examples/bassteroids/source/damagedealer.cpp

   1 #include "damagedealer.h"
   2 #include <msp/game/stage.h>
   3 #include "collider.h"
   4 #include "hittable.h"
   5
   6 using namespace Msp;
   7
   8 DamageDealer::DamageDealer(Game::Stage &s):
   9         System(s),
  10         observer(stage.get_event_bus())
  11 {
  12         declare_dependency<HitPoints>(UPDATE);
  13         declare_dependency<DamageSource>(READ_OLD);
  14
  15         observer.observe<Events::Collision>([this](auto &e){ collision(e); });
  16 }
  17
  18 void DamageDealer::tick(Time::TimeDelta)
  19 {
  20         for(DamagingCollision &c: collisions)
  21         {
  22                 Game::Handle<HitPoints> hits1 = c.entity1->get_hitpoints();
  23                 Game::Handle<DamageSource> damage1 = c.entity1->get_damage();
  24                 Game::Handle<HitPoints> hits2 = c.entity2->get_hitpoints();
  25                 Game::Handle<DamageSource> damage2 = c.entity2->get_damage();
  26                 if(damage1 && hits2)
  27                         hits2->take_damage(damage1->get_amount(), damage1->get_type());
  28                 if(damage2 && hits1)
  29                         hits1->take_damage(damage2->get_amount(), damage2->get_type());
  30         }
  31         collisions.clear();
  32 }
  33
  34 void DamageDealer::collision(const Events::Collision &e)
  35 {
  36         Game::Handle<Hittable> hittable1 = dynamic_handle_cast<Hittable>(e.collider1->get_entity());
  37         Game::Handle<Hittable> hittable2 = dynamic_handle_cast<Hittable>(e.collider2->get_entity());
  38         if(hittable1 && hittable2)
  39                 collisions.emplace_back(hittable1, hittable2);
  40 }