examples/bassteroids/source/gamecontroller.cpp

   1 #include "gamecontroller.h"
   2 #include <stdexcept>
   3 #include <msp/game/root.h>
   4 #include <msp/game/transform.h>
   5
   6 using namespace std;
   7 using namespace Msp;
   8
   9 GameController::GameController(Game::Stage &s):
  10         System(s),
  11         asteroid_setup{ .physical={ .body={ .mass=200, .moment_of_inertia=2160 }, .collider={ .type=ColliderType::CIRCLE, .radius=3.0f } },
  12                 .hittable={ .damaging=true, .hits={ .max_hits=3, .vulnerable_to=1 }, .damage={ .amount=10, .type=1 }},
  13                 .mesh={ .object_name="Asteroid 1.object" }}
  14 { }
  15
  16 void GameController::tick(Time::TimeDelta)
  17 {
  18         switch(state)
  19         {
  20         case LEVEL_START:
  21                 defer([this]{
  22                         uniform_real_distribution<float> sdist(-1, 1);
  23                         uniform_real_distribution<float> udist(0, 1);
  24                         for(unsigned i=0; i<level+2; ++i)
  25                         {
  26                                 asteroids.emplace_back(stage.get_root(), asteroid_setup);
  27                                 asteroids.back()->get_transform()->set_position({ sdist(rng)*32, sdist(rng)*18, 0.0f });
  28                                 Geometry::Angle<float> angle = Geometry::Angle<float>::from_turns(udist(rng));
  29                                 float speed = udist(rng)*7;
  30                                 asteroids.back()->get_body()->set_velocity({ cos(angle)*speed, sin(angle)*speed });
  31                         }
  32                         state = PLAYING;
  33                 });
  34                 break;
  35         case PLAYING:
  36                 break;
  37         default:
  38                 throw logic_error("Unimplemented state");
  39         }
  40 }
  41
  42 void GameController::deferred_tick()
  43 {
  44         System::deferred_tick();
  45         erase_if(asteroids, [](Game::Handle<Asteroid> a){ return !a->get_hitpoints()->is_alive(); });
  46 }