ecs.js

ComponentsStorage.define(
	COMPONENTS.TrapTrigger,
	{
		onStep: { type: "boolean" },
		trapId: { type: "string", description: "Leave empty to link to same entity" },
	},
);

ComponentsStorage.define(
	COMPONENTS.Trap,
	{
		radius: { type: "number" },
		damage: { type: "number" },
		force: { type: "number" },
		isReady: { type: "boolean", default: true },
		dmgType: { type: "string", subtype: "TrapDmgTypeDict" },
	},
);


PrefabStorage.add({
	id: Random.generateId(),
	name: "Fire trap",
	components: {
		[COMPONENTS.Name]: { key: "Trap" },
		[COMPONENTS.Visual]: { char: "_", color: "#CC8A8A" },
		[COMPONENTS.Position]: {},
		[COMPONENTS.Trap]: {
			radius: 3,
			damage: 15,
			force: 3,
			isReady: true,
			dmgType: "Fire",
		},
		[COMPONENTS.TrapTrigger]: {
			onStep: true,
		},
	},
});


class TrapTriggerSystem extends BaseSystem {
	constructor() {
		this.events.listen(EVENTS.MoveAction, bind(this.onMovedEvent, this));
	}

	onMovedEvent(event) {
		const target = event.entity;
		for (const entity of this.gameData.grid.getAt(event.toX, event.toY)) {
			const TrapTrigger = entity.TrapTrigger;
			if (TrapTrigger && TrapTrigger.onStep) {
				const trap = TrapTrigger.trapId ? this.gameData.world.entity(TrapTrigger.trapId) : entity;
				const trapEvent = {
					type: EVENTS.TrapTriggered,
					target: target,
					x: event.toX,
					y: event.toY,
					source: event,
					entity: trap,
				};
				this.events.raise(trapEvent);
			}
		}
	}
}

class TrapResolveSystem extends BaseSystem {
	constructor() {
		this.events.listen(EVENTS.TrapTriggered, bind(this.onTriggered, this));
	}

	onTriggered(event) {
		const trap = event.entity;
		const Trap = trap.Trap;
		const Position = trap.Position;
		if (Trap && Position && Trap.isReady) {
			Trap.isReady = false;

			const trapAction = {
				type: EVENTS.TrapTriggeredAction,
				trap,
			};
			this.events.raise(trapAction);

			const explosionEvent = {
				type: EVENTS.ExplosionIntent,
				x: Position.x,
				y: Position.y,
				radius: Trap.radius,
				damage: Trap.damage,
				force: Trap.force,
				dmgType: Trap.dmgType,
				source: trap,
				causalityId,
			};
			this.events.raise(explosionEvent);
		}
	}
}