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(stage.get_resources().get<AsteroidSetup>("asteroid1.roid.setup"))
  12 { }
  13
  14 void GameController::tick(Time::TimeDelta)
  15 {
  16         switch(state)
  17         {
  18         case LEVEL_START:
  19                 defer([this]{
  20                         uniform_real_distribution<float> sdist(-1, 1);
  21                         uniform_real_distribution<float> udist(0, 1);
  22                         for(unsigned i=0; i<level+2; ++i)
  23                         {
  24                                 asteroids.emplace_back(stage.get_root(), asteroid_setup);
  25                                 asteroids.back()->get_transform()->set_position({ sdist(rng)*32, sdist(rng)*18, 0.0f });
  26                                 Geometry::Angle<float> angle = Geometry::Angle<float>::from_turns(udist(rng));
  27                                 float speed = udist(rng)*7;
  28                                 asteroids.back()->get_body()->set_velocity({ cos(angle)*speed, sin(angle)*speed });
  29                         }
  30                         state = PLAYING;
  31                 });
  32                 break;
  33         case PLAYING:
  34                 break;
  35         default:
  36                 throw logic_error("Unimplemented state");
  37         }
  38 }
  39
  40 void GameController::deferred_tick()
  41 {
  42         System::deferred_tick();
  43         erase_if(asteroids, [](Game::Handle<Asteroid> a){ return !a->get_hitpoints()->is_alive(); });
  44 }