merge `master` into `loek/audio`

85 files changed, 2062 insertions, 521 deletions

diff --git a/.clang-format b/.clang-format
index 3ae6c28..8ce4033 100644
--- a/.clang-format
+++ b/.clang-format
@@ -23,6 +23,7 @@ ReflowComments: false
 AlignEscapedNewlines: DontAlign
 BreakBeforeBinaryOperators: All
 AlwaysBreakTemplateDeclarations: Yes
+PackConstructorInitializers: CurrentLine
 ...
 
 # vim: ft=yaml
diff --git a/.gitignore b/.gitignore
index 180afb8..8bfb819 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,4 +15,4 @@ compile_commands.json
 CTestTestfile.cmake
 _deps
 CMakeUserPresets.json
-
+compile.sh
diff --git a/.gitmodules b/.gitmodules
index 481519b..2f64601 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -14,3 +14,11 @@
 	path = lib/sdl_image
 	url = https://github.com/libsdl-org/SDL_image
 	shallow = true
+[submodule "lib/sdl_ttf"]
+	path = lib/sdl_ttf
+	url = https://github.com/libsdl-org/SDL_ttf.git
+	shallow = true
+[submodule "lib/libdb"]
+	path = lib/libdb
+	url = https://github.com/berkeleydb/libdb
+	shallow = true
diff --git a/contributing.md b/contributing.md
index 8799057..3090727 100644
--- a/contributing.md
+++ b/contributing.md
@@ -54,8 +54,6 @@ that you can click on to open them.
   - Implementation details (if applicable)
 - Header files (`.h`) contain the following types of comments:
   - [Usage documentation](#documentation) (required)
-    > [!NOTE]
-    > Constructors/destructors aren't required to have a `\brief` description
   - Implementation details (if they affect the header)
   - Design/data structure decisions (if applicable)
 - <details><summary>
@@ -436,7 +434,8 @@ that you can click on to open them.
   ```
   </td></tr></table></details>
 - <details><summary>
-  Variables that are being moved always use the fully qualified <code>std::move</code>
+  Variables that are being moved always use the fully qualified
+  <code>std::move</code>
   </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
 
   ```cpp
@@ -652,6 +651,33 @@ that you can click on to open them.
   bool bar = 0;
   ```
   </td></tr></table></details>
+- <details><summary>
+  The reason for <code>friend</code> relations are documented
+  </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
+
+  ```cpp
+  //! ComponentManager calls the private constructor of this class
+  friend class ComponentManager;
+  ```
+  </td><td>
+
+  ```cpp
+  friend class ComponentManager;
+  ```
+  </td></tr></table></details>
+- <details><summary>
+  Do not <i>pick</i> fixed-width integer types (unless required)
+  </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
+
+  ```cpp
+  unsigned long long foo();
+  ```
+  </td><td>
+
+  ```cpp
+  uint64_t foo();
+  ```
+  </td></tr></table></details>
 
 ## CMakeLists-specific
 
@@ -702,6 +728,67 @@ that you can click on to open them.
   void foo();
   ```
   </td></tr></table></details>
+- <details><summary>
+  The default constructor and destructor aren't required to have a
+  <code>\brief</code> description
+  </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
+
+  ```cpp
+  Foo();
+  virtual ~Foo();
+  ```
+  </td><td>
+
+  ```cpp
+  //! Create instance of Foo
+  Foo();
+  //! Destroy instance of Foo
+  virtual ~Foo();
+  ```
+  </td></tr></table></details>
+- <details><summary>
+  Parameter direction shouldn't be specified using Doxygen
+  </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
+
+  ```cpp
+  /**
+   * \param bar  Reference to Bar
+   */
+  void foo(const Bar & bar);
+  ```
+  </td><td>
+
+  ```cpp
+  /**
+   * \param[in] bar  Reference to Bar
+   */
+  void foo(const Bar & bar);
+  ```
+  </td></tr></table></details>
+- <details><summary>
+  Deleted functions shouldn't have Doxygen comments
+  </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
+
+  ```cpp
+  // singleton
+  Foo(const Foo &) = delete;
+  Foo(Foo &&) = delete;
+  Foo & operator=(const Foo &) = delete;
+  Foo & operator=(Foo &&) = delete;
+  ```
+  </td><td>
+
+  ```cpp
+  //! Deleted copy constructor
+  Foo(const Foo &) = delete;
+  //! Deleted move constructor
+  Foo(Foo &&) = delete;
+  //! Deleted copy assignment operator
+  Foo & operator=(const Foo &) = delete;
+  //! Deleted move assignment operator
+  Foo & operator=(Foo &&) = delete;
+  ```
+  </td></tr></table></details>
 
 # Libraries
 
diff --git a/lib/SDL_ttf b/lib/SDL_ttf
deleted file mode 160000
-Subproject a3d0895c1b60c41ff9e85d9203ddd7485c014da
diff --git a/lib/libdb b/lib/libdb
new file mode 160000
+Subproject 5b7b02ae052442626af54c176335b67ecc613a3
diff --git a/lib/sdl_image b/lib/sdl_image
-Subproject c6c7278b86b5de1232b10de8f612ed05cf2d11f
+Subproject abcf63aa71b4e3ac32120fa9870a6500ddcdcc8
diff --git a/lib/sdl_ttf b/lib/sdl_ttf
new file mode 160000
+Subproject 4a318f8dfaa1bb6f10e0c5e54052e25d3c7f344
diff --git a/mwe/ecs-homemade/src/Components.cpp b/mwe/ecs-homemade/src/Components.cpp
index de8753e..0d62bd5 100644
--- a/mwe/ecs-homemade/src/Components.cpp
+++ b/mwe/ecs-homemade/src/Components.cpp
@@ -6,7 +6,9 @@ Component::Component() : mActive(true) {}
 Sprite::Sprite(std::string path) : mPath(path) {}
 
 Rigidbody::Rigidbody(int mass, int gravityScale, int bodyType)
-	: mMass(mass), mGravityScale(gravityScale), mBodyType(bodyType) {}
+	: mMass(mass),
+	  mGravityScale(gravityScale),
+	  mBodyType(bodyType) {}
 
 Colider::Colider(int size) : mSize(size) {}
 
diff --git a/mwe/ecs-homemade/src/GameObjectMax.cpp b/mwe/ecs-homemade/src/GameObjectMax.cpp
index b0c5af7..753c8e2 100644
--- a/mwe/ecs-homemade/src/GameObjectMax.cpp
+++ b/mwe/ecs-homemade/src/GameObjectMax.cpp
@@ -4,4 +4,8 @@
 
 GameObject::GameObject(std::uint32_t id, std::string name, std::string tag,
 					   int layer)
-	: mId(id), mName(name), mTag(tag), mActive(true), mLayer(layer) {}
+	: mId(id),
+	  mName(name),
+	  mTag(tag),
+	  mActive(true),
+	  mLayer(layer) {}
diff --git a/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp b/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
index 408d5aa..ff8fde4 100644
--- a/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
+++ b/mwe/ecs-memory-efficient/inc/ContiguousContainer.hpp
@@ -1,5 +1,6 @@
 template <typename T>
-ContiguousContainer<T>::ContiguousContainer() : mSize(0), mCapacity(10) {
+ContiguousContainer<T>::ContiguousContainer() : mSize(0),
+												mCapacity(10) {
 	// Allocate memory for 10 objects initially
 	mData = static_cast<T *>(malloc(mCapacity * sizeof(T)));
 	if (!mData) {
diff --git a/mwe/ecs-memory-efficient/src/Components.cpp b/mwe/ecs-memory-efficient/src/Components.cpp
index c8347b3..2ec8609 100644
--- a/mwe/ecs-memory-efficient/src/Components.cpp
+++ b/mwe/ecs-memory-efficient/src/Components.cpp
@@ -6,6 +6,8 @@ Component::Component() : mActive(true) {}
 Sprite::Sprite(std::string path) : mPath(path) {}
 
 Rigidbody::Rigidbody(int mass, int gravityScale, int bodyType)
-	: mMass(mass), mGravityScale(gravityScale), mBodyType(bodyType) {}
+	: mMass(mass),
+	  mGravityScale(gravityScale),
+	  mBodyType(bodyType) {}
 
 Colider::Colider(int size) : mSize(size) {}
diff --git a/mwe/ecs-memory-efficient/src/GameObjectMax.cpp b/mwe/ecs-memory-efficient/src/GameObjectMax.cpp
index b0c5af7..753c8e2 100644
--- a/mwe/ecs-memory-efficient/src/GameObjectMax.cpp
+++ b/mwe/ecs-memory-efficient/src/GameObjectMax.cpp
@@ -4,4 +4,8 @@
 
 GameObject::GameObject(std::uint32_t id, std::string name, std::string tag,
 					   int layer)
-	: mId(id), mName(name), mTag(tag), mActive(true), mLayer(layer) {}
+	: mId(id),
+	  mName(name),
+	  mTag(tag),
+	  mActive(true),
+	  mLayer(layer) {}
diff --git a/mwe/events/include/customTypes.h b/mwe/events/include/customTypes.h
index a5d8dc9..415b989 100644
--- a/mwe/events/include/customTypes.h
+++ b/mwe/events/include/customTypes.h
@@ -33,6 +33,8 @@ struct Collision {
 	// Constructor to initialize a Collision
 	Collision(int idA, int idB, const Vector2 & point, const Vector2 & normal,
 			  float depth)
-		: objectIdA(idA), objectIdB(idB), contactPoint(point),
+		: objectIdA(idA),
+		  objectIdB(idB),
+		  contactPoint(point),
 		  contactNormal(normal) {}
 };
diff --git a/mwe/events/include/eventHandler.h b/mwe/events/include/eventHandler.h
index aa8f63b..3a83b15 100644
--- a/mwe/events/include/eventHandler.h
+++ b/mwe/events/include/eventHandler.h
@@ -24,7 +24,8 @@ class EventHandlerWrapper : public IEventHandlerWrapper {
 public:
 	explicit EventHandlerWrapper(const EventHandler<EventType> & handler,
 								 const bool destroyOnSuccess = false)
-		: m_handler(handler), m_handlerType(m_handler.target_type().name()),
+		: m_handler(handler),
+		  m_handlerType(m_handler.target_type().name()),
 		  m_destroyOnSuccess(destroyOnSuccess) {
 		// std::cout << m_handlerType << std::endl;
 	}
diff --git a/mwe/events/src/event.cpp b/mwe/events/src/event.cpp
index 0c9f3ed..8ffa0b1 100644
--- a/mwe/events/src/event.cpp
+++ b/mwe/events/src/event.cpp
@@ -23,7 +23,9 @@ void Event::markHandled() { isHandled = true; }
 
 // KeyPressedEvent class methods
 KeyPressedEvent::KeyPressedEvent(int keycode)
-	: Event("KeyPressedEvent"), key(keycode), repeatCount(0) {}
+	: Event("KeyPressedEvent"),
+	  key(keycode),
+	  repeatCount(0) {}
 
 Keycode KeyPressedEvent::getKeyCode() const { return key; }
 
@@ -31,13 +33,16 @@ int KeyPressedEvent::getRepeatCount() const { return repeatCount; }
 
 // KeyReleasedEvent class methods
 KeyReleasedEvent::KeyReleasedEvent(int keycode)
-	: Event("KeyReleasedEvent"), key(keycode) {}
+	: Event("KeyReleasedEvent"),
+	  key(keycode) {}
 
 Keycode KeyReleasedEvent::getKeyCode() const { return key; }
 
 // MousePressedEvent class methods
 MousePressedEvent::MousePressedEvent(int mouseX, int mouseY)
-	: Event("MousePressedEvent"), mouseX(mouseX), mouseY(mouseY) {}
+	: Event("MousePressedEvent"),
+	  mouseX(mouseX),
+	  mouseY(mouseY) {}
 
 std::pair<int, int> MousePressedEvent::getMousePosition() const {
 	return {mouseX, mouseY};
@@ -45,26 +50,36 @@ std::pair<int, int> MousePressedEvent::getMousePosition() const {
 
 //Collision event
 CollisionEvent::CollisionEvent(Collision collision)
-	: collisionData(collision), Event("CollisionEvent") {}
+	: collisionData(collision),
+	  Event("CollisionEvent") {}
 
 Collision CollisionEvent::getCollisionData() const {
 	return this->collisionData;
 }
 
 TextSubmitEvent::TextSubmitEvent(std::string text)
-	: text(text), Event("TextSubmitEvent") {}
+	: text(text),
+	  Event("TextSubmitEvent") {}
 
 std::string TextSubmitEvent::getText() const { return this->text; }
 
 MouseReleasedEvent::MouseReleasedEvent(int x, int y, MouseButton button)
-	: mouseX(x), mouseY(y), button(button), Event("MouseReleased") {}
+	: mouseX(x),
+	  mouseY(y),
+	  button(button),
+	  Event("MouseReleased") {}
 std::pair<int, int> MouseReleasedEvent::getMousePosition() const {
 	return {mouseX, mouseY};
 }
 MouseClickEvent::MouseClickEvent(int x, int y, MouseButton button)
-	: mouseX(x), mouseY(y), button(button), Event("MouseClickEvent") {}
+	: mouseX(x),
+	  mouseY(y),
+	  button(button),
+	  Event("MouseClickEvent") {}
 MouseMovedEvent::MouseMovedEvent(int x, int y)
-	: mouseX(x), mouseY(y), Event("MouseMovedEvent") {}
+	: mouseX(x),
+	  mouseY(y),
+	  Event("MouseMovedEvent") {}
 std::pair<int, int> MouseClickEvent::getMousePosition() const {
 	return {mouseX, mouseY};
 }
diff --git a/mwe/events/src/main.cpp b/mwe/events/src/main.cpp
index d49cf74..f4e7390 100644
--- a/mwe/events/src/main.cpp
+++ b/mwe/events/src/main.cpp
@@ -11,7 +11,9 @@
 class PlayerDamagedEvent : public Event {
 public:
 	PlayerDamagedEvent(int damage, int playerID)
-		: Event("PlayerDamaged"), damage(damage), playerID(playerID) {}
+		: Event("PlayerDamaged"),
+		  damage(damage),
+		  playerID(playerID) {}
 
 	REGISTER_EVENT_TYPE(PlayerDamagedEvent);
 
diff --git a/mwe/events/src/uiObject.cpp b/mwe/events/src/uiObject.cpp
index 8405469..947d1a2 100644
--- a/mwe/events/src/uiObject.cpp
+++ b/mwe/events/src/uiObject.cpp
@@ -7,7 +7,9 @@ UIObject::UIObject(int width, int height) : width(width), height(height) {}
 Button::Button(int width, int height) : UIObject(width, height) {}
 
 Text::Text(int width, int height)
-	: UIObject(width, height), size(12), font(nullptr),
+	: UIObject(width, height),
+	  size(12),
+	  font(nullptr),
 	  color{255, 255, 255} { // Default size and color
 	alignment.horizontal = Alignment::Horizontal::CENTER;
 	alignment.vertical = Alignment::Vertical::MIDDLE;
@@ -15,8 +17,13 @@ Text::Text(int width, int height)
 }
 
 TextInput::TextInput(int width, int height)
-	: UIObject(width, height), textBuffer(""), placeholder(""), isActive(false),
-	  textColor{255, 255, 255}, backgroundColor{0, 0, 0}, maxLength(100),
+	: UIObject(width, height),
+	  textBuffer(""),
+	  placeholder(""),
+	  isActive(false),
+	  textColor{255, 255, 255},
+	  backgroundColor{0, 0, 0},
+	  maxLength(100),
 	  font(nullptr) {
 	alignment.horizontal = Alignment::Horizontal::LEFT;
 	alignment.vertical = Alignment::Vertical::TOP;
diff --git a/mwe/gameloop/src/gameObject.cpp b/mwe/gameloop/src/gameObject.cpp
index 78217c4..b33dc78 100644
--- a/mwe/gameloop/src/gameObject.cpp
+++ b/mwe/gameloop/src/gameObject.cpp
@@ -26,5 +26,10 @@ void GameObject::setVelY(float value) { velY = value; }
 
 GameObject::GameObject(std::string name, float x, float y, float width,
 					   float height, float velX, float velY)
-	: name(name), x(x), y(y), width(width), height(height), velX(velX),
+	: name(name),
+	  x(x),
+	  y(y),
+	  width(width),
+	  height(height),
+	  velX(velX),
 	  velY(velY) {}
diff --git a/readme.md b/readme.md
index 7cf044f..c83853d 100644
--- a/readme.md
+++ b/readme.md
@@ -16,12 +16,32 @@ This repository uses CMake (the makefile in the root of this repository is for
 running auxiliary tasks only). See [src/readme.md](src/readme.md) for detailed
 building instructions.
 
-## Installing libraries
+## Code style
+
+Please read [contributing.md](./contributing.md).
+
+## Libraries
+
+This project uses the following libraries
+
+|Name|Version|
+|-|-:|
+|`SDL2`|2.30.9|
+|`SDL2_image`|2.8.2|
+|`SDL_ttf`|2.22.0|
+|`SoLoud`|(latest git `master` version)|
+|Google Test (`GTest`)|1.15.2|
+|Berkeley DB (`libdb`)|5.3.21|
+
+> [!NOTE]
+> Most of these libraries are likely available from your package manager if you
+> are using Linux or MinGW. Make sure your entire distribution is up-to-date if
+> you are not using a rolling release distribution.
 
-The expected library (source) versions are included in this repository as git
-submodules, which may be used if your distro's package manager does not provide
-(recent enough versions of) them. To build any of the dependencies, make sure
-the submodules are initialized by running:
+The sources for all of the above libraries are also included in this repository
+as git submodules, which may be used if your distro's package manager does not
+provide (recent enough versions of) them. To build any of the libraries
+manually, make sure the submodules are initialized by running:
 
 ```
 $ git submodule update --init --recursive --depth 1
@@ -35,6 +55,7 @@ Then, follow these steps for each library you want to install:
    $ cd lib/sdl2
    $ cd lib/soloud/contrib
    $ cd lib/sdl_image
+   $ cd lib/sdl_ttf
    ```
 2. Use CMake to configure the build, run the build and install (run **all** of
    these):
@@ -44,6 +65,10 @@ Then, follow these steps for each library you want to install:
    # cmake --install build
    ```
 
+## Tooling
+
+- TODO
+
 ## Documentation
 
 API documentation is done using Doxygen. To generate the docs, run
@@ -51,7 +76,3 @@ API documentation is done using Doxygen. To generate the docs, run
 $ make doxygen
 ```
 
-## Code style
-
-Please read [contributing.md](./contributing.md).
-
diff --git a/src/crepe/Exception.cpp b/src/crepe/Exception.cpp
index f27d5a8..dab8f2e 100644
--- a/src/crepe/Exception.cpp
+++ b/src/crepe/Exception.cpp
@@ -6,9 +6,7 @@
 using namespace std;
 using namespace crepe;
 
-const char * Exception::what() {
-	return error.c_str();
-}
+const char * Exception::what() { return error.c_str(); }
 
 Exception::Exception(const char * fmt, ...) {
 	va_list args;
@@ -16,4 +14,3 @@ Exception::Exception(const char * fmt, ...) {
 	this->error = va_stringf(args, fmt);
 	va_end(args);
 }
-
diff --git a/src/crepe/Exception.h b/src/crepe/Exception.h
index e4a7bb8..6473043 100644
--- a/src/crepe/Exception.h
+++ b/src/crepe/Exception.h
@@ -17,7 +17,6 @@ protected:
 	Exception() = default;
 	//! Formatted error message
 	std::string error;
-
 };
 
-}
+} // namespace crepe
diff --git a/src/crepe/Particle.cpp b/src/crepe/Particle.cpp
index 4810e80..582edf4 100644
--- a/src/crepe/Particle.cpp
+++ b/src/crepe/Particle.cpp
@@ -2,19 +2,32 @@
 
 using namespace crepe;
 
-Particle::Particle() { this->active = false; }
-
-void Particle::reset(float lifespan, Position position, Position velocity) {
+void Particle::reset(uint32_t lifespan, const Vector2 & position,
+					 const Vector2 & velocity, double angle) {
+	// Initialize the particle state
 	this->time_in_life = 0;
 	this->lifespan = lifespan;
 	this->position = position;
 	this->velocity = velocity;
+	this->angle = angle;
 	this->active = true;
+	// Reset force accumulation
+	this->force_over_time = {0, 0};
+}
+
+void Particle::update() {
+	// Deactivate particle if it has exceeded its lifespan
+	if (++time_in_life >= lifespan) {
+		this->active = false;
+		return;
+	}
+
+	// Update velocity based on accumulated force and update position
+	this->velocity += force_over_time;
+	this->position += velocity;
 }
 
-void Particle::update(float deltaTime) {
-	time_in_life += deltaTime;
-	position.x += velocity.x * deltaTime;
-	position.y += velocity.y * deltaTime;
-	if (time_in_life >= lifespan) this->active = false;
+void Particle::stop_movement() {
+	// Reset velocity to halt movement
+	this->velocity = {0, 0};
 }
diff --git a/src/crepe/Particle.h b/src/crepe/Particle.h
index 21e691d..3eaebc3 100644
--- a/src/crepe/Particle.h
+++ b/src/crepe/Particle.h
@@ -1,22 +1,64 @@
 #pragma once
 
-#include "Position.h"
+#include <cstdint>
+
+#include "api/Vector2.h"
 
 namespace crepe {
 
+/**
+ * \brief Represents a particle in the particle emitter.
+ *
+ * This class stores information about a single particle, including its position,
+ * velocity, lifespan, and other properties. Particles can be updated over time
+ * to simulate movement and can also be reset or stopped.
+ */
 class Particle {
+	// TODO: add friend particleSsytem and rendersystem. Unit test will fail.
+
 public:
-	Position position;
-	// FIXME: `Position` is an awkward name for a 2D vector. See FIXME comment in
-	// api/Transform.h for fix proposal.
-	Position velocity;
-	float lifespan;
-	bool active;
+	//! Position of the particle in 2D space.
+	Vector2 position;
+	//! Velocity vector indicating the speed and direction of the particle.
+	Vector2 velocity;
+	//! Accumulated force affecting the particle over time.
+	Vector2 force_over_time;
+	//! Total lifespan of the particle in milliseconds.
+	uint32_t lifespan;
+	//! Active state of the particle; true if it is in use, false otherwise.
+	bool active = false;
+	//! The time the particle has been alive, in milliseconds.
+	uint32_t time_in_life = 0;
+	//! The angle at which the particle is oriented or moving.
+	double angle = 0;
 
-	Particle();
-	void reset(float lifespan, Position position, Position velocity);
-	void update(float deltaTime);
-	float time_in_life;
+	/**
+	 * \brief Resets the particle with new properties.
+	 *
+	 * This method initializes the particle with a specific lifespan, position,
+	 * velocity, and angle, marking it as active and resetting its life counter.
+	 *
+	 * \param lifespan  The lifespan of the particle in amount of updates.
+	 * \param position  The starting position of the particle.
+	 * \param velocity  The initial velocity of the particle.
+	 * \param angle     The angle of the particle's trajectory or orientation.
+	 */
+	void reset(uint32_t lifespan, const Vector2 & position,
+			   const Vector2 & velocity, double angle);
+	/**
+	 * \brief Updates the particle's state.
+	 *
+	 * Advances the particle's position based on its velocity and applies accumulated forces. 
+	 * Deactivates the particle if its lifespan has expired.
+	 */
+	void update();
+	/**
+	 * \brief Stops the particle's movement.
+	 *
+	 * Sets the particle's velocity to zero, effectively halting any further
+	 * movement.
+	 */
+	void stop_movement();
 };
 
 } // namespace crepe
diff --git a/src/crepe/ValueBroker.h b/src/crepe/ValueBroker.h
index 88988b4..d844d6a 100644
--- a/src/crepe/ValueBroker.h
+++ b/src/crepe/ValueBroker.h
@@ -23,10 +23,12 @@ public:
 	virtual const T & get();
 
 	typedef std::function<void(const T & target)> setter_t;
-	typedef std::function<const T & ()> getter_t;
+	typedef std::function<const T &()> getter_t;
+
 private:
 	setter_t setter;
 	getter_t getter;
+
 public:
 	/**
 	 * \param setter  Function that sets the variable
@@ -35,7 +37,6 @@ public:
 	ValueBroker(const setter_t & setter, const getter_t & getter);
 };
 
-}
+} // namespace crepe
 
 #include "ValueBroker.hpp"
-
diff --git a/src/crepe/ValueBroker.hpp b/src/crepe/ValueBroker.hpp
index 0d08333..5c3bed9 100644
--- a/src/crepe/ValueBroker.hpp
+++ b/src/crepe/ValueBroker.hpp
@@ -5,11 +5,9 @@
 namespace crepe {
 
 template <typename T>
-ValueBroker<T>::ValueBroker(const setter_t & setter, const getter_t & getter) :
-	setter(setter),
-	getter(getter)
-	{
-}
+ValueBroker<T>::ValueBroker(const setter_t & setter, const getter_t & getter)
+	: setter(setter),
+	  getter(getter) {}
 
 template <typename T>
 const T & ValueBroker<T>::get() {
@@ -21,5 +19,4 @@ void ValueBroker<T>::set(const T & value) {
 	this->setter(value);
 }
 
-}
-
+} // namespace crepe
diff --git a/src/crepe/api/Animator.cpp b/src/crepe/api/Animator.cpp
new file mode 100644
index 0000000..58fee2a
--- /dev/null
+++ b/src/crepe/api/Animator.cpp
@@ -0,0 +1,26 @@
+
+#include <cstdint>
+
+#include "util/log.h"
+
+#include "Animator.h"
+#include "Component.h"
+#include "Sprite.h"
+
+using namespace crepe;
+
+Animator::Animator(uint32_t id, Sprite & ss, int row, int col, int col_animator)
+	: Component(id),
+	  spritesheet(ss),
+	  row(row),
+	  col(col) {
+	dbg_trace();
+
+	animator_rect = spritesheet.sprite_rect;
+	animator_rect.h /= col;
+	animator_rect.w /= row;
+	animator_rect.x = 0;
+	animator_rect.y = col_animator * animator_rect.h;
+	this->active = false;
+}
+Animator::~Animator() { dbg_trace(); }
diff --git a/src/crepe/api/Animator.h b/src/crepe/api/Animator.h
new file mode 100644
index 0000000..def0240
--- /dev/null
+++ b/src/crepe/api/Animator.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#include <cstdint>
+
+#include "Component.h"
+#include "Sprite.h"
+
+namespace crepe {
+class AnimatorSystem;
+class SDLContext;
+
+/**
+ * \brief The Animator component is used to animate sprites by managing the movement
+ *        and frame changes within a sprite sheet.
+ *
+ * This component allows for controlling sprite animation through rows and columns of a sprite sheet.
+ * It can be used to play animations, loop them, or stop them.
+ */
+class Animator : public Component {
+
+public:
+	//TODO: need to implement this
+	void loop();
+	void stop();
+
+public:
+	/**
+	 * \brief Constructs an Animator object that will control animations for a sprite sheet.
+	 *
+	 * \param id The unique identifier for the component, typically assigned automatically.
+	 * \param spritesheet A reference to the Sprite object which holds the sprite sheet for animation.
+	 * \param row The maximum number of rows in the sprite sheet.
+	 * \param col The maximum number of columns in the sprite sheet.
+	 * \param col__animate The specific col index of the sprite sheet to animate. This allows selecting which col to animate from multiple col in the sheet.
+	 *
+	 * This constructor sets up the Animator with the given parameters, and initializes the animation system.
+	 */
+	Animator(uint32_t id, Sprite & spritesheet, int row, int col,
+			 int col_animate);
+
+	~Animator(); // dbg_trace
+	Animator(const Animator &) = delete;
+	Animator(Animator &&) = delete;
+	Animator & operator=(const Animator &) = delete;
+	Animator & operator=(Animator &&) = delete;
+
+private:
+	//! A reference to the Sprite sheet containing the animation frames.
+	Sprite & spritesheet;
+
+	//! The maximum number of columns in the sprite sheet.
+	const int col;
+
+	//! The maximum number of rows in the sprite sheet.
+	const int row;
+
+	//! The current col being animated.
+	int curr_col = 0;
+
+	//! The current row being animated.
+	int curr_row = 0;
+
+	Rect animator_rect;
+
+	//TODO: Is this necessary?
+	//int fps;
+
+private:
+	//! AnimatorSystem adjust the private member parameters of Animator;
+	friend class AnimatorSystem;
+
+	//! SDLContext reads the Animator member var's
+	friend class SDLContext;
+};
+} // namespace crepe
+//
diff --git a/src/crepe/api/AssetManager.h b/src/crepe/api/AssetManager.h
index fefbed9..86a9902 100644
--- a/src/crepe/api/AssetManager.h
+++ b/src/crepe/api/AssetManager.h
@@ -7,9 +7,19 @@
 
 namespace crepe {
 
+/**
+ * \brief The AssetManager is responsible for storing and managing assets over
+ * multiple scenes.
+ * 
+ * The AssetManager ensures that assets are loaded once and can be accessed
+ * across different scenes. It caches assets to avoid reloading them every time
+ * a scene is loaded. Assets are retained in memory until the AssetManager is
+ * destroyed, at which point the cached assets are cleared.
+ */
 class AssetManager {
 
 private:
+	//! A cache that holds all the assets, accessible by their file path, over multiple scenes.
 	std::unordered_map<std::string, std::any> asset_cache;
 
 private:
@@ -22,12 +32,32 @@ public:
 	AssetManager & operator=(const AssetManager &) = delete;
 	AssetManager & operator=(AssetManager &&) = delete;
 
+	/**
+	 * \brief Retrieves the singleton instance of the AssetManager.
+	 *
+	 * \return A reference to the single instance of the AssetManager.
+	 */
 	static AssetManager & get_instance();
 
 public:
-	template <typename asset>
-	std::shared_ptr<asset> cache(const std::string & file_path,
-								 bool reload = false);
+	/**
+	 * \brief Caches an asset by loading it from the given file path.
+	 *
+	 * \param file_path The path to the asset file to load.
+	 * \param reload If true, the asset will be reloaded from the file, even if
+	 * it is already cached.
+	 * \tparam T The type of asset to cache (e.g., texture, sound, etc.).
+	 * 
+	 * \return A shared pointer to the cached asset.
+	 * 
+	 * This template function caches the asset at the given file path. If the
+	 * asset is already cached and `reload` is false, the existing cached version
+	 * will be returned. Otherwise, the asset will be reloaded and added to the
+	 * cache.
+	 */
+	template <typename T>
+	std::shared_ptr<T> cache(const std::string & file_path,
+							 bool reload = false);
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/AudioSource.h b/src/crepe/api/AudioSource.h
index fd2b6f1..5bc70f9 100644
--- a/src/crepe/api/AudioSource.h
+++ b/src/crepe/api/AudioSource.h
@@ -11,7 +11,7 @@ namespace crepe {
 //! Audio source component
 class AudioSource : public Component {
 public:
-	AudioSource(game_object_id_t id, std::unique_ptr<Asset> audio_clip);
+	AudioSource(game_object_id_t id, const Asset & source);
 	virtual ~AudioSource() = default;
 
 public:
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 3b20142..85696c4 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -16,6 +16,10 @@ target_sources(crepe PUBLIC
 	Scene.cpp
 	SceneManager.cpp
 	Vector2.cpp
+	Camera.cpp
+	Animator.cpp
+	LoopManager.cpp
+	LoopTimer.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -38,4 +42,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Metadata.h
 	SceneManager.h
 	SceneManager.hpp
+	Camera.h
+	Animator.h
+	LoopManager.h
+	LoopTimer.h
 )
diff --git a/src/crepe/api/Camera.cpp b/src/crepe/api/Camera.cpp
new file mode 100644
index 0000000..6355a03
--- /dev/null
+++ b/src/crepe/api/Camera.cpp
@@ -0,0 +1,18 @@
+
+#include <cstdint>
+
+#include "util/log.h"
+
+#include "Camera.h"
+#include "Color.h"
+#include "Component.h"
+
+using namespace crepe;
+
+Camera::Camera(uint32_t id, const Color & bg_color)
+	: Component(id),
+	  bg_color(bg_color) {
+	dbg_trace();
+}
+
+Camera::~Camera() { dbg_trace(); }
diff --git a/src/crepe/api/Camera.h b/src/crepe/api/Camera.h
new file mode 100644
index 0000000..ba3a9ef
--- /dev/null
+++ b/src/crepe/api/Camera.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include <cstdint>
+
+#include "Color.h"
+#include "Component.h"
+
+namespace crepe {
+
+/**
+ * \class Camera
+ * \brief Represents a camera component for rendering in the game.
+ *
+ * The Camera class defines the view parameters, including background color, 
+ * aspect ratio, position, and zoom level. It controls what part of the game 
+ * world is visible on the screen.
+ */
+class Camera : public Component {
+
+public:
+	/**
+	 * \brief Constructs a Camera with the specified ID and background color.
+	 * \param id Unique identifier for the camera component.
+	 * \param bg_color Background color for the camera view.
+	 */
+	Camera(uint32_t id, const Color & bg_color);
+	~Camera(); // dbg_trace only
+
+public:
+	//! Background color of the camera view.
+	Color bg_color;
+
+	//! Aspect ratio height for the camera.
+	double aspect_height = 480;
+
+	//! Aspect ratio width for the camera.
+	double aspect_width = 640;
+
+	//! X-coordinate of the camera position.
+	double x = 0.0;
+
+	//! Y-coordinate of the camera position.
+	double y = 0.0;
+
+	//! Zoom level of the camera view.
+	double zoom = 1.0;
+
+public:
+	/**
+	 * \brief Gets the maximum number of camera instances allowed.
+	 * \return Maximum instance count as an integer.
+	 */
+	virtual int get_instances_max() const { return 10; }
+};
+} // namespace crepe
diff --git a/src/crepe/api/CircleCollider.h b/src/crepe/api/CircleCollider.h
index caa7e43..e77a592 100644
--- a/src/crepe/api/CircleCollider.h
+++ b/src/crepe/api/CircleCollider.h
@@ -6,7 +6,8 @@ namespace crepe {
 class CircleCollider : public Collider {
 public:
 	CircleCollider(game_object_id_t game_object_id, int radius)
-		: Collider(game_object_id), radius(radius) {}
+		: Collider(game_object_id),
+		  radius(radius) {}
 	int radius;
 };
 
diff --git a/src/crepe/api/Color.cpp b/src/crepe/api/Color.cpp
index fc6313d..9e5f187 100644
--- a/src/crepe/api/Color.cpp
+++ b/src/crepe/api/Color.cpp
@@ -11,8 +11,7 @@ Color Color::cyan = Color(0, 255, 255, 0);
 Color Color::yellow = Color(255, 255, 0, 0);
 Color Color::magenta = Color(255, 0, 255, 0);
 
-// FIXME: do we really need double precision for color values?
-Color::Color(double red, double green, double blue, double alpha) {
+Color::Color(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha) {
 	this->a = alpha;
 	this->r = red;
 	this->g = green;
diff --git a/src/crepe/api/Color.h b/src/crepe/api/Color.h
index 6b54888..aa47bf4 100644
--- a/src/crepe/api/Color.h
+++ b/src/crepe/api/Color.h
@@ -1,14 +1,17 @@
 #pragma once
 
+#include <cstdint>
+
 namespace crepe {
 
+// TODO: make Color a struct w/o constructors/destructors
 class Color {
 
 	// FIXME: can't these colors be defined as a `static constexpr const Color`
 	// instead?
 
 public:
-	Color(double red, double green, double blue, double alpha);
+	Color(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha);
 	static const Color & get_white();
 	static const Color & get_red();
 	static const Color & get_green();
@@ -19,10 +22,11 @@ public:
 	static const Color & get_black();
 
 private:
-	double r;
-	double g;
-	double b;
-	double a;
+	// TODO: why are these private!?
+	uint8_t r;
+	uint8_t g;
+	uint8_t b;
+	uint8_t a;
 
 	static Color white;
 	static Color red;
@@ -32,6 +36,9 @@ private:
 	static Color magenta;
 	static Color yellow;
 	static Color black;
+
+private:
+	friend class SDLContext;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Config.cpp b/src/crepe/api/Config.cpp
index d6206da..0100bcc 100644
--- a/src/crepe/api/Config.cpp
+++ b/src/crepe/api/Config.cpp
@@ -6,4 +6,3 @@ Config & Config::get_instance() {
 	static Config instance;
 	return instance;
 }
-
diff --git a/src/crepe/api/Config.h b/src/crepe/api/Config.h
index 56e3af5..8c9e643 100644
--- a/src/crepe/api/Config.h
+++ b/src/crepe/api/Config.h
@@ -7,6 +7,7 @@ namespace crepe {
 class Config {
 private:
 	Config() = default;
+
 public:
 	~Config() = default;
 
@@ -16,8 +17,8 @@ public:
 	// singleton
 	Config(const Config &) = delete;
 	Config(Config &&) = delete;
-	Config & operator = (const Config &) = delete;
-	Config & operator = (Config &&) = delete;
+	Config & operator=(const Config &) = delete;
+	Config & operator=(Config &&) = delete;
 
 public:
 	//! Logging-related settings
@@ -60,4 +61,3 @@ public:
 };
 
 } // namespace crepe
-
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
new file mode 100644
index 0000000..2e9823f
--- /dev/null
+++ b/src/crepe/api/LoopManager.cpp
@@ -0,0 +1,55 @@
+
+#include "../facade/SDLContext.h"
+#include "../system/RenderSystem.h"
+#include "../system/ScriptSystem.h"
+
+#include "LoopManager.h"
+#include "LoopTimer.h"
+
+using namespace crepe;
+
+LoopManager::LoopManager() {}
+void LoopManager::process_input() {
+	SDLContext::get_instance().handle_events(this->game_running);
+}
+void LoopManager::start() {
+	this->setup();
+	this->loop();
+}
+void LoopManager::set_running(bool running) { this->game_running = running; }
+
+void LoopManager::fixed_update() {}
+
+void LoopManager::loop() {
+	LoopTimer & timer = LoopTimer::get_instance();
+	timer.start();
+
+	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();
+
+		timer.enforce_frame_rate();
+	}
+}
+
+void LoopManager::setup() {
+	this->game_running = true;
+	LoopTimer::get_instance().start();
+	LoopTimer::get_instance().set_fps(60);
+}
+
+void LoopManager::render() {
+	if (this->game_running) {
+		RenderSystem::get_instance().update();
+	}
+}
+
+void LoopManager::update() { LoopTimer & timer = LoopTimer::get_instance(); }
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
new file mode 100644
index 0000000..2f03193
--- /dev/null
+++ b/src/crepe/api/LoopManager.h
@@ -0,0 +1,79 @@
+#pragma once
+
+#include <memory>
+
+class RenderSystem;
+class SDLContext;
+class LoopTimer;
+class ScriptSystem;
+class SoundSystem;
+class ParticleSystem;
+class PhysicsSystem;
+class AnimatorSystem;
+class CollisionSystem;
+namespace crepe {
+
+class LoopManager {
+public:
+	void start();
+	LoopManager();
+
+private:
+	/**
+	 * \brief Setup function for one-time initialization.
+	 *
+	 * This function initializes necessary components for the game.
+	 */
+	void setup();
+	/**
+	 * \brief Main game loop function.
+	 *
+	 * This function runs the main loop, handling game updates and rendering.
+	 */
+	void loop();
+
+	/**
+	 * \brief Function for handling input-related system calls.
+	 *
+	 * Processes user inputs from keyboard and mouse.
+	 */
+	void process_input();
+
+	/**
+	 * \brief Per-frame update.
+	 *
+	 * Updates the game state based on the elapsed time since the last frame.
+	 */
+	void update();
+
+	/**
+	 * \brief Late update which is called after update().
+	 *
+	 * This function can be used for final adjustments before rendering.
+	 */
+	void late_update();
+
+	/**
+	 * \brief Fixed update executed at a fixed rate.
+	 *
+	 * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
+	 */
+	void fixed_update();
+	/**
+	 * \brief Set game running variable
+	 *
+	 * \param running running (false = game shutdown, true = game running)
+	 */
+	void set_running(bool running);
+	/**
+	 * \brief Function for executing render-related systems.
+	 *
+	 * Renders the current state of the game to the screen.
+	 */
+	void render();
+
+	bool game_running = false;
+	//#TODO add system instances
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
new file mode 100644
index 0000000..8f09e41
--- /dev/null
+++ b/src/crepe/api/LoopTimer.cpp
@@ -0,0 +1,86 @@
+#include <chrono>
+
+#include "../facade/SDLContext.h"
+#include "../util/log.h"
+
+#include "LoopTimer.h"
+
+using namespace crepe;
+
+LoopTimer::LoopTimer() { dbg_trace(); }
+
+LoopTimer & LoopTimer::get_instance() {
+	static LoopTimer instance;
+	return instance;
+}
+
+void LoopTimer::start() {
+	this->last_frame_time = std::chrono::steady_clock::now();
+	this->elapsed_time = std::chrono::milliseconds(0);
+	this->elapsed_fixed_time = std::chrono::milliseconds(0);
+	this->delta_time = std::chrono::milliseconds(0);
+}
+
+void LoopTimer::update() {
+	auto current_frame_time = std::chrono::steady_clock::now();
+	// Convert to duration in seconds for delta time
+	this->delta_time
+		= std::chrono::duration_cast<std::chrono::duration<double>>(
+			current_frame_time - last_frame_time);
+
+	if (this->delta_time > this->maximum_delta_time) {
+		this->delta_time = this->maximum_delta_time;
+	}
+
+	this->delta_time *= this->game_scale;
+	this->elapsed_time += this->delta_time;
+	this->last_frame_time = current_frame_time;
+}
+
+double LoopTimer::get_delta_time() const { return this->delta_time.count(); }
+
+double LoopTimer::get_current_time() const {
+	return this->elapsed_time.count();
+}
+
+void LoopTimer::advance_fixed_update() {
+	this->elapsed_fixed_time += this->fixed_delta_time;
+}
+
+double LoopTimer::get_fixed_delta_time() const {
+	return this->fixed_delta_time.count();
+}
+
+void LoopTimer::set_fps(int fps) {
+	this->fps = fps;
+	// target time per frame in seconds
+	this->frame_target_time = std::chrono::seconds(1) / fps;
+}
+
+int LoopTimer::get_fps() const { return this->fps; }
+
+void LoopTimer::set_game_scale(double value) { this->game_scale = value; }
+
+double LoopTimer::get_game_scale() const { return this->game_scale; }
+void LoopTimer::enforce_frame_rate() {
+	std::chrono::steady_clock::time_point current_frame_time
+		= std::chrono::steady_clock::now();
+	std::chrono::milliseconds frame_duration
+		= std::chrono::duration_cast<std::chrono::milliseconds>(
+			current_frame_time - this->last_frame_time);
+
+	if (frame_duration < this->frame_target_time) {
+		std::chrono::milliseconds delay_time
+			= std::chrono::duration_cast<std::chrono::milliseconds>(
+				this->frame_target_time - frame_duration);
+		if (delay_time.count() > 0) {
+			SDLContext::get_instance().delay(delay_time.count());
+		}
+	}
+
+	this->last_frame_time = current_frame_time;
+}
+
+double LoopTimer::get_lag() const {
+	return (this->elapsed_time - this->elapsed_fixed_time).count();
+}
diff --git a/src/crepe/api/LoopTimer.h b/src/crepe/api/LoopTimer.h
new file mode 100644
index 0000000..85687be
--- /dev/null
+++ b/src/crepe/api/LoopTimer.h
@@ -0,0 +1,147 @@
+#pragma once
+
+#include <chrono>
+#include <cstdint>
+
+namespace crepe {
+
+class LoopTimer {
+public:
+	/**
+     * \brief Get the singleton instance of LoopTimer.
+     *
+     * \return A reference to the LoopTimer instance.
+     */
+	static LoopTimer & get_instance();
+
+	/**
+     * \brief Get the current delta time for the current frame.
+     *
+     * \return Delta time in seconds since the last frame.
+     */
+	double get_delta_time() const;
+
+	/**
+     * \brief Get the current game time.
+     *
+     * \note The current game time may vary from real-world elapsed time.
+     * It is the cumulative sum of each frame's delta time.
+     *
+     * \return Elapsed game time in seconds.
+     */
+	double get_current_time() const;
+
+	/**
+     * \brief Set the target frames per second (FPS).
+     *
+     * \param fps The desired frames rendered per second.
+     */
+	void set_fps(int fps);
+
+	/**
+     * \brief Get the current frames per second (FPS).
+     *
+     * \return Current FPS.
+     */
+	int get_fps() const;
+
+	/**
+     * \brief Get the current game scale.
+     *
+     * \return The current game scale, where 0 = paused, 1 = normal speed, and values > 1 speed up the game.
+     */
+	double get_game_scale() const;
+
+	/**
+     * \brief Set the game scale.
+     *
+     * \param game_scale The desired game scale (0 = pause, 1 = normal speed, > 1 = speed up).
+     */
+	void set_game_scale(double game_scale);
+
+private:
+	friend class LoopManager;
+
+	/**
+     * \brief Start the loop timer.
+     *
+     * Initializes the timer to begin tracking frame times.
+     */
+	void start();
+
+	/**
+     * \brief Enforce the frame rate limit.
+     *
+     * Ensures that the game loop does not exceed the target FPS by delaying
+     * frame updates as necessary.
+     */
+	void enforce_frame_rate();
+
+	/**
+     * \brief Get the fixed delta time for consistent updates.
+     *
+     * Fixed delta time is used for operations that require uniform time steps,
+     * such as physics calculations.
+     *
+     * \return Fixed delta time in seconds.
+     */
+	double get_fixed_delta_time() const;
+
+	/**
+     * \brief Get the accumulated lag in the game loop.
+     *
+     * Lag represents the difference between the target frame time and the
+     * actual frame time, useful for managing fixed update intervals.
+     *
+     * \return Accumulated lag in seconds.
+     */
+	double get_lag() const;
+
+	/**
+     * \brief Construct a new LoopTimer object.
+     *
+     * Private constructor for singleton pattern to restrict instantiation
+     * outside the class.
+     */
+	LoopTimer();
+
+	/**
+     * \brief Update the timer to the current frame.
+     *
+     * Calculates and updates the delta time for the current frame and adds it to
+     * the cumulative game time.
+     */
+	void update();
+
+	/**
+     * \brief Advance the game loop by a fixed update interval.
+     *
+     * This method progresses the game state by a consistent, fixed time step,
+     * allowing for stable updates independent of frame rate fluctuations.
+     */
+	void advance_fixed_update();
+
+private:
+	//! Current frames per second
+	int fps = 50;
+	//! Current game scale
+	double game_scale = 1;
+	//! Maximum delta time in seconds to avoid large jumps
+	std::chrono::duration<double> maximum_delta_time{0.25};
+	//! Delta time for the current frame in seconds
+	std::chrono::duration<double> delta_time{0.0};
+	//! Target time per frame in seconds
+	std::chrono::duration<double> frame_target_time
+		= std::chrono::seconds(1) / fps;
+	//! Fixed delta time for fixed updates in seconds
+	std::chrono::duration<double> fixed_delta_time
+		= std::chrono::seconds(1) / 50;
+	//! Total elapsed game time in seconds
+	std::chrono::duration<double> elapsed_time{0.0};
+	//! Total elapsed time for fixed updates in seconds
+	std::chrono::duration<double> elapsed_fixed_time{0.0};
+	//! Time of the last frame
+	std::chrono::steady_clock::time_point last_frame_time;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/Metadata.cpp b/src/crepe/api/Metadata.cpp
index 76f11d7..d421de5 100644
--- a/src/crepe/api/Metadata.cpp
+++ b/src/crepe/api/Metadata.cpp
@@ -4,4 +4,6 @@ using namespace crepe;
 using namespace std;
 
 Metadata::Metadata(game_object_id_t id, const string & name, const string & tag)
-	: Component(id), name(name), tag(tag) {}
+	: Component(id),
+	  name(name),
+	  tag(tag) {}
diff --git a/src/crepe/api/ParticleEmitter.cpp b/src/crepe/api/ParticleEmitter.cpp
index 3b2e2f2..35f960d 100644
--- a/src/crepe/api/ParticleEmitter.cpp
+++ b/src/crepe/api/ParticleEmitter.cpp
@@ -1,36 +1,12 @@
-#include <ctime>
-#include <iostream>
-
-#include "Particle.h"
 #include "ParticleEmitter.h"
 
 using namespace crepe;
 
-ParticleEmitter::ParticleEmitter(game_object_id_t id, uint32_t max_particles,
-								 uint32_t emission_rate, uint32_t speed,
-								 uint32_t speed_offset, uint32_t angle,
-								 uint32_t angleOffset, float begin_lifespan,
-								 float end_lifespan)
-	: Component(id), max_particles(max_particles), emission_rate(emission_rate),
-	  speed(speed), speed_offset(speed_offset), position{0, 0},
-	  begin_lifespan(begin_lifespan), end_lifespan(end_lifespan) {
-	std::srand(
-		static_cast<uint32_t>(std::time(nullptr))); // initialize random seed
-	std::cout << "Create emitter" << std::endl;
-	// FIXME: Why do these expressions start with `360 +`, only to be `% 360`'d
-	// right after? This does not make any sense to me.
-	min_angle = (360 + angle - (angleOffset % 360)) % 360;
-	max_angle = (360 + angle + (angleOffset % 360)) % 360;
-	position.x = 400; // FIXME: what are these magic values?
-	position.y = 400;
-	for (size_t i = 0; i < max_particles; i++) {
-		this->particles.emplace_back();
-	}
-}
-
-ParticleEmitter::~ParticleEmitter() {
-	std::vector<Particle>::iterator it = this->particles.begin();
-	while (it != this->particles.end()) {
-		it = this->particles.erase(it);
+ParticleEmitter::ParticleEmitter(game_object_id_t game_object_id,
+								 const Data & data)
+	: Component(game_object_id),
+	  data(data) {
+	for (size_t i = 0; i < this->data.max_particles; i++) {
+		this->data.particles.emplace_back();
 	}
 }
diff --git a/src/crepe/api/ParticleEmitter.h b/src/crepe/api/ParticleEmitter.h
index 5939723..a9e872f 100644
--- a/src/crepe/api/ParticleEmitter.h
+++ b/src/crepe/api/ParticleEmitter.h
@@ -1,42 +1,85 @@
 #pragma once
 
-#include <cstdint>
 #include <vector>
 
 #include "Component.h"
 #include "Particle.h"
+#include "Vector2.h"
 
 namespace crepe {
 
+class Sprite;
+
+/**
+ * \brief Data holder for particle emission parameters.
+ *
+ * The ParticleEmitter class stores configuration data for particle properties,
+ * defining the characteristics and boundaries of particle emissions.
+ */
 class ParticleEmitter : public Component {
 public:
-	ParticleEmitter(game_object_id_t id, uint32_t max_particles,
-					uint32_t emission_rate, uint32_t speed,
-					uint32_t speed_offset, uint32_t angle, uint32_t angleOffset,
-					float begin_lifespan, float end_lifespan);
-	~ParticleEmitter();
-
-	//! position of the emitter
-	Position position;
-	//! maximum number of particles
-	uint32_t max_particles;
-	//! rate of particle emission
-	uint32_t emission_rate;
-	//! base speed of the particles
-	uint32_t speed;
-	//! offset for random speed variation
-	uint32_t speed_offset;
-	//! min angle of particle emission
-	uint32_t min_angle;
-	//! max angle of particle emission
-	uint32_t max_angle;
-	//! begin Lifespan of particle (only visual)
-	float begin_lifespan;
-	//! begin Lifespan of particle
-	float end_lifespan;
-
-	//! collection of particles
-	std::vector<Particle> particles;
+	/**
+	 * \brief Defines the boundary within which particles are constrained.
+	 *
+	 * This structure specifies the boundary's size and offset, as well as the
+	 * behavior of particles upon reaching the boundary limits.
+	 */
+	struct Boundary {
+		//! boundary width (midpoint is emitter location)
+		double width = 0.0;
+		//! boundary height (midpoint is emitter location)
+		double height = 0.0;
+		//! boundary offset from particle emitter location
+		Vector2 offset;
+		//! reset on exit or stop velocity and set max postion
+		bool reset_on_exit = false;
+	};
+
+	/**
+	 * \brief Holds parameters that control particle emission.
+	 *
+	 * Contains settings for the emitter’s position, particle speed, angle, lifespan,
+	 * boundary, and the sprite used for rendering particles.
+	 */
+	struct Data {
+		//! position of the emitter
+		Vector2 position;
+		//! maximum number of particles
+		const unsigned int max_particles = 0;
+		//! rate of particle emission per update (Lowest value = 0.001 any lower is ignored)
+		double emission_rate = 0;
+		//! min speed of the particles
+		double min_speed = 0;
+		//! min speed of the particles
+		double max_speed = 0;
+		//! min angle of particle emission
+		double min_angle = 0;
+		//! max angle of particle emission
+		double max_angle = 0;
+		//! begin Lifespan of particle (only visual)
+		double begin_lifespan = 0.0;
+		//! end Lifespan of particle
+		double end_lifespan = 0.0;
+		//! force over time (physics)
+		Vector2 force_over_time;
+		//! particle boundary
+		Boundary boundary;
+		//! collection of particles
+		std::vector<Particle> particles;
+		//! sprite reference
+		const Sprite & sprite;
+	};
+
+public:
+	/**
+	 * \param game_object_id  Identifier for the game object using this emitter.
+	 * \param data            Configuration data defining particle properties.
+	 */
+	ParticleEmitter(game_object_id_t game_object_id, const Data & data);
+
+public:
+	//! Configuration data for particle emission settings.
+	Data data;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Rigidbody.cpp b/src/crepe/api/Rigidbody.cpp
index cbf1325..3bf1c5b 100644
--- a/src/crepe/api/Rigidbody.cpp
+++ b/src/crepe/api/Rigidbody.cpp
@@ -3,7 +3,8 @@
 using namespace crepe;
 
 crepe::Rigidbody::Rigidbody(uint32_t game_object_id, const Data & data)
-	: Component(game_object_id), data(data) {}
+	: Component(game_object_id),
+	  data(data) {}
 
 void crepe::Rigidbody::add_force_linear(const Vector2 & force) {
 	this->data.linear_velocity += force;
diff --git a/src/crepe/api/SaveManager.cpp b/src/crepe/api/SaveManager.cpp
index 23587e4..43276c5 100644
--- a/src/crepe/api/SaveManager.cpp
+++ b/src/crepe/api/SaveManager.cpp
@@ -2,8 +2,8 @@
 #include "../util/log.h"
 
 #include "Config.h"
-#include "ValueBroker.h"
 #include "SaveManager.h"
+#include "ValueBroker.h"
 
 using namespace std;
 using namespace crepe;
@@ -65,17 +65,33 @@ string SaveManager::deserialize(const string & value) const noexcept {
 	return value;
 }
 
-template <> uint8_t SaveManager::deserialize(const string & value) const noexcept { return deserialize<uint64_t>(value); }
-template <> int8_t SaveManager::deserialize(const string & value) const noexcept { return deserialize<int64_t>(value); }
-template <> uint16_t SaveManager::deserialize(const string & value) const noexcept { return deserialize<uint64_t>(value); }
-template <> int16_t SaveManager::deserialize(const string & value) const noexcept { return deserialize<int64_t>(value); }
-template <> uint32_t SaveManager::deserialize(const string & value) const noexcept { return deserialize<uint64_t>(value); }
-template <> int32_t SaveManager::deserialize(const string & value) const noexcept { return deserialize<int64_t>(value); }
-
-SaveManager::SaveManager() {
-	dbg_trace();
+template <>
+uint8_t SaveManager::deserialize(const string & value) const noexcept {
+	return deserialize<uint64_t>(value);
+}
+template <>
+int8_t SaveManager::deserialize(const string & value) const noexcept {
+	return deserialize<int64_t>(value);
+}
+template <>
+uint16_t SaveManager::deserialize(const string & value) const noexcept {
+	return deserialize<uint64_t>(value);
+}
+template <>
+int16_t SaveManager::deserialize(const string & value) const noexcept {
+	return deserialize<int64_t>(value);
+}
+template <>
+uint32_t SaveManager::deserialize(const string & value) const noexcept {
+	return deserialize<uint64_t>(value);
+}
+template <>
+int32_t SaveManager::deserialize(const string & value) const noexcept {
+	return deserialize<int64_t>(value);
 }
 
+SaveManager::SaveManager() { dbg_trace(); }
+
 SaveManager & SaveManager::get_instance() {
 	dbg_trace();
 	static SaveManager instance;
@@ -118,17 +134,19 @@ template void SaveManager::set(const string &, const double &);
 
 template <typename T>
 ValueBroker<T> SaveManager::get(const string & key, const T & default_value) {
-	if (!this->has(key))
-		this->set<T>(key, default_value);
+	if (!this->has(key)) this->set<T>(key, default_value);
 	return this->get<T>(key);
 }
 template ValueBroker<uint8_t> SaveManager::get(const string &, const uint8_t &);
 template ValueBroker<int8_t> SaveManager::get(const string &, const int8_t &);
-template ValueBroker<uint16_t> SaveManager::get(const string &, const uint16_t &);
+template ValueBroker<uint16_t> SaveManager::get(const string &,
+												const uint16_t &);
 template ValueBroker<int16_t> SaveManager::get(const string &, const int16_t &);
-template ValueBroker<uint32_t> SaveManager::get(const string &, const uint32_t &);
+template ValueBroker<uint32_t> SaveManager::get(const string &,
+												const uint32_t &);
 template ValueBroker<int32_t> SaveManager::get(const string &, const int32_t &);
-template ValueBroker<uint64_t> SaveManager::get(const string &, const uint64_t &);
+template ValueBroker<uint64_t> SaveManager::get(const string &,
+												const uint64_t &);
 template ValueBroker<int64_t> SaveManager::get(const string &, const int64_t &);
 template ValueBroker<float> SaveManager::get(const string &, const float &);
 template ValueBroker<double> SaveManager::get(const string &, const double &);
@@ -138,8 +156,8 @@ template <typename T>
 ValueBroker<T> SaveManager::get(const string & key) {
 	T value;
 	return {
-		[this, key] (const T & target) { this->set<T>(key, target); },
-		[this, key, value] () mutable -> const T & {
+		[this, key](const T & target) { this->set<T>(key, target); },
+		[this, key, value]() mutable -> const T & {
 			value = this->deserialize<T>(this->get_db().get(key));
 			return value;
 		},
@@ -156,4 +174,3 @@ template ValueBroker<int64_t> SaveManager::get(const string &);
 template ValueBroker<float> SaveManager::get(const string &);
 template ValueBroker<double> SaveManager::get(const string &);
 template ValueBroker<string> SaveManager::get(const string &);
-
diff --git a/src/crepe/api/SaveManager.h b/src/crepe/api/SaveManager.h
index 3073656..4be85fb 100644
--- a/src/crepe/api/SaveManager.h
+++ b/src/crepe/api/SaveManager.h
@@ -93,8 +93,8 @@ public:
 	static SaveManager & get_instance();
 	SaveManager(const SaveManager &) = delete;
 	SaveManager(SaveManager &&) = delete;
-	SaveManager & operator = (const SaveManager &) = delete;
-	SaveManager & operator = (SaveManager &&) = delete;
+	SaveManager & operator=(const SaveManager &) = delete;
+	SaveManager & operator=(SaveManager &&) = delete;
 
 private:
 	/**
@@ -110,5 +110,4 @@ private:
 	static DB & get_db();
 };
 
-}
-
+} // namespace crepe
diff --git a/src/crepe/api/Sprite.cpp b/src/crepe/api/Sprite.cpp
index d3465c7..6f0433f 100644
--- a/src/crepe/api/Sprite.cpp
+++ b/src/crepe/api/Sprite.cpp
@@ -1,7 +1,7 @@
-#include <cstdint>
 #include <memory>
 
 #include "../util/log.h"
+#include "facade/SDLContext.h"
 
 #include "Component.h"
 #include "Sprite.h"
@@ -10,10 +10,16 @@
 using namespace std;
 using namespace crepe;
 
-Sprite::Sprite(game_object_id_t id, shared_ptr<Texture> image,
+Sprite::Sprite(game_object_id_t id, const shared_ptr<Texture> image,
 			   const Color & color, const FlipSettings & flip)
-	: Component(id), color(color), flip(flip), sprite_image(image) {
+	: Component(id),
+	  color(color),
+	  flip(flip),
+	  sprite_image(image) {
 	dbg_trace();
+
+	this->sprite_rect.w = sprite_image->get_width();
+	this->sprite_rect.h = sprite_image->get_height();
 }
 
 Sprite::~Sprite() { dbg_trace(); }
diff --git a/src/crepe/api/Sprite.h b/src/crepe/api/Sprite.h
index 00dcb27..deb3f93 100644
--- a/src/crepe/api/Sprite.h
+++ b/src/crepe/api/Sprite.h
@@ -1,32 +1,88 @@
 #pragma once
 
-#include <SDL2/SDL_rect.h>
 #include <cstdint>
 #include <memory>
 
-#include "api/Color.h"
-#include "api/Texture.h"
-
+#include "Color.h"
 #include "Component.h"
+#include "Texture.h"
 
 namespace crepe {
 
+struct Rect {
+	int w = 0;
+	int h = 0;
+	int x = 0;
+	int y = 0;
+};
+
 struct FlipSettings {
-	bool flip_x = true;
-	bool flip_y = true;
+	bool flip_x = false;
+	bool flip_y = false;
 };
 
+class SDLContext;
+class Animator;
+class AnimatorSystem;
+
+/**
+ * \brief Represents a renderable sprite component.
+ *
+ * A renderable sprite that can be displayed in the game. It includes a texture,
+ * color, and flip settings, and is managed in layers with defined sorting orders.
+ */
 class Sprite : public Component {
 
 public:
-	Sprite(game_object_id_t id, std::shared_ptr<Texture> image,
+	// TODO: Loek comment in github #27 will be looked another time
+	// about shared_ptr Texture
+	/**
+	 * \brief Constructs a Sprite with specified parameters.
+	 * \param game_id Unique identifier for the game object this sprite belongs to.
+	 * \param image Shared pointer to the texture for this sprite.
+	 * \param color Color tint applied to the sprite.
+	 * \param flip Flip settings for horizontal and vertical orientation.
+	 */
+	Sprite(game_object_id_t id, const std::shared_ptr<Texture> image,
 		   const Color & color, const FlipSettings & flip);
+
+	/**
+	 * \brief Destroys the Sprite instance.
+	 */
 	~Sprite();
-	std::shared_ptr<Texture> sprite_image;
+
+	//! Texture used for the sprite
+	const std::shared_ptr<Texture> sprite_image;
+	//! Color tint of the sprite
 	Color color;
+	//! Flip settings for the sprite
 	FlipSettings flip;
-	uint8_t sorting_in_layer;
-	uint8_t order_in_layer;
+	//! Layer sorting level of the sprite
+	uint8_t sorting_in_layer = 0;
+	//! Order within the sorting layer
+	uint8_t order_in_layer = 0;
+
+public:
+	/**
+	 * \brief Gets the maximum number of instances allowed for this sprite.
+	 * \return Maximum instance count as an integer.
+	 *
+	 * For now is this number randomly picked. I think it will eventually be 1. 
+	 */
+	virtual int get_instances_max() const { return 10; }
+
+private:
+	//! Reads the sprite_rect of sprite
+	friend class SDLContext;
+
+	//! Reads the all the variables plus the  sprite_rect
+	friend class Animator;
+
+	//! Reads the all the variables plus the  sprite_rect
+	friend class AnimatorSystem;
+
+	//! Render area of the sprite this will also be adjusted by the AnimatorSystem if an Animator object is present in GameObject
+	Rect sprite_rect;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Texture.cpp b/src/crepe/api/Texture.cpp
index 8fc5c13..5ebd23d 100644
--- a/src/crepe/api/Texture.cpp
+++ b/src/crepe/api/Texture.cpp
@@ -21,12 +21,19 @@ Texture::Texture(const char * src) {
 
 Texture::~Texture() {
 	dbg_trace();
-	if (this->texture != nullptr) {
-		SDL_DestroyTexture(this->texture);
-	}
+	this->texture.reset();
 }
 
 void Texture::load(unique_ptr<Asset> res) {
 	SDLContext & ctx = SDLContext::get_instance();
-	this->texture = ctx.texture_from_path(res->canonical());
+	this->texture = std::move(ctx.texture_from_path(res->canonical()));
+}
+
+int Texture::get_width() const {
+	if (this->texture == nullptr) return 0;
+	return SDLContext::get_instance().get_width(*this);
+}
+int Texture::get_height() const {
+	if (this->texture == nullptr) return 0;
+	return SDLContext::get_instance().get_width(*this);
 }
diff --git a/src/crepe/api/Texture.h b/src/crepe/api/Texture.h
index 9a86f6f..b89bc17 100644
--- a/src/crepe/api/Texture.h
+++ b/src/crepe/api/Texture.h
@@ -3,31 +3,75 @@
 // FIXME: this header can't be included because this is an API header, and SDL2
 // development headers won't be bundled with crepe. Why is this facade in the
 // API namespace?
+
 #include <SDL2/SDL_render.h>
+#include <functional>
 #include <memory>
 
 #include "Asset.h"
 
 namespace crepe {
-class SDLContext;
-}
 
-namespace crepe {
+class SDLContext;
+class Animator;
 
+/**
+ * \class Texture
+ * \brief Manages texture loading and properties.
+ *
+ * The Texture class is responsible for loading an image from a source
+ * and providing access to its dimensions. Textures can be used for rendering.
+ */
 class Texture {
 
 public:
+	/**
+	 * \brief Constructs a Texture from a file path.
+	 * \param src Path to the image file to be loaded as a texture.
+	 */
 	Texture(const char * src);
+
+	/**
+	 * \brief Constructs a Texture from an Asset resource.
+	 * \param res Unique pointer to an Asset resource containing texture data.
+	 */
 	Texture(std::unique_ptr<Asset> res);
+
+	/**
+	 * \brief Destroys the Texture instance, freeing associated resources.
+	 */
 	~Texture();
+	// FIXME: this constructor shouldn't be necessary because this class doesn't
+	// manage memory
+
+	/**
+	 * \brief Gets the width of the texture.
+	 * \return Width of the texture in pixels.
+	 */
+	int get_width() const;
+
+	/**
+	 * \brief Gets the height of the texture.
+	 * \return Height of the texture in pixels.
+	 */
+	int get_height() const;
 
 private:
+	/**
+	 * \brief Loads the texture from an Asset resource.
+	 * \param res Unique pointer to an Asset resource to load the texture from.
+	 */
 	void load(std::unique_ptr<Asset> res);
 
 private:
-	SDL_Texture * texture = nullptr;
+	//! The texture of the class from the library
+	std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>> texture;
+
+	//! Grants SDLContext access to private members.
+	friend class SDLContext;
 
-	friend class crepe::SDLContext;
+	//! Grants Animator access to private members.
+	friend class Animator;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Transform.cpp b/src/crepe/api/Transform.cpp
index a244bc5..e401120 100644
--- a/src/crepe/api/Transform.cpp
+++ b/src/crepe/api/Transform.cpp
@@ -6,6 +6,9 @@ using namespace crepe;
 
 Transform::Transform(game_object_id_t id, const Vector2 & point,
 					 double rotation, double scale)
-	: Component(id), position(point), rotation(rotation), scale(scale) {
+	: Component(id),
+	  position(point),
+	  rotation(rotation),
+	  scale(scale) {
 	dbg_trace();
 }
diff --git a/src/crepe/api/Transform.h b/src/crepe/api/Transform.h
index d7a5b8a..756e45b 100644
--- a/src/crepe/api/Transform.h
+++ b/src/crepe/api/Transform.h
@@ -32,7 +32,7 @@ public:
 public:
 	//! Translation (shift)
 	Vector2 position;
-	//! Rotation, in radians
+	//! Rotation, in degrees
 	double rotation;
 	//! Multiplication factor
 	double scale;
diff --git a/src/crepe/api/Vector2.cpp b/src/crepe/api/Vector2.cpp
index 09bb59b..09b3fa3 100644
--- a/src/crepe/api/Vector2.cpp
+++ b/src/crepe/api/Vector2.cpp
@@ -3,7 +3,7 @@
 namespace crepe {
 
 // Constructor with initial values
-Vector2::Vector2(float x, float y) : x(x), y(y) {}
+Vector2::Vector2(double x, double y) : x(x), y(y) {}
 
 // Subtracts another vector from this vector and returns the result.
 Vector2 Vector2::operator-(const Vector2 & other) const {
@@ -16,7 +16,7 @@ Vector2 Vector2::operator+(const Vector2 & other) const {
 }
 
 // Multiplies this vector by a scalar and returns the result.
-Vector2 Vector2::operator*(float scalar) const {
+Vector2 Vector2::operator*(double scalar) const {
 	return {x * scalar, y * scalar};
 }
 
@@ -35,7 +35,7 @@ Vector2 & Vector2::operator+=(const Vector2 & other) {
 }
 
 // Adds a scalar value to both components of this vector and updates this vector.
-Vector2 & Vector2::operator+=(float other) {
+Vector2 & Vector2::operator+=(double other) {
 	x += other;
 	y += other;
 	return *this;
diff --git a/src/crepe/api/Vector2.h b/src/crepe/api/Vector2.h
index 741951b..5a57484 100644
--- a/src/crepe/api/Vector2.h
+++ b/src/crepe/api/Vector2.h
@@ -6,15 +6,15 @@ namespace crepe {
 class Vector2 {
 public:
 	//! X component of the vector
-	float x;
+	double x;
 	//! Y component of the vector
-	float y;
+	double y;
 
 	//! Default constructor
 	Vector2() = default;
 
 	//! Constructor with initial values
-	Vector2(float x, float y);
+	Vector2(double x, double y);
 
 	//! Subtracts another vector from this vector and returns the result.
 	Vector2 operator-(const Vector2 & other) const;
@@ -23,7 +23,7 @@ public:
 	Vector2 operator+(const Vector2 & other) const;
 
 	//! Multiplies this vector by a scalar and returns the result.
-	Vector2 operator*(float scalar) const;
+	Vector2 operator*(double scalar) const;
 
 	//! Multiplies this vector by another vector element-wise and updates this vector.
 	Vector2 & operator*=(const Vector2 & other);
@@ -32,7 +32,7 @@ public:
 	Vector2 & operator+=(const Vector2 & other);
 
 	//! Adds a scalar value to both components of this vector and updates this vector.
-	Vector2 & operator+=(float other);
+	Vector2 & operator+=(double other);
 
 	//! Returns the negation of this vector.
 	Vector2 operator-() const;
diff --git a/src/crepe/facade/DB.cpp b/src/crepe/facade/DB.cpp
index c885560..0a2f455 100644
--- a/src/crepe/facade/DB.cpp
+++ b/src/crepe/facade/DB.cpp
@@ -1,7 +1,7 @@
 #include <cstring>
 
-#include "util/log.h"
 #include "Exception.h"
+#include "util/log.h"
 
 #include "DB.h"
 
@@ -16,20 +16,21 @@ DB::DB(const string & path) {
 	libdb::DB * db;
 	if ((ret = libdb::db_create(&db, NULL, 0)) != 0)
 		throw Exception("db_create: %s", libdb::db_strerror(ret));
-	this->db = { db, [] (libdb::DB * db) { db->close(db, 0); } };
+	this->db = {db, [](libdb::DB * db) { db->close(db, 0); }};
 
 	// load or create database file
-	if ((ret = this->db->open(this->db.get(), NULL, path.c_str(), NULL, libdb::DB_BTREE, DB_CREATE, 0)) != 0)
+	if ((ret = this->db->open(this->db.get(), NULL, path.c_str(), NULL,
+							  libdb::DB_BTREE, DB_CREATE, 0))
+		!= 0)
 		throw Exception("db->open: %s", libdb::db_strerror(ret));
 
 	// create cursor
 	libdb::DBC * cursor;
 	if ((ret = this->db->cursor(this->db.get(), NULL, &cursor, 0)) != 0)
 		throw Exception("db->cursor: %s", libdb::db_strerror(ret));
-	this->cursor = { cursor, [] (libdb::DBC * cursor) { cursor->close(cursor); } };
+	this->cursor = {cursor, [](libdb::DBC * cursor) { cursor->close(cursor); }};
 }
 
-
 libdb::DBT DB::to_thing(const string & thing) const noexcept {
 	libdb::DBT thang;
 	memset(&thang, 0, sizeof(libdb::DBT));
@@ -44,17 +45,15 @@ string DB::get(const string & key) {
 	memset(&db_val, 0, sizeof(libdb::DBT));
 
 	int ret = this->cursor->get(this->cursor.get(), &db_key, &db_val, DB_FIRST);
-	if (ret != 0)
-		throw Exception("cursor->get: %s", libdb::db_strerror(ret));
-	return { static_cast<char *>(db_val.data), db_val.size };
+	if (ret != 0) throw Exception("cursor->get: %s", libdb::db_strerror(ret));
+	return {static_cast<char *>(db_val.data), db_val.size};
 }
 
 void DB::set(const string & key, const string & value) {
 	libdb::DBT db_key = this->to_thing(key);
 	libdb::DBT db_val = this->to_thing(value);
 	int ret = this->db->put(this->db.get(), NULL, &db_key, &db_val, 0);
-	if (ret != 0)
-		throw Exception("cursor->get: %s", libdb::db_strerror(ret));
+	if (ret != 0) throw Exception("cursor->get: %s", libdb::db_strerror(ret));
 }
 
 bool DB::has(const std::string & key) noexcept {
@@ -65,4 +64,3 @@ bool DB::has(const std::string & key) noexcept {
 	}
 	return true;
 }
-
diff --git a/src/crepe/facade/DB.h b/src/crepe/facade/DB.h
index b62a974..7c757a2 100644
--- a/src/crepe/facade/DB.h
+++ b/src/crepe/facade/DB.h
@@ -1,14 +1,14 @@
 #pragma once
 
-#include <string>
 #include <functional>
 #include <memory>
+#include <string>
 
 namespace libdb {
 extern "C" {
 #include <db.h>
 }
-}
+} // namespace libdb
 
 namespace crepe {
 
@@ -71,5 +71,4 @@ private:
 	libdb::DBT to_thing(const std::string & thing) const noexcept;
 };
 
-}
-
+} // namespace crepe
diff --git a/src/crepe/facade/SDLContext.cpp b/src/crepe/facade/SDLContext.cpp
index 8da93e9..236bf8c 100644
--- a/src/crepe/facade/SDLContext.cpp
+++ b/src/crepe/facade/SDLContext.cpp
@@ -1,16 +1,22 @@
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_image.h>
+#include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_surface.h>
 #include <SDL2/SDL_video.h>
 #include <cmath>
 #include <cstddef>
+#include <functional>
 #include <iostream>
+#include <memory>
+#include <string>
+#include <utility>
 
 #include "../api/Sprite.h"
 #include "../api/Texture.h"
 #include "../api/Transform.h"
 #include "../util/log.h"
+#include "Exception.h"
 
 #include "SDLContext.h"
 
@@ -21,34 +27,6 @@ SDLContext & SDLContext::get_instance() {
 	return instance;
 }
 
-void SDLContext::handle_events(bool & running) {
-	SDL_Event event;
-	while (SDL_PollEvent(&event)) {
-		if (event.type == SDL_QUIT) {
-			running = false;
-		}
-	}
-}
-
-SDLContext::~SDLContext() {
-	dbg_trace();
-
-	if (this->game_renderer != nullptr)
-		SDL_DestroyRenderer(this->game_renderer);
-
-	if (this->game_window != nullptr) {
-		SDL_DestroyWindow(this->game_window);
-	}
-
-	// TODO: how are we going to ensure that these are called from the same
-	// thread that SDL_Init() was called on? This has caused problems for me
-	// before.
-	IMG_Quit();
-	SDL_Quit();
-}
-
-void SDLContext::clear_screen() { SDL_RenderClear(this->game_renderer); }
-
 SDLContext::SDLContext() {
 	dbg_trace();
 	// FIXME: read window defaults from config manager
@@ -59,26 +37,32 @@ SDLContext::SDLContext() {
 				  << std::endl;
 		return;
 	}
-
-	this->game_window = SDL_CreateWindow(
+	SDL_Window * tmp_window = SDL_CreateWindow(
 		"Crepe Game Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-		1920, 1080, SDL_WINDOW_SHOWN);
-	if (!this->game_window) {
+		this->viewport.w, this->viewport.h, 0);
+	if (!tmp_window) {
 		// FIXME: throw exception
 		std::cerr << "Window could not be created! SDL_Error: "
 				  << SDL_GetError() << std::endl;
+		return;
 	}
+	this->game_window
+		= {tmp_window, [](SDL_Window * window) { SDL_DestroyWindow(window); }};
 
-	this->game_renderer
-		= SDL_CreateRenderer(this->game_window, -1, SDL_RENDERER_ACCELERATED);
-	if (!this->game_renderer) {
+	SDL_Renderer * tmp_renderer = SDL_CreateRenderer(
+		this->game_window.get(), -1, SDL_RENDERER_ACCELERATED);
+	if (!tmp_renderer) {
 		// FIXME: throw exception
 		std::cerr << "Renderer could not be created! SDL_Error: "
 				  << SDL_GetError() << std::endl;
-		SDL_DestroyWindow(this->game_window);
+		SDL_DestroyWindow(this->game_window.get());
 		return;
 	}
 
+	this->game_renderer = {tmp_renderer, [](SDL_Renderer * renderer) {
+							   SDL_DestroyRenderer(renderer);
+						   }};
+
 	int img_flags = IMG_INIT_PNG;
 	if (!(IMG_Init(img_flags) & img_flags)) {
 		// FIXME: throw exception
@@ -87,71 +71,124 @@ SDLContext::SDLContext() {
 	}
 }
 
-void SDLContext::present_screen() { SDL_RenderPresent(this->game_renderer); }
+SDLContext::~SDLContext() {
+	dbg_trace();
 
-void SDLContext::draw(const Sprite & sprite, const Transform & transform) {
+	this->game_renderer.reset();
+	this->game_window.reset();
 
-	static SDL_RendererFlip render_flip
+	// TODO: how are we going to ensure that these are called from the same
+	// thread that SDL_Init() was called on? This has caused problems for me
+	// before.
+	IMG_Quit();
+	SDL_Quit();
+}
+
+void SDLContext::handle_events(bool & running) {
+	//TODO: wouter i need events
+	/*
+	SDL_Event event;
+	SDL_PollEvent(&event);
+	switch (event.type) {
+		case SDL_QUIT:
+			running = false;
+			break;
+		case SDL_KEYDOWN:
+			triggerEvent(KeyPressedEvent(getCustomKey(event.key.keysym.sym)));
+			break;
+		case SDL_MOUSEBUTTONDOWN:
+			int x, y;
+			SDL_GetMouseState(&x, &y);
+			triggerEvent(MousePressedEvent(x, y));
+			break;
+	}
+	*/
+}
+
+void SDLContext::clear_screen() { SDL_RenderClear(this->game_renderer.get()); }
+void SDLContext::present_screen() {
+	SDL_RenderPresent(this->game_renderer.get());
+}
+
+void SDLContext::draw(const Sprite & sprite, const Transform & transform,
+					  const Camera & cam) {
+
+	SDL_RendererFlip render_flip
 		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
 							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
 
-	int w, h;
-	SDL_QueryTexture(sprite.sprite_image->texture, NULL, NULL, &w, &h);
-	// needs maybe camera for position
+	double adjusted_x = (transform.position.x - cam.x) * cam.zoom;
+	double adjusted_y = (transform.position.y - cam.y) * cam.zoom;
+	double adjusted_w = sprite.sprite_rect.w * transform.scale * cam.zoom;
+	double adjusted_h = sprite.sprite_rect.h * transform.scale * cam.zoom;
+
+	SDL_Rect srcrect = {
+		.x = sprite.sprite_rect.x,
+		.y = sprite.sprite_rect.y,
+		.w = sprite.sprite_rect.w,
+		.h = sprite.sprite_rect.h,
+	};
+
 	SDL_Rect dstrect = {
-		.x = static_cast<int>(transform.position.x),
-		.y = static_cast<int>(transform.position.y),
-		.w = static_cast<int>(w * transform.scale),
-		.h = static_cast<int>(h * transform.scale),
+		.x = static_cast<int>(adjusted_x),
+		.y = static_cast<int>(adjusted_y),
+		.w = static_cast<int>(adjusted_w),
+		.h = static_cast<int>(adjusted_h),
 	};
 
-	double degrees = transform.rotation * 180 / M_PI;
-	SDL_RenderCopyEx(this->game_renderer, sprite.sprite_image->texture, NULL,
-					 &dstrect, degrees, NULL, render_flip);
+	SDL_RenderCopyEx(this->game_renderer.get(),
+					 sprite.sprite_image->texture.get(), &srcrect,
+
+					 &dstrect, transform.rotation, NULL, render_flip);
 }
 
-/*
-SDL_Texture * SDLContext::setTextureFromPath(const char * path, SDL_Rect & clip,
-											 const int row, const int col) {
-	dbg_trace();
+void SDLContext::camera(const Camera & cam) {
+	this->viewport.w = static_cast<int>(cam.aspect_width);
+	this->viewport.h = static_cast<int>(cam.aspect_height);
+	this->viewport.x = static_cast<int>(cam.x) - (SCREEN_WIDTH / 2);
+	this->viewport.y = static_cast<int>(cam.y) - (SCREEN_HEIGHT / 2);
 
-	SDL_Surface * tmp = IMG_Load(path);
-	if (!tmp) {
-		std::cerr << "Error surface " << IMG_GetError << std::endl;
-	}
+	SDL_SetRenderDrawColor(this->game_renderer.get(), cam.bg_color.r,
+						   cam.bg_color.g, cam.bg_color.b, cam.bg_color.a);
+}
 
-	clip.
-		w = tmp->w / col;
-	clip.h = tmp->h / row;
+uint64_t SDLContext::get_ticks() const { return SDL_GetTicks64(); }
 
-	SDL_Texture * CreatedTexture
-		= SDL_CreateTextureFromSurface(this->game_renderer, tmp);
+std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>>
+SDLContext::texture_from_path(const std::string & path) {
 
-	if (!CreatedTexture) {
-		std::cerr << "Error could not create texture " << IMG_GetError
-				  << std::endl;
+	SDL_Surface * tmp = IMG_Load(path.c_str());
+	if (tmp == nullptr) {
+		tmp = IMG_Load("../asset/texture/ERROR.png");
 	}
-	SDL_FreeSurface(tmp);
 
-	return CreatedTexture;
-}
-*/
+	std::unique_ptr<SDL_Surface, std::function<void(SDL_Surface *)>>
+		img_surface;
+	img_surface
+		= {tmp, [](SDL_Surface * surface) { SDL_FreeSurface(surface); }};
 
-SDL_Texture * SDLContext::texture_from_path(const char * path) {
-	dbg_trace();
+	SDL_Texture * tmp_texture = SDL_CreateTextureFromSurface(
+		this->game_renderer.get(), img_surface.get());
 
-	SDL_Surface * tmp = IMG_Load(path);
-	if (!tmp) {
-		std::cerr << "Error surface " << IMG_GetError << std::endl;
+	if (tmp_texture == nullptr) {
+		throw Exception("Texture cannot be load from %s", path.c_str());
 	}
-	SDL_Texture * created_texture
-		= SDL_CreateTextureFromSurface(this->game_renderer, tmp);
 
-	if (!created_texture) {
-		std::cerr << "Error could not create texture " << IMG_GetError
-				  << std::endl;
-	}
-	SDL_FreeSurface(tmp);
+	std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>>
+		img_texture;
+	img_texture = {tmp_texture,
+				   [](SDL_Texture * texture) { SDL_DestroyTexture(texture); }};
 
-	return created_texture;
+	return img_texture;
+}
+int SDLContext::get_width(const Texture & ctx) const {
+	int w;
+	SDL_QueryTexture(ctx.texture.get(), NULL, NULL, &w, NULL);
+	return w;
+}
+int SDLContext::get_height(const Texture & ctx) const {
+	int h;
+	SDL_QueryTexture(ctx.texture.get(), NULL, NULL, NULL, &h);
+	return h;
 }
+void SDLContext::delay(int ms) const { SDL_Delay(ms); }
diff --git a/src/crepe/facade/SDLContext.h b/src/crepe/facade/SDLContext.h
index f1ba8a6..536dec5 100644
--- a/src/crepe/facade/SDLContext.h
+++ b/src/crepe/facade/SDLContext.h
@@ -1,48 +1,157 @@
 #pragma once
 
+#include <SDL2/SDL_keycode.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_video.h>
+#include <functional>
+#include <memory>
+#include <string>
 
 #include "../api/Sprite.h"
 #include "../api/Transform.h"
-#include "../system/RenderSystem.h"
+#include "api/Camera.h"
+
+// FIXME: this needs to be removed
+const int SCREEN_WIDTH = 640;
+const int SCREEN_HEIGHT = 480;
 
 namespace crepe {
 
+// TODO: SDL_Keycode is defined in a header not distributed with crepe, which
+// means this typedef is unusable when crepe is packaged. Wouter will fix this
+// later.
+typedef SDL_Keycode CREPE_KEYCODES;
+
 class Texture;
+class LoopManager;
+
+/**
+ * \class SDLContext
+ * \brief Facade for the SDL library
+ * 
+ * SDLContext is a singleton that handles the SDL window and renderer, provides methods
+ * for event handling, and rendering to the screen. It is never used directly by the user
+ */
 class SDLContext {
 
 public:
-	// singleton
+	/**
+	 * \brief Gets the singleton instance of SDLContext.
+	 * \return Reference to the SDLContext instance.
+	 */
 	static SDLContext & get_instance();
+
 	SDLContext(const SDLContext &) = delete;
 	SDLContext(SDLContext &&) = delete;
 	SDLContext & operator=(const SDLContext &) = delete;
 	SDLContext & operator=(SDLContext &&) = delete;
 
-	//TODO decide events wouter?
-
 private:
+	//! will only use handle_events
+	friend class LoopManager;
+	/**
+	 * \brief Handles SDL events such as window close and input.
+	 * \param running Reference to a boolean flag that controls the main loop.
+	 */
 	void handle_events(bool & running);
 
 private:
+	//! Will only use get_ticks
+	friend class AnimatorSystem;
+	//! Will only use delay
+	friend class LoopTimer;
+	/**
+	 * \brief Gets the current SDL ticks since the program started.
+	 * \return Current ticks in milliseconds as a constant uint64_t.
+	 */
+	uint64_t get_ticks() const;
+	/**
+	 * \brief Pauses the execution for a specified duration.
+	 *
+	 * This function uses SDL's delay function to halt the program execution
+	 * for a given number of milliseconds, allowing for frame rate control
+	 * or other timing-related functionality.
+	 *
+	 * \param ms Duration of the delay in milliseconds.
+	 */
+	void delay(int ms) const;
+
+private:
+	/**
+	 * \brief Constructs an SDLContext instance.
+	 * Initializes SDL, creates a window and renderer.
+	 */
 	SDLContext();
-	virtual ~SDLContext();
+
+	/**
+	 * \brief Destroys the SDLContext instance.
+	 * Cleans up SDL resources, including the window and renderer.
+	 */
+	~SDLContext();
 
 private:
+	//! Will use the funtions: texture_from_path, get_width,get_height.
 	friend class Texture;
-	SDL_Texture * texture_from_path(const char *);
-	//SDL_Texture* setTextureFromPath(const char*, SDL_Rect& clip, const int row, const int col);
+
+	//! Will use the funtions: texture_from_path, get_width,get_height.
+	friend class Animator;
+
+	/**
+	 * \brief Loads a texture from a file path.
+	 * \param path Path to the image file.
+	 * \return Pointer to the created SDL_Texture.
+	 */
+	std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>>
+	texture_from_path(const std::string & path);
+	/**
+	 * \brief Gets the width of a texture.
+	 * \param texture Reference to the Texture object.
+	 * \return Width of the texture as an integer.
+	 */
+	int get_width(const Texture &) const;
+
+	/**
+	 * \brief Gets the height of a texture.
+	 * \param texture Reference to the Texture object.
+	 * \return Height of the texture as an integer.
+	 */
+	int get_height(const Texture &) const;
 
 private:
+	//! Will use draw,clear_screen, present_screen, camera.
 	friend class RenderSystem;
-	void draw(const Sprite &, const Transform &);
+
+	/**
+	 * \brief Draws a sprite to the screen using the specified transform and camera.
+	 * \param sprite Reference to the Sprite to draw.
+	 * \param transform Reference to the Transform for positioning.
+	 * \param camera Reference to the Camera for view adjustments.
+	 */
+	void draw(const Sprite & sprite, const Transform & transform,
+			  const Camera & camera);
+
+	//! Clears the screen, preparing for a new frame.
 	void clear_screen();
+
+	//! Presents the rendered frame to the screen.
 	void present_screen();
 
+	/**
+	 * \brief Sets the current camera for rendering.
+	 * \param camera Reference to the Camera object.
+	 */
+	void camera(const Camera & camera);
+
 private:
-	SDL_Window * game_window = nullptr;
-	SDL_Renderer * game_renderer = nullptr;
+	//! sdl Window
+	std::unique_ptr<SDL_Window, std::function<void(SDL_Window *)>> game_window;
+
+	//! renderer for the crepe engine
+	std::unique_ptr<SDL_Renderer, std::function<void(SDL_Renderer *)>>
+		game_renderer;
+
+	//! viewport for the camera window
+	SDL_Rect viewport = {0, 0, 640, 480};
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/AnimatorSystem.cpp b/src/crepe/system/AnimatorSystem.cpp
new file mode 100644
index 0000000..bf45362
--- /dev/null
+++ b/src/crepe/system/AnimatorSystem.cpp
@@ -0,0 +1,37 @@
+
+#include <cstdint>
+#include <functional>
+#include <vector>
+
+#include "api/Animator.h"
+#include "facade/SDLContext.h"
+#include "util/log.h"
+
+#include "AnimatorSystem.h"
+#include "ComponentManager.h"
+
+using namespace crepe;
+
+AnimatorSystem::AnimatorSystem() { dbg_trace(); }
+AnimatorSystem::~AnimatorSystem() { dbg_trace(); }
+
+AnimatorSystem & AnimatorSystem::get_instance() {
+	static AnimatorSystem instance;
+	return instance;
+}
+
+void AnimatorSystem::update() {
+	ComponentManager & mgr = ComponentManager::get_instance();
+
+	std::vector<std::reference_wrapper<Animator>> animations
+		= mgr.get_components_by_type<Animator>();
+
+	uint64_t tick = SDLContext::get_instance().get_ticks();
+	for (Animator & a : animations) {
+		if (a.active) {
+			a.curr_row = (tick / 100) % a.row;
+			a.animator_rect.x = (a.curr_row * a.animator_rect.w) + a.curr_col;
+			a.spritesheet.sprite_rect = a.animator_rect;
+		}
+	}
+}
diff --git a/src/crepe/system/AnimatorSystem.h b/src/crepe/system/AnimatorSystem.h
new file mode 100644
index 0000000..969e9d1
--- /dev/null
+++ b/src/crepe/system/AnimatorSystem.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "System.h"
+
+//TODO:
+// control if flip works with animation system
+
+namespace crepe {
+
+/**
+ * \brief The AnimatorSystem is responsible for managing and updating all Animator components.
+ *
+ * This system is responsible for controlling the behavior of the animations for all entities
+ * that have the Animator component attached. It updates the animations by controlling their
+ * frame changes, looping behavior, and overall animation state.
+ */
+class AnimatorSystem : public System {
+
+public:
+	/**
+	 * \brief Retrieves the singleton instance of the AnimatorSystem.
+	 *
+	 * \return A reference to the single instance of the AnimatorSystem.
+	 *
+	 * This method ensures that there is only one instance of the AnimatorSystem, following the
+	 * singleton design pattern. It can be used to access the system globally.
+	 */
+	static AnimatorSystem & get_instance();
+
+	/**
+	 * \brief Updates the Animator components.
+	 *
+	 * This method is called periodically (likely every frame) to update the state of all
+	 * Animator components, moving the animations forward and managing their behavior (e.g., looping).
+	 */
+	void update() override;
+
+private:
+	// private because singleton
+	AnimatorSystem(); // dbg_trace
+	~AnimatorSystem(); // dbg_trace
+};
+
+} // namespace crepe
diff --git a/src/crepe/system/AudioSystem.cpp b/src/crepe/system/AudioSystem.cpp
index 93c0955..9fdd7eb 100644
--- a/src/crepe/system/AudioSystem.cpp
+++ b/src/crepe/system/AudioSystem.cpp
@@ -1,5 +1,3 @@
-#pragma once
-
 #include "AudioSystem.h"
 #include "ComponentManager.h"
 
diff --git a/src/crepe/system/AudioSystem.h b/src/crepe/system/AudioSystem.h
index 8fb681f..e037f51 100644
--- a/src/crepe/system/AudioSystem.h
+++ b/src/crepe/system/AudioSystem.h
@@ -8,13 +8,11 @@ namespace crepe {
 
 class AudioSystem : public System {
 public:
-	AudioSystem(SoundContext & ctx);
-
-public:
-	void update();
+	using System::System;
+	void update() override;
 
 private:
-	SoundContext & ctx;
+	SoundContext context {};
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/CMakeLists.txt b/src/crepe/system/CMakeLists.txt
index ca62add..f507b90 100644
--- a/src/crepe/system/CMakeLists.txt
+++ b/src/crepe/system/CMakeLists.txt
@@ -6,6 +6,7 @@ target_sources(crepe PUBLIC
 	CollisionSystem.cpp
 	RenderSystem.cpp
 	AudioSystem.cpp
+	AnimatorSystem.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -15,4 +16,5 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	CollisionSystem.h
 	RenderSystem.h
 	AudioSystem.h
+	AnimatorSystem.h
 )
diff --git a/src/crepe/system/ParticleSystem.cpp b/src/crepe/system/ParticleSystem.cpp
index 397b586..e7a3bec 100644
--- a/src/crepe/system/ParticleSystem.cpp
+++ b/src/crepe/system/ParticleSystem.cpp
@@ -1,62 +1,141 @@
 #include <cmath>
+#include <cstdlib>
 #include <ctime>
 
-#include "../ComponentManager.h"
-#include "../api/ParticleEmitter.h"
+#include "api/ParticleEmitter.h"
+#include "api/Transform.h"
+#include "api/Vector2.h"
 
+#include "ComponentManager.h"
 #include "ParticleSystem.h"
 
 using namespace crepe;
 
-ParticleSystem::ParticleSystem() : elapsed_time(0.0f) {}
-
 void ParticleSystem::update() {
+	// Get all emitters
 	ComponentManager & mgr = ComponentManager::get_instance();
 	std::vector<std::reference_wrapper<ParticleEmitter>> emitters
 		= mgr.get_components_by_type<ParticleEmitter>();
-	float delta_time = 0.10;
+
 	for (ParticleEmitter & emitter : emitters) {
-		float update_amount = 1 / static_cast<float>(emitter.emission_rate);
-		for (float i = 0; i < delta_time; i += update_amount) {
-			emit_particle(emitter);
+		// Get transform linked to emitter
+		const Transform & transform
+			= mgr.get_components_by_id<Transform>(emitter.game_object_id)
+				  .front()
+				  .get();
+
+		// Emit particles based on emission_rate
+		int updates
+			= calculate_update(this->update_count, emitter.data.emission_rate);
+		for (size_t i = 0; i < updates; i++) {
+			emit_particle(emitter, transform);
 		}
-		for (size_t j = 0; j < emitter.particles.size(); j++) {
-			if (emitter.particles[j].active) {
-				emitter.particles[j].update(delta_time);
+
+		// Update all particles
+		for (Particle & particle : emitter.data.particles) {
+			if (particle.active) {
+				particle.update();
 			}
 		}
+
+		// Check if within boundary
+		check_bounds(emitter, transform);
 	}
+
+	this->update_count = (this->update_count + 1) % this->MAX_UPDATE_COUNT;
 }
 
-void ParticleSystem::emit_particle(ParticleEmitter & emitter) {
-	Position initial_position = {emitter.position.x, emitter.position.y};
-	float random_angle = 0.0f;
-	if (emitter.max_angle < emitter.min_angle) {
-		random_angle = ((emitter.min_angle
-						 + (std::rand()
-							% (static_cast<uint32_t>(emitter.max_angle + 360
-													 - emitter.min_angle + 1))))
-						% 360);
-	} else {
-		random_angle = emitter.min_angle
-					   + (std::rand()
-						  % (static_cast<uint32_t>(emitter.max_angle
-												   - emitter.min_angle + 1)));
-	}
-	float angle_in_radians = random_angle * (M_PI / 180.0f);
-	float random_speed_offset = (static_cast<float>(std::rand()) / RAND_MAX)
-									* (2 * emitter.speed_offset)
-								- emitter.speed_offset;
-	float velocity_x
-		= (emitter.speed + random_speed_offset) * std::cos(angle_in_radians);
-	float velocity_y
-		= (emitter.speed + random_speed_offset) * std::sin(angle_in_radians);
-	Position initial_velocity = {velocity_x, velocity_y};
-	for (size_t i = 0; i < emitter.particles.size(); i++) {
-		if (!emitter.particles[i].active) {
-			emitter.particles[i].reset(emitter.end_lifespan, initial_position,
-									   initial_velocity);
+void ParticleSystem::emit_particle(ParticleEmitter & emitter,
+								   const Transform & transform) {
+	constexpr double DEG_TO_RAD = M_PI / 180.0;
+
+	Vector2 initial_position = emitter.data.position + transform.position;
+	double random_angle
+		= generate_random_angle(emitter.data.min_angle, emitter.data.max_angle);
+
+	double random_speed
+		= generate_random_speed(emitter.data.min_speed, emitter.data.max_speed);
+	double angle_radians = random_angle * DEG_TO_RAD;
+
+	Vector2 velocity = {random_speed * std::cos(angle_radians),
+						random_speed * std::sin(angle_radians)};
+
+	for (Particle & particle : emitter.data.particles) {
+		if (!particle.active) {
+			particle.reset(emitter.data.end_lifespan, initial_position,
+						   velocity, random_angle);
 			break;
 		}
 	}
 }
+
+int ParticleSystem::calculate_update(int count, double emission) const {
+	double integer_part = std::floor(emission);
+	double fractional_part = emission - integer_part;
+
+	if (fractional_part > 0) {
+		int denominator = static_cast<int>(1.0 / fractional_part);
+		return (count % denominator == 0) ? 1 : 0;
+	}
+
+	return static_cast<int>(emission);
+}
+
+void ParticleSystem::check_bounds(ParticleEmitter & emitter,
+								  const Transform & transform) {
+	Vector2 offset = emitter.data.boundary.offset + transform.position
+					 + emitter.data.position;
+	double half_width = emitter.data.boundary.width / 2.0;
+	double half_height = emitter.data.boundary.height / 2.0;
+
+	const double LEFT = offset.x - half_width;
+	const double RIGHT = offset.x + half_width;
+	const double TOP = offset.y - half_height;
+	const double BOTTOM = offset.y + half_height;
+
+	for (Particle & particle : emitter.data.particles) {
+		const Vector2 & position = particle.position;
+		bool within_bounds = (position.x >= LEFT && position.x <= RIGHT
+							  && position.y >= TOP && position.y <= BOTTOM);
+
+		if (!within_bounds) {
+			if (emitter.data.boundary.reset_on_exit) {
+				particle.active = false;
+			} else {
+				particle.velocity = {0, 0};
+				if (position.x < LEFT) particle.position.x = LEFT;
+				else if (position.x > RIGHT) particle.position.x = RIGHT;
+				if (position.y < TOP) particle.position.y = TOP;
+				else if (position.y > BOTTOM) particle.position.y = BOTTOM;
+			}
+		}
+	}
+}
+
+double ParticleSystem::generate_random_angle(double min_angle,
+											 double max_angle) const {
+	if (min_angle == max_angle) {
+		return min_angle;
+	} else if (min_angle < max_angle) {
+		return min_angle
+			   + static_cast<double>(std::rand()
+									 % static_cast<int>(max_angle - min_angle));
+	} else {
+		double angle_offset = (360 - min_angle) + max_angle;
+		double random_angle = min_angle
+							  + static_cast<double>(
+								  std::rand() % static_cast<int>(angle_offset));
+		return (random_angle >= 360) ? random_angle - 360 : random_angle;
+	}
+}
+
+double ParticleSystem::generate_random_speed(double min_speed,
+											 double max_speed) const {
+	if (min_speed == max_speed) {
+		return min_speed;
+	} else {
+		return min_speed
+			   + static_cast<double>(std::rand()
+									 % static_cast<int>(max_speed - min_speed));
+	}
+}
diff --git a/src/crepe/system/ParticleSystem.h b/src/crepe/system/ParticleSystem.h
index 3ac1d3f..d7ca148 100644
--- a/src/crepe/system/ParticleSystem.h
+++ b/src/crepe/system/ParticleSystem.h
@@ -1,18 +1,71 @@
 #pragma once
 
-#include "../api/ParticleEmitter.h"
+#include <cstdint>
 
-namespace crepe {
+#include "System.h"
 
-class ParticleSystem {
+namespace crepe {
+class ParticleEmitter;
+class Transform;
+/**
+ 	* \brief ParticleSystem class responsible for managing particle emission, updates, and bounds checking.
+ 	*/
+class ParticleSystem : public System {
 public:
-	ParticleSystem();
-	void update();
+	/**
+		* \brief Updates all particle emitters by emitting particles, updating particle states, and checking bounds.
+		*/
+	void update() override;
 
 private:
-	void emit_particle(ParticleEmitter & emitter); //emits a new particle
+	/**
+		* \brief Emits a particle from the specified emitter based on its emission properties.
+		* 
+		* \param emitter Reference to the ParticleEmitter.
+		* \param transform Const reference to the Transform component associated with the emitter.
+		*/
+	void emit_particle(ParticleEmitter & emitter, const Transform & transform);
+
+	/**
+		* \brief Calculates the number of times particles should be emitted based on emission rate and update count.
+		* 
+		* \param count Current update count.
+		* \param emission Emission rate.
+		* \return The number of particles to emit.
+		*/
+	int calculate_update(int count, double emission) const;
+
+	/**
+		* \brief Checks whether particles are within the emitter’s boundary, resets or stops particles if they exit.
+		* 
+		* \param emitter Reference to the ParticleEmitter.
+		* \param transform Const reference to the Transform component associated with the emitter.
+		*/
+	void check_bounds(ParticleEmitter & emitter, const Transform & transform);
 
-	float elapsed_time; //elapsed time since the last emission
+	/**
+		* \brief Generates a random angle for particle emission within the specified range.
+		* 
+		* \param min_angle Minimum emission angle in degrees.
+		* \param max_angle Maximum emission angle in degrees.
+		* \return Random angle in degrees.
+		*/
+	double generate_random_angle(double min_angle, double max_angle) const;
+
+	/**
+		* \brief Generates a random speed for particle emission within the specified range.
+		* 
+		* \param min_speed Minimum emission speed.
+		* \param max_speed Maximum emission speed.
+		* \return Random speed.
+		*/
+	double generate_random_speed(double min_speed, double max_speed) const;
+
+private:
+	//! Counter to count updates to determine how many times emit_particle is called.
+	unsigned int update_count = 0;
+	//! Determines the lowest amount of emission rate (1000 = 0.001 = 1 particle per 1000 updates).
+	static constexpr unsigned int MAX_UPDATE_COUNT = 100;
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/PhysicsSystem.h b/src/crepe/system/PhysicsSystem.h
index cc13b70..038c120 100644
--- a/src/crepe/system/PhysicsSystem.h
+++ b/src/crepe/system/PhysicsSystem.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "System.h"
+
 namespace crepe {
 /**
  * \brief System that controls all physics
@@ -7,18 +9,14 @@ namespace crepe {
  * This class is a physics system that uses a rigidbody and transform
  * to add physics to a game object.
  */
-class PhysicsSystem {
+class PhysicsSystem : public System {
 public:
 	/**
-	 * Constructor is default
-	 */
-	PhysicsSystem() = default;
-	/**
 	 * \brief updates the physics system.
 	 * 
 	 * It calculates new velocties and changes the postion in the transform.
 	 */
-	void update();
+	void update() override;
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index 5a07cc2..10211a3 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -20,7 +20,25 @@ RenderSystem & RenderSystem::get_instance() {
 	return instance;
 }
 
-void RenderSystem::update() {
+void RenderSystem::clear_screen() const {
+	SDLContext::get_instance().clear_screen();
+}
+
+void RenderSystem::present_screen() const {
+	SDLContext::get_instance().present_screen();
+}
+void RenderSystem::update_camera() {
+	ComponentManager & mgr = ComponentManager::get_instance();
+
+	std::vector<std::reference_wrapper<Camera>> cameras
+		= mgr.get_components_by_type<Camera>();
+
+	for (Camera & cam : cameras) {
+		SDLContext::get_instance().camera(cam);
+		this->curr_cam = &cam;
+	}
+}
+void RenderSystem::render_sprites() const {
 
 	ComponentManager & mgr = ComponentManager::get_instance();
 
@@ -28,14 +46,16 @@ void RenderSystem::update() {
 		= mgr.get_components_by_type<Sprite>();
 
 	SDLContext & render = SDLContext::get_instance();
-	render.clear_screen();
-
 	for (const Sprite & sprite : sprites) {
-		std::vector<std::reference_wrapper<Transform>> transforms
+		auto transforms
 			= mgr.get_components_by_id<Transform>(sprite.game_object_id);
-		for (const Transform & transform : transforms) {
-			render.draw(sprite, transform);
-		}
+		render.draw(sprite, transforms[0], *curr_cam);
 	}
-	render.present_screen();
+}
+
+void RenderSystem::update() {
+	this->clear_screen();
+	this->update_camera();
+	this->render_sprites();
+	this->present_screen();
 }
diff --git a/src/crepe/system/RenderSystem.h b/src/crepe/system/RenderSystem.h
index 4b910a4..70db21a 100644
--- a/src/crepe/system/RenderSystem.h
+++ b/src/crepe/system/RenderSystem.h
@@ -1,17 +1,64 @@
 #pragma once
 
+#include "api/Camera.h"
+
 #include "System.h"
 
 namespace crepe {
 
+/**
+ * \class RenderSystem
+ * \brief Manages rendering operations for all game objects.
+ *
+ * RenderSystem is responsible for rendering sprites, clearing and presenting the screen, 
+ * and managing the active camera. It functions as a singleton, providing centralized 
+ * rendering services for the application.
+ */
 class RenderSystem : public System {
 
 public:
+	/**
+	 * \brief Gets the singleton instance of RenderSystem.
+	 * \return Reference to the RenderSystem instance.
+	 */
 	static RenderSystem & get_instance();
-	void update();
+
+	/**
+	 * \brief Updates the RenderSystem for the current frame.
+	 * This method is called to perform all rendering operations for the current game frame.
+	 */
+	void update() override;
 
 private:
+	// Private constructor to enforce singleton pattern.
 	RenderSystem();
 	~RenderSystem();
+
+	//! Clears the screen in preparation for rendering.
+	void clear_screen() const;
+
+	//! Presents the rendered frame to the display.
+	void present_screen() const;
+
+	//! Updates the active camera used for rendering.
+	void update_camera();
+
+	//! Renders all active sprites to the screen.
+	void render_sprites() const;
+
+	/**
+	 * \todo Include color handling for sprites.
+	 * \todo Implement particle emitter rendering with sprites.
+	 * \todo Add text rendering using SDL_ttf for text components.
+	 * \todo Implement a text component and a button component.
+	 * \todo Ensure each sprite is checked for active status before rendering.
+	 * \todo Sort all layers by order before rendering.
+	 * \todo Consider adding text input functionality.
+	 */
+
+private:
+	//! Pointer to the current active camera for rendering
+	Camera * curr_cam = nullptr;
+	// TODO: needs a better solution
 };
 } // namespace crepe
diff --git a/src/crepe/util/Proxy.h b/src/crepe/util/Proxy.h
index fbfed0c..f84e462 100644
--- a/src/crepe/util/Proxy.h
+++ b/src/crepe/util/Proxy.h
@@ -16,9 +16,9 @@ template <typename T>
 class Proxy {
 public:
 	//! Set operator
-	Proxy & operator = (const T &);
+	Proxy & operator=(const T &);
 	//! Get operator
-	operator const T & ();
+	operator const T &();
 
 public:
 	Proxy(ValueBroker<T>);
@@ -27,7 +27,6 @@ private:
 	ValueBroker<T> broker;
 };
 
-}
+} // namespace crepe
 
 #include "Proxy.hpp"
-
diff --git a/src/crepe/util/Proxy.hpp b/src/crepe/util/Proxy.hpp
index 4aec9e9..b9923db 100644
--- a/src/crepe/util/Proxy.hpp
+++ b/src/crepe/util/Proxy.hpp
@@ -5,18 +5,17 @@
 namespace crepe {
 
 template <typename T>
-Proxy<T>::Proxy(ValueBroker<T> broker) : broker(broker) { }
+Proxy<T>::Proxy(ValueBroker<T> broker) : broker(broker) {}
 
 template <typename T>
-Proxy<T> & Proxy<T>::operator = (const T & val) {
+Proxy<T> & Proxy<T>::operator=(const T & val) {
 	this->broker.set(val);
 	return *this;
 }
 
 template <typename T>
-Proxy<T>::operator const T & () {
+Proxy<T>::operator const T &() {
 	return this->broker.get();
 }
 
-}
-
+} // namespace crepe
diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
index 36f9d4d..3a5b543 100644
--- a/src/example/CMakeLists.txt
+++ b/src/example/CMakeLists.txt
@@ -28,4 +28,6 @@ add_example(proxy)
 add_example(db)
 add_example(ecs)
 add_example(scene_manager)
+add_example(particles)
+add_example(gameloop)
 
diff --git a/src/example/db.cpp b/src/example/db.cpp
index c046421..8c06a84 100644
--- a/src/example/db.cpp
+++ b/src/example/db.cpp
@@ -1,12 +1,12 @@
-#include <crepe/facade/DB.h>
 #include <crepe/api/Config.h>
+#include <crepe/facade/DB.h>
 #include <crepe/util/log.h>
 
 using namespace crepe;
 using namespace std;
 
 // run before main
-static auto _ = [] () {
+static auto _ = []() {
 	auto & cfg = Config::get_instance();
 	cfg.log.level = LogLevel::TRACE;
 	return 0;
diff --git a/src/example/gameloop.cpp b/src/example/gameloop.cpp
new file mode 100644
index 0000000..a676f20
--- /dev/null
+++ b/src/example/gameloop.cpp
@@ -0,0 +1,7 @@
+#include "crepe/api/LoopManager.h"
+using namespace crepe;
+int main() {
+	LoopManager gameloop;
+	gameloop.start();
+	return 1;
+}
diff --git a/src/example/particles.cpp b/src/example/particles.cpp
new file mode 100644
index 0000000..6eab046
--- /dev/null
+++ b/src/example/particles.cpp
@@ -0,0 +1,43 @@
+#include <crepe/ComponentManager.h>
+#include <crepe/api/AssetManager.h>
+
+#include <crepe/Component.h>
+#include <crepe/api/Color.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/ParticleEmitter.h>
+#include <crepe/api/Rigidbody.h>
+#include <crepe/api/Sprite.h>
+#include <crepe/api/Texture.h>
+#include <crepe/api/Transform.h>
+
+using namespace crepe;
+using namespace std;
+
+int main(int argc, char * argv[]) {
+	GameObject game_object(0, "", "", Vector2{0, 0}, 0, 0);
+	Color color(0, 0, 0, 0);
+	Sprite test_sprite = game_object.add_component<Sprite>(
+		make_shared<Texture>("../asset/texture/img.png"), color,
+		FlipSettings{true, true});
+	game_object.add_component<ParticleEmitter>(ParticleEmitter::Data{
+		.position = {0, 0},
+		.max_particles = 100,
+		.emission_rate = 0,
+		.min_speed = 0,
+		.max_speed = 0,
+		.min_angle = 0,
+		.max_angle = 0,
+		.begin_lifespan = 0,
+		.end_lifespan = 0,
+		.force_over_time = Vector2{0, 0},
+		.boundary{
+			.width = 0,
+			.height = 0,
+			.offset = Vector2{0, 0},
+			.reset_on_exit = false,
+		},
+		.sprite = test_sprite,
+	});
+
+	return 0;
+}
diff --git a/src/example/proxy.cpp b/src/example/proxy.cpp
index 9f54f96..0afff41 100644
--- a/src/example/proxy.cpp
+++ b/src/example/proxy.cpp
@@ -5,15 +5,15 @@
 
 #include <crepe/ValueBroker.h>
 #include <crepe/api/Config.h>
-#include <crepe/util/log.h>
 #include <crepe/util/Proxy.h>
+#include <crepe/util/log.h>
 
 using namespace std;
 using namespace crepe;
 
-void test_ro_ref(const int & val) { }
-void test_rw_ref(int & val) { }
-void test_ro_val(int val) { }
+void test_ro_ref(const int & val) {}
+void test_rw_ref(int & val) {}
+void test_ro_val(int val) {}
 
 int main() {
 	auto & cfg = Config::get_instance();
@@ -21,18 +21,19 @@ int main() {
 
 	int real_value = 0;
 
-	ValueBroker<int> broker {
-		[&real_value] (const int & target) {
-			dbg_logf("set %s to %s", to_string(real_value).c_str(), to_string(target).c_str());
+	ValueBroker<int> broker{
+		[&real_value](const int & target) {
+			dbg_logf("set %s to %s", to_string(real_value).c_str(),
+					 to_string(target).c_str());
 			real_value = target;
 		},
-		[&real_value] () -> const int & {
+		[&real_value]() -> const int & {
 			dbg_logf("get %s", to_string(real_value).c_str());
 			return real_value;
 		},
 	};
 
-	Proxy<int> proxy { broker };
+	Proxy<int> proxy{broker};
 
 	broker.set(54);
 	proxy = 84;
@@ -43,4 +44,3 @@ int main() {
 
 	return 0;
 }
-
diff --git a/src/example/rendering.cpp b/src/example/rendering.cpp
index d554a8a..827ad07 100644
--- a/src/example/rendering.cpp
+++ b/src/example/rendering.cpp
@@ -1,3 +1,4 @@
+#include "api/Camera.h"
 #include <crepe/ComponentManager.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/system/RenderSystem.h>
@@ -23,26 +24,28 @@ int main() {
 	auto obj1 = GameObject(1, "name", "tag", Vector2{500, 0}, 1, 0.1);
 	auto obj2 = GameObject(2, "name", "tag", Vector2{800, 0}, 1, 0.1);
 
-	auto & mgr = AssetManager::get_instance();
 	// Normal adding components
 	{
 		Color color(0, 0, 0, 0);
 		obj.add_component<Sprite>(
 			make_shared<Texture>("../asset/texture/img.png"), color,
-			FlipSettings{true, true});
+			FlipSettings{false, false});
+		obj.add_component<Camera>(Color::get_red());
 	}
-
 	{
 		Color color(0, 0, 0, 0);
-		auto img = mgr.cache<Texture>("../asset/texture/second.png");
-		obj1.add_component<Sprite>(img, color, FlipSettings{true, true});
+		obj1.add_component<Sprite>(
+			make_shared<Texture>("../asset/texture/second.png"), color,
+			FlipSettings{true, true});
 	}
 
+	/*
 	{
 		Color color(0, 0, 0, 0);
 		auto img = mgr.cache<Texture>("../asset/texture/second.png");
 		obj2.add_component<Sprite>(img, color, FlipSettings{true, true});
 	}
+	*/
 
 	auto & sys = crepe::RenderSystem::get_instance();
 	auto start = std::chrono::steady_clock::now();
diff --git a/src/example/savemgr.cpp b/src/example/savemgr.cpp
index c8dd2bc..436fb5a 100644
--- a/src/example/savemgr.cpp
+++ b/src/example/savemgr.cpp
@@ -4,21 +4,21 @@
  */
 
 #include <cassert>
-#include <crepe/util/log.h>
-#include <crepe/util/Proxy.h>
-#include <crepe/api/SaveManager.h>
 #include <crepe/api/Config.h>
+#include <crepe/api/SaveManager.h>
+#include <crepe/util/Proxy.h>
+#include <crepe/util/log.h>
 
 using namespace crepe;
 
 // unrelated setup code
-int _ = [] () {
+int _ = []() {
 	// make sure all log messages get printed
 	auto & cfg = Config::get_instance();
 	cfg.log.level = LogLevel::TRACE;
 
 	return 0; // satisfy compiler
-} ();
+}();
 
 int main() {
 	const char * key = "mygame.test";
@@ -27,7 +27,7 @@ int main() {
 
 	dbg_logf("has key = %s", mgr.has(key) ? "true" : "false");
 	ValueBroker<int> prop = mgr.get<int>(key, 0);
-	Proxy<int> val        = mgr.get<int>(key, 0);
+	Proxy<int> val = mgr.get<int>(key, 0);
 
 	dbg_logf("val = %d", mgr.get<int>(key).get());
 	prop.set(1);
@@ -42,4 +42,3 @@ int main() {
 
 	return 0;
 }
-
diff --git a/src/makefile b/src/makefile
index b9c44c8..5f80204 100644
--- a/src/makefile
+++ b/src/makefile
@@ -1,104 +1,6 @@
 .PHONY: FORCE
 
-# STEPS FOR BIG CLEANUP
-#
-# 1. Change TODO to your name (in capitals) for each file in the list below
-#    that is yours (or you are going to fix)
-# 2. Update the name between parentheses below this list (see comment) to your
-#    name
-# 3. Create a git commit at this point (ensure `git status` reports "working
-#    tree clean")
-# 4. Run `make format` in the REPOSITORY ROOT DIRECTORY (NOT HERE), and start
-#    fixing reported errors or miscorrections manually until everything works
-#    again.
-# 5. Once everything is working again, create another git commit, and create a
-#    pull request. Make sure to ask someone to review the code standards for
-#    each ENTIRE FILE in this pull request.
-
-LOEK += crepe/Asset.cpp
-LOEK += crepe/Asset.h
-TODO += crepe/Collider.cpp
-TODO += crepe/Collider.h
-MAX += crepe/Component.cpp
-MAX += crepe/Component.h
-MAX += crepe/ComponentManager.cpp
-MAX += crepe/ComponentManager.h
-MAX += crepe/ComponentManager.hpp
-MAX += crepe/api/Metadata.cpp
-MAX += crepe/api/Metadata.h
-TODO += crepe/Particle.cpp
-TODO += crepe/Particle.h
-TODO += crepe/Position.h
-TODO += crepe/api/AssetManager.cpp
-TODO += crepe/api/AssetManager.h
-TODO += crepe/api/AssetManager.hpp
-LOEK += crepe/api/AudioSource.cpp
-LOEK += crepe/api/AudioSource.h
-LOEK += crepe/api/BehaviorScript.cpp
-LOEK += crepe/api/BehaviorScript.h
-LOEK += crepe/api/BehaviorScript.hpp
-TODO += crepe/api/CircleCollider.h
-TODO += crepe/api/Color.cpp
-TODO += crepe/api/Color.h
-LOEK += crepe/api/Config.h
-MAX += crepe/api/GameObject.cpp
-MAX += crepe/api/GameObject.h
-MAX += crepe/api/GameObject.hpp
-TODO += crepe/api/ParticleEmitter.cpp
-TODO += crepe/api/ParticleEmitter.h
-TODO += crepe/api/Vector2.h
-TODO += crepe/api/Vector2.cpp
-JARO += crepe/api/Rigidbody.cpp
-JARO += crepe/api/Rigidbody.h
-LOEK += crepe/api/Script.cpp
-LOEK += crepe/api/Script.h
-LOEK += crepe/api/Script.hpp
-TODO += crepe/api/Sprite.cpp
-TODO += crepe/api/Sprite.h
-TODO += crepe/api/Texture.cpp
-TODO += crepe/api/Texture.h
-MAX += crepe/api/Transform.cpp
-MAX += crepe/api/Transform.h
-TODO += crepe/facade/SDLContext.cpp
-TODO += crepe/facade/SDLContext.h
-LOEK += crepe/facade/Sound.cpp
-LOEK += crepe/facade/Sound.h
-LOEK += crepe/facade/SoundContext.cpp
-LOEK += crepe/facade/SoundContext.h
-TODO += crepe/system/CollisionSystem.cpp
-TODO += crepe/system/CollisionSystem.h
-TODO += crepe/system/ParticleSystem.cpp
-TODO += crepe/system/ParticleSystem.h
-JARO += crepe/system/PhysicsSystem.cpp
-JARO += crepe/system/PhysicsSystem.h
-TODO += crepe/system/RenderSystem.cpp
-TODO += crepe/system/RenderSystem.h
-LOEK += crepe/system/ScriptSystem.cpp
-LOEK += crepe/system/ScriptSystem.h
-LOEK += crepe/system/System.h
-LOEK += crepe/util/LogColor.cpp
-LOEK += crepe/util/LogColor.h
-LOEK += crepe/util/fmt.cpp
-LOEK += crepe/util/fmt.h
-LOEK += crepe/util/log.cpp
-LOEK += crepe/util/log.h
-TODO += example/asset_manager.cpp
-LOEK += example/audio_internal.cpp
-TODO += example/components_internal.cpp
-MAX += example/ecs.cpp
-LOEK += example/log.cpp
-TODO += example/particle.cpp
-JARO += example/physics.cpp
-TODO += example/rendering.cpp
-LOEK += example/script.cpp
-LOEK += test/audio.cpp
-LOEK += test/dummy.cpp
-JARO += test/PhysicsTest.cpp
-
-FMT := $(JARO) #<<< CHANGE THIS TO YOUR NAME FOR STEP 2
+FMT := $(shell git ls-files '*.c' '*.cpp' '*.h' '*.hpp')
 format: FORCE
 	clang-tidy -p build/compile_commands.json --fix-errors $(FMT)
 
-# FMT += $(shell git ls-files '*.c' '*.cpp' '*.h' '*.hpp')
-# TODO: re-enable linter after all corrections
-
diff --git a/src/test/AudioTest.cpp b/src/test/AudioTest.cpp
new file mode 100644
index 0000000..a9d5e6c
--- /dev/null
+++ b/src/test/AudioTest.cpp
@@ -0,0 +1,24 @@
+#include "system/AudioSystem.h"
+#include <gtest/gtest.h>
+
+#include <crepe/ComponentManager.h>
+#include <crepe/api/AudioSource.h>
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class AudioTest : public Test {
+public:
+	ComponentManager component_manager{};
+	AudioSystem system {component_manager};
+
+	void SetUp() override {
+		auto & mgr = this->component_manager;
+		GameObject entity = mgr.new_object("name");
+	}
+};
+
+TEST_F(AudioTest, Default) {
+}
+
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index 0e4eaed..f63a733 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -1,6 +1,6 @@
 target_sources(test_main PUBLIC
-	dummy.cpp
-	# audio.cpp
-	PhysicsTest.cpp
+	# PhysicsTest.cpp
+	# ParticleTest.cpp
+	AudioTest.cpp
 )
 
diff --git a/src/test/ParticleTest.cpp b/src/test/ParticleTest.cpp
new file mode 100644
index 0000000..6fe3133
--- /dev/null
+++ b/src/test/ParticleTest.cpp
@@ -0,0 +1,206 @@
+#include "api/Vector2.h"
+#include <crepe/ComponentManager.h>
+#include <crepe/Particle.h>
+#include <crepe/api/Config.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/ParticleEmitter.h>
+#include <crepe/api/Rigidbody.h>
+#include <crepe/api/Sprite.h>
+#include <crepe/api/Transform.h>
+#include <crepe/system/ParticleSystem.h>
+#include <gtest/gtest.h>
+#include <math.h>
+
+using namespace std;
+using namespace std::chrono_literals;
+using namespace crepe;
+
+class ParticlesTest : public ::testing::Test {
+protected:
+	ParticleSystem particle_system;
+	void SetUp() override {
+		ComponentManager & mgr = ComponentManager::get_instance();
+		std::vector<std::reference_wrapper<Transform>> transforms
+			= mgr.get_components_by_id<Transform>(0);
+		if (transforms.empty()) {
+
+			GameObject game_object(0, "", "", Vector2{0, 0}, 0, 0);
+
+			Color color(0, 0, 0, 0);
+			Sprite test_sprite = game_object.add_component<Sprite>(
+				make_shared<Texture>("../asset/texture/img.png"), color,
+				FlipSettings{true, true});
+
+			game_object.add_component<ParticleEmitter>(ParticleEmitter::Data{
+				.position = {0, 0},
+				.max_particles = 100,
+				.emission_rate = 0,
+				.min_speed = 0,
+				.max_speed = 0,
+				.min_angle = 0,
+				.max_angle = 0,
+				.begin_lifespan = 0,
+				.end_lifespan = 0,
+				.force_over_time = Vector2{0, 0},
+				.boundary{
+					.width = 0,
+					.height = 0,
+					.offset = Vector2{0, 0},
+					.reset_on_exit = false,
+				},
+				.sprite = test_sprite,
+			});
+		}
+		transforms = mgr.get_components_by_id<Transform>(0);
+		Transform & transform = transforms.front().get();
+		transform.position.x = 0.0;
+		transform.position.y = 0.0;
+		transform.rotation = 0.0;
+		std::vector<std::reference_wrapper<ParticleEmitter>> rigidbodies
+			= mgr.get_components_by_id<ParticleEmitter>(0);
+		ParticleEmitter & emitter = rigidbodies.front().get();
+		emitter.data.position = {0, 0};
+		emitter.data.emission_rate = 0;
+		emitter.data.min_speed = 0;
+		emitter.data.max_speed = 0;
+		emitter.data.min_angle = 0;
+		emitter.data.max_angle = 0;
+		emitter.data.begin_lifespan = 0;
+		emitter.data.end_lifespan = 0;
+		emitter.data.force_over_time = Vector2{0, 0};
+		emitter.data.boundary = {0, 0, Vector2{0, 0}, false};
+		for (auto & particle : emitter.data.particles) {
+			particle.active = false;
+		}
+	}
+};
+
+TEST_F(ParticlesTest, spawnParticle) {
+	Config::get_instance().physics.gravity = 1;
+	ComponentManager & mgr = ComponentManager::get_instance();
+	ParticleEmitter & emitter
+		= mgr.get_components_by_id<ParticleEmitter>(0).front().get();
+	emitter.data.end_lifespan = 5;
+	emitter.data.boundary.height = 100;
+	emitter.data.boundary.width = 100;
+	emitter.data.max_speed = 0.1;
+	emitter.data.max_angle = 0.1;
+	emitter.data.max_speed = 10;
+	emitter.data.max_angle = 10;
+	particle_system.update();
+	//check if nothing happend
+	EXPECT_EQ(emitter.data.particles[0].active, false);
+	emitter.data.emission_rate = 1;
+	//check particle spawnes
+	particle_system.update();
+	EXPECT_EQ(emitter.data.particles[0].active, true);
+	particle_system.update();
+	EXPECT_EQ(emitter.data.particles[1].active, true);
+	particle_system.update();
+	EXPECT_EQ(emitter.data.particles[2].active, true);
+	particle_system.update();
+	EXPECT_EQ(emitter.data.particles[3].active, true);
+
+	for (auto & particle : emitter.data.particles) {
+		// Check velocity range
+		EXPECT_GE(particle.velocity.x, emitter.data.min_speed);
+		// Speed should be greater than or equal to min_speed
+		EXPECT_LE(particle.velocity.x, emitter.data.max_speed);
+		// Speed should be less than or equal to max_speed
+		EXPECT_GE(particle.velocity.y, emitter.data.min_speed);
+		// Speed should be greater than or equal to min_speed
+		EXPECT_LE(particle.velocity.y, emitter.data.max_speed);
+		// Speed should be less than or equal to max_speed
+
+		// Check angle range
+		EXPECT_GE(particle.angle, emitter.data.min_angle);
+		// Angle should be greater than or equal to min_angle
+		EXPECT_LE(particle.angle, emitter.data.max_angle);
+		// Angle should be less than or equal to max_angle
+	}
+}
+
+TEST_F(ParticlesTest, moveParticleHorizontal) {
+	Config::get_instance().physics.gravity = 1;
+	ComponentManager & mgr = ComponentManager::get_instance();
+	ParticleEmitter & emitter
+		= mgr.get_components_by_id<ParticleEmitter>(0).front().get();
+	emitter.data.end_lifespan = 100;
+	emitter.data.boundary.height = 100;
+	emitter.data.boundary.width = 100;
+	emitter.data.min_speed = 1;
+	emitter.data.max_speed = 1;
+	emitter.data.max_angle = 0;
+	emitter.data.emission_rate = 1;
+	for (int a = 1; a < emitter.data.boundary.width / 2; a++) {
+		particle_system.update();
+		EXPECT_EQ(emitter.data.particles[0].position.x, a);
+	}
+}
+
+TEST_F(ParticlesTest, moveParticleVertical) {
+	Config::get_instance().physics.gravity = 1;
+	ComponentManager & mgr = ComponentManager::get_instance();
+	ParticleEmitter & emitter
+		= mgr.get_components_by_id<ParticleEmitter>(0).front().get();
+	emitter.data.end_lifespan = 100;
+	emitter.data.boundary.height = 100;
+	emitter.data.boundary.width = 100;
+	emitter.data.min_speed = 1;
+	emitter.data.max_speed = 1;
+	emitter.data.min_angle = 90;
+	emitter.data.max_angle = 90;
+	emitter.data.emission_rate = 1;
+	for (int a = 1; a < emitter.data.boundary.width / 2; a++) {
+		particle_system.update();
+		EXPECT_EQ(emitter.data.particles[0].position.y, a);
+	}
+}
+
+TEST_F(ParticlesTest, boundaryParticleReset) {
+	Config::get_instance().physics.gravity = 1;
+	ComponentManager & mgr = ComponentManager::get_instance();
+	ParticleEmitter & emitter
+		= mgr.get_components_by_id<ParticleEmitter>(0).front().get();
+	emitter.data.end_lifespan = 100;
+	emitter.data.boundary.height = 10;
+	emitter.data.boundary.width = 10;
+	emitter.data.boundary.reset_on_exit = true;
+	emitter.data.min_speed = 1;
+	emitter.data.max_speed = 1;
+	emitter.data.min_angle = 90;
+	emitter.data.max_angle = 90;
+	emitter.data.emission_rate = 1;
+	for (int a = 0; a < emitter.data.boundary.width / 2 + 1; a++) {
+		particle_system.update();
+	}
+	EXPECT_EQ(emitter.data.particles[0].active, false);
+}
+
+TEST_F(ParticlesTest, boundaryParticleStop) {
+	Config::get_instance().physics.gravity = 1;
+	ComponentManager & mgr = ComponentManager::get_instance();
+	ParticleEmitter & emitter
+		= mgr.get_components_by_id<ParticleEmitter>(0).front().get();
+	emitter.data.end_lifespan = 100;
+	emitter.data.boundary.height = 10;
+	emitter.data.boundary.width = 10;
+	emitter.data.boundary.reset_on_exit = false;
+	emitter.data.min_speed = 1;
+	emitter.data.max_speed = 1;
+	emitter.data.min_angle = 90;
+	emitter.data.max_angle = 90;
+	emitter.data.emission_rate = 1;
+	for (int a = 0; a < emitter.data.boundary.width / 2 + 1; a++) {
+		particle_system.update();
+	}
+	const double TOLERANCE = 0.01;
+	EXPECT_NEAR(emitter.data.particles[0].velocity.x, 0, TOLERANCE);
+	EXPECT_NEAR(emitter.data.particles[0].velocity.y, 0, TOLERANCE);
+	if (emitter.data.particles[0].velocity.x != 0)
+		EXPECT_NEAR(std::abs(emitter.data.particles[0].position.x),
+					emitter.data.boundary.height / 2, TOLERANCE);
+	if (emitter.data.particles[0].velocity.y != 0)
+		EXPECT_NEAR(std::abs(emitter.data.particles[0].position.y),
+					emitter.data.boundary.width / 2, TOLERANCE);
+}
diff --git a/src/test/audio.cpp b/src/test/audio.cpp
deleted file mode 100644
index d6ff689..0000000
--- a/src/test/audio.cpp
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <gtest/gtest.h>
-
-using namespace std;
-using namespace std::chrono_literals;
-
-// using namespace crepe;
-
-// TODO: mock internal audio class
-
-TEST(audio, play) { ASSERT_TRUE(true); }
diff --git a/src/test/dummy.cpp b/src/test/dummy.cpp
deleted file mode 100644
index a00a9c6..0000000
--- a/src/test/dummy.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-#include <gtest/gtest.h>
-
-TEST(dummy, foo) { ASSERT_TRUE(1); }