = stateChangeEventName;
+    }
+
+    /**
+     * Stops this state machine from emitting events on state change.
+     */
+    cancelEmitEventOnStateChange(): void {
+        this.emitEventOnStateChange = false;
+    }
+    
+    /**
+     * Initializes this state machine with an initial state and sets it running
+     * @param initialState The name of initial state of the state machine
+     */
+    initialize(initialState: string){
+        this.stack.push(this.stateMap.get(initialState));
+        this.currentState = this.stack.peek();
+        this.setActive(true);
+    }
+
+    /**
+     * Adds a state to this state machine
+     * @param stateName The name of the state to add
+     * @param state The state to add
+     */
+    addState(stateName: string, state: State): void {
+        this.stateMap.add(stateName, state);
+    }
+
+    /**
+     * Changes the state of this state machine to the provided string
+     * @param state The string name of the state to change to
+     */
+    changeState(state: string): void {
+        // Exit the current state
+        this.currentState.onExit();
+
+        // Make sure the correct state is at the top of the stack
+        if(state === "previous"){
+            // Pop the current state off the stack
+            this.stack.pop();
+        } else {
+            // Retrieve the new state from the statemap and put it at the top of the stack
+            this.stack.pop();
+            this.stack.push(this.stateMap.get(state));
+        }
+
+        // Retreive the new state from the stack
+        this.currentState = this.stack.peek();
+
+        // Emit an event if turned on
+        if(this.emitEventOnStateChange){
+            this.emitter.fireEvent(this.stateChangeEventName, {state: this.currentState});
+        }
+
+        // Enter the new state
+        this.currentState.onEnter();
+    }
+
+    /**
+     * Handles input. This happens at the very beginning of this state machine's update cycle.
+     * @param event The game event to process
+     */
+    handleInput(event: GameEvent): void {
+        this.currentState.handleInput(event);
+    }
+
+    update(deltaT: number): void {
+        // If the state machine isn't currently active, ignore all events and don't update
+        if(!this.active){
+            this.receiver.ignoreEvents();
+            return;
+        }
+
+        // Handle input from all events
+        while(this.receiver.hasNextEvent()){
+            let event = this.receiver.getNextEvent();
+            this.handleInput(event);
+        }
+
+        // Delegate the update to the current state
+        this.currentState.update(deltaT);
+    }
+}

src/DataTypes/Vec2.ts

@@ -4,10 +4,7 @@
 export default class Vec2 {
 
 	// Store x and y in an array
-	//private vec: Float32Array;
-
-	protected _x: number;
-	protected _y: number;
+	private vec: Float32Array;
 
 	/**	
 	 * When this vector changes its value, do something
@@ -15,20 +12,18 @@ export default class Vec2 {
 	private onChange: Function = () => {};
 
 	constructor(x: number = 0, y: number = 0) {
-		// this.vec = new Float32Array(2);
-		// this.vec[0] = x;
-		// this.vec[1] = y;
-		this._x = x;
-		this._y = y;
+		this.vec = new Float32Array(2);
+		this.vec[0] = x;
+		this.vec[1] = y;
 	}
 
 	// Expose x and y with getters and setters
 	get x() {
-		return this._x; //this.vec[0];
+		return this.vec[0];
 	}
 
 	set x(x: number) {
-		this._x = x;//this.vec[0] = x;
+		this.vec[0] = x;
 
 		if(this.onChange){
 			this.onChange();
@@ -36,11 +31,11 @@ export default class Vec2 {
 	}
 
 	get y() {
-		return this._y;//this.vec[1];
+		return this.vec[1];
 	}
 
 	set y(y: number) {
-		this._y = y;//this.vec[1] = y;
+		this.vec[1] = y;
 
 		if(this.onChange){
 			this.onChange();
@@ -51,6 +46,10 @@ export default class Vec2 {
 		return new Vec2(0, 0);
 	}
 
+	static get INF() {
+		return new Vec2(Infinity, Infinity);
+	}
+
 	static get UP() {
 		return new Vec2(0, -1);
 	}
@@ -88,6 +87,13 @@ export default class Vec2 {
 		return new Vec2(this.x/mag, this.y/mag);
 	}
 
+	/**
+	 * Sets the x and y elements of this vector to zero
+	 */
+	zero(){
+		return this.set(0, 0);
+	}
+
 	/**
 	 * Sets the vector's x and y based on the angle provided. Goes counter clockwise.
 	 * @param angle The angle in radians
@@ -164,6 +170,14 @@ export default class Vec2 {
 		return this;
 	}
 
+	/**
+	 * Copies the values of the other Vec2 into this one.
+	 * @param other The Vec2 to copy
+	 */
+	copy(other: Vec2): Vec2 {
+		return this.set(other.x, other.y);
+	}
+
 	/**
 	 * Adds this vector the another vector
 	 * @param other 
@@ -250,6 +264,21 @@ export default class Vec2 {
 	clone(): Vec2 {
 		return new Vec2(this.x, this.y);
 	}
+
+	/**
+	 * Returns true if this vector and other have the same x and y
+	 * @param other The vector to check against
+	 */
+	equals(other: Vec2): boolean {
+		return this.x === other.x && this.y === other.y;
+	}
+
+	/**
+	 * Returns true if this vector is the zero vector
+	 */
+	isZero(): boolean {
+		return this.x === 0 && this.y === 0;
+	}
 	
 	/**
 	 * Sets the function that is called whenever this vector is changed.

src/Nodes/GameNode.ts

@@ -1,18 +1,15 @@
-import EventQueue from "../Events/EventQueue";
 import InputReceiver from "../Input/InputReceiver";
 import Vec2 from "../DataTypes/Vec2";
 import Receiver from "../Events/Receiver";
 import Emitter from "../Events/Emitter";
 import Scene from "../Scene/Scene";
 import Layer from "../Scene/Layer";
-import { Positioned, Unique } from "../DataTypes/Interfaces/Descriptors"
-import UIElement from "./UIElement";
-import Behavior from "../Behaviors/Behavior";
+import { Positioned, Unique, Updateable } from "../DataTypes/Interfaces/Descriptors"
 
 /**
  * The representation of an object in the game world
  */
-export default abstract class GameNode implements Positioned, Unique {
+export default abstract class GameNode implements Positioned, Unique, Updateable {
 	protected input: InputReceiver;
 	private _position: Vec2;
 	protected receiver: Receiver;
@@ -20,7 +17,6 @@ export default abstract class GameNode implements Positioned, Unique {
 	protected scene: Scene;
 	protected layer: Layer;
 	private id: number;
-	protected behaviors: Array<Behavior>;
 
 	constructor(){
 		this.input = InputReceiver.getInstance();
@@ -28,7 +24,6 @@ export default abstract class GameNode implements Positioned, Unique {
 		this._position.setOnChange(this.positionChanged);
 		this.receiver = new Receiver();
 		this.emitter = new Emitter();
-		this.behaviors = new Array();
 	}
 
 	setScene(scene: Scene): void {
@@ -77,33 +72,6 @@ export default abstract class GameNode implements Positioned, Unique {
 		return this.id;
 	}
 
-	/**
-	 * Adds a behavior to the list of behaviors in this GameNode
-	 * @param behavior The behavior to add to this GameNode
-	 */
-	addBehavior(behavior: Behavior): void {
-		this.behaviors.push(behavior);
-	}
-
-	/**
-	 * Does all of the behaviors of this GameNode
-	 */
-	doBehaviors(deltaT: number): void {
-		this.behaviors.forEach(behavior => behavior.doBehavior(deltaT));
-	}
-
-	getBehavior<T extends Behavior>(constr: new (...args: any) => T): T {
-		let query = null;
-
-		for(let behavior of this.behaviors){
-			if(behavior instanceof constr){
-				query = <T>behavior;
-			}
-		}
-
-		return query;
-	}
-
 	/**
 	 * Called if the position vector is modified or replaced
 	 */

src/Nodes/Graphics/Rect.ts

@@ -15,10 +15,18 @@ export default class Rect extends Graphic {
         this.borderWidth = 0;
     }
 
+    /**
+     * Sets the border color of this rectangle
+     * @param color The border color
+     */
     setBorderColor(color: Color){
         this.borderColor = color;
     }
 
+    /**Sets the border width of this rectangle
+     * 
+     * @param width The width of the rectangle in pixels
+     */
     setBorderWidth(width: number){
         this.borderWidth = width;
     }

src/_DemoClasses/Boid.ts

@@ -1,43 +0,0 @@
-import Vec2 from "../DataTypes/Vec2";
-import Graphic from "../Nodes/Graphic";
-import BoidBehavior from "./BoidBehavior";
-
-export default class Boid extends Graphic {
-    direction: Vec2 = Vec2.UP.rotateCCW(Math.random()*2*Math.PI);
-    acceleration: Vec2 = Vec2.ZERO;
-    velocity: Vec2 = Vec2.ZERO;
-
-    constructor(position: Vec2){
-        super();
-        this.position = position;
-    }
-
-    update(deltaT: number){
-        this.position.add(this.velocity.scaled(deltaT));
-
-        this.position.x = (this.position.x + this.scene.getWorldSize().x)%this.scene.getWorldSize().x;
-        this.position.y = (this.position.y + this.scene.getWorldSize().y)%this.scene.getWorldSize().y;
-    }
-
-    render(ctx: CanvasRenderingContext2D): void {
-        let origin = this.getViewportOriginWithParallax();
-
-        let dirVec = this.direction.scaled(this.size.x, this.size.y);
-        let finVec1 = this.direction.clone().rotateCCW(Math.PI/2).scale(this.size.x/2, this.size.y/2).sub(this.direction.scaled(this.size.x/1.5, this.size.y/1.5));
-        let finVec2 = this.direction.clone().rotateCCW(-Math.PI/2).scale(this.size.x/2, this.size.y/2).sub(this.direction.scaled(this.size.x/1.5, this.size.y/1.5));
-
-        ctx.lineWidth = 1;
-        ctx.fillStyle = this.color.toString();
-        ctx.beginPath();
-        ctx.moveTo(this.position.x + dirVec.x, this.position.y + dirVec.y);
-        ctx.lineTo(this.position.x + finVec1.x, this.position.y + finVec1.y);
-        ctx.lineTo(this.position.x - dirVec.x/3, this.position.y - dirVec.y/3);
-        ctx.lineTo(this.position.x + finVec2.x,this.position.y + finVec2.y);
-        ctx.lineTo(this.position.x + dirVec.x, this.position.y + dirVec.y);
-        ctx.fill();
-
-        // ctx.fillStyle = this.color.toStringRGBA();
-        // ctx.fillRect(this.position.x - origin.x - this.size.x/2, this.position.y - origin.y - this.size.y/2,
-        //     this.size.x, this.size.y);
-    }
-}

src/_DemoClasses/BoidBehavior.ts

@@ -1,82 +0,0 @@
-import Behavior from "../Behaviors/Behavior";
-import AABB from "../DataTypes/AABB";
-import Vec2 from "../DataTypes/Vec2";
-import Debug from "../Debug/Debug";
-import Point from "../Nodes/Graphics/Point";
-import Scene from "../Scene/Scene";
-import Color from "../Utils/Color";
-import MathUtils from "../Utils/MathUtils";
-import Boid from "./Boid";
-import FlockBehavior from "./FlockBehavior";
-
-export default class BoidBehavior extends Behavior {
-    scene: Scene;
-    actor: Boid;
-    separationFactor: number;
-    alignmentFactor: number;
-    cohesionFactor: number;
-
-    static MIN_SPEED: number = 80;
-    static START_SPEED: number = 90;
-    static MAX_SPEED: number = 100;
-    static MAX_STEER_FORCE: number = 300;
-
-    constructor(scene: Scene, actor: Boid, separationFactor: number, alignmentFactor: number, cohesionFactor: number){
-        super();
-        this.scene = scene;
-        this.actor = actor;
-        this.separationFactor = separationFactor;
-        this.alignmentFactor = alignmentFactor;
-        this.cohesionFactor = cohesionFactor;        
-    }
-
-    doBehavior(deltaT: number): void {
-        if(this.actor.getId() < 1){
-            this.actor.setColor(Color.GREEN);
-        }
-
-        if(this.actor.velocity.x === 0 && this.actor.velocity.y === 0){
-            this.actor.velocity = this.actor.direction.scaled(BoidBehavior.START_SPEED * deltaT);
-        }
-
-        let flock = this.actor.getBehavior(FlockBehavior);
-
-        if(!flock.hasNeighbors){
-            // No neighbors, don't change velocity;
-            return;
-        }
-
-        let flockCenter = flock.flockCenter;
-        let flockHeading = flock.flockHeading;
-        let separationHeading = flock.separationHeading;
-
-        let offsetToFlockmateCenter = flockCenter.sub(this.actor.position);
-
-        let separationForce = this.steerTowards(separationHeading).scale(this.separationFactor);
-        let alignmentForce = this.steerTowards(flockHeading).scale(this.alignmentFactor);
-        let cohesionForce = this.steerTowards(offsetToFlockmateCenter).scale(this.cohesionFactor);
-
-        this.actor.acceleration = Vec2.ZERO;
-        this.actor.acceleration.add(separationForce).add(alignmentForce).add(cohesionForce);
-        this.actor.velocity.add(this.actor.acceleration.scaled(deltaT));
-        let speed = this.actor.velocity.mag();
-        this.actor.velocity.normalize();
-        this.actor.direction = this.actor.velocity.clone();
-        speed = MathUtils.clamp(speed, BoidBehavior.MIN_SPEED, BoidBehavior.MAX_SPEED);
-        this.actor.velocity.scale(speed);
-
-        if(this.actor.getId() < 1){
-            Debug.log("BoidDir", "Velocity: " + this.actor.velocity.toString());
-            Debug.log("BoidSep", "Separation: " + separationForce.toString());
-            Debug.log("BoidAl", "Alignment: " + alignmentForce.toString());
-            Debug.log("BoidCo", "Cohesion: " + cohesionForce.toString());
-            Debug.log("BoidSpd", "Speed: " + speed);
-        }
-    }
-
-    steerTowards(vec: Vec2){
-        let v = vec.normalize().scale(BoidBehavior.MAX_SPEED).sub(this.actor.velocity);
-        return MathUtils.clampMagnitude(v, BoidBehavior.MAX_STEER_FORCE);
-    }
-
-}

src/_DemoClasses/Boids/Boid.ts

@@ -0,0 +1,41 @@
+import Vec2 from "../../DataTypes/Vec2";
+import Graphic from "../../Nodes/Graphic";
+import BoidController from "./BoidController";
+import FlockBehavior from "./FlockBehavior";
+
+export default class Boid extends Graphic {
+    direction: Vec2 = Vec2.UP.rotateCCW(Math.random()*2*Math.PI);
+    acceleration: Vec2 = Vec2.ZERO;
+    velocity: Vec2 = Vec2.ZERO;
+
+    ai: BoidController;
+    fb: FlockBehavior;
+
+    constructor(position: Vec2){
+        super();
+        this.position = position;
+        this.ai = new BoidController(this);
+    }
+
+    update(deltaT: number){
+        this.ai.update(deltaT);
+    }
+
+    render(ctx: CanvasRenderingContext2D): void {
+        let origin = this.getViewportOriginWithParallax();
+
+        let dirVec = this.direction.scaled(this.size.x, this.size.y);
+        let finVec1 = this.direction.clone().rotateCCW(Math.PI/2).scale(this.size.x/2, this.size.y/2).sub(this.direction.scaled(this.size.x/1.5, this.size.y/1.5));
+        let finVec2 = this.direction.clone().rotateCCW(-Math.PI/2).scale(this.size.x/2, this.size.y/2).sub(this.direction.scaled(this.size.x/1.5, this.size.y/1.5));
+
+        ctx.lineWidth = 1;
+        ctx.fillStyle = this.color.toString();
+        ctx.beginPath();
+        ctx.moveTo(this.position.x - origin.x + dirVec.x,      this.position.y - origin.y + dirVec.y);
+        ctx.lineTo(this.position.x - origin.x + finVec1.x,     this.position.y - origin.y + finVec1.y);
+        ctx.lineTo(this.position.x - origin.x - dirVec.x/3,    this.position.y - origin.y - dirVec.y/3);
+        ctx.lineTo(this.position.x - origin.x + finVec2.x,     this.position.y - origin.y + finVec2.y);
+        ctx.lineTo(this.position.x - origin.x + dirVec.x,      this.position.y - origin.y + dirVec.y);
+        ctx.fill();
+    }
+}

src/_DemoClasses/Boids/BoidController.ts

@@ -0,0 +1,32 @@
+import StateMachine from "../../DataTypes/State/StateMachine";
+import { CustomGameEventType } from "../CustomGameEventType";
+import Boid from "./Boid";
+import BoidBehavior from "./BoidStates/BoidBehavior";
+import RunAwayFromPlayer from "./BoidStates/RunAwayFromPlayer";
+
+export default class BoidController extends StateMachine {
+    constructor(boid: Boid){
+        super();
+
+        // Normal Boid Behavior
+        let normalBehavior = new BoidBehavior(this, boid, 3, 1, 3);
+        this.addState("normal", normalBehavior);
+
+        // Run away from player behavior
+        let runAway = new RunAwayFromPlayer(this, boid);
+        this.addState("runAway", runAway);
+
+        // Sign up to be warned of player movement
+        this.receiver.subscribe(CustomGameEventType.PLAYER_MOVE);
+
+        this.initialize("normal");
+    }
+
+    changeState(stateName: string): void {
+        if(stateName === "runAway"){
+            this.stack.push(this.stateMap.get(stateName));
+        }
+
+        super.changeState(stateName);
+    }
+}

src/_DemoClasses/Boids/BoidStates/BoidBehavior.ts

@@ -0,0 +1,95 @@
+import State from "../../../DataTypes/State/State";
+import StateMachine from "../../../DataTypes/State/StateMachine";
+import Vec2 from "../../../DataTypes/Vec2";
+import Debug from "../../../Debug/Debug";
+import GameEvent from "../../../Events/GameEvent";
+import MathUtils from "../../../Utils/MathUtils";
+import { CustomGameEventType } from "../../CustomGameEventType";
+import Boid from "../Boid";
+
+export default class BoidBehavior extends State {
+    actor: Boid;
+    separationFactor: number;
+    alignmentFactor: number;
+    cohesionFactor: number;
+
+    static MIN_SPEED: number = 80;
+    static START_SPEED: number = 90;
+    static MAX_SPEED: number = 100;
+    static MAX_STEER_FORCE: number = 300;
+
+    constructor(parent: StateMachine, actor: Boid, separationFactor: number, alignmentFactor: number, cohesionFactor: number){
+        super(parent);
+        this.actor = actor;
+        this.separationFactor = separationFactor;
+        this.alignmentFactor = alignmentFactor;
+        this.cohesionFactor = cohesionFactor;        
+    }
+
+    onEnter(): void {
+        // Do nothing special
+    }
+
+    handleInput(event: GameEvent): void {
+        if(event.type === CustomGameEventType.PLAYER_MOVE){
+            if(this.actor.position.distanceSqTo(event.data.get("position")) < 50*50){
+                // If player moved and we're close, change state
+                this.finished("runAway");
+            }
+        }
+    }
+
+    onExit(): void {
+        // Do nothing special
+    }
+
+    update(deltaT: number): void {
+        if(this.actor.velocity.x === 0 && this.actor.velocity.y === 0){
+            this.actor.velocity = this.actor.direction.scaled(BoidBehavior.START_SPEED);
+        }
+
+        // Only update as boid if it has neighbors
+        if(this.actor.fb.hasNeighbors){
+            let flockCenter = this.actor.fb.flockCenter;
+            let flockHeading = this.actor.fb.flockHeading;
+            let separationHeading = this.actor.fb.separationHeading;
+
+            let offsetToFlockmateCenter = flockCenter.sub(this.actor.position);
+
+            let separationForce = this.steerTowards(separationHeading).scale(this.separationFactor);
+            let alignmentForce = this.steerTowards(flockHeading).scale(this.alignmentFactor);
+            let cohesionForce = this.steerTowards(offsetToFlockmateCenter).scale(this.cohesionFactor);
+
+            this.actor.acceleration = Vec2.ZERO;
+            this.actor.acceleration.add(separationForce).add(alignmentForce).add(cohesionForce);
+            this.actor.velocity.add(this.actor.acceleration.scaled(deltaT));
+            let speed = this.actor.velocity.mag();
+            this.actor.velocity.normalize();
+            this.actor.direction = this.actor.velocity.clone();
+            speed = MathUtils.clamp(speed, BoidBehavior.MIN_SPEED, BoidBehavior.MAX_SPEED);
+            this.actor.velocity.scale(speed);
+
+            if(this.actor.getId() < 1){
+                Debug.log("BoidSep", "Separation: " + separationForce.toString());
+                Debug.log("BoidAl", "Alignment: " + alignmentForce.toString());
+                Debug.log("BoidCo", "Cohesion: " + cohesionForce.toString());
+                Debug.log("BoidSpd", "Speed: " + speed);
+            }
+        }
+
+        if(this.actor.getId() < 1){
+            Debug.log("BoidDir", "Velocity: " + this.actor.velocity.toString());
+        }
+
+        // Update the position
+        this.actor.position.add(this.actor.velocity.scaled(deltaT));
+        this.actor.position.x = (this.actor.position.x + this.actor.getScene().getWorldSize().x)%this.actor.getScene().getWorldSize().x;
+        this.actor.position.y = (this.actor.position.y + this.actor.getScene().getWorldSize().y)%this.actor.getScene().getWorldSize().y;
+    }
+
+    steerTowards(vec: Vec2){
+        let v = vec.normalize().scale(BoidBehavior.MAX_SPEED).sub(this.actor.velocity);
+        return MathUtils.clampMagnitude(v, BoidBehavior.MAX_STEER_FORCE);
+    }
+
+}

src/_DemoClasses/Boids/BoidStates/RunAwayFromPlayer.ts

@@ -0,0 +1,82 @@
+import State from "../../../DataTypes/State/State";
+import StateMachine from "../../../DataTypes/State/StateMachine";
+import Vec2 from "../../../DataTypes/Vec2";
+import GameEvent from "../../../Events/GameEvent";
+import MathUtils from "../../../Utils/MathUtils";
+import { CustomGameEventType } from "../../CustomGameEventType";
+import Boid from "../Boid";
+
+export default class RunAwayFromPlayer extends State {
+    actor: Boid;
+    runAwayDirection: Vec2;
+    lastPlayerPosition: Vec2;
+
+    timeElapsed: number;
+
+    static RUN_AWAY_SPEED: number = 120;
+    static MAX_STEER_FORCE: number = 300;
+    static FEAR_RADIUS: number = 75;
+
+    constructor(parent: StateMachine, actor: Boid){
+        super(parent);
+        this.actor = actor;
+    }
+
+    onEnter(): void {
+        console.log("Entered Running away")
+        this.runAwayDirection = Vec2.ZERO;
+        this.lastPlayerPosition = Vec2.INF;
+        this.timeElapsed = 0;
+    }
+
+    handleInput(event: GameEvent): void {
+        if(event.type === CustomGameEventType.PLAYER_MOVE){
+            this.lastPlayerPosition.copy(event.data.get("position"));
+
+            if(this.actor.position.distanceSqTo(this.lastPlayerPosition)
+                < RunAwayFromPlayer.FEAR_RADIUS*RunAwayFromPlayer.FEAR_RADIUS){
+                // Reset our run away timer
+                this.timeElapsed = 0;
+
+                // Update the run away direction
+                this.runAwayDirection.copy(this.actor.position).sub(event.data.get("position")).normalize();                
+            }
+        }
+    }
+
+    update(deltaT: number): void {
+        this.timeElapsed += deltaT;
+
+        // Run away for at least 500 ms
+        if(this.timeElapsed > 0.5){
+            // If it's been long enough, go back to what we were doing before
+            this.finished("previous");
+        }
+
+        // Move away from the player
+        let force = this.steerTowards(this.runAwayDirection.clone()).scaled(10);
+
+        this.actor.acceleration = force;
+        this.actor.velocity.add(this.actor.acceleration.scaled(deltaT));
+        let speed = this.actor.velocity.mag();
+        this.actor.velocity.normalize();
+        this.actor.direction = this.actor.velocity.clone();
+        speed = MathUtils.clamp(speed, RunAwayFromPlayer.RUN_AWAY_SPEED, RunAwayFromPlayer.RUN_AWAY_SPEED);
+        this.actor.velocity.scale(speed);
+
+        // Update the position
+        this.actor.position.add(this.actor.velocity.scaled(deltaT));
+        this.actor.position.x = (this.actor.position.x + this.actor.getScene().getWorldSize().x)%this.actor.getScene().getWorldSize().x;
+        this.actor.position.y = (this.actor.position.y + this.actor.getScene().getWorldSize().y)%this.actor.getScene().getWorldSize().y;
+    }
+
+    onExit(): void {
+
+    }
+
+    steerTowards(vec: Vec2){
+        let v = vec.normalize().scale(RunAwayFromPlayer.RUN_AWAY_SPEED).sub(this.actor.velocity);
+        return MathUtils.clampMagnitude(v, RunAwayFromPlayer.MAX_STEER_FORCE);
+    }
+
+}

src/_DemoClasses/Boids/FlockBehavior.ts

@@ -1,13 +1,11 @@
-import Behavior from "../Behaviors/Behavior";
-import AABB from "../DataTypes/AABB";
-import Vec2 from "../DataTypes/Vec2";
-import Point from "../Nodes/Graphics/Point";
-import Scene from "../Scene/Scene";
-import Color from "../Utils/Color";
+import AABB from "../../DataTypes/AABB";
+import Vec2 from "../../DataTypes/Vec2";
+import Point from "../../Nodes/Graphics/Point";
+import Scene from "../../Scene/Scene";
+import Color from "../../Utils/Color";
 import Boid from "./Boid";
-import BoidBehavior from "./BoidBehavior";
 
-export default class FlockBehavior extends Behavior {
+export default class FlockBehavior {
     scene: Scene;
     actor: Boid;
     flock: Array<Boid>;
@@ -19,7 +17,6 @@ export default class FlockBehavior extends Behavior {
     separationHeading: Vec2;
 
     constructor(scene: Scene, actor: Boid, flock: Array<Boid>, visionRange: number, avoidRadius: number) {
-        super();
         this.scene = scene;
         this.actor = actor;
         this.flock = flock;
@@ -28,7 +25,7 @@ export default class FlockBehavior extends Behavior {
         this.avoidRadius = avoidRadius;
     }
 
-    doBehavior(deltaT: number): void {
+    update(): void {
         
         // Update the visible region
         this.visibleRegion.setCenter(this.actor.getPosition().clone());

src/_DemoClasses/CustomGameEventType.ts

@@ -0,0 +1,3 @@
+export enum CustomGameEventType {
+    PLAYER_MOVE = "player_move",
+}

src/_DemoClasses/Player/Player.ts

@@ -0,0 +1,17 @@
+import Vec2 from "../../DataTypes/Vec2";
+import Rect from "../../Nodes/Graphics/Rect";
+import PlayerController, { PlayerType } from "./PlayerController";
+
+export default class Player extends Rect {
+    controller: PlayerController;
+
+    constructor(position: Vec2){
+        super(position, new Vec2(20, 20));
+
+        this.controller = new PlayerController(this, PlayerType.TOPDOWN);
+    }
+
+    update(deltaT: number): void {
+        this.controller.update(deltaT);
+    }
+}

src/_DemoClasses/Player/PlayerController.ts

@@ -0,0 +1,50 @@
+import StateMachine from "../../DataTypes/State/StateMachine";
+import CanvasNode from "../../Nodes/CanvasNode";
+import IdleTopDown from "./PlayerStates/IdleTopDown";
+import MoveTopDown from "./PlayerStates/MoveTopDown";
+
+export enum PlayerType {
+    PLATFORMER = "platformer",
+    TOPDOWN = "topdown"
+}
+
+export enum PlayerStates {
+    MOVE = "move",
+    IDLE = "idle"
+}
+
+export default class PlayerController extends StateMachine {
+    protected owner: CanvasNode;
+
+    constructor(owner: CanvasNode, playerType: string){
+        super();
+        
+        this.owner = owner;
+
+        if(playerType === PlayerType.TOPDOWN){
+            this.initializeTopDown();
+        }
+    }
+
+    /**
+     * Initializes the player controller for a top down player
+     */
+    initializeTopDown(): void {
+        let idle = new IdleTopDown(this);
+        let move = new MoveTopDown(this, this.owner);
+
+        this.addState(PlayerStates.IDLE, idle);
+        this.addState(PlayerStates.MOVE, move);
+
+        this.initialize(PlayerStates.IDLE);
+    }
+
+    changeState(stateName: string): void {
+        if(stateName === PlayerStates.MOVE){
+            // If move, push to the stack
+            this.stack.push(this.stateMap.get(stateName));
+        }
+
+        super.changeState(stateName);
+    }
+}

src/_DemoClasses/Player/PlayerStates/IdleTopDown.ts

@@ -0,0 +1,32 @@
+import State from "../../../DataTypes/State/State";
+import Vec2 from "../../../DataTypes/Vec2";
+import GameEvent from "../../../Events/GameEvent";
+import InputReceiver from "../../../Input/InputReceiver";
+import { PlayerStates } from "../PlayerController";
+
+export default class IdleTopDown extends State {
+    direction: Vec2 = Vec2.ZERO;
+    input: InputReceiver = InputReceiver.getInstance();
+
+    onEnter(): void {
+        this.direction.zero();
+    }
+
+    handleInput(event: GameEvent): void {
+        // Ignore inputs
+    }
+
+    update(deltaT: number): void {
+        // If we're starting to move, change states
+        this.direction.x = (this.input.isPressed("a") ? -1 : 0) + (this.input.isPressed("d") ? 1 : 0);
+        this.direction.y = (this.input.isPressed("w") ? -1 : 0) + (this.input.isPressed("s") ? 1 : 0);
+
+        if(!this.direction.isZero()){
+            this.finished(PlayerStates.MOVE);
+            return;
+        }
+    }
+
+    onExit(): void {}
+    
+}

src/_DemoClasses/Player/PlayerStates/MoveTopDown.ts

@@ -0,0 +1,51 @@
+import State from "../../../DataTypes/State/State";
+import StateMachine from "../../../DataTypes/State/StateMachine";
+import Vec2 from "../../../DataTypes/Vec2";
+import GameEvent from "../../../Events/GameEvent";
+import InputReceiver from "../../../Input/InputReceiver";
+import CanvasNode from "../../../Nodes/CanvasNode";
+import { CustomGameEventType } from "../../CustomGameEventType";
+
+export default class MoveTopDown extends State {
+    direction: Vec2 = Vec2.ZERO;
+    speed: number = 0;
+    input: InputReceiver = InputReceiver.getInstance();
+    owner: CanvasNode;
+
+    constructor(parent: StateMachine, owner: CanvasNode) {
+        super(parent);
+        this.owner = owner;
+    }
+
+    onEnter(): void {
+        // Initialize or reset the direction and speed
+        this.direction.zero();
+        this.speed = 100;
+    }
+
+    handleInput(event: GameEvent): void {
+        // Ignore input for now
+    }
+
+    update(deltaT: number): void {
+        // Get direction
+        this.direction.x = (this.input.isPressed("a") ? -1 : 0) + (this.input.isPressed("d") ? 1 : 0);
+        this.direction.y = (this.input.isPressed("w") ? -1 : 0) + (this.input.isPressed("s") ? 1 : 0);
+
+        if(this.direction.isZero()){
+            this.finished("previous");
+            return;
+        }
+
+        // Otherwise, we are still moving, so update position
+        let velocity = this.direction.normalize().scale(this.speed);
+        this.owner.position.add(velocity.scale(deltaT));
+
+        // Emit an event to tell the world we are moving
+        this.emitter.fireEvent(CustomGameEventType.PLAYER_MOVE, {position: this.owner.position.clone()});
+    }
+
+    onExit(): void {
+        // Nothing special to do here
+    }
+}