refactor: Actions to Delegates

- TryGetBehaviourInParent
- GetBehaviourInParent
- TryGetBehaviourInChildren
- GetBehaviourInChildren

Engine.Core/Abstract/Assignable/IAssignable.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IAssignable"/>'s fields are unassigned and completely ready to recycle.
     /// </summary> 
-    Action<IAssignable>? OnUnassigned { get; set; }
+    event OnUnassignedDelegate? OnUnassigned;
 
     /// <summary>
     /// Unassign <see cref="IAssignable"/>'s all fields and make it ready to recycle.
@@ -19,4 +17,6 @@ public interface IAssignable
     /// <see cref="true"/>, if the fields are unsigned successfully, <see cref="false"/> if not.
     /// </returns>
     bool Unassign();
+
+    delegate void OnUnassignedDelegate(IAssignable sender);
 }

Engine.Core/Abstract/Assignable/IAssignableBehaviourController.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignableBehaviourController : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IBehaviourController"/> value has has been assigned a new value.
     /// </summary>
-    Action<IAssignableBehaviourController>? OnBehaviourControllerAssigned { get; set; }
+    event OnBehaviourControllerAssignedDelegate? OnBehaviourControllerAssigned;
 
     /// <inheritdoc cref="IBehaviourController" />
     IBehaviourController BehaviourController { get; }
@@ -23,4 +21,6 @@ public interface IAssignableBehaviourController : IAssignable
     /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
     /// </returns>
     bool Assign(IBehaviourController behaviourController);
+
+    delegate void OnBehaviourControllerAssignedDelegate(IAssignableBehaviourController sender);
 }

Engine.Core/Abstract/Assignable/IAssignableEntity.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignableEntity : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IEntity"/> value has has been assigned a new value.
     /// </summary>
-    Action<IAssignableEntity>? OnEntityAssigned { get; set; }
+    event OnEntityAssignedDelegate? OnEntityAssigned;
 
     /// <inheritdoc cref="IEntity" />
     IEntity Entity { get; }
@@ -23,4 +21,6 @@ public interface IAssignableEntity : IAssignable
     /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
     /// </returns>
     bool Assign(IEntity entity);
+
+    delegate void OnEntityAssignedDelegate(IAssignableEntity sender);
 }

Engine.Core/Abstract/Assignable/IAssignableGameManager.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignableGameManager : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IGameManager"/> value has has been assigned a new value.
     /// </summary>
-    Action<IAssignableGameManager>? OnGameManagerAssigned { get; set; }
+    event OnGameManagerAssignedDelegate? OnGameManagerAssigned;
 
     /// <inheritdoc cref="IGameManager" />
     IGameManager GameManager { get; }
@@ -23,4 +21,6 @@ public interface IAssignableGameManager : IAssignable
     /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
     /// </returns>
     bool Assign(IGameManager gameManager);
+
+    delegate void OnGameManagerAssignedDelegate(IAssignableGameManager sender);
 }

Engine.Core/Abstract/Assignable/IAssignableGameObject.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignableGameObject : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IGameObject"/> value has has been assigned a new value.
     /// </summary>
-    Action<IAssignableGameObject>? OnGameObjectAssigned { get; set; }
+    event OnGameObjectAssignedDelegate? OnGameObjectAssigned;
 
     /// <inheritdoc cref="IGameObject" />
     IGameObject GameObject { get; }
@@ -23,4 +21,6 @@ public interface IAssignableGameObject : IAssignable
     /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
     /// </returns>
     bool Assign(IGameObject gameObject);
+
+    delegate void OnGameObjectAssignedDelegate(IAssignableGameObject sender);
 }

Engine.Core/Abstract/Assignable/IAssignableStateEnable.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignableStateEnable : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IStateEnable"/> value has has been assigned a new value.
     /// </summary>
-    Action<IAssignableStateEnable>? OnStateEnableAssigned { get; set; }
+    event OnStateEnableAssignedDelegate? OnStateEnableAssigned;
 
     /// <inheritdoc cref="IStateEnable" />
     IStateEnable StateEnable { get; }
@@ -23,4 +21,6 @@ public interface IAssignableStateEnable : IAssignable
     /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
     /// </returns>
     bool Assign(IStateEnable stateEnable);
+
+    delegate void OnStateEnableAssignedDelegate(IAssignableStateEnable sender);
 }

Engine.Core/Abstract/Assignable/IAssignableTransform.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IAssignableTransform : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="ITransform"/> value has has been assigned a new value.
     /// </summary>
-    Action<IAssignableTransform>? OnTransformAssigned { get; set; }
+    event OnTransformAssignedDelegate? OnTransformAssigned;
 
     /// <inheritdoc cref="ITransform" />
     ITransform Transform { get; }
@@ -23,4 +21,6 @@ public interface IAssignableTransform : IAssignable
     /// <see cref="true"/>, if the value given assigned successfully assigned, <see cref="false"/> if not.
     /// </returns>
     bool Assign(ITransform transform);
+
+    delegate void OnTransformAssignedDelegate(IAssignableTransform sender);
 }

Engine.Core/Abstract/BaseEntity.cs

@@ -4,13 +4,13 @@ namespace Syntriax.Engine.Core.Abstract;
 
 public abstract class BaseEntity : IEntity
 {
-    public Action<IEntity, string>? OnIdChanged { get; set; } = null;
+    public event IEntity.OnIdChangedDelegate? OnIdChanged = null;
 
-    public Action<IAssignable>? OnUnassigned { get; set; } = null;
+    public event IInitialize.OnInitializedDelegate? OnInitialized = null;
-    public Action<IAssignableStateEnable>? OnStateEnableAssigned { get; set; } = null;
+    public event IInitialize.OnFinalizedDelegate? OnFinalized = null;
 
-    public Action<IInitialize>? OnInitialized { get; set; } = null;
+    public event IAssignableStateEnable.OnStateEnableAssignedDelegate? OnStateEnableAssigned = null;
-    public Action<IInitialize>? OnFinalized { get; set; } = null;
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
 
 
     private IStateEnable _stateEnable = null!;

Engine.Core/Abstract/IBehaviour.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,7 +8,7 @@ public interface IBehaviour : IEntity, IAssignableBehaviourController, IAssignab
     /// <summary>
     /// Event triggered when the priority of the <see cref="IBehaviour"/> changes.
     /// </summary>
-    Action<IBehaviour>? OnPriorityChanged { get; set; }
+    event OnPriorityChangedDelegate? OnPriorityChanged;
 
     /// <summary>
     /// The priority of the <see cref="IBehaviour"/>.
@@ -21,4 +19,6 @@ public interface IBehaviour : IEntity, IAssignableBehaviourController, IAssignab
     /// The value indicating whether the <see cref="IBehaviour"/> is active.
     /// </summary>
     bool IsActive { get; }
+
+    delegate void OnPriorityChangedDelegate(IBehaviour sender, int previousPriority);
 }

Engine.Core/Abstract/IBehaviourController.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 
@@ -12,27 +11,27 @@ public interface IBehaviourController : IAssignableGameObject, IEnumerable<IBeha
     /// <summary>
     /// Event triggered before the update of <see cref="IBehaviour"/>s.
     /// </summary>
-    Action<IBehaviourController>? OnPreUpdate { get; set; }
+    event OnPreUpdateDelegate? OnPreUpdate;
 
     /// <summary>
     /// Event triggered during the update of <see cref="IBehaviour"/>s.
     /// </summary>
-    Action<IBehaviourController>? OnUpdate { get; set; }
+    event OnUpdateDelegate? OnUpdate;
 
     /// <summary>
     /// Event triggered before the drawing phase.
     /// </summary>
-    Action<IBehaviourController>? OnPreDraw { get; set; }
+    event OnPreDrawDelegate? OnPreDraw;
 
     /// <summary>
     /// Event triggered when a <see cref="IBehaviour"/> is added to the <see cref="IBehaviourController"/>.
     /// </summary>
-    Action<IBehaviourController, IBehaviour>? OnBehaviourAdded { get; set; }
+    event OnBehaviourAddedDelegate? OnBehaviourAdded;
 
     /// <summary>
     /// Event triggered when a <see cref="IBehaviour"/> is removed from the <see cref="IBehaviourController"/>.
     /// </summary>
-    Action<IBehaviourController, IBehaviour>? OnBehaviourRemoved { get; set; }
+    event OnBehaviourRemovedDelegate? OnBehaviourRemoved;
 
     /// <summary>
     /// Adds a <see cref="IBehaviour"/> to the <see cref="IBehaviourController"/>.
@@ -102,4 +101,11 @@ public interface IBehaviourController : IAssignableGameObject, IEnumerable<IBeha
     /// Performs pre-draw operations.
     /// </summary>
     void UpdatePreDraw();
+
+    delegate void OnPreUpdateDelegate(IBehaviourController sender);
+    delegate void OnUpdateDelegate(IBehaviourController sender);
+    delegate void OnPreDrawDelegate(IBehaviourController sender);
+    delegate void OnBehaviourAddedDelegate(IBehaviourController sender, IBehaviour behaviourAdded);
+    delegate void OnBehaviourRemovedDelegate(IBehaviourController sender, IBehaviour behaviourRemoved);
+
 }

Engine.Core/Abstract/IEntity.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -11,10 +9,12 @@ public interface IEntity : IInitialize, IAssignableStateEnable
     /// Event triggered when the <see cref="Id"/> of the <see cref="IEntity"/> changes.
     /// The string action parameter is the previous <see cref="Id"/> of the <see cref="IEntity"/>. 
     /// </summary>
-    Action<IEntity, string>? OnIdChanged { get; set; }
+    event OnIdChangedDelegate? OnIdChanged;
 
     /// <summary>
     /// The ID of the <see cref="IEntity"/>.
     /// </summary>
     string Id { get; set; }
+
+    delegate void OnIdChangedDelegate(IEntity sender, string previousId);
 }

Engine.Core/Abstract/IGameManager.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 
 namespace Syntriax.Engine.Core.Abstract;
@@ -11,12 +10,12 @@ public interface IGameManager : IEntity, IEnumerable<IGameObject>
     /// <summary>
     /// Event triggered when a <see cref="IGameObject"/> is registered to the <see cref="IGameManager"/>.
     /// </summary>
-    Action<IGameManager, IGameObject>? OnGameObjectRegistered { get; set; }
+    event OnGameObjectRegisteredDelegate? OnGameObjectRegistered;
 
     /// <summary>
     /// Event triggered when a <see cref="IGameObject"/> is unregistered from the <see cref="IGameManager"/>.
     /// </summary>
-    Action<IGameManager, IGameObject>? OnGameObjectUnRegistered { get; set; }
+    event OnGameObjectUnRegisteredDelegate? OnGameObjectUnRegistered;
 
     /// <summary>
     /// Gets a read-only list of <see cref="IGameObject"/>s managed by the <see cref="IGameManager"/>.
@@ -54,4 +53,7 @@ public interface IGameManager : IEntity, IEnumerable<IGameObject>
     /// Performs operations that should be done before the draw calls.
     /// </summary>
     void PreDraw();
+
+    delegate void OnGameObjectRegisteredDelegate(IGameManager sender, IGameObject gameObjectRegistered);
+    delegate void OnGameObjectUnRegisteredDelegate(IGameManager sender, IGameObject gameObjectUnregistered);
 }

Engine.Core/Abstract/IGameObject.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,10 +8,12 @@ public interface IGameObject : IEntity, IAssignableGameManager, IAssignableTrans
     /// <summary>
     /// Event triggered when the <see cref="Update"/> method is called.
     /// </summary>
-    Action<IGameObject>? OnUpdated { get; set; }
+    event OnUpdatedDelegate? OnUpdated;
 
     /// <summary>
     /// Updates the game object.
     /// </summary>
     void Update();
+
+    delegate void OnUpdatedDelegate(IGameObject sender);
 }

Engine.Core/Abstract/IInitialize.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,12 +8,12 @@ public interface IInitialize
     /// <summary>
     /// Event triggered when the <see cref="Initialize"/> method is called successfully.
     /// </summary>
-    Action<IInitialize>? OnInitialized { get; set; }
+    event OnInitializedDelegate? OnInitialized;
 
     /// <summary>
     /// Event triggered when the <see cref="Finalize"/> method is called successfully.
     /// </summary>
-    Action<IInitialize>? OnFinalized { get; set; }
+    event OnFinalizedDelegate? OnFinalized;
 
     /// <summary>
     /// The value indicating whether the entity has been initialized.
@@ -33,4 +31,7 @@ public interface IInitialize
     /// </summary>
     /// <returns><see cref="true"/> if finalization is successful, otherwise <see cref="false"/>.</returns>
     bool Finalize();
+
+    delegate void OnInitializedDelegate(IInitialize sender);
+    delegate void OnFinalizedDelegate(IInitialize sender);
 }

Engine.Core/Abstract/INameable.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,10 +8,12 @@ public interface INameable
     /// <summary>
     /// Event triggered when the name of the entity changes.
     /// </summary>
-    Action<IEntity>? OnNameChanged { get; set; }
+    event OnNameChangedDelegate? OnNameChanged;
 
     /// <summary>
     /// The name of the entity.
     /// </summary>
     string Name { get; set; }
+
+    delegate void OnNameChangedDelegate(INameable sender, string previousName);
 }

Engine.Core/Abstract/IStateEnable.cs

@@ -1,5 +1,3 @@
-using System;
-
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
@@ -10,10 +8,12 @@ public interface IStateEnable : IAssignableEntity
     /// <summary>
     /// Event triggered when the <see cref="Enabled"/> state of the <see cref="IStateEnable"/> changes.
     /// </summary>
-    Action<IStateEnable>? OnEnabledChanged { get; set; }
+    event OnNameChangedDelegate? OnEnabledChanged;
 
     /// <summary>
     /// The value indicating whether the <see cref="IStateEnable"/> is enabled.
     /// </summary>
     bool Enabled { get; set; }
+
+    delegate void OnNameChangedDelegate(IStateEnable sender, bool previousState);
 }

Engine.Core/Abstract/ITransform.cs

@@ -1,39 +1,105 @@
 using System;
+using System.Collections.Generic;
 
 namespace Syntriax.Engine.Core.Abstract;
 
 /// <summary>
 /// Represents the transformation properties of an object such as position, scale, and rotation.
 /// </summary>
-public interface ITransform
+public interface ITransform : IAssignableGameObject, IEnumerable<ITransform>
 {
     /// <summary>
     /// Event triggered when the <see cref="Position"/> of the <see cref="ITransform"/> changes.
     /// </summary>
-    Action<ITransform>? OnPositionChanged { get; set; }
+    event OnPositionChangedDelegate? OnPositionChanged;
 
     /// <summary>
     /// Event triggered when the <see cref="Scale"/> of the <see cref="ITransform"/> changes.
     /// </summary>
-    Action<ITransform>? OnScaleChanged { get; set; }
+    event OnScaleChangedDelegate? OnScaleChanged;
 
     /// <summary>
     /// Event triggered when the <see cref="Rotation"/> of the <see cref="ITransform"/> changes.
     /// </summary>
-    Action<ITransform>? OnRotationChanged { get; set; }
+    event OnRotationChangedDelegate? OnRotationChanged;
 
     /// <summary>
-    /// The position of the <see cref="ITransform"/> in 2D space.
+    /// Event triggered when the <see cref="Parent"/> of the <see cref="ITransform"/> changes. The second parameter is the old <see cref="ITransform"/>.
+    /// </summary>
+    event OnParentChangedDelegate? OnParentChanged;
+
+    /// <summary>
+    /// Event triggered when a new <see cref="ITransform"/> is added to the <see cref="Children"/>.
+    /// </summary>
+    event OnChildrenAddedDelegate? OnChildrenAdded;
+
+    /// <summary>
+    /// Event triggered when an <see cref="ITransform"/> is removed from the <see cref="Children"/>.
+    /// </summary>
+    event OnChildrenRemovedDelegate? OnChildrenRemoved;
+
+    /// <summary>
+    /// The world position of the <see cref="ITransform"/> in 2D space.
     /// </summary>
     Vector2D Position { get; set; }
 
     /// <summary>
-    /// The scale of the <see cref="ITransform"/>.
+    /// The world scale of the <see cref="ITransform"/>.
     /// </summary>
     Vector2D Scale { get; set; }
 
     /// <summary>
-    /// The rotation of the <see cref="ITransform"/> in degrees.
+    /// The world rotation of the <see cref="ITransform"/> in degrees.
     /// </summary>
     float Rotation { get; set; }
+
+    /// <summary>
+    /// The local position of the <see cref="ITransform"/> in 2D space.
+    /// </summary>
+    Vector2D LocalPosition { get; set; }
+
+    /// <summary>
+    /// The local scale of the <see cref="ITransform"/>.
+    /// </summary>
+    Vector2D LocalScale { get; set; }
+
+    /// <summary>
+    /// The local rotation of the <see cref="ITransform"/> in degrees.
+    /// </summary>
+    float LocalRotation { get; set; }
+
+    /// <summary>
+    /// The parent <see cref="ITransform"/> of the <see cref="ITransform"/>.
+    /// </summary>
+    ITransform? Parent { get; }
+
+    /// <summary>
+    /// The <see cref="ITransform"/>s that have this <see cref="ITransform"/> as their <see cref="Parent"/>.
+    /// </summary>
+    IReadOnlyList<ITransform> Children { get; }
+
+    /// <summary>
+    /// Sets the parent <see cref="ITransform"/> of this <see cref="ITransform"/>.
+    /// </summary>
+    /// <param name="transform">The parent <see cref="ITransform"/> to set.</param>
+    void SetParent(ITransform? transform);
+
+    /// <summary>
+    /// Adds a child <see cref="ITransform"/> to this <see cref="ITransform"/>.
+    /// </summary>
+    /// <param name="transform">The child <see cref="ITransform"/> to add.</param>
+    void AddChild(ITransform transform);
+
+    /// <summary>
+    /// Removes a child <see cref="ITransform"/> from this <see cref="ITransform"/>.
+    /// </summary>
+    /// <param name="transform">The child <see cref="ITransform"/> to remove.</param>
+    void RemoveChild(ITransform transform);
+
+    delegate void OnPositionChangedDelegate(ITransform sender);
+    delegate void OnScaleChangedDelegate(ITransform sender);
+    delegate void OnRotationChangedDelegate(ITransform sender);
+    delegate void OnParentChangedDelegate(ITransform sender, ITransform? newParent);
+    delegate void OnChildrenAddedDelegate(ITransform sender, ITransform childrenAdded);
+    delegate void OnChildrenRemovedDelegate(ITransform sender, ITransform childrenRemoved);
 }

Engine.Core/Behaviour.cs

@@ -1,5 +1,3 @@
-using System;
-
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Core.Exceptions;
 
@@ -8,15 +6,16 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("{GetType().Name, nq}, Priority: {Priority}, Initialized: {Initialized}")]
 public abstract class Behaviour : BaseEntity, IBehaviour
 {
-    public Action<IAssignableBehaviourController>? OnBehaviourControllerAssigned { get; set; } = null;
+    public event IAssignableBehaviourController.OnBehaviourControllerAssignedDelegate? OnBehaviourControllerAssigned = null;
 
-    public Action<IBehaviour>? OnPriorityChanged { get; set; } = null;
+    public event IBehaviour.OnPriorityChangedDelegate? OnPriorityChanged = null;
 
 
     private IBehaviourController _behaviourController = null!;
 
     private int _priority = 0;
 
+
     public IBehaviourController BehaviourController => _behaviourController;
 
     public override bool IsActive => base.IsActive && BehaviourController.GameObject.StateEnable.Enabled;
@@ -29,8 +28,9 @@ public abstract class Behaviour : BaseEntity, IBehaviour
             if (value == _priority)
                 return;
 
+            int previousPriority = _priority;
             _priority = value;
-            OnPriorityChanged?.Invoke(this);
+            OnPriorityChanged?.Invoke(this, previousPriority);
         }
     }
 

Engine.Core/BehaviourCollector.cs

@@ -6,13 +6,13 @@ using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Core;
 
-public class BehaviourCacher<T> : IAssignableGameManager, IEnumerable<T>
+public class BehaviourCollector<T> : IAssignableGameManager, IEnumerable<T>
 {
-    public Action<IAssignable>? OnUnassigned { get; set; } = null;
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
-    public Action<IAssignableGameManager>? OnGameManagerAssigned { get; set; } = null;
+    public event IAssignableGameManager.OnGameManagerAssignedDelegate? OnGameManagerAssigned = null;
 
-    public Action<BehaviourCacher<T>, T>? OnCached { get; set; } = null;
+    public event OnCollectedDelegate? OnCollected = null;
-    public Action<BehaviourCacher<T>, T>? OnUncached { get; set; } = null;
+    public event OnRemovedDelegate? OnRemoved = null;
 
     private readonly List<T> _behaviours = new(32);
 
@@ -21,8 +21,8 @@ public class BehaviourCacher<T> : IAssignableGameManager, IEnumerable<T>
 
     public T this[Index index] => _behaviours[index];
 
-    public BehaviourCacher() { }
+    public BehaviourCollector() { }
-    public BehaviourCacher(IGameManager gameManager) => Assign(gameManager);
+    public BehaviourCollector(IGameManager gameManager) => Assign(gameManager);
 
     private void OnGameObjectRegistered(IGameManager manager, IGameObject gameObject)
     {
@@ -42,7 +42,7 @@ public class BehaviourCacher<T> : IAssignableGameManager, IEnumerable<T>
             return;
 
         _behaviours.Add(tBehaviour);
-        OnCached?.Invoke(this, tBehaviour);
+        OnCollected?.Invoke(this, tBehaviour);
     }
 
     private void OnBehaviourRemoved(IBehaviourController controller, IBehaviour behaviour)
@@ -53,7 +53,7 @@ public class BehaviourCacher<T> : IAssignableGameManager, IEnumerable<T>
         if (!_behaviours.Remove(tBehaviour))
             return;
 
-        OnUncached?.Invoke(this, tBehaviour);
+        OnRemoved?.Invoke(this, tBehaviour);
     }
 
     public bool Assign(IGameManager gameManager)
@@ -99,4 +99,8 @@ public class BehaviourCacher<T> : IAssignableGameManager, IEnumerable<T>
 
     public IEnumerator<T> GetEnumerator() => _behaviours.GetEnumerator();
     IEnumerator IEnumerable.GetEnumerator() => _behaviours.GetEnumerator();
+
+
+    public delegate void OnCollectedDelegate(BehaviourCollector<T> sender, T behaviourCollected);
+    public delegate void OnRemovedDelegate(BehaviourCollector<T> sender, T behaviourRemoved);
 }

Engine.Core/BehaviourController.cs

@@ -11,14 +11,14 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("Behaviour Count: {behaviours.Count}")]
 public class BehaviourController : IBehaviourController
 {
-    public Action<IBehaviourController>? OnPreUpdate { get; set; }
+    public event IBehaviourController.OnPreUpdateDelegate? OnPreUpdate = null;
-    public Action<IBehaviourController>? OnUpdate { get; set; } = null;
+    public event IBehaviourController.OnUpdateDelegate? OnUpdate = null;
-    public Action<IBehaviourController>? OnPreDraw { get; set; } = null;
+    public event IBehaviourController.OnPreDrawDelegate? OnPreDraw = null;
 
-    public Action<IBehaviourController, IBehaviour>? OnBehaviourAdded { get; set; } = null;
+    public event IBehaviourController.OnBehaviourAddedDelegate? OnBehaviourAdded = null;
-    public Action<IBehaviourController, IBehaviour>? OnBehaviourRemoved { get; set; } = null;
+    public event IBehaviourController.OnBehaviourRemovedDelegate? OnBehaviourRemoved = null;
-    public Action<IAssignable>? OnUnassigned { get; set; } = null;
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned;
-    public Action<IAssignableGameObject>? OnGameObjectAssigned { get; set; } = null;
+    public event IAssignableGameObject.OnGameObjectAssignedDelegate? OnGameObjectAssigned = null;
 
 
     private readonly IList<IBehaviour> behaviours = new List<IBehaviour>(Constants.BEHAVIOURS_SIZE_INITIAL);
@@ -165,10 +165,11 @@ public class BehaviourController : IBehaviourController
             behaviours.Add(behaviour);
     }
 
-    private void OnPriorityChange(IBehaviour behaviour)
+
+    private void OnPriorityChange(IBehaviour sender, int previousPriority)
     {
-        behaviours.Remove(behaviour);
+        behaviours.Remove(sender);
-        InsertBehaviourByPriority(behaviour);
+        InsertBehaviourByPriority(sender);
     }
 
     public IEnumerator<IBehaviour> GetEnumerator() => behaviours.GetEnumerator();

Engine.Core/Extensions/BehaviourControllerExtensions.cs

@@ -0,0 +1,47 @@
+using System.Diagnostics.CodeAnalysis;
+
+using Syntriax.Engine.Core.Abstract;
+
+namespace Syntriax.Engine.Core;
+
+public static class BehaviourControllerExtensions
+{
+    public static bool TryGetBehaviourInParent<T>(this IBehaviourController behaviourController, [NotNullWhen(returnValue: true)] out T? behaviour) where T : class
+    {
+        behaviour = GetBehaviourInParent<T>(behaviourController);
+        return behaviour is not null;
+    }
+
+    public static T? GetBehaviourInParent<T>(this IBehaviourController behaviourController) where T : class
+    {
+        IBehaviourController? controller = behaviourController;
+
+        while (controller is not null)
+        {
+            if (behaviourController.GetBehaviour<T>() is T behaviour)
+                return behaviour;
+
+            controller = controller.GameObject.Transform.Parent?.GameObject.BehaviourController;
+        }
+
+        return default;
+    }
+
+    public static bool TryGetBehaviourInChildren<T>(this IBehaviourController behaviourController, [NotNullWhen(returnValue: true)] out T? behaviour) where T : class
+    {
+        behaviour = GetBehaviourInChildren<T>(behaviourController);
+        return behaviour is not null;
+    }
+
+    public static T? GetBehaviourInChildren<T>(this IBehaviourController behaviourController) where T : class
+    {
+        if (behaviourController.GetBehaviour<T>() is T localBehaviour)
+            return localBehaviour;
+
+        foreach (ITransform transform in behaviourController.GameObject.Transform)
+            if (GetBehaviourInChildren<T>(transform.GameObject.BehaviourController) is T behaviour)
+                return behaviour;
+
+        return default;
+    }
+}

Engine.Core/Extensions/BehaviourExtensions.cs

@@ -7,18 +7,22 @@ namespace Syntriax.Engine.Core;
 
 public static class BehaviourExtensions
 {
-    public static bool TryFindBehaviour<T>(this IEnumerable<IGameObject> gameObjects, [NotNullWhen(returnValue: true)] out T? behaviour)
+    public static T? FindBehaviour<T>(this IEnumerable<IGameObject> gameObjects) where T : class
     {
-        behaviour = default;
-
         foreach (IGameObject gameObject in gameObjects)
-            if (gameObject.BehaviourController.TryGetBehaviour(out behaviour))
+            if (gameObject.BehaviourController.TryGetBehaviour(out T? behaviour))
-                return true;
+                return behaviour;
 
-        return false;
+        return default;
     }
 
-    public static void FindBehaviours<T>(this IEnumerable<IGameObject> gameObjects, List<T> behaviours)
+    public static bool TryFindBehaviour<T>(this IEnumerable<IGameObject> gameObjects, [NotNullWhen(returnValue: true)] out T? behaviour) where T : class
+    {
+        behaviour = FindBehaviour<T>(gameObjects);
+        return behaviour is not null;
+    }
+
+    public static void FindBehaviours<T>(this IEnumerable<IGameObject> gameObjects, List<T> behaviours) where T : class
     {
         behaviours.Clear();
         List<T> cache = [];

Engine.Core/Extensions/TransformExtensions.cs

@@ -4,11 +4,16 @@ namespace Syntriax.Engine.Core;
 
 public static class TransformExtensions
 {
-    public static ITransform SetTransform(this ITransform transform, Vector2D? position = null, float? rotation = null, Vector2D? scale = null)
+    public static ITransform SetTransform(this ITransform transform,
+        Vector2D? position = null, float? rotation = null, Vector2D? scale = null,
+        Vector2D? localPosition = null, float? localRotation = null, Vector2D? localScale = null)
     {
         if (position.HasValue) transform.Position = position.Value;
         if (rotation.HasValue) transform.Rotation = rotation.Value;
         if (scale.HasValue) transform.Scale = scale.Value;
+        if (localPosition.HasValue) transform.LocalPosition = localPosition.Value;
+        if (localRotation.HasValue) transform.LocalRotation = localRotation.Value;
+        if (localScale.HasValue) transform.LocalScale = localScale.Value;
         return transform;
     }
 }

Engine.Core/Factory/GameObjectFactory.cs

@@ -22,6 +22,9 @@ public class GameObjectFactory
         behaviourController ??= TypeFactory.Get<BehaviourController>();
         stateEnable ??= TypeFactory.Get<StateEnable>();
 
+        if (!transform.Assign(gameObject))
+            throw AssignException.From(transform, gameObject);
+
         if (!behaviourController.Assign(gameObject))
             throw AssignException.From(behaviourController, gameObject);
         if (!stateEnable.Assign(gameObject))

Engine.Core/GameManager.cs

@@ -11,8 +11,8 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("GameObject Count: {_gameObjects.Count}")]
 public class GameManager : BaseEntity, IGameManager
 {
-    public Action<IGameManager, IGameObject>? OnGameObjectRegistered { get; set; } = null;
+    public event IGameManager.OnGameObjectRegisteredDelegate? OnGameObjectRegistered = null;
-    public Action<IGameManager, IGameObject>? OnGameObjectUnRegistered { get; set; } = null;
+    public event IGameManager.OnGameObjectUnRegisteredDelegate? OnGameObjectUnRegistered = null;
 
 
     private readonly List<IGameObject> _gameObjects = new(Constants.GAME_OBJECTS_SIZE_INITIAL);

Engine.Core/GameObject.cs

@@ -1,5 +1,3 @@
-using System;
-
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Core.Exceptions;
 
@@ -8,13 +6,13 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("Name: {Name}, Initialized: {Initialized}")]
 public class GameObject : BaseEntity, IGameObject
 {
-    public Action<IAssignableTransform>? OnTransformAssigned { get; set; } = null;
+    public event IAssignableTransform.OnTransformAssignedDelegate? OnTransformAssigned = null;
-    public Action<IAssignableBehaviourController>? OnBehaviourControllerAssigned { get; set; } = null;
+    public event IAssignableGameManager.OnGameManagerAssignedDelegate? OnGameManagerAssigned = null;
-    public Action<IAssignableGameManager>? OnGameManagerAssigned { get; set; } = null;
+    public event IAssignableBehaviourController.OnBehaviourControllerAssignedDelegate? OnBehaviourControllerAssigned = null;
 
-    public Action<IEntity>? OnNameChanged { get; set; } = null;
+    public event INameable.OnNameChangedDelegate? OnNameChanged = null;
 
-    public Action<IGameObject>? OnUpdated { get; set; } = null;
+    public event IGameObject.OnUpdatedDelegate? OnUpdated = null;
 
 
     private ITransform _transform = null!;
@@ -35,8 +33,9 @@ public class GameObject : BaseEntity, IGameObject
         {
             if (value == _name) return;
 
+            string previousName = _name;
             _name = value;
-            OnNameChanged?.Invoke(this);
+            OnNameChanged?.Invoke(this, previousName);
         }
     }
 
@@ -107,6 +106,7 @@ public class GameObject : BaseEntity, IGameObject
     }
 
     public GameObject() { OnBehaviourControllerAssigned += ConnectBehaviourController; }
+
     private void ConnectBehaviourController(IAssignableBehaviourController controller)
     {
         controller.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;

Engine.Core/StateEnable.cs

@@ -1,14 +1,12 @@
-using System;
-
 using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Core;
 
 public class StateEnable : IStateEnable
 {
-    public Action<IAssignable>? OnUnassigned { get; set; } = null;
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
-    public Action<IAssignableEntity>? OnEntityAssigned { get; set; } = null;
+    public event IAssignableEntity.OnEntityAssignedDelegate? OnEntityAssigned = null;
-    public Action<IStateEnable>? OnEnabledChanged { get; set; } = null;
+    public event IStateEnable.OnNameChangedDelegate? OnEnabledChanged = null;
 
     private bool _enabled = true;
     private IEntity _entity = null!;
@@ -23,8 +21,9 @@ public class StateEnable : IStateEnable
             if (value == _enabled)
                 return;
 
+            bool previousState = _enabled;
             _enabled = value;
-            OnEnabledChanged?.Invoke(this);
+            OnEnabledChanged?.Invoke(this, previousState);
         }
     }
 

Engine.Core/Transform.cs

@@ -1,20 +1,41 @@
-using System;
+using System.Collections;
+using System.Collections.Generic;
 
 using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Core;
 
-[System.Diagnostics.DebuggerDisplay("Position: {Position.ToString(), nq}, Scale: {Scale.ToString(), nq}, Rotation: {Rotation}")]
+[System.Diagnostics.DebuggerDisplay("Name: {GameObject.Name, nq} Position: {Position.ToString(), nq}, Scale: {Scale.ToString(), nq}, Rotation: {Rotation}")]
 public class Transform : ITransform
 {
-    public Action<ITransform>? OnPositionChanged { get; set; } = null;
+    public event IAssignableGameObject.OnGameObjectAssignedDelegate? OnGameObjectAssigned = null;
-    public Action<ITransform>? OnScaleChanged { get; set; } = null;
+
-    public Action<ITransform>? OnRotationChanged { get; set; } = null;
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
+
+    public event ITransform.OnPositionChangedDelegate? OnPositionChanged = null;
+    public event ITransform.OnScaleChangedDelegate? OnScaleChanged = null;
+    public event ITransform.OnRotationChangedDelegate? OnRotationChanged = null;
+
+    public event ITransform.OnParentChangedDelegate? OnParentChanged = null;
+    public event ITransform.OnChildrenAddedDelegate? OnChildrenAdded = null;
+    public event ITransform.OnChildrenRemovedDelegate? OnChildrenRemoved = null;
+
 
     private Vector2D _position = Vector2D.Zero;
     private Vector2D _scale = Vector2D.One;
     private float _rotation = 0f;
 
+    private Vector2D _localPosition = Vector2D.Zero;
+    private Vector2D _localScale = Vector2D.One;
+    private float _localRotation = 0f;
+
+    private readonly List<ITransform> _children = [];
+
+    public IGameObject GameObject { get; private set; } = null!;
+    public ITransform? Parent { get; private set; } = null;
+
+    public IReadOnlyList<ITransform> Children => _children;
+
     public Vector2D Position
     {
         get => _position;
@@ -24,6 +45,7 @@ public class Transform : ITransform
                 return;
 
             _position = value;
+            UpdateLocalPosition();
             OnPositionChanged?.Invoke(this);
         }
     }
@@ -37,6 +59,7 @@ public class Transform : ITransform
                 return;
 
             _scale = value;
+            UpdateLocalScale();
             OnScaleChanged?.Invoke(this);
         }
     }
@@ -50,7 +73,210 @@ public class Transform : ITransform
                 return;
 
             _rotation = value;
+            UpdateLocalPosition();
             OnRotationChanged?.Invoke(this);
         }
     }
+
+    public Vector2D LocalPosition
+    {
+        get => _localPosition;
+        set
+        {
+            if (value == _localPosition)
+                return;
+
+            _localPosition = value;
+            UpdatePosition();
+            OnPositionChanged?.Invoke(this);
+        }
+    }
+
+    public Vector2D LocalScale
+    {
+        get => _localScale;
+        set
+        {
+            if (value == _localScale)
+                return;
+
+            _localScale = value;
+            UpdateScale();
+            OnScaleChanged?.Invoke(this);
+        }
+    }
+
+    public float LocalRotation
+    {
+        get => _localRotation;
+        set
+        {
+            if (value == _localRotation)
+                return;
+
+            _localRotation = value;
+            UpdateRotation();
+            OnRotationChanged?.Invoke(this);
+        }
+    }
+
+    public void SetParent(ITransform? transform)
+    {
+        if (transform == this || Parent == transform)
+            return;
+
+        ITransform? previousParent = Parent;
+        if (previousParent is not null)
+        {
+            previousParent.RemoveChild(this);
+            previousParent.OnPositionChanged -= RecalculatePosition;
+            previousParent.OnScaleChanged -= RecalculateScale;
+            previousParent.OnRotationChanged -= RecalculateRotation;
+            previousParent.OnParentChanged -= NotifyChildrenOnParentChange;
+        }
+
+        Parent = transform;
+
+        if (transform is not null)
+        {
+            transform.AddChild(this);
+            transform.OnPositionChanged += RecalculatePosition;
+            transform.OnScaleChanged += RecalculateScale;
+            transform.OnRotationChanged += RecalculateRotation;
+            transform.OnParentChanged += NotifyChildrenOnParentChange;
+        }
+
+        UpdateLocalPosition();
+        UpdateLocalScale();
+        UpdateLocalRotation();
+
+        OnParentChanged?.Invoke(this, previousParent);
+    }
+
+    public void AddChild(ITransform transform)
+    {
+        if (_children.Contains(transform))
+            return;
+
+        _children.Add(transform);
+        transform.SetParent(this);
+        OnChildrenAdded?.Invoke(this, transform);
+    }
+
+    public void RemoveChild(ITransform transform)
+    {
+        if (!_children.Remove(transform))
+            return;
+
+        transform.SetParent(null);
+        OnChildrenRemoved?.Invoke(this, transform);
+    }
+
+    public IEnumerator<ITransform> GetEnumerator() => _children.GetEnumerator();
+    IEnumerator IEnumerable.GetEnumerator() => _children.GetEnumerator();
+
+    private void NotifyChildrenOnParentChange(ITransform transform, ITransform? previousParent)
+    {
+        // TODO No idea how logical this is to propagate this to the children the way I'm doing right now.
+        // I was originally gonna just call `child.OnParentChanged?.Invoke(child, child.Parent);` but seems an unnecessary call too?
+        foreach (var child in Children) // TODO CHECK ERRORS
+            child.SetParent(this);
+    }
+
+    private void RecalculatePosition(ITransform _)
+    {
+        if (Parent is null)
+            return;
+
+        UpdatePosition();
+        OnPositionChanged?.Invoke(this);
+    }
+
+    private void RecalculateScale(ITransform _)
+    {
+        if (Parent is null)
+            return;
+
+        UpdateScale();
+        OnScaleChanged?.Invoke(this);
+    }
+
+    private void RecalculateRotation(ITransform _)
+    {
+        if (Parent is null)
+            return;
+
+        UpdatePosition();
+        UpdateRotation();
+        OnPositionChanged?.Invoke(this);
+        OnRotationChanged?.Invoke(this);
+    }
+
+    private void UpdateLocalPosition()
+    {
+        if (Parent is null)
+            _localPosition = Position;
+        else
+            _localPosition = Parent.Position.FromTo(Position).Scale(Parent.Scale);
+    }
+
+    private void UpdateLocalScale()
+    {
+        if (Parent is null)
+            _localScale = Scale;
+        else
+            _localScale = Scale.Scale(new(1f / Parent.Scale.X, 1f / Parent.Scale.Y));
+    }
+
+    private void UpdateLocalRotation()
+    {
+        if (Parent is null)
+            _localRotation = Rotation;
+        else
+            _localRotation = Rotation - Parent.Rotation;
+    }
+
+    private void UpdatePosition()
+    {
+        if (Parent is null)
+            _position = LocalPosition.Scale(Vector2D.One).Rotate(0f * Math.DegreeToRadian);
+        else
+            _position = Parent.Position + LocalPosition.Scale(new(1f / Parent.Scale.X, 1f / Parent.Scale.Y)).Rotate(Parent.Rotation * Math.DegreeToRadian);
+    }
+
+    private void UpdateScale()
+    {
+        if (Parent is null)
+            _scale = LocalScale;
+        else
+            _scale = Vector2D.Scale(Parent.Scale, LocalScale);
+    }
+
+    private void UpdateRotation()
+    {
+        if (Parent is null)
+            _rotation = LocalRotation;
+        else
+            _rotation = Parent.Rotation + LocalRotation;
+    }
+
+    public bool Assign(IGameObject gameObject)
+    {
+        if (GameObject is not null && GameObject.Initialized)
+            return false;
+
+        GameObject = gameObject;
+        OnGameObjectAssigned?.Invoke(this);
+        return true;
+    }
+
+    public bool Unassign()
+    {
+        if (GameObject is not null && GameObject.Initialized)
+            return false;
+
+        GameObject = null!;
+        OnUnassigned?.Invoke(this);
+        return true;
+    }
 }

Engine.Physics2D/Abstract/ICollider2D.cs

@@ -1,5 +1,3 @@
-using System;
-
 using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Physics2D.Abstract;
@@ -12,17 +10,17 @@ public interface ICollider2D : IBehaviour, IAssignableTransform
     /// <summary>
     /// Event triggered when a collision is detected.
     /// </summary>
-    Action<ICollider2D, CollisionDetectionInformation>? OnCollisionDetected { get; set; }
+    event OnCollisionDetectedDelegate? OnCollisionDetected;
 
     /// <summary>
     /// Event triggered when a collision is resolved.
     /// </summary>
-    Action<ICollider2D, CollisionDetectionInformation>? OnCollisionResolved { get; set; }
+    event OnCollisionResolvedDelegate? OnCollisionResolved;
 
     /// <summary>
     /// Event triggered when another <see cref="ICollider2D"/> triggers this <see cref="ICollider2D"/>.
     /// </summary>
-    Action<ICollider2D, ICollider2D>? OnTriggered { get; set; }
+    event OnTriggeredDelegate? OnTriggered;
 
     /// <summary>
     /// The <see cref="IRigidBody2D"/> associated with the <see cref="ICollider2D"/>.
@@ -38,4 +36,12 @@ public interface ICollider2D : IBehaviour, IAssignableTransform
     /// Recalculates <see cref="ICollider2D"/> properties.
     /// </summary>
     void Recalculate();
+
+    void Detect(CollisionDetectionInformation collisionDetectionInformation);
+    void Resolve(CollisionDetectionInformation collisionDetectionInformation);
+    void Trigger(ICollider2D initiator);
+
+    delegate void OnCollisionDetectedDelegate(ICollider2D sender, CollisionDetectionInformation collisionDetectionInformation);
+    delegate void OnCollisionResolvedDelegate(ICollider2D sender, CollisionDetectionInformation collisionDetectionInformation);
+    delegate void OnTriggeredDelegate(ICollider2D sender, ICollider2D initiatorCollider);
 }

Engine.Physics2D/Collider2DBehaviourBase.cs

@@ -1,5 +1,3 @@
-using System;
-
 using Syntriax.Engine.Core;
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Physics2D.Abstract;
@@ -8,9 +6,9 @@ namespace Syntriax.Engine.Physics2D;
 
 public abstract class Collider2DBehaviourBase : BehaviourOverride, ICollider2D
 {
-    public Action<ICollider2D, CollisionDetectionInformation>? OnCollisionDetected { get; set; } = null;
+    public event ICollider2D.OnCollisionDetectedDelegate? OnCollisionDetected = null;
-    public Action<ICollider2D, CollisionDetectionInformation>? OnCollisionResolved { get; set; } = null;
+    public event ICollider2D.OnCollisionResolvedDelegate? OnCollisionResolved = null;
-    public Action<ICollider2D, ICollider2D>? OnTriggered { get; set; } = null;
+    public event ICollider2D.OnTriggeredDelegate? OnTriggered = null;
 
 
     protected bool NeedsRecalculation { get; private set; } = true;
@@ -20,7 +18,7 @@ public abstract class Collider2DBehaviourBase : BehaviourOverride, ICollider2D
     public bool IsTrigger { get; set; } = false;
 
     ITransform IAssignableTransform.Transform => Transform;
-    Action<IAssignableTransform>? IAssignableTransform.OnTransformAssigned { get => GameObject.OnTransformAssigned; set => GameObject.OnTransformAssigned = value; }
+    public event IAssignableTransform.OnTransformAssignedDelegate? OnTransformAssigned { add => GameObject.OnTransformAssigned += value; remove => GameObject.OnTransformAssigned -= value; }
 
     bool IAssignableTransform.Assign(ITransform transform) => GameObject.Assign(transform);
 
@@ -37,7 +35,7 @@ public abstract class Collider2DBehaviourBase : BehaviourOverride, ICollider2D
 
     protected override void OnInitialize()
     {
-        BehaviourController.TryGetBehaviour(out _rigidBody2D);
+        BehaviourController.TryGetBehaviourInParent(out _rigidBody2D);
 
         BehaviourController.OnBehaviourAdded += OnBehaviourAddedToController;
         BehaviourController.OnBehaviourRemoved += OnBehaviourRemovedFromController;
@@ -45,6 +43,12 @@ public abstract class Collider2DBehaviourBase : BehaviourOverride, ICollider2D
         Transform.OnPositionChanged += SetNeedsRecalculation;
         Transform.OnRotationChanged += SetNeedsRecalculation;
         Transform.OnScaleChanged += SetNeedsRecalculation;
+        Transform.OnParentChanged += UpdateRigidBody2D;
+    }
+
+    private void UpdateRigidBody2D(ITransform _1, ITransform? _2)
+    {
+        BehaviourController.TryGetBehaviourInParent(out _rigidBody2D);
     }
 
     private void OnBehaviourAddedToController(IBehaviourController _, IBehaviour behaviour)
@@ -70,4 +74,8 @@ public abstract class Collider2DBehaviourBase : BehaviourOverride, ICollider2D
         Transform.OnPositionChanged -= SetNeedsRecalculation;
         Transform.OnRotationChanged -= SetNeedsRecalculation;
     }
+
+    public void Detect(CollisionDetectionInformation collisionDetectionInformation) => OnCollisionDetected?.Invoke(this, collisionDetectionInformation);
+    public void Resolve(CollisionDetectionInformation collisionDetectionInformation) => OnCollisionResolved?.Invoke(this, collisionDetectionInformation);
+    public void Trigger(ICollider2D initiator) => OnTriggered?.Invoke(this, initiator);
 }

Engine.Physics2D/CollisionResolver2D.cs

@@ -38,7 +38,7 @@ public class CollisionResolver2D : ICollisionResolver2D
         left.Recalculate();
         right.Recalculate();
 
-        left.OnCollisionResolved?.Invoke(collisionInformation.Left, collisionInformation);
+        left.Resolve(collisionInformation);
-        right.OnCollisionResolved?.Invoke(right, collisionInformation);
+        right.Resolve(collisionInformation);
     }
 }

Engine.Physics2D/Physics2D.cs

@@ -1,13 +1,33 @@
-using System;
-
 using Syntriax.Engine.Core;
-using Syntriax.Engine.Physics2D;
 using Syntriax.Engine.Physics2D.Primitives;
 
 namespace Engine.Physics2D;
 
 public static partial class Physics2D
 {
+    public static bool Overlaps(this Shape shape, Vector2D point) => Overlaps(shape, point, out var _);
+    public static bool Overlaps(this Shape shape, Vector2D point, out float depth)
+    {
+        depth = float.MaxValue;
+        var vertices = shape.Vertices;
+        int count = vertices.Count;
+
+        for (int indexProjection = 0; indexProjection < count; indexProjection++)
+        {
+            Vector2D projectionVector = vertices[indexProjection].FromTo(vertices[(indexProjection + 1) % count]).Perpendicular().Normalized;
+
+            Projection shapeProjection = shape.ToProjection(projectionVector);
+            float projectedPoint = point.Dot(projectionVector);
+
+            if (shapeProjection.Max < projectedPoint || shapeProjection.Min > projectedPoint)
+                return false;
+
+            depth = Math.Min(depth, Math.Abs(Math.AbsMin(shapeProjection.Max - projectedPoint, shapeProjection.Min - projectedPoint)));
+        }
+
+        return true;
+    }
+
     public static bool Overlaps(this Circle left, Circle right)
     {
         float distanceSquared = left.Center.FromTo(right.Center).LengthSquared();
@@ -27,7 +47,7 @@ public static partial class Physics2D
         normal = distanceVector.Normalized;
 
         if (isOverlapping)
-            depth = MathF.Sqrt(radiusSumSquared - distanceSquared);
+            depth = Math.Sqrt(radiusSumSquared - distanceSquared);
 
         return isOverlapping;
     }
@@ -44,7 +64,7 @@ public static partial class Physics2D
         normal = distanceVector.Normalized;
 
         if (isOverlapping)
-            depth = MathF.Sqrt(radiusSquared - distanceSquared);
+            depth = Math.Sqrt(radiusSquared - distanceSquared);
 
         return isOverlapping;
     }

Engine.Physics2D/PhysicsEngine2D.cs

@@ -80,17 +80,17 @@ public class PhysicsEngine2D : IPhysicsEngine2D
                     {
                         if (colliderX.IsTrigger)
                         {
-                            colliderX.OnTriggered?.Invoke(colliderX, colliderY);
+                            colliderX.Trigger(colliderY);
                             continue;
                         }
                         else if (colliderY.IsTrigger)
                         {
-                            colliderY.OnTriggered?.Invoke(colliderY, colliderY);
+                            colliderY.Trigger(colliderY);
                             continue;
                         }
 
-                        colliderX.OnCollisionDetected?.Invoke(colliderX, information);
+                        colliderX.Detect(information);
-                        colliderY.OnCollisionDetected?.Invoke(colliderY, information);
+                        colliderY.Detect(information);
 
                         collisionResolver?.Resolve(information);
                     }

Engine.Physics2D/PhysicsEngine2DCollector.cs

@@ -1,15 +1,13 @@
-using System;
-
 using Syntriax.Engine.Core;
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Physics2D.Abstract;
 
 namespace Syntriax.Engine.Physics2D;
 
-public class PhysicsEngine2DCacher : IPhysicsEngine2D, IAssignableGameManager
+public class PhysicsEngine2DCollector : IPhysicsEngine2D, IAssignableGameManager
 {
-    public Action<IAssignable>? OnUnassigned { get; set; } = null;
+    public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
-    public Action<IAssignableGameManager>? OnGameManagerAssigned { get; set; } = null;
+    public event IAssignableGameManager.OnGameManagerAssignedDelegate? OnGameManagerAssigned = null;
 
 
     private int _iterationPerStep = 1;
@@ -17,8 +15,8 @@ public class PhysicsEngine2DCacher : IPhysicsEngine2D, IAssignableGameManager
     protected readonly ICollisionDetector2D collisionDetector = null!;
     protected readonly ICollisionResolver2D collisionResolver = null!;
 
-    protected BehaviourCacher<IRigidBody2D> rigidBodyCacher = new();
+    protected BehaviourCollector<IRigidBody2D> rigidBodyCollector = new();
-    protected BehaviourCacher<ICollider2D> colliderCacher = new();
+    protected BehaviourCollector<ICollider2D> colliderCollector = new();
 
 
     public int IterationPerStep { get => _iterationPerStep; set => _iterationPerStep = value < 1 ? 1 : value; }
@@ -31,23 +29,23 @@ public class PhysicsEngine2DCacher : IPhysicsEngine2D, IAssignableGameManager
         for (int iterationIndex = 0; iterationIndex < IterationPerStep; iterationIndex++)
         {
             // Can Parallel
-            foreach (var rigidBody in rigidBodyCacher)
+            foreach (var rigidBody in rigidBodyCollector)
                 StepRigidBody(rigidBody, intervalDeltaTime);
 
             // Can Parallel
-            foreach (var collider in colliderCacher)
+            foreach (var collider in colliderCollector)
                 collider.Recalculate();
 
             // Can Parallel
-            for (int x = 0; x < colliderCacher.Behaviours.Count; x++)
+            for (int x = 0; x < colliderCollector.Behaviours.Count; x++)
             {
-                ICollider2D? colliderX = colliderCacher.Behaviours[x];
+                ICollider2D? colliderX = colliderCollector.Behaviours[x];
                 if (!colliderX.IsActive)
                     return;
 
-                for (int y = x + 1; y < colliderCacher.Behaviours.Count; y++)
+                for (int y = x + 1; y < colliderCollector.Behaviours.Count; y++)
                 {
-                    ICollider2D? colliderY = colliderCacher.Behaviours[y];
+                    ICollider2D? colliderY = colliderCollector.Behaviours[y];
 
                     if (!colliderY.IsActive)
                         return;
@@ -67,17 +65,17 @@ public class PhysicsEngine2DCacher : IPhysicsEngine2D, IAssignableGameManager
                     {
                         if (colliderX.IsTrigger)
                         {
-                            colliderX.OnTriggered?.Invoke(colliderX, colliderY);
+                            colliderX.Trigger(colliderY);
                             continue;
                         }
                         else if (colliderY.IsTrigger)
                         {
-                            colliderY.OnTriggered?.Invoke(colliderY, colliderY);
+                            colliderY.Trigger(colliderY);
                             continue;
                         }
 
-                        colliderX.OnCollisionDetected?.Invoke(colliderX, information);
+                        colliderX.Detect(information);
-                        colliderY.OnCollisionDetected?.Invoke(colliderY, information);
+                        colliderY.Detect(information);
 
                         collisionResolver?.Resolve(information);
                     }
@@ -100,8 +98,8 @@ public class PhysicsEngine2DCacher : IPhysicsEngine2D, IAssignableGameManager
         if (GameManager is not null)
             return false;
 
-        colliderCacher.Assign(gameManager);
+        colliderCollector.Assign(gameManager);
-        rigidBodyCacher.Assign(gameManager);
+        rigidBodyCollector.Assign(gameManager);
 
         GameManager = gameManager;
         OnGameManagerAssigned?.Invoke(this);
@@ -114,35 +112,35 @@ public class PhysicsEngine2DCacher : IPhysicsEngine2D, IAssignableGameManager
         if (GameManager is null)
             return false;
 
-        colliderCacher.Unassign();
+        colliderCollector.Unassign();
-        rigidBodyCacher.Unassign();
+        rigidBodyCollector.Unassign();
 
         GameManager = null!;
         OnUnassigned?.Invoke(this);
         return true;
     }
 
-    public PhysicsEngine2DCacher()
+    public PhysicsEngine2DCollector()
     {
         collisionDetector = new CollisionDetector2D();
         collisionResolver = new CollisionResolver2D();
     }
 
-    public PhysicsEngine2DCacher(IGameManager gameManager)
+    public PhysicsEngine2DCollector(IGameManager gameManager)
     {
         Assign(gameManager);
         collisionDetector = new CollisionDetector2D();
         collisionResolver = new CollisionResolver2D();
     }
 
-    public PhysicsEngine2DCacher(IGameManager gameManager, ICollisionDetector2D collisionDetector, ICollisionResolver2D collisionResolver)
+    public PhysicsEngine2DCollector(IGameManager gameManager, ICollisionDetector2D collisionDetector, ICollisionResolver2D collisionResolver)
     {
         Assign(gameManager);
         this.collisionDetector = collisionDetector;
         this.collisionResolver = collisionResolver;
     }
 
-    public PhysicsEngine2DCacher(ICollisionDetector2D collisionDetector, ICollisionResolver2D collisionResolver)
+    public PhysicsEngine2DCollector(ICollisionDetector2D collisionDetector, ICollisionResolver2D collisionResolver)
     {
         this.collisionDetector = collisionDetector;
         this.collisionResolver = collisionResolver;

Engine.Physics2D/RigidBody2D.cs

@@ -1,5 +1,3 @@
-using System;
-
 using Syntriax.Engine.Core;
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Physics2D.Abstract;
@@ -8,7 +6,7 @@ namespace Syntriax.Engine.Physics2D;
 
 public class RigidBody2D : BehaviourOverride, IRigidBody2D
 {
-    public Action<IAssignableTransform>? OnTransformAssigned { get => GameObject.OnTransformAssigned; set => GameObject.OnTransformAssigned = value; }
+    event IAssignableTransform.OnTransformAssignedDelegate? IAssignableTransform.OnTransformAssigned { add => GameObject.OnTransformAssigned += value; remove => GameObject.OnTransformAssigned -= value; }
 
     private const float LOWEST_ALLOWED_MASS = 0.00001f;
     private float _mass = 1f;