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  1. #include <veritas/utilities/strong_typedef.hpp>
  2. #include <veritas/veritas.hpp>
  3. #include <SFML/System.hpp>
  4. #include <SFML/Graphics.hpp>
  5. #include <cmath>
  6.  
  7. veritas_strong_typedef(sf::Vector2f, Velocity);
  8. veritas_strong_typedef(sf::Vector2f, Position);
  9. veritas_strong_typedef(sf::SphereShape, Graphics);
  10. struct Collider { float radius; };
  11.  
  12. namespace vt = veritas;
  13.  
  14. //***************************
  15.  
  16. auto& movement_group = vt::create_entity_group<Velocity, Position>();
  17. auto& collision_group = vt::create_entity_group<Collider, Position>();
  18. auto& graphics_group = vt::create_entity_group<Graphics, Position>();
  19.  
  20. //***************************
  21.  
  22. void movement_system(float dt)
  23. {
  24. 	for (auto& entity : movement_group)
  25. 	{
  26. 		auto& position = entity.get_component<Position>();
  27. 		auto& velocity = entity.get_component<Velocity>();
  28. 		position += dt * velocity;
  29. 	}
  30. }
  31.  
  32. void collision_system()
  33. {
  34. 	for (auto& entity1 : collision_group)
  35. 	{
  36. 		auto& position1 = entity1.get_component<Position>();
  37. 		auto& collider1 = entity1.get_component<Collider>();
  38. 		for (auto& entity2 : collision_group)
  39. 		{
  40. 			auto& position2 = entity2.get_component<Position>();
  41. 			auto& collider2 = entity2.get_component<Collider>();
  42.  
  43. 			auto distance = [](Position pos1, Position pos2){ 
  44. 							  Position diff = pos1 - pos2;
  45. 							  return sqrt(diff.x*diff.x + diff.y*diff.y);};
  46.  
  47. 			if (entity1.id != entity2.id && 
  48. 			    distance(position1, position2) < collider1.radius + collider2.radius)
  49. 			{
  50. 				vt::event_bus::store(CollisionEvent{entity1, entity2});
  51. 			}
  52. 		}
  53. 	}
  54. 	vt::event_bus::emit_stored<CollisionEvent>();
  55. }
  56.  
  57. void graphics_system(sf::RenderWindow& window)
  58. {
  59. 	window.clear();
  60. 	for (auto& entity : graphics_group)
  61. 	{
  62. 		auto& position = entity.get_component<Position>();
  63. 		auto& graphics = entity.get_component<Graphics>();
  64. 		graphics.setPosition(position);
  65. 		window.draw(graphics);
  66. 	}
  67. 	window.display();
  68. }
  69.  
  70. //****************************
  71.  
  72. void destroy_entities(const CollisionEvent& event)
  73. {
  74. 	vt::destroy_entity(event.e1);
  75. 	vt::destroy_entity(event.e2);
  76. }
  77.  
  78. //****************************
  79.  
  80. void create_sphere(Position pos, Velocity vel)
  81. {
  82. 	auto entity = vt::create_entity();
  83. 	entity.add_component<Position>(pos);
  84. 	entity.add_component<Velocity>(vel);
  85. 	auto& collider = entity.add_component<Collider>();
  86. 		collider.radius = 5;
  87. 	auto& graphics = entity.add_component<Graphics>();
  88. 		graphics.setSize(5);
  89. 		graphics.setFillColor(sf::Color::Red);
  90. }
  91.  
  92. int main()
  93. {
  94. 	vt::event_bus::subscribe<CollisionEvent>(destroy_entities);
  95.  
  96. 	sf::RenderWindow window(sf::VideoMode(800, 600), "veritas example");
  97.  
  98. 	sf::Clock clock;
  99.  
  100. 	float duration = 0;
  101.  
  102. 	for (int i = 0; i < 100; ++i)
  103. 	{
  104. 		create_sphere({rand() % 795, rand() % 595}, {rand() % 50, rand() % 50});
  105. 	}
  106.  
  107. 	while (window.isOpen())
  108. 	{
  109. 		duration += clock.restart().asSeconds();
  110. 		while (duration > 1/60.f)
  111. 		{
  112. 			vt::update_entity_groups();
  113. 			duration -= 1/60.f;
  114. 			movement_system(1/60.f);
  115. 			collision_system();
  116. 		}
  117. 		graphics_system();
  118. 	}
  119.  
  120. 	return 0;
  121. }
  122.  
  123.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp:1:48: fatal error: veritas/utilities/strong_typedef.hpp: No such file or directory
 #include <veritas/utilities/strong_typedef.hpp>
                                                ^
compilation terminated.
stdout 
Standard output is empty
https://ideone.com/5hqXku
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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