ported simulation

src/app/components/game/command.ts

@@ -1,5 +0,0 @@
-export interface Command {
-	step: number;
-	type: string;
-	payload: any;
-}

src/app/components/game/data/EEnemySize.ts

@@ -0,0 +1,5 @@
+export enum EEnemySize {
+    Tiny,
+    Normal,
+    Huge
+}

src/app/components/game/data/EProjectileEffectType.ts

@@ -0,0 +1,3 @@
+export enum EProjectileEffectType {
+    Damage = 0
+}

src/app/components/game/game.component.html

@@ -3,7 +3,7 @@
 
 	<div class="main-area">
 		<div class="canvas-wrapper" #canvasWrapper>
-			<canvas #gameCanvas></canvas>
+			<canvas #gameCanvas (click)="onCanvasClick($event)"></canvas>
 		</div>
 		<div class="bottom-panel">
 			<button (click)="rewind()">⏮ Rewind</button>
@@ -11,8 +11,7 @@
 			<button (click)="stop()">⏸ Pause</button>
 			<button (click)="step()">Step</button>
 			<button (click)="fastForward()">⏭ Fast Forward</button>
-			<div>Step: {{ engine.currentStep }}</div>
-            <button (click)="issueMove()">🚶 Move Unit</button>
+			<div>Step: {{ simMain.currentStep }}</div>
 			<button (click)="openOptions()">Options</button>
 		</div>
 	</div>

src/app/components/game/game.component.ts

@@ -1,9 +1,8 @@
 import { Component, ElementRef, OnInit, ViewChild } from '@angular/core';
 import { OptionsComponent } from '../options/options.component';
-import { GameState } from './gameState';
-import { SimulationEngine } from './simulationEngine';
-import { GameRules } from './gameRules';
-import { Command } from './command';
+import { SimMain } from './sim/SimMain';
+import { GdRoot } from './data/GdRoot';
+import { SimCommand } from './sim/commands/SimCommand';
 
 @Component({
 	selector: 'app-game',
@@ -12,10 +11,11 @@ import { Command } from './command';
 	imports: [OptionsComponent],
 })
 export class GameComponent implements OnInit {
-	engine!: SimulationEngine;
+	simMain!: SimMain;
 	private optionsOpen = false;
 	private isPaused = false;
 	private lastFrameTime = 0;
+	private tileSize = 10; // Size of each tile in pixels
 
 	@ViewChild('gameCanvas') canvasRef!: ElementRef<HTMLCanvasElement>;
 	@ViewChild('canvasWrapper') wrapperRef!: ElementRef<HTMLDivElement>;
@@ -26,93 +26,78 @@ export class GameComponent implements OnInit {
 	pixelScale: number = 1;
 
 	async ngOnInit() {
-		const initialState: GameState = {
-			tick: 0,
-			units: [{ id: 'u1', x: 0, y: 0 }],
-			commandHistory: [],
-		};
-
-		const json = await fetch('/assets/gameData.json').then((r) => r.json());
-		this.engine = new SimulationEngine(initialState, GameRules, json);
+		const gdRoot = await this.loadGdRoot();
+		this.simMain = new SimMain(gdRoot);
 		requestAnimationFrame(this.gameLoop.bind(this));
 	}
 
 	start() {
-		this.engine.start();
+		this.simMain.start(performance.now());
 	}
 
 	stop() {
-		this.engine.stop();
+		this.simMain.stop();
 	}
 
 	step() {
-		this.engine.step();
+		this.simMain.step();
 	}
 
 	rewind() {
-		this.engine.rewindToZero();
+		//this.simMain.rewindToZero();
 	}
 
 	fastForward() {
-		this.engine.fastForwardToEnd();
+		this.simMain.fastForwardToEnd();
+	}
+
+	async loadGdRoot(): Promise<GdRoot> {
+		const data = await fetch('/assets/data/gdRoot.json').then((r) => r.json());
+		// if (!isGdRoot(data)) {
+		// 	throw new Error("Invalid GdRoot!");
+		// }
+		const gdRoot: GdRoot = data;
+		return gdRoot;
 	}
 
 	async reloadGameData() {
-		const json = await fetch('/assets/gameData.json').then((r) => r.json());
-		this.engine.reinitializeWithNewData(json);
-	}
-
-	issueMove() {
-		const cmd: Command = {
-			step: this.engine.currentStep + 1,
-			type: 'move',
-			payload: { id: 'u1', dx: 1, dy: 0 },
-		};
-		this.engine.issueCommand(cmd);
+		this.simMain.setGdRoot(await this.loadGdRoot());
 	}
 
 	ngAfterViewInit(): void {
 		this.resizeCanvas();
-		requestAnimationFrame(this.render);
+		requestAnimationFrame(this.update);
 		window.addEventListener('resize', this.resizeCanvas.bind(this));
 	}
 
-	render = (now: number) => {
-		if (!this.engine) return;
+	update = (now: number) => {
+		if (!this.simMain) {
+			return;
+		}
 
-		const [prevState, currState] = this.engine.getRenderStates();
+		this.simMain.update(now)
 
-		// Compute interpolation factor (0..1)
-		const lastStepTime = this.engine.isRunning ? this.engine.lastStepTime : now;
-		const t = this.engine.isRunning
-			? Math.max(Math.min((now - lastStepTime) / this.engine.interval, 1), 0)
-			: 1; // fully render the last known state
+		const lastStepTime = this.simMain.isRunning
+			? this.simMain.lastStepTime
+			: now;
+		const t = this.simMain.isRunning
+			? Math.max(
+					Math.min((now - lastStepTime) / this.simMain.interval, 1),
+					0
+			  )
+			: 1;
 
-		this.renderFrame(prevState, currState, t);
+		this.renderFrame(t);
 
-		requestAnimationFrame(this.render);
+		requestAnimationFrame(this.update);
 	};
 
-	renderFrame(prev: GameState, curr: GameState, t: number) {
+	renderFrame(t: number) {
 		const ctx = this.canvasRef.nativeElement.getContext('2d');
 		if (!ctx) return;
 
 		const canvas = this.canvasRef.nativeElement;
 		ctx.clearRect(0, 0, canvas.width, canvas.height);
-
-		for (let i = 0; i < curr.units.length; i++) {
-			const currUnit = curr.units[i];
-			const prevUnit =
-				prev.units.find((u) => u.id === currUnit.id) ?? currUnit;
-
-			const x = prevUnit.x + (currUnit.x - prevUnit.x) * t;
-			const y = prevUnit.y + (currUnit.y - prevUnit.y) * t;
-
-			ctx.fillStyle = 'cyan';
-			ctx.beginPath();
-			ctx.arc(x * 10, y * 10, 5, 0, Math.PI * 2);
-			ctx.fill();
-		}
 	}
 
 	resizeCanvas(): void {
@@ -149,6 +134,18 @@ export class GameComponent implements OnInit {
 		return [px / this.pixelScale, py / this.pixelScale];
 	}
 
+	onCanvasClick(event: MouseEvent) {
+		const canvas = this.canvasRef.nativeElement;
+		const rect = canvas.getBoundingClientRect();
+		const scaleX = canvas.width / rect.width;
+		const scaleY = canvas.height / rect.height;
+
+		const px = (event.clientX - rect.left) * scaleX;
+		const py = (event.clientY - rect.top) * scaleY;
+
+		const [gx, gy] = this.fromScreen(px, py);
+	}
+
 	private gameLoop(currentTime: number): void {
 		if (this.lastFrameTime === 0) {
 			this.lastFrameTime = currentTime;

src/app/components/game/gameData.ts

@@ -1,6 +0,0 @@
-export interface GameData {
-	unitSpeed: number;
-	maxUnits: number;
-	enemySpawnRate: number;
-	// anything else that's tunable
-}

src/app/components/game/gameRules.ts

@@ -1,37 +0,0 @@
-import { Command } from './command';
-import { GameData } from './gameData';
-import { GameState } from './gameState';
-
-export const GameRules = {
-	step(state: GameState, data: GameData): GameState {
-		const nextTick = state.tick + 1;
-
-		// Get all commands for this step
-		const commands = state.commandHistory.filter(
-			(c) => c.step === nextTick
-		);
-		// Clone and update
-		const newState: GameState = {
-			...state,
-			tick: state.tick + 1,
-			units: state.units.map((u) => ({
-				...u,
-				x: u.x + 1, // Simple movement
-			})),
-		};
-		for (const cmd of commands) {
-			this.applyCommand(newState, cmd, data);
-		}
-		return newState;
-	},
-
-	applyCommand(state: GameState, cmd: Command, data: GameData): void {
-		if (cmd.type === 'move') {
-			const unit = state.units.find((u) => u.id === cmd.payload.id);
-			if (unit) {
-                unit.x += cmd.payload.dx * data.unitSpeed;
-                unit.y += cmd.payload.dy * data.unitSpeed;
-			}
-		}
-	},
-};

src/app/components/game/gameState.ts

@@ -1,7 +0,0 @@
-import { Command } from "./command";
-
-export interface GameState {
-	tick: number;
-	units: { id: string; x: number; y: number }[];
-    commandHistory: Command[];
-}

src/app/components/game/sim/ECellType.ts

@@ -0,0 +1,6 @@
+export enum ECellType {
+    Free = 0,
+    Blocked = 1,
+    Entry = 2,
+    Reserved
+};

src/app/components/game/sim/SimCell.ts

@@ -0,0 +1,20 @@
+import { Hex } from "../util/Hex";
+import { ECellType } from "./ECellType";
+import { SimTower } from "./SimTower";
+
+export class SimCell {
+	hex: Hex;
+	distance: number;
+	type: ECellType;
+	index: number;
+	blockedType: number = -1;
+	tower: SimTower | null = null;
+	pathsToTarget: number[][] = [];
+
+	constructor(hex: Hex, distance: number, type: ECellType, cellIndex: number) {
+		this.hex = hex;
+		this.distance = distance;
+		this.type = type;
+		this.index = cellIndex;
+	}
+}

src/app/components/game/sim/SimEnemy.ts

@@ -0,0 +1,71 @@
+import { EEnemySize } from '../data/EEnemySize';
+import { EProjectileEffectType } from '../data/EProjectileEffectType';
+import { GdProjectileEffect } from '../data/GdProjectileEffect';
+import { Hex } from '../util/Hex';
+import { Vector2 } from '../util/Vector2';
+import { SimLevel } from './SimLevel';
+
+export class SimEnemy {
+	index: number = -1;
+	routeIdx: number = -1;
+	startHex: Hex = new Hex(0, 0);
+	endHex: Hex = new Hex(0, 0);
+	path: number[] = [];
+	prevPosition: Vector2 = new Vector2(0, 0);
+	position: Vector2 = new Vector2(0, 0);
+	direction: Vector2 = new Vector2(0, 0);
+	currentPathIndex: number = -1;
+	currentPathStep: number = -1;
+	currentPathPosition: Vector2 = new Vector2(0, 0);
+	dead: boolean = false;
+	hitPonts: number = 0;
+	size: EEnemySize = EEnemySize.Tiny;
+	speed: number = 0;
+	gain: number = 0;
+
+	constructor(index: number, routeIdx: number) {
+		this.index = index;
+		this.routeIdx = routeIdx;
+	}
+
+	public suffer(level: SimLevel, effect: GdProjectileEffect) {
+		switch (effect.type) {
+			case EProjectileEffectType.Damage: {
+				this.hitPonts -= effect.amount;
+				if (this.hitPonts <= 0) {
+					level.currency += this.gain;
+					this.dead = true;
+				}
+				break;
+			}
+		}
+	}
+
+	public onPathUpdated(level: SimLevel) {
+		const myPos = this.position;
+		this.currentPathPosition = myPos;
+
+		if (this.path == null) {
+			return;
+		}
+
+		const current = this.path[this.currentPathIndex];
+		const next = this.path[this.currentPathIndex + 1];
+		if (!next) {
+			return;
+		}
+
+		const cells = level.cells;
+		const pos1 = cells[current].hex.toWorld();
+		const pos2 = cells[next].hex.toWorld();
+		const myDir = pos2.subtract(myPos);
+		const myLen = myDir.magnitude();
+		const hexDir = pos2.subtract(pos1);
+		const hexLen = hexDir.magnitude();
+		if (myLen > hexLen) {
+			this.path.unshift(this.path[0]);
+		}
+
+		this.direction = myDir.multiplyScalar(1 / myLen);
+	}
+}

src/app/components/game/sim/SimLevel.ts

@@ -0,0 +1,181 @@
+import { GdRoot } from "../data/GdRoot";
+import { EDirection } from "../util/EDirection";
+import { Hex } from "../util/Hex";
+import { PathFinding } from "../util/PathFinding";
+import { ECellType } from "./ECellType";
+import { SimCell } from "./SimCell";
+import { SimEnemy } from "./SimEnemy";
+import { SimProjectile } from "./SimProjectile";
+
+export class SimLevel {
+	paused: boolean = true;
+	currentStep: number = -1;
+	highlightedIndex: number = -1;
+	currency: number = -1;
+	stride: number = -1;
+	cells: SimCell[] = [];
+	enemies: SimEnemy[] = [];
+	projectiles: SimProjectile[] = [];
+	nextWaveStep: number = -1;
+	lastEnemySpawnStep: number = 0;
+	currentWave: number = -1;
+	enemiesLeftToSpawn: number = 0;
+	index: number = 0;
+	radius: number = 0;
+
+    constructor(gdRoot: GdRoot, levelIdx: number) {
+        const gdLevel = gdRoot.levels[levelIdx];
+        this.index = levelIdx;
+        this.currency = gdLevel.currency;
+        this.enemiesLeftToSpawn = gdLevel.waves[0].amount;
+
+        this.radius = gdLevel.radius;
+        this.stride = 2 * this.radius + 1;
+        const h0 = new Hex(0, 0);
+        for (let y = -this.radius; y <= this.radius; ++y) {
+            for (let x = -this.radius; x <= this.radius; ++x) {
+                const hex = new Hex(x, y);
+                const distance = Hex.distance(hex, h0);
+                const type = distance >= this.radius ? ECellType.Blocked : ECellType.Free;
+                const cellIndex = this.getCellIndex(hex);
+                this.cells[cellIndex] = new SimCell(hex, distance, type, cellIndex);
+            }
+        }
+
+        gdLevel.walls.forEach((wall: Hex) => {
+            const cellIndex = this.getCellIndex(wall);
+            this.cells[cellIndex].type = ECellType.Blocked;
+        });
+
+        gdLevel.enemySpawns.forEach((hex: Hex) => {
+            const cellIndex = this.getCellIndex(hex);
+            this.cells[cellIndex].type = ECellType.Entry;
+        });
+
+        gdLevel.enemyTargets.forEach((hex: Hex) => {
+            const cellIndex = this.getCellIndex(hex);
+            this.cells[cellIndex].type = ECellType.Entry;
+        });
+
+        this.cells.forEach((cell: SimCell) => {
+            this.updateBlockedType(cell);
+        });
+
+        this.updatePaths(gdRoot);
+    };
+
+    public getCellIndex(hex: Hex) {
+        const x = hex.col + this.radius;
+        const y = hex.row + this.radius;
+        if (x < 0 || x >= this.stride || y < 0 || y >= this.stride) {
+            return -1;
+        }
+        return y * this.stride + x;
+    }
+
+    public getNeighbourCell(cell: SimCell, direction: EDirection) {
+        const hex = cell.hex;
+        const neighbourHex = Hex.neighbour(hex, direction);
+        const neighbourIndex = this.getCellIndex(neighbourHex);
+        return this.cells[neighbourIndex];
+    }
+
+    public updateBlockedType(cell: SimCell) {
+        if (cell.type == ECellType.Free) {
+            cell.blockedType = -1;
+            return;
+        }
+
+        if (cell.type == ECellType.Entry && cell.blockedType != -1) {
+            return;
+        }
+
+        let blockedType = 0;
+        for (let direction = 0; direction < 6; ++direction) {
+            const neighbourCell = this.getNeighbourCell(cell, direction);
+            if (!!neighbourCell && neighbourCell.type == ECellType.Free) {
+                blockedType |= 1 << direction;
+            }
+        }
+
+        cell.blockedType = blockedType;
+    }
+
+    public reservePaths(gdRoot: GdRoot, hexToBlock: Hex | null): boolean {
+        try {
+            if (!!hexToBlock) {
+                const reservedCell = this.cells[this.getCellIndex(hexToBlock)];
+                if (reservedCell.type != ECellType.Free || !!reservedCell.tower)
+                    return false;
+
+                reservedCell.type = ECellType.Reserved;
+            }
+
+            return this.updatePaths(gdRoot);
+        }
+        finally {
+            if (!!hexToBlock) {
+                const reservedCell = this.cells[this.getCellIndex(hexToBlock)];
+                if (reservedCell.type == ECellType.Reserved)
+                    reservedCell.type = ECellType.Free
+            }
+        }
+    }
+
+    public updatePaths(gdRoot: GdRoot): boolean {
+        const newRoutePaths: number[][] = [];
+        const newEnemyPaths: number[][] = [];
+        const gdLevel = gdRoot.levels[this.index];
+        let invalid = false;
+
+        for (const routeIdx in gdLevel.enemyRoutes) {
+            const route = gdLevel.enemyRoutes[routeIdx];
+            const enemySpawnHex = gdLevel.enemySpawns[route[0]];
+            const enemySpawnCell = this.cells[this.getCellIndex(enemySpawnHex)];
+            const enemyTargetHex = gdLevel.enemyTargets[route[1]];
+            const enemyTargetCell = this.cells[this.getCellIndex(enemyTargetHex)];
+            const path = PathFinding.bfs(this, enemySpawnCell.index, enemyTargetCell.index);
+            if (path == null) {
+                invalid = true;
+                break;
+            }
+            newRoutePaths[routeIdx] = path;
+        }
+
+        if (invalid) {
+            return false;
+        }
+
+        for (let idx in this.enemies) {
+            const simEnemy = this.enemies[idx];
+            const hex = Hex.fromWorld(simEnemy.position);
+            const startIndex = this.getCellIndex(hex);
+            const endIndex = this.getCellIndex(simEnemy.endHex);
+            const path = PathFinding.bfs(this, startIndex, endIndex);
+            if (path == null) {
+                invalid = true;
+                break;
+            }
+            newEnemyPaths[idx] = path;
+        }
+
+        if (invalid) {
+            return false;
+        }
+
+        for (const routeIdx in gdLevel.enemyRoutes) {
+            const route = gdLevel.enemyRoutes[routeIdx];
+            const enemySpawnHex = gdLevel.enemySpawns[route[0]];
+            const enemySpawnCell = this.cells[this.getCellIndex(enemySpawnHex)];
+            enemySpawnCell.pathsToTarget[routeIdx] = newRoutePaths[routeIdx];
+        }
+
+        this.enemies.forEach((simEnemy: SimEnemy, idx: number) => {
+            simEnemy.path = newEnemyPaths[idx];
+            simEnemy.currentPathIndex = 0;
+            simEnemy.onPathUpdated(this);
+        });
+
+        return true;
+    }
+}

src/app/components/game/sim/SimMain.ts

@@ -0,0 +1,95 @@
+import { SplashComponent } from '../../splash/splash.component';
+import { GdRoot } from '../data/GdRoot';
+import { ISimAction } from './actions/ISimAction';
+import { SimActionFireTowers } from './actions/SimActionFireTowers';
+import { SimActionMoveEnemies } from './actions/SimActionMoveEnemies';
+import { SimActionMoveProjectiles } from './actions/SimActionMoveProjectiles';
+import { SimActionSpawnEnemies } from './actions/SimActionSpawnEnemies';
+import { SimCommand } from './commands/SimCommand';
+import { SimLevel } from './SimLevel';
+
+export class SimMain {
+    executeUntilStep(targetStep: number) {
+        throw new Error("Method not implemented.");
+    }
+	lastTime = 0;
+	currentStep = -1;
+	isRunning = false;
+	lastStepTime: number = 0;
+	currentLevel: SimLevel | null = null;
+	commandHistory: SimCommand[] = [];
+	gdRoot: GdRoot = null!;
+	interval: number = 0;
+	private actions: ISimAction[] = [];
+
+	constructor(gdRoot: GdRoot) {
+		this.setGdRoot(gdRoot);
+		this.actions.push(new SimActionMoveEnemies());
+		this.actions.push(new SimActionSpawnEnemies());
+		this.actions.push(new SimActionFireTowers());
+		this.actions.push(new SimActionMoveProjectiles());
+	}
+
+	setGdRoot(gdRoot: GdRoot) {
+		this.gdRoot = gdRoot;
+		this.interval = 1.0 / this.gdRoot.simulation.stepsPerSecond;
+	}
+
+	fastForwardToEnd() {
+		this.fastForwardTo(
+			this.commandHistory[this.commandHistory.length - 1].step
+		);
+	}
+
+	private fastForwardTo(target: number) {
+		this.currentStep = 0;
+		while (this.currentStep < target) {
+			this.step();
+		}
+	}
+
+	step() {
+		const nextStep = this.currentStep + 1;
+
+		// Get all commands for this step
+		const commands = this.commandHistory.filter((c) => c.step === nextStep);
+
+		this.currentStep = nextStep;
+		for (const action of this.actions) {
+			action.execute(this);
+		}
+
+		for (const cmd of commands) {
+			cmd.execute(this);
+		}
+
+		this.lastStepTime = performance.now();
+	}
+
+	start(now: number) {
+		if (this.isRunning) return;
+
+		this.isRunning = true;
+		this.lastTime = now;
+	}
+
+	stop() {
+		this.isRunning = false;
+	}
+
+	addCommand(command: SimCommand) {
+		this.commandHistory = this.commandHistory.filter(
+			(c) => c.step < command.step
+		);
+		this.commandHistory.push(command);
+	}
+
+	update = (now: number) => {
+		if (!this.isRunning) return;
+
+		while (now - this.lastTime >= this.interval) {
+			this.step();
+			this.lastTime += this.interval;
+		}
+	};
+}

src/app/components/game/sim/SimProjectile.ts

@@ -0,0 +1,24 @@
+import { GdProjectileEffect } from "../data/GdProjectileEffect";
+import { Vector2 } from "../util/Vector2";
+
+export class SimProjectile {
+	index: number;
+	prevPosition: Vector2;
+	position: Vector2;
+	targetEnemyIdx: number;
+	spawnStep: number;
+	size: number;
+	dead: boolean;
+	projectileEffect: GdProjectileEffect;
+
+	constructor(spawnStep: number, index: number, position: Vector2, targetEnemyIdx: number, size: number, projectileEffect: GdProjectileEffect) {
+		this.index = index;
+		this.position = position.clone();
+		this.prevPosition = position.clone();
+		this.targetEnemyIdx = targetEnemyIdx;
+		this.spawnStep = spawnStep;
+		this.size = size;
+		this.projectileEffect = projectileEffect;
+		this.dead = false;
+	}
+}

src/app/components/game/sim/SimTower.ts

@@ -0,0 +1,91 @@
+import { GdProjectileEffect } from "../data/GdProjectileEffect";
+import { Vector2 } from "../util/Vector2";
+import { SimLevel } from "./SimLevel";
+import { SimProjectile } from "./SimProjectile";
+
+export class SimTower {
+	lastProjectileStep: number = -1;
+	lastAoeStep: number = -1;
+	projectileEffect: GdProjectileEffect | null = null;
+	projectileRange: number = -1;
+	projectileRate: number = -1;
+	projectileSize: number = -1;
+	aoeEffect: number = -1;
+	aoeRange: number = -1;
+	aoeRate: number = -1;
+	position: Vector2 = new Vector2(0, 0);
+	currentProjectileTarget: number = -1;
+	index: number = -1;
+
+    constructor(index: number, position: Vector2) {
+        this.index = index;
+        this.position = position;
+    }
+
+    public fireIfAble(level: SimLevel) {
+        const currentStep = level.currentStep;
+        if (this.canFireProjectile(level) && !!this.projectileEffect) {
+            level.projectiles.push(new SimProjectile(currentStep, level.projectiles.length, this.position, this.pickProjectileTarget(level), this.projectileSize, this.projectileEffect));
+            this.lastProjectileStep = currentStep;
+        }
+        if (this.canFireAoe(level)) {
+            // TODO
+        }
+    }
+
+    private canFireProjectile(level: SimLevel) {
+        if (!this.projectileEffect)
+            return false;
+
+        const currentStep = level.currentStep;
+        if (this.lastProjectileStep == -1 || this.lastProjectileStep + this.projectileRate < currentStep) {
+            return this.isEnemyInRange(level, this.projectileRange);
+        }
+        return false;
+    }
+
+    private canFireAoe(level: SimLevel) {
+        const currentStep = level.currentStep;
+        if (this.aoeEffect != null) {
+            if (this.lastAoeStep == -1 || this.lastAoeStep + this.aoeRate < currentStep) {
+                return this.isEnemyInRange(level, this.aoeRange);
+            }
+        }
+        return false;
+    }
+
+    private pickProjectileTarget(level: SimLevel) {
+        if (this.currentProjectileTarget != -1) {
+            return this.currentProjectileTarget;
+        }
+
+        let minLength = -1;
+        let candidate = -1;
+        for (let idx = 0; idx < level.enemies.length; idx++) {
+            const enemy = level.enemies[idx];
+            const delta = enemy.currentPathPosition.subtract(this.position);
+            const length = delta.magnitude();
+            if (enemy.path != null && length < this.projectileRange) {
+                const pathLength = enemy.path.length - enemy.currentPathIndex;
+                if (minLength == -1 || pathLength < minLength) {
+                    candidate = idx;
+                    minLength = pathLength;
+                }
+            }
+        }
+
+        return candidate;
+    }
+
+    private isEnemyInRange(level: SimLevel, range: number) {
+        for (const idx in level.enemies) {
+            const enemy = level.enemies[idx];
+            const delta = enemy.currentPathPosition.subtract(this.position);
+            const length = delta.magnitude();
+            if (length < range) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

src/app/components/game/sim/actions/ISimAction.ts

@@ -0,0 +1,5 @@
+import { SimMain } from "../SimMain";
+
+export interface ISimAction {
+    execute(simMain: SimMain): void;
+}

src/app/components/game/sim/actions/SimActionFireTowers.ts

@@ -0,0 +1,16 @@
+import { SimCell } from "../SimCell";
+import { SimMain } from "../SimMain";
+import { ISimAction } from "./ISimAction";
+
+export class SimActionFireTowers implements ISimAction {
+    public execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) return;
+
+        level.cells.forEach((simCell: SimCell) => {
+            if (simCell.tower != null) {
+                simCell.tower.fireIfAble(level);
+            }
+        });
+    }
+}

src/app/components/game/sim/actions/SimActionMoveEnemies.ts

@@ -0,0 +1,43 @@
+import { Hex } from "../../util/Hex";
+import { Vector2 } from "../../util/Vector2";
+import { SimEnemy } from "../SimEnemy";
+import { SimMain } from "../SimMain";
+import { ISimAction } from "./ISimAction";
+
+export class SimActionMoveEnemies implements ISimAction {
+    public execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) return;
+
+        const deadEnemies: number[] = [];
+        level.enemies.forEach((enemy: SimEnemy, idx: number) => {
+            if (enemy.dead)
+                deadEnemies.push(idx);
+        });
+
+        for (const idx of deadEnemies) {
+            level.enemies.splice(idx, 1);
+        }
+
+        for (const simEnemy of level.enemies) {
+            const duration = simEnemy.speed / simMain.gdRoot.simulation.stepsPerSecond;
+            const t = (level.currentStep - simEnemy.currentPathStep) * duration;
+            const path2 = level.cells[simEnemy.path[simEnemy.currentPathIndex + 1]];
+            if (!path2) {
+                simEnemy.dead = true;
+                return;
+            }
+
+            const hex2 = path2.hex;
+            const pos1 = simEnemy.currentPathPosition;
+            const pos2 = Hex.toWorld(hex2);
+            simEnemy.prevPosition = simEnemy.position;
+            simEnemy.position = Vector2.lerp(pos1, pos2, t);
+            if (t >= 1) {
+                simEnemy.currentPathIndex += 1;
+                simEnemy.currentPathStep = level.currentStep;
+                simEnemy.onPathUpdated(level);
+            }
+        }
+    }
+}

src/app/components/game/sim/actions/SimActionMoveProjectiles.ts

@@ -0,0 +1,41 @@
+import { SimMain } from "../SimMain";
+import { SimProjectile } from "../SimProjectile";
+import { ISimAction } from "./ISimAction";
+
+export class SimActionMoveProjectiles implements ISimAction {
+    public execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) return;
+        
+        const deadProjectiles: number[] = [];
+        level.projectiles.forEach((simProjectile: SimProjectile, idx: number) => {
+            if (simProjectile.dead)
+                deadProjectiles.push(idx);
+        });
+
+        for (const idx of deadProjectiles) {
+            level.projectiles.splice(idx, 1);
+        }
+
+        level.projectiles.forEach((simProjectile: SimProjectile) => {
+            const target = level.enemies[simProjectile.targetEnemyIdx];
+            if (!target || target.dead) {
+                simProjectile.dead = true;
+                return;
+            }
+
+            const pos1 = simProjectile.position;
+            const pos2 = target.position;
+            const dir = pos2.subtract(pos1);
+            const len = dir.magnitude();
+            let duration = simProjectile.projectileEffect.speed / simMain.gdRoot.simulation.stepsPerSecond;
+            if (len < duration) {
+                duration = len;
+                simProjectile.dead = true;
+                target.suffer(level, simProjectile.projectileEffect);
+            }
+            simProjectile.prevPosition = simProjectile.position;
+            simProjectile.position = pos1.add(dir.normalized().multiplyScalar(duration));
+        });
+    }
+}

src/app/components/game/sim/actions/SimActionSpawnEnemies.ts

@@ -0,0 +1,39 @@
+import { EEnemySize } from "../../data/EEnemySize";
+import { SimCommandStartNextWave } from "../commands/SimCommandStartNextWave";
+import { SimEnemy } from "../SimEnemy";
+import { SimMain } from "../SimMain";
+import { ISimAction } from "./ISimAction";
+
+export class SimActionSpawnEnemies implements ISimAction {
+    public execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) return;
+
+        const gdLevel = simMain.gdRoot.levels[level.index];
+        const step = level.currentStep;
+        const gdWave = gdLevel.waves[level.currentWave];
+        let spawnDelay = simMain.gdRoot.simulation.spawnDelay;
+        switch (gdWave.size) {
+            case EEnemySize.Huge:
+                spawnDelay *= 2;
+                break;
+            case EEnemySize.Tiny:
+                spawnDelay *= 0.5;
+                break;
+        }
+
+        if (level.enemiesLeftToSpawn > 0 && level.lastEnemySpawnStep + spawnDelay * simMain.gdRoot.simulation.stepsPerSecond <= level.currentStep) {
+            level.enemiesLeftToSpawn -= 1;
+            level.lastEnemySpawnStep = step;
+
+            const route = Math.floor(Math.random() * gdLevel.enemyRoutes.length);
+            const enemy = new SimEnemy(gdWave.enemy, route);
+            enemy.onPathUpdated(level);
+            level.enemies.push(enemy);
+        }
+
+        if (level.nextWaveStep == step && !!gdLevel.waves[level.currentWave + 1]) {
+            simMain.addCommand(new SimCommandStartNextWave());
+        }
+    }
+}

src/app/components/game/sim/commands/SimCommand.ts

@@ -0,0 +1,6 @@
+import { SimMain } from "../SimMain";
+
+export abstract class SimCommand {
+    step: number = -1;
+    abstract execute(simMain: SimMain): void;
+}

src/app/components/game/sim/commands/SimCommandBlockTerrain.ts

@@ -0,0 +1,32 @@
+import { Hex } from "../../util/Hex";
+import { ECellType } from "../ECellType";
+import { SimMain } from "../SimMain";
+import { SimCommand } from "./SimCommand";
+
+export class SimCommandBlockTerrain extends SimCommand {
+    private hex: Hex;
+
+    constructor(hex: Hex) {
+        super();
+        this.hex = hex;
+    }
+
+    public execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) return;
+
+        const cellIndex = level.getCellIndex(this.hex);
+        const cell = level.cells[cellIndex];
+        if (cell.type != ECellType.Free || cell.tower != null || !level.reservePaths(simMain.gdRoot, this.hex)) {
+            return;
+        }
+        cell.type = ECellType.Blocked;
+        level.updateBlockedType(cell);
+        for (let i = 0; i < 6; ++i) {
+            const neighbourHex = Hex.neighbour(cell.hex, i);
+            const neighbourIndex = level.getCellIndex(neighbourHex);
+            level.updateBlockedType(level.cells[neighbourIndex]);
+        }
+        level.updatePaths(simMain.gdRoot);
+    }
+}

src/app/components/game/sim/commands/SimCommandCreateTower.ts

@@ -0,0 +1,54 @@
+import { Hex } from "../../util/Hex";
+import { ECellType } from "../ECellType";
+import { SimEnemy } from "../SimEnemy";
+import { SimMain } from "../SimMain";
+import { SimTower } from "../SimTower";
+import { SimCommand } from "./SimCommand";
+
+export class SimCommandCreateTower extends SimCommand {
+    hex: Hex;
+    index: number;
+
+    constructor(hex: Hex, index: number) {
+        super();
+        this.hex = hex;
+        this.index = index;
+    }
+
+    public execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) {
+            return;
+        }
+
+        const cellIndex = level.getCellIndex(this.hex);
+        const cell = level.cells[cellIndex];
+        const towerData = simMain.gdRoot.towers[this.index];
+
+        if (cell.type != ECellType.Free) {
+            return;
+        }
+
+        if (cell.tower != null) {
+            return;
+        }
+
+        level.enemies.forEach((enemy: SimEnemy) => {
+            const hex = Hex.fromWorld(enemy.position);
+            const enemyCellIndex = level.getCellIndex(hex);
+            if (cellIndex == enemyCellIndex) {
+                return;
+            }
+        });
+
+        if (level.currency < towerData.cost) {
+            return;
+        }
+
+        if (level.reservePaths(simMain.gdRoot, this.hex)) {
+            level.currency -= towerData.cost;
+            cell.tower = new SimTower(this.index, Hex.toWorld(this.hex));
+            level.updatePaths(simMain.gdRoot);
+        }
+    }
+}

src/app/components/game/sim/commands/SimCommandStartNextWave.ts

@@ -0,0 +1,22 @@
+import { GdRoot } from "../../data/GdRoot";
+import { SimLevel } from "../SimLevel";
+import { SimMain } from "../SimMain";
+import { SimCommand } from "./SimCommand";
+
+export class SimCommandStartNextWave extends SimCommand {
+
+    execute(simMain: SimMain) {
+        const level = simMain.currentLevel;
+        if (!level) return;
+
+        const data = simMain.gdRoot.levels[level.index];
+        level.currentWave += 1;
+        if (!data.waves[level.currentWave]) {
+            level.paused = true;
+            return;
+        }
+        level.nextWaveStep = level.currentStep + simMain.gdRoot.simulation.waveDuration * simMain.gdRoot.simulation.stepsPerSecond - 1;
+        level.lastEnemySpawnStep = level.currentStep;
+        level.enemiesLeftToSpawn = data.waves[level.currentWave].amount;
+    }
+}

src/app/components/game/simulationEngine.ts

@@ -1,116 +0,0 @@
-import { Command } from './command';
-import { GameData } from './gameData';
-import { GameRules } from './gameRules';
-import { GameState } from './gameState';
-
-export class SimulationEngine {
-	interval: number = 50; // ms per step
-	lastTime = 0;
-	private frameRequestId: number | null = null;
-	private data: GameData;
-	private previousState: GameState | null = null;
-
-	currentStep = 0;
-	initialState: GameState;
-	state: GameState;
-	isRunning = false;
-	lastStepTime: number = 0;
-
-	constructor(
-		initialState: GameState,
-		private rules: typeof GameRules,
-		initialData: GameData
-	) {
-		this.initialState = initialState;
-		this.state = this.cloneState(this.initialState);
-		this.data = initialData;
-	}
-
-	setGameData(newData: GameData) {
-		this.data = newData;
-	}
-
-	reinitializeWithNewData(data: GameData) {
-		this.setGameData(data);
-		const rewound = JSON.parse(JSON.stringify(this.initialState));
-		rewound.tick = this.state.tick;
-		rewound.commandHistory = this.state.commandHistory.filter(
-			(c) => c.step <= rewound.tick
-		);
-		this.state = rewound;
-		this.fastForwardTo(this.currentStep);
-	}
-
-	fastForwardToEnd() {
-		this.fastForwardTo(
-			this.state.commandHistory[this.state.commandHistory.length - 1].step
-		);
-	}
-
-	private fastForwardTo(target: number) {
-		this.state.tick = 0;
-		while (this.state.tick < target) {
-			this.step();
-		}
-	}
-
-	step() {
-		this.previousState = this.cloneState(this.state);
-		this.rules.step(this.state, this.data);
-		this.currentStep = this.state.tick;
-		this.lastStepTime = performance.now();
-	}
-
-	start() {
-		if (this.isRunning) return;
-		this.isRunning = true;
-		this.lastTime = performance.now();
-		this.loop();
-	}
-
-	stop() {
-		this.isRunning = false;
-		if (this.frameRequestId) {
-			cancelAnimationFrame(this.frameRequestId);
-			this.frameRequestId = null;
-		}
-	}
-
-	rewindToZero() {
-		this.stop();
-		this.state = this.cloneState(this.initialState);
-		this.previousState = this.cloneState(this.state);
-		this.currentStep = 0;
-	}
-
-	issueCommand(command: Command) {
-		// Purge future commands
-		this.state.commandHistory = this.state.commandHistory.filter(
-			(c) => c.step < command.step
-		);
-		this.state.commandHistory.push(command);
-	}
-
-	getRenderStates(): [GameState, GameState] {
-		return [this.previousState ?? this.state, this.state];
-	}
-
-	cloneState(state: GameState): GameState {
-		return {
-			tick: state.tick,
-			commandHistory: [...state.commandHistory],
-			units: state.units.map((u) => ({ ...u })),
-		};
-	}
-
-	private loop = () => {
-		const now = performance.now();
-		while (now - this.lastTime >= this.interval) {
-			this.step();
-			this.lastTime += this.interval;
-		}
-		if (this.isRunning) {
-			this.frameRequestId = requestAnimationFrame(this.loop);
-		}
-	};
-}

src/app/components/game/util/EDirection.js

@@ -0,0 +1,12 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.EDirection = void 0;
+var EDirection;
+(function (EDirection) {
+    EDirection[EDirection["Right"] = 0] = "Right";
+    EDirection[EDirection["TopRight"] = 1] = "TopRight";
+    EDirection[EDirection["TopLeft"] = 2] = "TopLeft";
+    EDirection[EDirection["Left"] = 3] = "Left";
+    EDirection[EDirection["BottomLeft"] = 4] = "BottomLeft";
+    EDirection[EDirection["BottomRight"] = 5] = "BottomRight";
+})(EDirection || (exports.EDirection = EDirection = {}));

src/app/components/game/util/EDirection.ts

@@ -0,0 +1,8 @@
+export enum EDirection {
+    Right = 0,
+    TopRight = 1,
+    TopLeft = 2,
+    Left = 3,
+    BottomLeft = 4,
+    BottomRight = 5
+}

src/app/components/game/util/Hex.js

@@ -0,0 +1,97 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Hex = void 0;
+var Vector2_1 = require("./Vector2");
+var Cube = /** @class */ (function () {
+    function Cube(x, y, z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+    return Cube;
+}());
+var Hex = /** @class */ (function () {
+    function Hex(x, y) {
+        this.col = x;
+        this.row = y;
+    }
+    Hex.prototype.toWorld = function () {
+        return Hex.toWorld(this);
+    };
+    Hex.prototype.toPixel = function (size) {
+        return Hex.toPixel(this, size);
+    };
+    Hex.offsetDirections = [
+        [
+            new Hex(+1, 0),
+            new Hex(0, -1),
+            new Hex(-1, -1),
+            new Hex(-1, 0),
+            new Hex(-1, +1),
+            new Hex(0, +1)
+        ],
+        [
+            new Hex(+1, 0),
+            new Hex(+1, -1),
+            new Hex(0, -1),
+            new Hex(-1, 0),
+            new Hex(0, +1),
+            new Hex(+1, +1),
+            new Hex(+1, +1)
+        ]
+    ];
+    Hex.neighbour = function (hex, direction) {
+        var parity = hex.row & 1;
+        var dir = Hex.offsetDirections[parity][direction];
+        return new Hex(hex.col + dir.col, hex.row + dir.row);
+    };
+    Hex.distance = function (a, b) {
+        var ac = Hex.offsetToCube(a);
+        var bc = Hex.offsetToCube(b);
+        return Math.max(Math.abs(ac.x - bc.x), Math.abs(ac.y - bc.y), Math.abs(ac.z - bc.z));
+    };
+    Hex.offsetToCube = function (hex) {
+        var x = hex.col - (hex.row - (hex.row & 1)) / 2;
+        var z = hex.row;
+        var y = -x - z;
+        return new Cube(x, y, z);
+    };
+    Hex.toWorld = function (hex) {
+        var x = Math.sqrt(3) * (hex.col + 0.5 * (hex.row & 1));
+        var y = (3 / 2) * hex.row;
+        return new Vector2_1.Vector2(x, y);
+    };
+    Hex.fromWorld = function (coord) {
+        var q = (coord.x * Math.sqrt(3)) / 3 - coord.y / 3;
+        var r = (coord.y * 2) / 3;
+        var cube = new Cube(q, -q - r, r);
+        var rx = Math.round(cube.x);
+        var ry = Math.round(cube.y);
+        var rz = Math.round(cube.z);
+        var xDiff = Math.abs(rx - cube.x);
+        var yDiff = Math.abs(ry - cube.y);
+        var zDiff = Math.abs(rz - cube.z);
+        if (xDiff > yDiff && xDiff > zDiff) {
+            rx = -ry - rz;
+        }
+        else if (yDiff > zDiff) {
+            ry = -rx - rz;
+        }
+        else {
+            rz = -rx - ry;
+        }
+        var rounded = new Cube(rx, ry, rz);
+        var col = rounded.x + (rounded.z - (rounded.z & 1)) / 2;
+        var row = rounded.z;
+        return new Hex(col, row);
+    };
+    Hex.toPixel = function (hex, size) {
+        var w = Hex.toWorld(hex);
+        return new Vector2_1.Vector2(w.x * size, w.y * size);
+    };
+    Hex.fromPixel = function (coord, size) {
+        return Hex.fromWorld(new Vector2_1.Vector2(coord.x / size, coord.y / size));
+    };
+    return Hex;
+}());
+exports.Hex = Hex;

src/app/components/game/util/Hex.ts

@@ -0,0 +1,116 @@
+import { EDirection } from "./EDirection";
+import { Vector2 } from "./Vector2";
+
+class Cube {
+    x: number;
+    y: number;
+    z: number;
+
+    constructor(x: number, y: number, z: number) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+}
+
+export class Hex {
+    public col: number;
+    public row: number;
+
+    constructor(x: number, y: number) {
+        this.col = x;
+        this.row = y;
+    }
+
+    private static offsetDirections: Hex[][] = [
+        [
+            new Hex(+1, 0),
+            new Hex(0, -1),
+            new Hex(-1, -1),
+            new Hex(-1, 0),
+            new Hex(-1, +1),
+            new Hex(0, +1)
+        ],
+        [
+            new Hex(+1, 0),
+            new Hex(+1, -1),
+            new Hex(0, -1),
+            new Hex(-1, 0),
+            new Hex(0, +1),
+            new Hex(+1, +1),
+            new Hex(+1, +1)
+        ]
+    ];
+
+    public static neighbour = (hex: Hex, direction: EDirection): Hex => {
+        const parity = hex.row & 1;
+        const dir = Hex.offsetDirections[parity][direction];
+        return new Hex(hex.col + dir.col, hex.row + dir.row);
+    };
+
+    public static distance = (a: Hex, b: Hex): number => {
+        const ac = Hex.offsetToCube(a);
+        const bc = Hex.offsetToCube(b);
+        return Math.max(
+            Math.abs(ac.x - bc.x),
+            Math.abs(ac.y - bc.y),
+            Math.abs(ac.z - bc.z)
+        );
+    };
+
+    private static offsetToCube = (hex: Hex): Cube => {
+        const x = hex.col - (hex.row - (hex.row & 1)) / 2;
+        const z = hex.row;
+        const y = -x - z;
+        return new Cube(x, y, z);
+    };
+
+    public static toWorld = (hex: Hex): Vector2 => {
+        const x = Math.sqrt(3) * (hex.col + 0.5 * (hex.row & 1));
+        const y = (3 / 2) * hex.row;
+        return new Vector2(x, y);
+    };
+
+    public toWorld(): Vector2 {
+        return Hex.toWorld(this);
+    }
+
+    public static fromWorld = (coord: Vector2): Hex => {
+        const q = (coord.x * Math.sqrt(3)) / 3 - coord.y / 3;
+        const r = (coord.y * 2) / 3;
+        const cube = new Cube(q, -q - r, r);
+        let rx = Math.round(cube.x);
+        let ry = Math.round(cube.y);
+        let rz = Math.round(cube.z);
+
+        const xDiff = Math.abs(rx - cube.x);
+        const yDiff = Math.abs(ry - cube.y);
+        const zDiff = Math.abs(rz - cube.z);
+
+        if (xDiff > yDiff && xDiff > zDiff) {
+            rx = -ry - rz;
+        } else if (yDiff > zDiff) {
+            ry = -rx - rz;
+        } else {
+            rz = -rx - ry;
+        }
+
+        const rounded = new Cube(rx, ry, rz);
+        const col = rounded.x + (rounded.z - (rounded.z & 1)) / 2;
+        const row = rounded.z;
+        return new Hex(col, row);
+    };
+
+    public static toPixel = (hex: Hex, size: number): Vector2 => {
+        const w = Hex.toWorld(hex);
+        return new Vector2(w.x * size, w.y * size);
+    };
+
+    public toPixel(size: number): Vector2 {
+        return Hex.toPixel(this, size);
+    }
+
+    public static fromPixel = (coord: Vector2, size: number): Hex => {
+        return Hex.fromWorld(new Vector2(coord.x / size, coord.y / size));
+    };
+}

src/app/components/game/util/PathFinding.ts

@@ -0,0 +1,51 @@
+import { ECellType } from "../sim/ECellType";
+import { SimLevel } from "../sim/SimLevel";
+import { Hex } from "./Hex";
+
+export abstract class PathFinding {
+    public static bfs(level: SimLevel, startIndex: number, endIndex: number): number[] | null {
+        const listToExplore: number[] = [startIndex];
+        let cameFrom: number[] = new Array<number>(level.cells.length);
+        cameFrom.fill(-1);
+
+        while (listToExplore.length > 0) {
+            const nodeIndex = listToExplore.shift()!;
+            const cell = level.cells[nodeIndex];
+
+            for (let i = 0; i < 6; ++i) {
+                const neighbourHex = Hex.neighbour(cell.hex, i);
+                const neighbourIndex = level.getCellIndex(neighbourHex);
+
+                if (neighbourIndex === -1) {
+                    continue;
+                }
+
+                const neighbourCell = level.cells[neighbourIndex];
+                if (neighbourCell.type === ECellType.Blocked || neighbourCell.type === ECellType.Reserved || neighbourCell.tower !== null) {
+                    continue;
+                }
+
+                if (cameFrom[neighbourIndex] === -1) {
+                    cameFrom[neighbourIndex] = nodeIndex;
+
+                    if (neighbourIndex !== endIndex) {
+                        listToExplore.push(neighbourIndex);
+                    } else {
+                        let idx = neighbourIndex;
+                        const path: number[] = [idx];
+
+                        while (idx !== startIndex) {
+                            const prev = cameFrom[idx];
+                            idx = prev;
+                            path.unshift(idx);
+                        }
+
+                        return path;
+                    }
+                }
+            }
+        }
+
+        return null;
+    }
+}

src/app/components/game/util/Vector2.js

@@ -0,0 +1,74 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Vector2 = void 0;
+var Vector2 = /** @class */ (function () {
+    function Vector2(x, y) {
+        this.x = x;
+        this.y = y;
+    }
+    Vector2.lerp = function (a, b, t) {
+        return a.multiplyScalar(1 - t).add(b.multiplyScalar(t));
+    };
+    Vector2.prototype.add = function (vector) {
+        return new Vector2(this.x + vector.x, this.y + vector.y);
+    };
+    Vector2.prototype.subtract = function (vector) {
+        return new Vector2(this.x - vector.x, this.y - vector.y);
+    };
+    Vector2.prototype.multiplyScalar = function (scalar) {
+        return new Vector2(this.x * scalar, this.y * scalar);
+    };
+    Vector2.prototype.dot = function (vector) {
+        return this.x * vector.x + this.y * vector.y;
+    };
+    Vector2.prototype.cross = function (vector) {
+        return this.x * vector.y - this.y * vector.x;
+    };
+    Vector2.prototype.magnitude = function () {
+        return Math.sqrt(this.x * this.x + this.y * this.y);
+    };
+    Vector2.prototype.normalized = function () {
+        var magnitude = this.magnitude();
+        if (magnitude === 0) {
+            throw new Error("Cannot normalize a vector with magnitude 0");
+        }
+        return this.multiplyScalar(1 / magnitude);
+    };
+    Vector2.prototype.distance = function (vector) {
+        return Math.sqrt(Math.pow((this.x - vector.x), 2) + Math.pow((this.y - vector.y), 2));
+    };
+    Vector2.prototype.distanceSquared = function (vector) {
+        return Math.pow((this.x - vector.x), 2) + Math.pow((this.y - vector.y), 2);
+    };
+    Vector2.prototype.limit = function (max) {
+        var magnitude = this.magnitude();
+        if (magnitude > max) {
+            return this.normalized().multiplyScalar(max);
+        }
+        return this;
+    };
+    Vector2.prototype.angle = function () {
+        return Math.atan2(this.y, this.x);
+    };
+    Vector2.prototype.angleBetween = function (vector) {
+        var dotProd = this.dot(vector);
+        var magnitudes = this.magnitude() * vector.magnitude();
+        if (magnitudes === 0) {
+            throw new Error("Cannot calculate angle with a zero-magnitude vector");
+        }
+        return Math.acos(dotProd / magnitudes);
+    };
+    Vector2.prototype.clone = function () {
+        return new Vector2(this.x, this.y);
+    };
+    Vector2.prototype.equals = function (vector) {
+        return this.x === vector.x && this.y === vector.y;
+    };
+    Vector2.prototype.rotate = function (angle) {
+        var cos = Math.cos(angle);
+        var sin = Math.sin(angle);
+        return new Vector2(this.x * cos - this.y * sin, this.x * sin + this.y * cos);
+    };
+    return Vector2;
+}());
+exports.Vector2 = Vector2;

src/app/components/game/util/Vector2.ts

@@ -0,0 +1,91 @@
+export class Vector2 {
+    public x: number;
+    public y: number;
+
+    constructor(x: number, y: number) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public static lerp(a: Vector2, b: Vector2, t: number) {
+        return a.multiplyScalar(1 - t).add(b.multiplyScalar(t));
+    }
+
+    public add(vector: Vector2): Vector2 {
+        return new Vector2(this.x + vector.x, this.y + vector.y);
+    }
+
+    public subtract(vector: Vector2): Vector2 {
+        return new Vector2(this.x - vector.x, this.y - vector.y);
+    }
+
+    public multiplyScalar(scalar: number): Vector2 {
+        return new Vector2(this.x * scalar, this.y * scalar);
+    }
+
+    public dot(vector: Vector2): number {
+        return this.x * vector.x + this.y * vector.y;
+    }
+
+    public cross(vector: Vector2): number {
+        return this.x * vector.y - this.y * vector.x;
+    }
+
+    public magnitude(): number {
+        return Math.sqrt(this.x * this.x + this.y * this.y);
+    }
+
+    public normalized(): Vector2 {
+        const magnitude = this.magnitude();
+        if (magnitude === 0) {
+            throw new Error("Cannot normalize a vector with magnitude 0");
+        }
+        return this.multiplyScalar(1 / magnitude);
+    }
+
+    public distance(vector: Vector2): number {
+        return Math.sqrt((this.x - vector.x) ** 2 + (this.y - vector.y) ** 2);
+    }
+
+    public distanceSquared(vector: Vector2): number {
+        return (this.x - vector.x) ** 2 + (this.y - vector.y) ** 2;
+    }
+
+    public limit(max: number): Vector2 {
+        const magnitude = this.magnitude();
+        if (magnitude > max) {
+            return this.normalized().multiplyScalar(max);
+        }
+        return this;
+    }
+
+    public angle(): number {
+        return Math.atan2(this.y, this.x);
+    }
+
+    public angleBetween(vector: Vector2): number {
+        const dotProd = this.dot(vector);
+        const magnitudes = this.magnitude() * vector.magnitude();
+        if (magnitudes === 0) {
+            throw new Error("Cannot calculate angle with a zero-magnitude vector");
+        }
+        return Math.acos(dotProd / magnitudes);
+    }
+
+    public clone(): Vector2 {
+        return new Vector2(this.x, this.y);
+    }
+
+    public equals(vector: Vector2): boolean {
+        return this.x === vector.x && this.y === vector.y;
+    }
+
+    public rotate(angle: number): Vector2 {
+        const cos = Math.cos(angle);
+        const sin = Math.sin(angle);
+        return new Vector2(
+            this.x * cos - this.y * sin,
+            this.x * sin + this.y * cos
+        );
+    }
+}

src/app/components/splash/splash.component.ts

@@ -8,12 +8,16 @@ import { AssetPreloaderService } from '../../assetPreloaderService';
 	styleUrls: ['./splash.component.css'],
 })
 export class SplashComponent {
+	static assetPreloader: AssetPreloaderService = new AssetPreloaderService();
 	show: boolean = true;
-    assetPreloader: AssetPreloaderService = new AssetPreloaderService();
 	progress: number = 0;
 
 	constructor(private router: Router) {
-        this.assetPreloader.progress$.subscribe(p => this.progress = p);
-        this.assetPreloader.preload().then(() => this.router.navigate(['/menu']));
+		SplashComponent.assetPreloader.progress$.subscribe(
+			(p) => (this.progress = p)
+		);
+		SplashComponent.assetPreloader
+			.preload()
+			.then(() => this.router.navigate(['/menu']));
 	}
 }