examples/bassteroids/source/playercontroller.cpp

   1 #include "playercontroller.h"
   2 #include <msp/game/root.h>
   3 #include <msp/game/stage.h>
   4 #include "controls.h"
   5
   6 using namespace std;
   7 using namespace Msp;
   8
   9 PlayerController::PlayerController(Game::Stage &s):
  10         System(s),
  11         player_setup{ .physical={ .body={ .mass=1, .moment_of_inertia=0.8f }, .collider={ .type=ColliderType::CIRCLE, .radius=0.8f }},
  12                 .mesh={ .object_name="Bass guitar.object" },
  13                 .speed=12.0f, .turn_rate=4.71f }
  14 { }
  15
  16 void PlayerController::set_controls(Controls *c)
  17 {
  18         controls = c;
  19         if(!player_ship)
  20                 player_ship = Game::Owned<Ship>(stage.get_root(), player_setup);
  21 }
  22
  23 void PlayerController::tick(Time::TimeDelta dt)
  24 {
  25         if(!controls)
  26                 return;
  27
  28         float dt_secs = dt/Time::sec;
  29
  30         const Ship::Setup &setup = player_ship->get_setup();
  31         float thrust = setup.speed*setup.speed;
  32         float torque = setup.turn_rate*setup.turn_rate;
  33
  34         Game::Handle<Game::Transform> transform = player_ship->get_transform();
  35         LinAl::Vector<float, 2> fwd_dir = normalize(transform->get_world_matrix().column(0).slice<2>(0));
  36         Game::Handle<RigidBody> body = player_ship->get_body();
  37
  38         body->add_force(fwd_dir*(controls->forward.get_value()*thrust));
  39         const LinAl::Vector<float, 2> &velocity = body->get_velocity();
  40         float speed = velocity.norm();
  41         if(speed>1e-5)
  42                 body->add_force(velocity*-min(speed+setup.speed/speed, 1.0f/dt_secs));
  43
  44         body->add_torque(controls->turn_left.get_value()*torque);
  45         Geometry::Angle<float> angular_vel = body->get_angular_velocity();
  46         Geometry::Angle<float> angular_speed = abs(angular_vel);
  47         if(abs(angular_speed.radians())>1e-5)
  48                 body->add_torque(angular_vel.radians()*-min(angular_speed.radians()+setup.turn_rate/angular_speed.radians(), 1.0f/dt_secs));
  49 }