@ecs.registerSystem()
export class DOTSystem extends ecs.System {
    filter(): ecs.IMatcher {
        return ecs.allOf(DOTComp);
    }

    update(entities: ecs.Entity[]) {
        const delta = oops.timer.delta;
        
        entities.forEach(hero => {
            const dot = hero.get(DOTComp);
            dot.duration -= delta;

            // 每秒伤害
            if (dot.accumulator >= 1) {
                hero.get(HeroModelComp).hp -= dot.damagePerSec;
                dot.accumulator -= 1;
            }
            dot.accumulator += delta;

            // 效果结束
            if (dot.duration <= 0) {
                hero.remove(DOTComp);
            }
        });
    }
}