examples/bassteroids/source/damagedealer.cpp

   1 #include "damagedealer.h"
   2 #include <msp/game/stage.h>
   3 #include "collider.h"
   4 #include "hittable.h"
   5 #include "physics.h"
   6
   7 using namespace Msp;
   8
   9 DamageDealer::DamageDealer(Game::Stage &s):
  10         System(s),
  11         observer(stage.get_event_bus())
  12 {
  13         declare_dependency<HitPoints>(UPDATE);
  14         declare_dependency<DamageSource>(READ_OLD);
  15         declare_dependency<Physics>(RUN_AFTER);
  16
  17         observer.observe<Events::Collision>([this](auto &e){ collision(e); });
  18 }
  19
  20 void DamageDealer::tick(Time::TimeDelta)
  21 {
  22         for(DamagingCollision &c: collisions)
  23         {
  24                 Game::Handle<HitPoints> hits1 = c.entity1->get_hitpoints();
  25                 Game::Handle<DamageSource> damage1 = c.entity1->get_damage();
  26                 Game::Handle<HitPoints> hits2 = c.entity2->get_hitpoints();
  27                 Game::Handle<DamageSource> damage2 = c.entity2->get_damage();
  28                 if(damage1 && hits2)
  29                         hits2->take_damage(damage1->get_amount(), damage1->get_type());
  30                 if(damage2 && hits1)
  31                         hits1->take_damage(damage2->get_amount(), damage2->get_type());
  32         }
  33         collisions.clear();
  34 }
  35
  36 void DamageDealer::collision(const Events::Collision &e)
  37 {
  38         Game::Handle<Hittable> hittable1 = dynamic_handle_cast<Hittable>(e.collider1->get_entity());
  39         Game::Handle<Hittable> hittable2 = dynamic_handle_cast<Hittable>(e.collider2->get_entity());
  40         if(hittable1 && hittable2)
  41                 collisions.emplace_back(hittable1, hittable2);
  42 }