ChaseSystem.ixx File

System for updating entity steering to chase targets. More...

Included Headers

#include <algorithm> #include <helios.engine.common.tags.SystemRole> #include <helios.engine.modules.physics.motion.components.SteeringComponent> #include <helios.engine.modules.spatial.transform.components.TranslationStateComponent> #include <helios.engine.modules.ai.components.ChaseComponent> #include <helios.engine.runtime.world.UpdateContext> #include <helios.engine.mechanics.lifecycle.components.Active> #include <helios.engine.runtime.world.GameWorld> #include <helios.engine.mechanics.lifecycle.components> #include <helios.core.units.Unit> #include <helios.engine.ecs.GameObject> #include <helios.math>

Namespaces Index

namespace	helios
namespace	engine
	Main engine module aggregating core infrastructure and game systems. More...
namespace	modules
	Domain-specific components and systems. More...
namespace	ai
	AI behavior modules for game entities. More...
namespace	systems
	AI behavior processing systems. More...

Classes Index

class	ChaseSystem
	System that steers entities towards their chase targets. More...

Description

System for updating entity steering to chase targets.

File Listing

The file content with the documentation metadata removed is:

1/**

2 * @file ChaseSystem.ixx

3 * @brief System for updating entity steering to chase targets.

4 */

5module;

6

7#include <algorithm>

8

9export module helios.engine.modules.ai.systems.ChaseSystem;

10

11

12import helios.math;

13

14import helios.core.units.Unit;

15

16import helios.engine.ecs.GameObject;

17import helios.engine.runtime.world.GameWorld;

18import helios.engine.runtime.world.UpdateContext;

19

20import helios.engine.modules.ai.components.ChaseComponent;

21import helios.engine.modules.physics.motion.components.SteeringComponent;

22

23import helios.engine.modules.spatial.transform.components.TranslationStateComponent;

24

25import helios.engine.mechanics.lifecycle.components.Active;

26

27import helios.engine.mechanics.lifecycle.components;

28

29using namespace helios::engine::mechanics::lifecycle::components;

30

31import helios.engine.common.tags.SystemRole;

32

33export namespace helios::engine::modules::ai::systems {

34

35 /**

36 * @brief System that steers entities towards their chase targets.

37 *

38 * Processes all entities with ChaseComponent, SteeringComponent, and

39 * TranslationStateComponent. Updates steering intent to face the target

40 * entity based on a cooldown timer.

41 *

42 * The system:

43 * 1 Finds the target entity by handle

44 * 2 Waits for the cooldown timer to expire

45 * 3 Calculates direction from entity to target

46 * 4 Sets steering intent to face that direction

47 */

48 class ChaseSystem {

49

50

51 public:

52

53 using EngineRoleTag = helios::engine::common::tags::SystemRole;

54 /**

55 * @brief Updates steering for all chasing entities.

56 *

57 * @param updateContext Context providing delta time and game world access.

58 */

59 void update(helios::engine::runtime::world::UpdateContext& updateContext) noexcept {

60

61 for (auto [entity, sc, cc, tsc, active] : updateContext.view<

62 helios::engine::modules::physics::motion::components::SteeringComponent,

63 helios::engine::modules::ai::components::ChaseComponent,

64 helios::engine::modules::spatial::transform::components::TranslationStateComponent,

65 helios::engine::mechanics::lifecycle::components::Active

66 >().whereEnabled()) {

67

68 const auto entityHandle = cc->target();

69

70 auto go = updateContext.find(entityHandle);

71

72 if (!go || !go->isActive() || go->has<DeadTagComponent>()) {

73 continue;

74 }

75

76 const auto* ttr = go->get<helios::engine::modules::spatial::transform::components::TranslationStateComponent>();

77 if (!ttr) {

78 continue;

79 }

80

81 cc->updateCooldownTimerBy(updateContext.deltaTime());

82

83 if (cc->cooldownTimer() < cc->cooldown()) {

84 continue;

85 }

86

87 cc->setCooldownTimer(0.0f);

88

89 const auto translation = tsc->translation();

90 const auto direction = (ttr->translation() - translation).normalize();

91

92 if (std::abs(direction.length() - 1.0f) > helios::math::EPSILON_LENGTH) {

93 continue;

94 }

95

96 sc->setSteeringIntent(direction, 1.0f);

97

98 }

99 }

100

101 };

102

103}

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