8 files changed, 144 insertions, 5 deletions

diff --git a/src/crepe/api/AI.cpp b/src/crepe/api/AI.cpp
new file mode 100644
index 0000000..d785bb5
--- /dev/null
+++ b/src/crepe/api/AI.cpp
@@ -0,0 +1,7 @@
+#include "AI.h"
+
+namespace crepe {
+
+AI::AI(game_object_id_t id, float max_force) : Component(id), max_force(max_force) {}
+
+} // namespace crepe
diff --git a/src/crepe/api/AI.h b/src/crepe/api/AI.h
new file mode 100644
index 0000000..046426d
--- /dev/null
+++ b/src/crepe/api/AI.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include "Component.h"
+#include "types.h"
+
+namespace crepe {
+
+class AI : public Component {
+public:
+	enum BehaviorType {
+		NONE = 0x00000,
+		SEEK = 0x00002,
+		FLEE = 0x00004,
+		ARRIVE = 0x00008,
+		PATH_FOLLOW = 0x00010,
+	};
+
+public:
+	AI(game_object_id_t id, float max_force);
+
+	bool on(BehaviorType behavior) const { return (flags & behavior) == behavior; }
+	void seek_on() { flags |= SEEK; }
+	void seek_off() {
+		if (on(SEEK)) flags ^= SEEK;
+	}
+	void flee_on() { flags |= FLEE; }
+	void flee_off() {
+		if (on(FLEE)) flags ^= FLEE;
+	}
+	void arrive_on() { flags |= ARRIVE; }
+	void arrive_off() {
+		if (on(ARRIVE)) flags ^= ARRIVE;
+	}
+	void path_follow_on() { flags |= PATH_FOLLOW; }
+	void path_follow_off() {
+		if (on(PATH_FOLLOW)) flags ^= PATH_FOLLOW;
+	}
+
+public:
+	float max_force;
+
+	// The target to seek or arrive at
+	vec2 seek_target;
+	// The target to flee from
+	vec2 flee_target;
+	// The distance at which the entity will start to flee from the target
+	float square_flee_panic_distance = 100.0f * 100.0f;
+	// The deceleration rate for the arrive behavior (higher values will make the entity decelerate faster (less overshoot))
+	float arrive_deceleration = 2.0f;
+
+private:
+	int flags = 0;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index b2e3df8..9f61ef5 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(crepe PUBLIC
 	Script.cpp
 	Button.cpp
 	UIObject.cpp
+	AI.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -58,4 +59,5 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Asset.h
 	Button.h
 	UIObject.h
+	AI.h
 )
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
index b9e91dd..90308a7 100644
--- a/src/crepe/api/LoopManager.cpp
+++ b/src/crepe/api/LoopManager.cpp
@@ -1,3 +1,5 @@
+#include "../facade/SDLContext.h"
+#include "../system/AISystem.h"
 #include "../system/AnimatorSystem.h"
 #include "../system/CollisionSystem.h"
 #include "../system/InputSystem.h"
@@ -23,6 +25,7 @@ LoopManager::LoopManager() {
 	this->load_system<RenderSystem>();
 	this->load_system<ScriptSystem>();
 	this->load_system<InputSystem>();
+	this->load_system<AISystem>();
 }
 
 void LoopManager::process_input() { this->get_system<InputSystem>().update(); }
@@ -37,6 +40,7 @@ void LoopManager::fixed_update() {
 	EventManager & ev = this->mediator.event_manager;
 	ev.dispatch_events();
 	this->get_system<ScriptSystem>().update();
+	this->get_system<AISystem>().update();
 	this->get_system<PhysicsSystem>().update();
 	this->get_system<CollisionSystem>().update();
 }
@@ -47,13 +51,13 @@ void LoopManager::loop() {
 
 	while (game_running) {
 		timer.update();
-		
+
 		while (timer.get_lag() >= timer.get_fixed_delta_time()) {
 			this->process_input();
 			this->fixed_update();
 			timer.advance_fixed_update();
 		}
-		
+
 		this->update();
 		this->render();
 
@@ -75,4 +79,4 @@ void LoopManager::render() {
 	this->get_system<RenderSystem>().update();
 }
 
-void LoopManager::update() {}
+void LoopManager::update() { this->get_system<AnimatorSystem>().update(); }
diff --git a/src/crepe/api/Rigidbody.h b/src/crepe/api/Rigidbody.h
index b0a24f7..722a665 100644
--- a/src/crepe/api/Rigidbody.h
+++ b/src/crepe/api/Rigidbody.h
@@ -7,7 +7,6 @@
 
 #include "types.h"
 
-
 namespace crepe {
 
 /**
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index 1474a09..fa83152 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -3,10 +3,10 @@
 #include <vector>
 
 #include "../manager/EventManager.h"
-#include "system/CollisionSystem.h"
 #include "../manager/Mediator.h"
 #include "../types.h"
 #include "../util/OptionalRef.h"
+#include "system/CollisionSystem.h"
 
 namespace crepe {
 
diff --git a/src/crepe/api/Vector2.h b/src/crepe/api/Vector2.h
index c278c87..bf9d124 100644
--- a/src/crepe/api/Vector2.h
+++ b/src/crepe/api/Vector2.h
@@ -66,6 +66,30 @@ struct Vector2 {
 
 	//! Checks if this vector is not equal to another vector.
 	bool operator!=(const Vector2<T> & other) const;
+
+	//! Truncates the vector to a maximum length.
+	void truncate(T max);
+
+	//! Normalizes the vector (resulting in vector with a length of 1).
+	void normalize();
+
+	//! Returns the length of the vector.
+	T length() const;
+
+	//! Returns the squared length of the vector.
+	T length_squared() const;
+
+	//! Returns the dot product (inwendig product) of this vector and another vector.
+	T dot(const Vector2<T> & other) const;
+
+	//! Returns the distance between this vector and another vector.
+	T distance(const Vector2<T> & other) const;
+
+	//! Returns the squared distance between this vector and another vector.
+	T distance_squared(const Vector2<T> & other) const;
+
+	//! Returns the perpendicular vector to this vector.
+	Vector2 perpendicular() const;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Vector2.hpp b/src/crepe/api/Vector2.hpp
index cad15f8..ff53cb0 100644
--- a/src/crepe/api/Vector2.hpp
+++ b/src/crepe/api/Vector2.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <cmath>
+
 #include "Vector2.h"
 
 namespace crepe {
@@ -115,4 +117,50 @@ bool Vector2<T>::operator!=(const Vector2<T> & other) const {
 	return !(*this == other);
 }
 
+template <class T>
+void Vector2<T>::truncate(T max) {
+	if (length() > max) {
+		normalize();
+		*this *= max;
+	}
+}
+
+template <class T>
+void Vector2<T>::normalize() {
+	T len = length();
+	if (len > 0) {
+		*this /= len;
+	}
+}
+
+template <class T>
+T Vector2<T>::length() const {
+	return std::sqrt(x * x + y * y);
+}
+
+template <class T>
+T Vector2<T>::length_squared() const {
+	return x * x + y * y;
+}
+
+template <class T>
+T Vector2<T>::dot(const Vector2<T> & other) const {
+	return x * other.x + y * other.y;
+}
+
+template <class T>
+T Vector2<T>::distance(const Vector2<T> & other) const {
+	return (*this - other).length();
+}
+
+template <class T>
+T Vector2<T>::distance_squared(const Vector2<T> & other) const {
+	return (*this - other).length_squared();
+}
+
+template <class T>
+Vector2<T> Vector2<T>::perpendicular() const {
+	return {-y, x};
+}
+
 } // namespace crepe