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         bullet_setup{ .physical={ .body={ .mass=0.05f, .moment_of_inertia=0.04f }, .collider={ .type=ColliderType::CIRCLE, .radius=0.2f }},
  15                 .hittable={ .damaging=true, .hits={ .max_hits=1 }, .damage={ .amount=1, .type=0 }},
  16                 .mesh={ .object_name="Quaver.object" }}
  17 {
  18         declare_dependency<Game::Transform>(READ_OLD);
  19         declare_dependency<RigidBody>(UPDATE);
  20 }
  21
  22 void PlayerController::set_controls(Controls *c)
  23 {
  24         controls = c;
  25         if(!player_ship)
  26                 player_ship = Game::Owned<Ship>(stage.get_root(), player_setup);
  27 }
  28
  29 void PlayerController::tick(Time::TimeDelta dt)
  30 {
  31         if(!controls)
  32                 return;
  33
  34         float dt_secs = dt/Time::sec;
  35
  36         const Ship::Setup &setup = player_ship->get_setup();
  37         float thrust = setup.speed*setup.speed;
  38         float torque = setup.turn_rate*setup.turn_rate;
  39
  40         Game::Handle<Game::Transform> transform = player_ship->get_transform();
  41         LinAl::Vector<float, 2> fwd_dir = normalize(transform->get_world_matrix().column(0).slice<2>(0));
  42         Game::Handle<RigidBody> body = player_ship->get_body();
  43
  44         body->add_force(fwd_dir*(controls->forward.get_value()*thrust));
  45         const LinAl::Vector<float, 2> &velocity = body->get_velocity();
  46         float speed = velocity.norm();
  47         if(speed>1e-5)
  48                 body->add_force(velocity*-min(speed+setup.speed/speed, 1.0f/dt_secs));
  49
  50         body->add_torque(controls->turn_left.get_value()*torque);
  51         Geometry::Angle<float> angular_vel = body->get_angular_velocity();
  52         Geometry::Angle<float> angular_speed = abs(angular_vel);
  53         if(abs(angular_speed.radians())>1e-5)
  54                 body->add_torque(angular_vel.radians()*-min(angular_speed.radians()+setup.turn_rate/angular_speed.radians(), 1.0f/dt_secs));
  55
  56         if(controls->fire.was_pressed())
  57                 defer([this]{ fire(); });
  58
  59         controls->reset_edges();
  60 }
  61
  62 void PlayerController::deferred_tick()
  63 {
  64         System::deferred_tick();
  65         erase_if(bullets, [](Game::Handle<Bullet> b){ return !b->get_hitpoints()->is_alive(); });
  66 }
  67
  68 void PlayerController::fire()
  69 {
  70         Game::Handle<Game::Transform> player_tf = player_ship->get_transform();
  71         Game::Handle<RigidBody> player_body = player_ship->get_body();
  72
  73         Game::TransformValues tv;
  74         tv.position = (player_tf->get_world_matrix()*LinAl::Vector<float, 4>(2.0f, 0.0f, 0.0f, 1.0f)).slice<3>(0);
  75         tv.rotation = player_tf->get_rotation()*Geometry::Quaternion<float>::rotation(Geometry::Angle<float>::from_degrees(10), LinAl::Vector<float, 3>(0.0f, 0.0f, 1.0f));
  76         bullets.emplace_back(stage.get_root(), bullet_setup, tv);
  77         Game::Handle<Bullet> bullet = bullets.back();
  78         Game::Handle<RigidBody> bullet_body = bullet->get_body();
  79         bullet_body->set_velocity(player_body->get_velocity()+(player_tf->get_world_matrix()*LinAl::Vector<float, 4>(20.0f, 0.0f, 0.0f, 0.0f)).slice<2>(0));
  80 }