fix: ticker behaviour working unexpectedly on instances where time increment is bigger than the period

Engine.Core/Abstract/IGameManager.cs

@@ -8,14 +8,19 @@ namespace Syntriax.Engine.Core.Abstract;
 public interface IGameManager : IEntity, IEnumerable<IHierarchyObject>
 {
     /// <summary>
-    /// Event triggered when <see cref="Update(double)"/> is called on the <see cref="IGameManager"/>.
+    /// Event triggered when <see cref="Update(EngineTime)"/> is about to be called called on the <see cref="IGameManager"/>.
+    /// </summary>
+    event UpdateEventHandler? OnPreUpdate;
+
+    /// <summary>
+    /// Event triggered when <see cref="Update(EngineTime)"/> is called on the <see cref="IGameManager"/>.
     /// </summary>
     event UpdateEventHandler? OnUpdate;
 
     /// <summary>
     /// Event triggered when <see cref="PreDraw"/> is called on the <see cref="IGameManager"/>.
     /// </summary>
-    event PreDawEventHandler? OnPreDraw;
+    event PreDrawEventHandler? OnPreDraw;
 
     /// <summary>
     /// Event triggered when a <see cref="IHierarchyObject"/> is registered to the <see cref="IGameManager"/>.
@@ -27,11 +32,21 @@ public interface IGameManager : IEntity, IEnumerable<IHierarchyObject>
     /// </summary>
     event HierarchyObjectUnRegisteredEventHandler? OnHierarchyObjectUnRegistered;
 
+    /// <summary>
+    /// Current time scale the <see cref="IGameManager"/> operates on.
+    /// </summary>
+    float TimeScale { get; set; }
+
     /// <summary>
     /// Contains time data related to this <see cref="IGameManager"/>.
     /// </summary>
     EngineTime Time { get; }
 
+    /// <summary>
+    /// Contains unscaled time data related to this <see cref="IGameManager"/>.
+    /// </summary>
+    EngineTime UnscaledTime { get; }
+
     /// <summary>
     /// Gets a read-only list of <see cref="IHierarchyObject"/>s managed by the <see cref="IGameManager"/>.
     /// </summary>
@@ -69,7 +84,7 @@ public interface IGameManager : IEntity, IEnumerable<IHierarchyObject>
     void PreDraw();
 
     delegate void UpdateEventHandler(IGameManager sender, EngineTime engineTime);
-    delegate void PreDawEventHandler(IGameManager sender);
+    delegate void PreDrawEventHandler(IGameManager sender);
 
     delegate void HierarchyObjectRegisteredEventHandler(IGameManager sender, IHierarchyObject hierarchyObjectRegistered);
     delegate void HierarchyObjectUnRegisteredEventHandler(IGameManager sender, IHierarchyObject hierarchyObjectUnregistered);

Engine.Core/ActiveBehaviourCollectorSorted.cs

@@ -6,7 +6,18 @@ namespace Syntriax.Engine.Core;
 
 public class ActiveBehaviourCollectorSorted<T> : ActiveBehaviourCollector<T> where T : class, IBehaviour
 {
-    public Comparison<T>? SortBy { get; set; } = null;
+    private Comparison<T>? _sortBy = null;
+    public Comparison<T>? SortBy
+    {
+        get => _sortBy;
+        set
+        {
+            _sortBy = value;
+
+            if (value is not null)
+                activeBehaviours.Sort(value);
+        }
+    }
 
     protected override void OnBehaviourAdd(IBehaviour behaviour)
     {
@@ -15,5 +26,5 @@ public class ActiveBehaviourCollectorSorted<T> : ActiveBehaviourCollector<T> whe
     }
 
     public ActiveBehaviourCollectorSorted() { }
-    public ActiveBehaviourCollectorSorted(IGameManager gameManager) : base(gameManager) { }
+    public ActiveBehaviourCollectorSorted(IGameManager gameManager, Comparison<T> sortBy) : base(gameManager) => SortBy = sortBy;
 }

Engine.Core/BehaviourCollectorSorted.cs

@@ -6,7 +6,18 @@ namespace Syntriax.Engine.Core;
 
 public class BehaviourCollectorSorted<T> : BehaviourCollector<T> where T : class
 {
-    public Comparison<T>? SortBy { get; set; } = null;
+    private Comparison<T>? _sortBy = null;
+    public Comparison<T>? SortBy
+    {
+        get => _sortBy;
+        set
+        {
+            _sortBy = value;
+
+            if (value is not null)
+                behaviours.Sort(value);
+        }
+    }
 
     protected override void OnBehaviourAdd(IBehaviour behaviour)
     {
@@ -15,5 +26,5 @@ public class BehaviourCollectorSorted<T> : BehaviourCollector<T> where T : class
     }
 
     public BehaviourCollectorSorted() { }
-    public BehaviourCollectorSorted(IGameManager gameManager) : base(gameManager) { }
+    public BehaviourCollectorSorted(IGameManager gameManager, Comparison<T> sortBy) : base(gameManager) => SortBy = sortBy;
 }

Engine.Core/Extensions/Abstract/TransformExtensions.cs

@@ -1,9 +0,0 @@
-namespace Syntriax.Engine.Core.Abstract;
-
-public static class TransformExtensions
-{
-    public static Vector2D TransformVector2D(this ITransform2D transform, Vector2D vector)
-        => vector.Scale(transform.Scale)
-                 .Rotate(transform.Rotation * Math.DegreeToRadian)
-                 .Add(transform.Position);
-}

Engine.Core/Extensions/BehaviourControllerExtensions.cs

@@ -54,7 +54,7 @@ public static class BehaviourControllerExtensions
 
         while (controller is not null)
         {
-            if (behaviourController.GetBehaviour<T>() is T behaviour)
+            if (controller.GetBehaviour<T>() is T behaviour)
                 return behaviour;
 
             controller = controller.HierarchyObject.Parent?.BehaviourController;

Engine.Core/Extensions/HierarchyObjectExtensions.cs

@@ -7,9 +7,12 @@ namespace Syntriax.Engine.Core;
 
 public static class HierarchyObjectExtensions
 {
-    public static IHierarchyObject SetHierarchyObject(this IHierarchyObject hierarchyObject, string name)
+    public static T SetHierarchyObject<T>(this T hierarchyObject, string? name = "", IHierarchyObject? parent = null) where T : IHierarchyObject
     {
-        hierarchyObject.Name = name;
+        if (!string.IsNullOrWhiteSpace(name))
+            hierarchyObject.Name = name;
+        if (parent is not null)
+            hierarchyObject.SetParent(parent);
         return hierarchyObject;
     }
 

Engine.Core/Factory/HierarchyObjectFactory.cs

@@ -5,9 +5,11 @@ namespace Syntriax.Engine.Core.Factory;
 
 public class HierarchyObjectFactory
 {
+    public static IHierarchyObject Instantiate() => Instantiate<HierarchyObject>();
     public static T Instantiate<T>(params object?[]? args) where T : class, IHierarchyObject
         => Instantiate<T>(behaviourController: null, stateEnable: null, args);
 
+    public static IHierarchyObject Instantiate(IBehaviourController? behaviourController = null, IStateEnable? stateEnable = null) => Instantiate<HierarchyObject>(behaviourController, stateEnable);
     public static T Instantiate<T>(
         IBehaviourController? behaviourController = null,
         IStateEnable? stateEnable = null,

Engine.Core/GameManager.cs

@@ -10,13 +10,15 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("HierarchyObject Count: {_hierarchyObjects.Count}")]
 public class GameManager : BaseEntity, IGameManager
 {
+    public event IGameManager.UpdateEventHandler? OnPreUpdate = null;
     public event IGameManager.UpdateEventHandler? OnUpdate = null;
-    public event IGameManager.PreDawEventHandler? OnPreDraw = null;
+    public event IGameManager.PreDrawEventHandler? OnPreDraw = null;
 
     public event IGameManager.HierarchyObjectRegisteredEventHandler? OnHierarchyObjectRegistered = null;
     public event IGameManager.HierarchyObjectUnRegisteredEventHandler? OnHierarchyObjectUnRegistered = null;
 
     private readonly List<IHierarchyObject> _hierarchyObjects = new(Constants.GAME_OBJECTS_SIZE_INITIAL);
+    private float _timeScale = 1f;
 
     public IReadOnlyList<IHierarchyObject> HierarchyObjects => _hierarchyObjects;
 
@@ -36,6 +38,12 @@ public class GameManager : BaseEntity, IGameManager
     }
 
     public EngineTime Time { get; private set; } = new();
+    public EngineTime UnscaledTime { get; private set; } = new();
+    public float TimeScale
+    {
+        get => _timeScale;
+        set => _timeScale = value.Max(0f);
+    }
 
     public void Register(IHierarchyObject hierarchyObject)
     {
@@ -48,8 +56,8 @@ public class GameManager : BaseEntity, IGameManager
         if (!hierarchyObject.Initialize())
             throw new Exception($"{hierarchyObject.Name} can't be initialized");
 
-        foreach (IHierarchyObject child in hierarchyObject.Children)
-            Register(child);
+        for (int i = 0; i < hierarchyObject.Children.Count; i++)
+            Register(hierarchyObject.Children[i]);
 
         _hierarchyObjects.Add(hierarchyObject);
 
@@ -67,6 +75,12 @@ public class GameManager : BaseEntity, IGameManager
     }
 
     public void Remove(IHierarchyObject hierarchyObject)
+    {
+        hierarchyObject.SetParent(null);
+        RemoveIncursive(hierarchyObject);
+    }
+
+    private void RemoveIncursive(IHierarchyObject hierarchyObject)
     {
         if (!_hierarchyObjects.Contains(hierarchyObject))
             throw new Exception($"{nameof(IHierarchyObject)} named {hierarchyObject.Name} is not registered to the {nameof(GameManager)}.");
@@ -74,8 +88,8 @@ public class GameManager : BaseEntity, IGameManager
         hierarchyObject.OnFinalized -= OnHierarchyObjectFinalize;
         hierarchyObject.OnExitedHierarchy -= OnHierarchyObjectExitedHierarchy;
 
-        foreach (IHierarchyObject child in hierarchyObject.Children)
-            Remove(child);
+        for (int i = hierarchyObject.Children.Count - 1; i >= 0; i--)
+            Remove(hierarchyObject.Children[i]);
 
         _hierarchyObjects.Remove(hierarchyObject);
 
@@ -106,12 +120,15 @@ public class GameManager : BaseEntity, IGameManager
 
     public void Update(EngineTime engineTime)
     {
-        Time = engineTime;
+        UnscaledTime = engineTime;
+        Time = new(TimeSpan.FromTicks((long)(Time.TimeSinceStart.Ticks + engineTime.DeltaSpan.Ticks * TimeScale)), TimeSpan.FromTicks((long)(engineTime.DeltaSpan.Ticks * TimeScale)));
+
+        OnPreUpdate?.Invoke(this, Time);
 
         for (int i = 0; i < HierarchyObjects.Count; i++)
             HierarchyObjects[i].BehaviourController.Update();
 
-        OnUpdate?.Invoke(this, engineTime);
+        OnUpdate?.Invoke(this, Time);
     }
 
     public void PreDraw()

Engine.Core/HierarchyObject.cs

@@ -62,15 +62,18 @@ public class HierarchyObject : BaseEntity, IHierarchyObject
         if (!IsInHierarchy || _gameManager is not IGameManager gameManager)
             return false;
 
-        _gameManager = null!;
         OnExitingHierarchy(gameManager);
+        _gameManager = null!;
         OnExitedHierarchy?.Invoke(this, gameManager);
         return true;
     }
 
     public void SetParent(IHierarchyObject? parent)
     {
-        if (parent == this || Parent == parent)
+        if (parent == this)
+            throw new Exceptions.AssignException($"{Name} can not parent itself");
+
+        if (Parent == parent)
             return;
 
         IHierarchyObject? previousParent = Parent;
@@ -84,6 +87,9 @@ public class HierarchyObject : BaseEntity, IHierarchyObject
 
         if (parent is not null)
         {
+            if (parent.IsInHierarchy && !IsInHierarchy)
+                parent.GameManager.Register(this);
+
             parent.AddChild(this);
             parent.OnActiveChanged += OnParentActiveChanged;
         }
@@ -102,13 +108,13 @@ public class HierarchyObject : BaseEntity, IHierarchyObject
         OnChildrenAdded?.Invoke(this, parent);
     }
 
-    public void RemoveChild(IHierarchyObject parent)
+    public void RemoveChild(IHierarchyObject child)
     {
-        if (!_children.Remove(parent))
+        if (!_children.Remove(child))
             return;
 
-        parent.SetParent(null);
-        OnChildrenRemoved?.Invoke(this, parent);
+        child.SetParent(null);
+        OnChildrenRemoved?.Invoke(this, child);
     }
 
     protected virtual void OnAssign(IBehaviourController behaviourController) { }

Engine.Core/Primitives/Circle.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics;
+
 using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Core;
@@ -66,8 +67,8 @@ public readonly struct Circle(Vector2D center, float radius)
     /// <summary>
     /// Transforms the <see cref="Circle"/> by the specified <see cref="ITransform2D"/>.
     /// </summary>
-    public static Circle TransformCircle(ITransform2D transform, Circle circle)
-        => new(transform.TransformVector2D(circle.Center), circle.Radius * (transform.Scale.Magnitude / Vector2D.One.Magnitude));
+    public static Circle Transform(ITransform2D transform, Circle circle)
+        => new(transform.Transform(circle.Center), circle.Radius * (transform.Scale.Magnitude / Vector2D.One.Magnitude));
 
     /// <summary>
     /// Checks if two <see cref="Circle"/>s are approximately equal.
@@ -97,8 +98,11 @@ public static class CircleExtensions
     /// <inheritdoc cref="Circle.Project(Circle, Vector2D)" />
     public static Projection1D ToProjection(this Circle circle, Vector2D projectionVector) => Circle.Project(circle, projectionVector);
 
-    /// <inheritdoc cref="Circle.TransformCircle(ITransform2D, Circle)" />
-    public static Circle TransformCircle(this ITransform2D transform, Circle circle) => Circle.TransformCircle(transform, circle);
+    /// <inheritdoc cref="Circle.Transform(ITransform2D, Circle)" />
+    public static Circle Transform(this ITransform2D transform, Circle circle) => Circle.Transform(transform, circle);
+
+    /// <inheritdoc cref="Circle.Transform(ITransform2D, Circle)" />
+    public static Circle Transform(this Circle circle, ITransform2D transform) => Circle.Transform(transform, circle);
 
     /// <inheritdoc cref="Circle.ApproximatelyEquals(Circle, Circle, float)" />
     public static bool ApproximatelyEquals(this Circle left, Circle right, float epsilon = float.Epsilon) => Circle.ApproximatelyEquals(left, right, epsilon);

Engine.Core/Primitives/Shape2D.cs

@@ -1,5 +1,6 @@
 using System.Collections;
 using System.Collections.Generic;
+
 using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Core;
@@ -9,20 +10,20 @@ namespace Syntriax.Engine.Core;
 /// </summary>
 /// <param name="vertices">The vertices of the shape.</param>
 /// <remarks>
-/// Initializes a new instance of the <see cref="Shape2D"/> struct with the specified vertices.
+/// Initializes a new instance of a <see cref="Shape2D"/> struct with the specified vertices.
 /// </remarks>
 [System.Diagnostics.DebuggerDisplay("Vertices Count: {Vertices.Count}")]
 public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
 {
     public static readonly Shape2D Triangle = CreateNgon(3, Vector2D.Up);
-    public static readonly Shape2D Box = CreateNgon(4, Vector2D.One);
+    public static readonly Shape2D Square = CreateNgon(4, Vector2D.One);
     public static readonly Shape2D Pentagon = CreateNgon(5, Vector2D.Up);
     public static readonly Shape2D Hexagon = CreateNgon(6, Vector2D.Right);
 
     private readonly List<Vector2D> _verticesList = vertices;
 
     /// <summary>
-    /// Gets the vertices of the shape.
+    /// Gets the vertices of the <see cref="Shape2D"/>.
     /// </summary>
     public IReadOnlyList<Vector2D> Vertices => _verticesList;
 
@@ -34,10 +35,10 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     public Vector2D this[System.Index index] => Vertices[index];
 
     /// <summary>
-    /// Returns a copy of the current shape.
+    /// Returns a copy of the current <see cref="Shape2D"/>.
     /// </summary>
-    /// <param name="shape">The shape to copy.</param>
-    /// <returns>A copy of the input shape.</returns>
+    /// <param name="shape">The <see cref="Shape2D"/> to copy.</param>
+    /// <returns>A copy of the input <see cref="Shape2D"/>.</returns>
     public static Shape2D CreateCopy(Shape2D shape) => new(new List<Vector2D>(shape.Vertices));
 
     /// <summary>
@@ -69,10 +70,10 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     }
 
     /// <summary>
-    /// Gets the super triangle that encloses the given shape.
+    /// Gets the super triangle that encloses the given <see cref="Shape2D"/>.
     /// </summary>
-    /// <param name="shape">The shape to enclose.</param>
-    /// <returns>The super triangle that encloses the given shape.</returns>
+    /// <param name="shape">The <see cref="Shape2D"/> to enclose.</param>
+    /// <returns>The super triangle that encloses the given <see cref="Shape2D"/>.</returns>
     public static Triangle GetSuperTriangle(Shape2D shape)
     {
         float minX = float.MaxValue, minY = float.MaxValue;
@@ -100,10 +101,35 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     }
 
     /// <summary>
-    /// Gets the lines that form the edges of the shape.
+    /// Triangulates the given convex <see cref="Shape2D"/>.
     /// </summary>
-    /// <param name="shape">The shape to get lines from.</param>
-    /// <param name="lines">The list to populate with lines.</param>
+    /// <param name="shape">The <see cref="Shape2D"/> to triangulate.</param>
+    /// <param name="triangles">The list to populate with triangles.</param>
+    public static void TriangulateConvex(Shape2D shape, IList<Triangle> triangles)
+    {
+        triangles.Clear();
+
+        for (int i = 2; i < shape.Vertices.Count; i++)
+            triangles.Add(new Triangle(shape[0], shape[i - 1], shape[i]));
+    }
+
+    /// <summary>
+    /// Triangulates the given convex <see cref="Shape2D"/>.
+    /// </summary>
+    /// <param name="shape">The <see cref="Shape2D"/> to triangulate.</param>
+    /// <returns>A list of <see cref="Triangle"/>s that makes up the given convex <see cref="Shape2D"/>.</returns>
+    public static List<Triangle> TriangulateConvex(Shape2D shape)
+    {
+        List<Triangle> triangles = new(shape.Vertices.Count - 2);
+        TriangulateConvex(shape, triangles);
+        return triangles;
+    }
+
+    /// <summary>
+    /// Gets the <see cref="Line2D"/>s that form the edges of the <see cref="Shape2D"/>.
+    /// </summary>
+    /// <param name="shape">The <see cref="Shape2D"/> to get <see cref="Line2D"/>s from.</param>
+    /// <param name="lines">The list to populate with <see cref="Line2D"/>.</sparam>
     public static void GetLines(Shape2D shape, IList<Line2D> lines)
     {
         lines.Clear();
@@ -113,10 +139,10 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     }
 
     /// <summary>
-    /// Gets a list of lines that form the edges of the shape.
+    /// Gets a list of <see cref="Line2D"/>s that form the edges of the <see cref="Shape2D"/>.
     /// </summary>
-    /// <param name="shape">The shape to get lines from.</param>
-    /// <returns>A list of lines that form the edges of the shape.</returns>
+    /// <param name="shape">The shape to get <see cref="Line2D"/>s from.</param>
+    /// <returns>A list of <see cref="Line2D"/>s that form the edges of the <see cref="Shape2D"/>.</returns>
     public static List<Line2D> GetLines(Shape2D shape)
     {
         List<Line2D> lines = new(shape.Vertices.Count - 1);
@@ -125,7 +151,7 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     }
 
     /// <summary>
-    /// Projects the shape onto a vector.
+    /// Projects the <see cref="Shape2D"/> onto a 1D plane.
     /// </summary>
     /// <param name="shape">The shape to project.</param>
     /// <param name="projectionVector">The vector to project onto.</param>
@@ -140,11 +166,11 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     }
 
     /// <summary>
-    /// Projects the shape onto a vector.
+    /// Projects the <see cref="Shape2D"/> onto a vector.
     /// </summary>
-    /// <param name="shape">The shape to project.</param>
+    /// <param name="shape">The <see cref="Shape2D"/> to project.</param>
     /// <param name="projectionVector">The vector to project onto.</param>
-    /// <returns>The projection of the shape onto the vector.</returns>
+    /// <returns>The projection of the <see cref="Shape2D"/> onto the vector.</returns>
     public static Projection1D Project(Shape2D shape, Vector2D projectionVector)
     {
         float min = float.MaxValue;
@@ -161,44 +187,44 @@ public readonly struct Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     }
 
     /// <summary>
-    /// Transforms the shape using the specified transform.
+    /// Transforms the <see cref="Shape2D"/> using the specified <see cref="ITransform2D"/>.
     /// </summary>
-    /// <param name="shape">The shape to transform.</param>
-    /// <param name="transform">The transform to apply.</param>
-    /// <returns>The transformed shape.</returns>
-    public static Shape2D TransformShape(Shape2D shape, ITransform2D transform)
+    /// <param name="shape">The <see cref="Shape2D"/> to transform.</param>
+    /// <param name="transform">The <see cref="ITransform2D"/> to apply.</param>
+    /// <returns>The transformed <see cref="Shape2D"/>.</returns>
+    public static Shape2D Transform(Shape2D shape, ITransform2D transform)
     {
         List<Vector2D> vertices = new(shape.Vertices.Count);
 
         int count = shape.Vertices.Count;
         for (int i = 0; i < count; i++)
-            vertices.Add(transform.TransformVector2D(shape[i]));
+            vertices.Add(transform.Transform(shape[i]));
 
         return new Shape2D(vertices);
     }
 
     /// <summary>
-    /// Transforms the shape using the specified transform.
+    /// Transforms the <see cref="Shape2D"/> using the specified <see cref="ITransform2D"/>.
     /// </summary>
-    /// <param name="from">The shape to transform.</param>
-    /// <param name="transform">The transform to apply.</param>
-    /// <param name="to">The transformed shape.</param>
-    public static void TransformShape(Shape2D from, ITransform2D transform, ref Shape2D to)
+    /// <param name="from">The <see cref="Shape2D"/> to transform.</param>
+    /// <param name="transform">The <see cref="ITransform2D"/> to apply.</param>
+    /// <param name="to">The transformed <see cref="Shape2D"/>.</param>
+    public static void Transform(Shape2D from, ITransform2D transform, ref Shape2D to)
     {
         to._verticesList.Clear();
 
         int count = from._verticesList.Count;
         for (int i = 0; i < count; i++)
-            to._verticesList.Add(transform.TransformVector2D(from[i]));
+            to._verticesList.Add(transform.Transform(from[i]));
     }
 
     /// <summary>
-    /// Determines whether two shapes are approximately equal.
+    /// Determines whether two <see cref="Shape2D"/>s are approximately equal.
     /// </summary>
-    /// <param name="left">The first shape to compare.</param>
-    /// <param name="right">The second shape to compare.</param>
+    /// <param name="left">The first <see cref="Shape2D"/> to compare.</param>
+    /// <param name="right">The second <see cref="Shape2D"/> to compare.</param>
     /// <param name="epsilon">The epsilon range.</param>
-    /// <returns><c>true</c> if the shapes are approximately equal; otherwise, <c>false</c>.</returns>
+    /// <returns><c>true</c> if the <see cref="Shape2D"/>s are approximately equal; otherwise, <c>false</c>.</returns>
     public static bool ApproximatelyEquals(Shape2D left, Shape2D right, float epsilon = float.Epsilon)
     {
         if (left.Vertices.Count != right.Vertices.Count)
@@ -229,6 +255,12 @@ public static class Shape2DExtensions
     /// <inheritdoc cref="Shape2D.GetSuperTriangle(Shape2D)" />
     public static Triangle ToSuperTriangle(this Shape2D shape) => Shape2D.GetSuperTriangle(shape);
 
+    /// <inheritdoc cref="Shape2D.TriangulateConvex(Shape2D, IList{Triangle})" />
+    public static void ToTrianglesConvex(this Shape2D shape, IList<Triangle> lines) => Shape2D.TriangulateConvex(shape, lines);
+
+    /// <inheritdoc cref="Shape2D.TriangulateConvex(Shape2D)" />
+    public static List<Triangle> ToTrianglesConvex(this Shape2D shape) => Shape2D.TriangulateConvex(shape);
+
     /// <inheritdoc cref="Shape2D.GetLines(Shape2D, IList{Line2D})" />
     public static void ToLines(this Shape2D shape, IList<Line2D> lines) => Shape2D.GetLines(shape, lines);
 
@@ -241,11 +273,17 @@ public static class Shape2DExtensions
     /// <inheritdoc cref="Shape2D.Project(Shape2D, Vector2D)" />
     public static Projection1D ToProjection(this Shape2D shape, Vector2D projectionVector) => Shape2D.Project(shape, projectionVector);
 
-    /// <inheritdoc cref="Shape2D.TransformShape(Shape2D, ITransform2D)" />
-    public static Shape2D TransformShape(this ITransform2D transform, Shape2D shape) => Shape2D.TransformShape(shape, transform);
+    /// <inheritdoc cref="Shape2D.Transform(Shape2D, ITransform2D)" />
+    public static Shape2D Transform(this ITransform2D transform, Shape2D shape) => Shape2D.Transform(shape, transform);
 
-    /// <inheritdoc cref="Shape2D.TransformShape(Shape2D, ITransform2D, Shape2D)" />
-    public static void TransformShape(this ITransform2D transform, Shape2D from, ref Shape2D to) => Shape2D.TransformShape(from, transform, ref to);
+    /// <inheritdoc cref="Shape2D.Transform(Shape2D, ITransform2D, Shape2D)" />
+    public static void Transform(this ITransform2D transform, Shape2D from, ref Shape2D to) => Shape2D.Transform(from, transform, ref to);
+
+    /// <inheritdoc cref="Shape2D.Transform(Shape2D, ITransform2D)" />
+    public static Shape2D Transform(this Shape2D shape, ITransform2D transform) => Shape2D.Transform(shape, transform);
+
+    /// <inheritdoc cref="Shape2D.Transform(Shape2D, ITransform2D, ref Shape2D)" />
+    public static void Transform(this Shape2D from, ITransform2D transform, ref Shape2D to) => Shape2D.Transform(from, transform, ref to);
 
     /// <inheritdoc cref="Shape2D.ApproximatelyEquals(Shape2D, Shape2D, float)" />
     public static bool ApproximatelyEquals(this Shape2D left, Shape2D right, float epsilon = float.Epsilon) => Shape2D.ApproximatelyEquals(left, right, epsilon);

Engine.Core/Primitives/Vector2D.cs

@@ -1,4 +1,5 @@
 using System;
+using Syntriax.Engine.Core.Abstract;
 
 namespace Syntriax.Engine.Core;
 
@@ -278,6 +279,17 @@ public readonly struct Vector2D(float x, float y)
         return 0;
     }
 
+    /// <summary>
+    /// Transforms the <see cref="Vector2D"/> using the specified <see cref="ITransform2D"/>.
+    /// </summary>
+    /// <param name="vector">The <see cref="Vector2D"/> to transform.</param>
+    /// <param name="transform">The <see cref="ITransform2D"/> to apply.</param>
+    /// <returns>The transformed <see cref="Vector2D"/>.</returns>
+    public static Vector2D Transform(Vector2D vector, ITransform2D transform)
+        => vector.Scale(transform.Scale)
+                 .Rotate(transform.Rotation * Math.DegreeToRadian)
+                 .Add(transform.Position);
+
     /// <summary>
     /// Checks if two <see cref="Vector2D"/>s are approximately equal within a specified epsilon range.
     /// </summary>
@@ -379,6 +391,12 @@ public static class Vector2DExtensions
     /// <inheritdoc cref="Vector2D.Dot(Vector2D, Vector2D)" />
     public static float Dot(this Vector2D left, Vector2D right) => Vector2D.Dot(left, right);
 
+    /// <inheritdoc cref="Vector2D.Transform(Vector2D, ITransform2D)" />
+    public static Vector2D Transform(this Vector2D vector, ITransform2D transform) => Vector2D.Transform(vector, transform);
+
+    /// <inheritdoc cref="Vector2D.Transform(Vector2D, ITransform2D)" />
+    public static Vector2D Transform(this ITransform2D transform, Vector2D vector) => Vector2D.Transform(vector, transform);
+
     /// <inheritdoc cref="Vector2D.ApproximatelyEquals(Vector2D, Vector2D, float) " />
     public static bool ApproximatelyEquals(this Vector2D left, Vector2D right, float epsilon = float.Epsilon) => Vector2D.ApproximatelyEquals(left, right, epsilon);
 }

Engine.Core/Transform2D.cs

@@ -92,10 +92,13 @@ public class Transform2D : Behaviour, ITransform2D
                 return;
 
             Vector2D previousScale = _scale;
+            Vector2D previousPosition = _position;
             _localScale = value;
 
             UpdateScale();
+            UpdatePosition();
             OnScaleChanged?.Invoke(this, previousScale);
+            OnPositionChanged?.Invoke(this, previousPosition);
         }
     }
 
@@ -120,13 +123,9 @@ public class Transform2D : Behaviour, ITransform2D
         if (parentTransform is null)
             return;
 
-        float previousRotation = Rotation;
-
         UpdatePosition();
-        UpdateRotation();
 
         OnPositionChanged?.Invoke(this, previousPosition);
-        OnRotationChanged?.Invoke(this, previousRotation);
     }
 
     private void RecalculateScale(ITransform2D _, Vector2D previousScale)
@@ -134,9 +133,13 @@ public class Transform2D : Behaviour, ITransform2D
         if (parentTransform is null)
             return;
 
+        Vector2D previousPosition = _position;
+
         UpdateScale();
+        UpdatePosition();
 
         OnScaleChanged?.Invoke(this, previousScale);
+        OnPositionChanged?.Invoke(this, previousPosition);
     }
 
     private void RecalculateRotation(ITransform2D _, float previousRotation)
@@ -146,11 +149,11 @@ public class Transform2D : Behaviour, ITransform2D
 
         Vector2D previousPosition = Position;
 
-        UpdatePosition();
         UpdateRotation();
+        UpdatePosition();
 
-        OnPositionChanged?.Invoke(this, previousPosition);
         OnRotationChanged?.Invoke(this, previousRotation);
+        OnPositionChanged?.Invoke(this, previousPosition);
     }
 
     private void UpdateLocalPosition()
@@ -203,32 +206,31 @@ public class Transform2D : Behaviour, ITransform2D
 
     protected override void InitializeInternal()
     {
-        UpdateParent(BehaviourController.HierarchyObject.Parent);
-        BehaviourController.HierarchyObject.OnParentChanged += OnParentChanged;
+        UpdateReferences(HierarchyObject.Parent);
+        HierarchyObject.OnParentChanged += OnParentChanged;
     }
 
     protected override void FinalizeInternal()
     {
-        BehaviourController.HierarchyObject.OnParentChanged -= OnParentChanged;
+        HierarchyObject.OnParentChanged -= OnParentChanged;
     }
 
-    private void UpdateParent(IHierarchyObject? parent)
+    private void UpdateReferences(IHierarchyObject? parent)
     {
         ITransform2D? previousParent = parentTransform;
         if (previousParent is not null)
         {
-            previousParent.BehaviourController.HierarchyObject.RemoveChild(HierarchyObject);
             previousParent.OnPositionChanged -= RecalculatePosition;
             previousParent.OnScaleChanged -= RecalculateScale;
             previousParent.OnRotationChanged -= RecalculateRotation;
             previousParent.BehaviourController.HierarchyObject.OnParentChanged -= OnParentChanged;
+            previousParent.BehaviourController.OnBehaviourAdded -= LookForTransform2D;
         }
 
         parentTransform = parent?.BehaviourController.GetBehaviour<ITransform2D>();
 
         if (parentTransform is not null)
         {
-            parentTransform.BehaviourController.HierarchyObject.AddChild(HierarchyObject);
             parentTransform.OnPositionChanged += RecalculatePosition;
             parentTransform.OnScaleChanged += RecalculateScale;
             parentTransform.OnRotationChanged += RecalculateRotation;
@@ -238,6 +240,8 @@ public class Transform2D : Behaviour, ITransform2D
             UpdateScale();
             UpdateRotation();
         }
+        else if (HierarchyObject.Parent is not null)
+            HierarchyObject.Parent.BehaviourController.OnBehaviourAdded += LookForTransform2D;
 
         UpdateLocalPosition();
         UpdateLocalScale();
@@ -248,8 +252,16 @@ public class Transform2D : Behaviour, ITransform2D
         OnRotationChanged?.Invoke(this, Rotation);
     }
 
+    private void LookForTransform2D(IBehaviourController sender, IBehaviour behaviourAdded)
+    {
+        if (behaviourAdded is not ITransform2D transform2D)
+            return;
+
+        UpdateReferences(HierarchyObject.Parent);
+    }
+
     private void OnParentChanged(IHierarchyObject sender, IHierarchyObject? previousParent, IHierarchyObject? newParent)
     {
-        UpdateParent(newParent);
+        UpdateReferences(newParent);
     }
 }

Engine.Physics2D/Collider2DBehaviourBase.cs

@@ -10,7 +10,7 @@ public abstract class Collider2DBehaviourBase : Behaviour2D, ICollider2D
     public event ICollider2D.CollisionResolvedEventHandler? OnCollisionResolved = null;
     public event ICollider2D.TriggeredEventHandler? OnTriggered = null;
 
-    protected bool NeedsRecalculation { get; private set; } = true;
+    protected bool NeedsRecalculation { get; set; } = true;
     protected IRigidBody2D? _rigidBody2D = null;
 
     public IRigidBody2D? RigidBody2D => _rigidBody2D;

Engine.Physics2D/Collider2DCircleBehaviour.cs

@@ -5,10 +5,20 @@ namespace Syntriax.Engine.Physics2D;
 
 public class Collider2DCircleBehaviour : Collider2DBehaviourBase, ICircleCollider2D
 {
-    public Circle CircleWorld { get; protected set; } = Circle.UnitCircle;
-    public Circle CircleLocal { get; set; } = Circle.UnitCircle;
+    private Circle _circleLocal = Circle.UnitCircle;
 
-    public override void CalculateCollider() => CircleWorld = Transform.TransformCircle(CircleLocal);
+    public Circle CircleWorld { get; protected set; } = Circle.UnitCircle;
+    public Circle CircleLocal
+    {
+        get => _circleLocal;
+        set
+        {
+            _circleLocal = value;
+            NeedsRecalculation = true;
+        }
+    }
+
+    public override void CalculateCollider() => CircleWorld = Transform.Transform(_circleLocal);
 
     public Collider2DCircleBehaviour() { }
     public Collider2DCircleBehaviour(Circle circle) => CircleLocal = circle;

Engine.Physics2D/Collider2DShapeBehaviour.cs

@@ -6,12 +6,24 @@ namespace Syntriax.Engine.Physics2D;
 public class Collider2DShapeBehaviour : Collider2DBehaviourBase, IShapeCollider2D
 {
     public Shape2D ShapeWorld { get => _shapeWorld; protected set => _shapeWorld = value; }
-    public Shape2D ShapeLocal { get; set; } = Shape2D.Box;
+    public Shape2D ShapeLocal
+    {
+        get => _shapeLocal;
+        set
+        {
+            _shapeLocal = value;
+            NeedsRecalculation = true;
+        }
+    }
 
-    private Shape2D _shapeWorld = Shape2D.Box.CreateCopy();
+    private Shape2D _shapeWorld = Shape2D.Square.CreateCopy();
+    private Shape2D _shapeLocal = Shape2D.Square;
 
-    public override void CalculateCollider() => Transform.TransformShape(ShapeLocal, ref _shapeWorld);
+    public override void CalculateCollider() => Transform.Transform(ShapeLocal, ref _shapeWorld);
 
     public Collider2DShapeBehaviour() { }
-    public Collider2DShapeBehaviour(Shape2D shape) => ShapeLocal = shape;
+    public Collider2DShapeBehaviour(Shape2D shape)
+    {
+        ShapeLocal = shape;
+    }
 }

Engine.Physics2D/PhysicsEngine2D.cs

@@ -1,43 +1,27 @@
-using System.Collections.Generic;
-
+using Syntriax.Engine.Core;
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Physics2D.Abstract;
 
 namespace Syntriax.Engine.Physics2D;
 
-public class PhysicsEngine2D : IPhysicsEngine2D
+public class PhysicsEngine2D : HierarchyObject, IPhysicsEngine2D
 {
     public event IPhysicsEngine2D.PhysicsIterationEventHandler? OnPhysicsIteration = null;
     public event IPhysicsEngine2D.PhysicsStepEventHandler? OnPhysicsStep = null;
 
-    private readonly List<IRigidBody2D> rigidBodies = new(32);
-    private readonly List<ICollider2D> colliders = new(64);
+    private float physicsTicker = 0f;
+    private int _iterationPerStep = 1;
+    private float _iterationPeriod = 1f / 60f;
 
-    private int _iterationCount = 1;
+    protected readonly ICollisionDetector2D collisionDetector = null!;
+    protected readonly ICollisionResolver2D collisionResolver = null!;
 
-    private readonly ICollisionDetector2D collisionDetector = null!;
-    private readonly ICollisionResolver2D collisionResolver = null!;
+    protected BehaviourCollector<IRigidBody2D> rigidBodyCollector = new();
+    protected BehaviourCollector<ICollider2D> colliderCollector = new();
+    protected BehaviourCollector<IPhysicsUpdate> physicsUpdateCollector = new();
 
-    public int IterationPerStep { get => _iterationCount; set => _iterationCount = value < 1 ? 1 : value; }
-
-    public void AddRigidBody(IRigidBody2D rigidBody)
-    {
-        if (rigidBodies.Contains(rigidBody))
-            return;
-
-        rigidBodies.Add(rigidBody);
-
-        foreach (ICollider2D collider2D in rigidBody.BehaviourController.GetBehaviours<ICollider2D>())
-            colliders.Add(collider2D);
-
-        rigidBody.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;
-        rigidBody.BehaviourController.OnBehaviourRemoved += OnBehaviourRemoved;
-    }
-
-    public void RemoveRigidBody(IRigidBody2D rigidBody)
-    {
-        rigidBodies.Remove(rigidBody);
-    }
+    public int IterationPerStep { get => _iterationPerStep; set => _iterationPerStep = value < 1 ? 1 : value; }
+    public float IterationPeriod { get => _iterationPeriod; set => _iterationPeriod = value.Max(0.0001f); }
 
     public void Step(float deltaTime)
     {
@@ -46,23 +30,23 @@ public class PhysicsEngine2D : IPhysicsEngine2D
         for (int iterationIndex = 0; iterationIndex < IterationPerStep; iterationIndex++)
         {
             // Can Parallel
-            for (int i = 0; i < rigidBodies.Count; i++)
-                StepRigidBody(rigidBodies[i], intervalDeltaTime);
+            foreach (IRigidBody2D rigidBody in rigidBodyCollector)
+                StepRigidBody(rigidBody, intervalDeltaTime);
 
             // Can Parallel
-            foreach (ICollider2D collider in colliders)
+            foreach (ICollider2D collider in colliderCollector)
                 collider.Recalculate();
 
             // Can Parallel
-            for (int x = 0; x < colliders.Count; x++)
+            for (int x = 0; x < colliderCollector.Behaviours.Count; x++)
             {
-                ICollider2D? colliderX = colliders[x];
+                ICollider2D? colliderX = colliderCollector.Behaviours[x];
                 if (!colliderX.IsActive)
                     return;
 
-                for (int y = x + 1; y < colliders.Count; y++)
+                for (int y = x + 1; y < colliderCollector.Behaviours.Count; y++)
                 {
-                    ICollider2D? colliderY = colliders[y];
+                    ICollider2D? colliderY = colliderCollector.Behaviours[y];
 
                     if (!colliderY.IsActive)
                         return;
@@ -87,7 +71,7 @@ public class PhysicsEngine2D : IPhysicsEngine2D
                         }
                         else if (colliderY.IsTrigger)
                         {
-                            colliderY.Trigger(colliderY);
+                            colliderY.Trigger(colliderX);
                             continue;
                         }
 
@@ -106,8 +90,13 @@ public class PhysicsEngine2D : IPhysicsEngine2D
                     }
                 }
             }
+
             OnPhysicsIteration?.Invoke(this, intervalDeltaTime);
         }
+
+        foreach (IPhysicsUpdate physicsUpdate in physicsUpdateCollector)
+            physicsUpdate.PhysicsUpdate(deltaTime);
+
         OnPhysicsStep?.Invoke(this, deltaTime);
     }
 
@@ -120,20 +109,33 @@ public class PhysicsEngine2D : IPhysicsEngine2D
         rigidBody.Transform.Rotation += rigidBody.AngularVelocity * intervalDeltaTime;
     }
 
-    private void OnBehaviourAdded(IBehaviourController controller, IBehaviour behaviour)
+    protected override void OnEnteringHierarchy(IGameManager gameManager)
     {
-        if (behaviour is not ICollider2D collider2D)
-            return;
+        physicsUpdateCollector.Assign(gameManager);
+        colliderCollector.Assign(gameManager);
+        rigidBodyCollector.Assign(gameManager);
 
-        colliders.Add(collider2D);
+        gameManager.OnPreUpdate += OnEnginePreUpdate;
     }
 
-    private void OnBehaviourRemoved(IBehaviourController controller, IBehaviour behaviour)
+    protected override void OnExitingHierarchy(IGameManager gameManager)
     {
-        if (behaviour is not ICollider2D collider2D)
-            return;
+        physicsUpdateCollector.Unassign();
+        colliderCollector.Unassign();
+        rigidBodyCollector.Unassign();
 
-        colliders.Remove(collider2D);
+        gameManager.OnPreUpdate -= OnEnginePreUpdate;
+    }
+
+    private void OnEnginePreUpdate(IGameManager sender, EngineTime engineTime)
+    {
+        physicsTicker += engineTime.DeltaTime;
+
+        while (physicsTicker >= IterationPeriod)
+        {
+            physicsTicker -= IterationPeriod;
+            Step(IterationPeriod);
+        }
     }
 
     public PhysicsEngine2D()

Engine.Physics2D/PhysicsEngine2DStandalone.cs

@@ -1,24 +1,43 @@
-using Syntriax.Engine.Core;
+using System.Collections.Generic;
+
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Physics2D.Abstract;
 
 namespace Syntriax.Engine.Physics2D;
 
-public class PhysicsEngine2DCollector : HierarchyObject, IPhysicsEngine2D
+public class PhysicsEngine2DStandalone : IPhysicsEngine2D
 {
     public event IPhysicsEngine2D.PhysicsIterationEventHandler? OnPhysicsIteration = null;
     public event IPhysicsEngine2D.PhysicsStepEventHandler? OnPhysicsStep = null;
 
-    private int _iterationPerStep = 1;
+    private readonly List<IRigidBody2D> rigidBodies = new(32);
+    private readonly List<ICollider2D> colliders = new(64);
 
-    protected readonly ICollisionDetector2D collisionDetector = null!;
-    protected readonly ICollisionResolver2D collisionResolver = null!;
+    private int _iterationCount = 1;
 
-    protected BehaviourCollector<IRigidBody2D> rigidBodyCollector = new();
-    protected BehaviourCollector<ICollider2D> colliderCollector = new();
-    protected BehaviourCollector<IPhysicsUpdate> physicsUpdateCollector = new();
+    private readonly ICollisionDetector2D collisionDetector = null!;
+    private readonly ICollisionResolver2D collisionResolver = null!;
 
-    public int IterationPerStep { get => _iterationPerStep; set => _iterationPerStep = value < 1 ? 1 : value; }
+    public int IterationPerStep { get => _iterationCount; set => _iterationCount = value < 1 ? 1 : value; }
+
+    public void AddRigidBody(IRigidBody2D rigidBody)
+    {
+        if (rigidBodies.Contains(rigidBody))
+            return;
+
+        rigidBodies.Add(rigidBody);
+
+        foreach (ICollider2D collider2D in rigidBody.BehaviourController.GetBehaviours<ICollider2D>())
+            colliders.Add(collider2D);
+
+        rigidBody.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;
+        rigidBody.BehaviourController.OnBehaviourRemoved += OnBehaviourRemoved;
+    }
+
+    public void RemoveRigidBody(IRigidBody2D rigidBody)
+    {
+        rigidBodies.Remove(rigidBody);
+    }
 
     public void Step(float deltaTime)
     {
@@ -27,23 +46,23 @@ public class PhysicsEngine2DCollector : HierarchyObject, IPhysicsEngine2D
         for (int iterationIndex = 0; iterationIndex < IterationPerStep; iterationIndex++)
         {
             // Can Parallel
-            foreach (IRigidBody2D rigidBody in rigidBodyCollector)
-                StepRigidBody(rigidBody, intervalDeltaTime);
+            for (int i = 0; i < rigidBodies.Count; i++)
+                StepRigidBody(rigidBodies[i], intervalDeltaTime);
 
             // Can Parallel
-            foreach (ICollider2D collider in colliderCollector)
+            foreach (ICollider2D collider in colliders)
                 collider.Recalculate();
 
             // Can Parallel
-            for (int x = 0; x < colliderCollector.Behaviours.Count; x++)
+            for (int x = 0; x < colliders.Count; x++)
             {
-                ICollider2D? colliderX = colliderCollector.Behaviours[x];
+                ICollider2D? colliderX = colliders[x];
                 if (!colliderX.IsActive)
                     return;
 
-                for (int y = x + 1; y < colliderCollector.Behaviours.Count; y++)
+                for (int y = x + 1; y < colliders.Count; y++)
                 {
-                    ICollider2D? colliderY = colliderCollector.Behaviours[y];
+                    ICollider2D? colliderY = colliders[y];
 
                     if (!colliderY.IsActive)
                         return;
@@ -68,7 +87,7 @@ public class PhysicsEngine2DCollector : HierarchyObject, IPhysicsEngine2D
                         }
                         else if (colliderY.IsTrigger)
                         {
-                            colliderY.Trigger(colliderY);
+                            colliderY.Trigger(colliderX);
                             continue;
                         }
 
@@ -87,13 +106,8 @@ public class PhysicsEngine2DCollector : HierarchyObject, IPhysicsEngine2D
                     }
                 }
             }
-
             OnPhysicsIteration?.Invoke(this, intervalDeltaTime);
         }
-
-        foreach (IPhysicsUpdate physicsUpdate in physicsUpdateCollector)
-            physicsUpdate.PhysicsUpdate(deltaTime);
-
         OnPhysicsStep?.Invoke(this, deltaTime);
     }
 
@@ -105,27 +119,30 @@ public class PhysicsEngine2DCollector : HierarchyObject, IPhysicsEngine2D
         rigidBody.Transform.Position += rigidBody.Velocity * intervalDeltaTime;
         rigidBody.Transform.Rotation += rigidBody.AngularVelocity * intervalDeltaTime;
     }
-    protected override void OnEnteringHierarchy(IGameManager gameManager)
+
+    private void OnBehaviourAdded(IBehaviourController controller, IBehaviour behaviour)
     {
-        physicsUpdateCollector.Assign(gameManager);
-        colliderCollector.Assign(gameManager);
-        rigidBodyCollector.Assign(gameManager);
+        if (behaviour is not ICollider2D collider2D)
+            return;
+
+        colliders.Add(collider2D);
     }
 
-    protected override void OnExitingHierarchy(IGameManager gameManager)
+    private void OnBehaviourRemoved(IBehaviourController controller, IBehaviour behaviour)
     {
-        physicsUpdateCollector.Unassign();
-        colliderCollector.Unassign();
-        rigidBodyCollector.Unassign();
+        if (behaviour is not ICollider2D collider2D)
+            return;
+
+        colliders.Remove(collider2D);
     }
 
-    public PhysicsEngine2DCollector()
+    public PhysicsEngine2DStandalone()
     {
         collisionDetector = new CollisionDetector2D();
         collisionResolver = new CollisionResolver2D();
     }
 
-    public PhysicsEngine2DCollector(ICollisionDetector2D collisionDetector, ICollisionResolver2D collisionResolver)
+    public PhysicsEngine2DStandalone(ICollisionDetector2D collisionDetector, ICollisionResolver2D collisionResolver)
     {
         this.collisionDetector = collisionDetector;
         this.collisionResolver = collisionResolver;

Engine.Systems/Time/IStopwatch.cs

@@ -2,9 +2,9 @@ namespace Syntriax.Engine.Systems.Time;
 
 public interface IStopwatch : IReadOnlyStopwatch
 {
-    void StopwatchStart();
-    void StopwatchStop();
+    void Start();
+    void Stop();
 
-    void StopwatchPause();
-    void StopwatchResume();
+    void Pause();
+    void Resume();
 }

Engine.Systems/Time/ITicker.cs

@@ -5,7 +5,7 @@ public interface ITicker : IStopwatch
     event TickerTickEventHandler? OnTick;
 
     int TickCounter { get; }
-    double TickPeriod { get; set; }
+    double Period { get; set; }
 
     delegate void TickerTickEventHandler(ITicker sender);
 }

Engine.Systems/Time/ITimer.cs

@@ -2,9 +2,9 @@ namespace Syntriax.Engine.Systems.Time;
 
 public interface ITimer : IReadOnlyTimer
 {
-    void TimerStart(double time);
-    void TimerStop();
+    void Start(double time);
+    void Stop();
 
-    void TimerPause();
-    void TimerResume();
+    void Pause();
+    void Resume();
 }

Engine.Systems/Time/StopwatchBehaviour.cs

@@ -17,7 +17,7 @@ public class StopwatchBehaviour : Behaviour, IStopwatch
     private bool shouldBeTicking = false;
     private bool hasStartedTickingBefore = false;
 
-    public virtual void StopwatchStart()
+    public virtual void Start()
     {
         Time = 0f;
 
@@ -28,7 +28,7 @@ public class StopwatchBehaviour : Behaviour, IStopwatch
             StartStopwatch();
     }
 
-    public virtual void StopwatchStop()
+    public virtual void Stop()
     {
         if (!shouldBeTicking)
             return;
@@ -56,7 +56,7 @@ public class StopwatchBehaviour : Behaviour, IStopwatch
             return;
 
         if (hasStartedTickingBefore)
-            StopwatchResume();
+            Resume();
         else
             StartStopwatch();
     }
@@ -66,16 +66,16 @@ public class StopwatchBehaviour : Behaviour, IStopwatch
         if (!shouldBeTicking || State is not TimerState.Ticking)
             return;
 
-        StopwatchPause();
+        Pause();
     }
 
-    public virtual void StopwatchPause()
+    public virtual void Pause()
     {
         State = TimerState.Paused;
         OnPaused?.Invoke(this);
     }
 
-    public virtual void StopwatchResume()
+    public virtual void Resume()
     {
         State = TimerState.Ticking;
         OnResumed?.Invoke(this);

Engine.Systems/Time/TickerBehaviour.cs

@@ -4,28 +4,28 @@ public class TickerBehaviour : StopwatchBehaviour, ITicker
 {
     public event ITicker.TickerTickEventHandler? OnTick = null;
 
-    public double TickPeriod { get; set; } = 1f;
+    public double Period { get; set; } = 1f;
     public int TickCounter { get; private set; } = 0;
 
     private double nextTick = 0f;
 
-    public override void StopwatchStart()
+    public override void Start()
     {
         TickCounter = 0;
-        base.StopwatchStart();
-        nextTick = Time + TickPeriod;
+        base.Start();
+        nextTick = Time + Period;
     }
 
     protected override void OnUpdate()
     {
         base.OnUpdate();
 
-        if (Time < nextTick)
-            return;
-
-        nextTick += TickPeriod;
-        TickCounter++;
-        OnTick?.Invoke(this);
+        while (Time > nextTick)
+        {
+            nextTick += Period;
+            TickCounter++;
+            OnTick?.Invoke(this);
+        }
     }
 
     protected override void OnFinalize()

Engine.Systems/Time/TimerBehaviour.cs

@@ -31,7 +31,7 @@ public class TimerBehaviour : Behaviour, ITimer
     private bool shouldBeTicking = false;
     private bool hasStartedTickingBefore = false;
 
-    public virtual void TimerStart(double time)
+    public virtual void Start(double time)
     {
         StartTime = time;
         Remaining = time;
@@ -43,7 +43,7 @@ public class TimerBehaviour : Behaviour, ITimer
             StartTimer();
     }
 
-    public virtual void TimerStop()
+    public virtual void Stop()
     {
         if (!shouldBeTicking)
             return;
@@ -65,7 +65,7 @@ public class TimerBehaviour : Behaviour, ITimer
         OnDelta?.Invoke(this, delta);
 
         if (Remaining <= .0f)
-            TimerStop();
+            Stop();
     }
 
     protected override void OnEnteredHierarchy(IGameManager gameManager)
@@ -74,7 +74,7 @@ public class TimerBehaviour : Behaviour, ITimer
             return;
 
         if (hasStartedTickingBefore)
-            TimerResume();
+            Resume();
         else
             StartTimer();
     }
@@ -84,16 +84,16 @@ public class TimerBehaviour : Behaviour, ITimer
         if (!shouldBeTicking || State is not TimerState.Ticking)
             return;
 
-        TimerPause();
+        Pause();
     }
 
-    public virtual void TimerPause()
+    public virtual void Pause()
     {
         State = TimerState.Paused;
         OnPaused?.Invoke(this);
     }
 
-    public virtual void TimerResume()
+    public virtual void Resume()
     {
         State = TimerState.Ticking;
         OnResumed?.Invoke(this);

Engine.Systems/Tween/Easings.cs

@@ -7,66 +7,66 @@ internal static class EaseConstants
     internal const float c1 = 1.70158f;
     internal const float c2 = c1 * 1.525f;
     internal const float c3 = c1 + 1f;
-    internal const float c4 = 2f * Core.Math.PI / 3;
+    internal const float c4 = 2f * Core.Math.PI / 3f;
     internal const float c5 = 2f * Core.Math.PI / 4.5f;
 }
 
-public readonly struct EaseLinear : IEasing { public readonly float Evaluate(float value) => value; }
+public readonly struct EaseLinear : IEasing { public readonly float Evaluate(float x) => x; }
 
-public readonly struct EaseInQuad : IEasing { public readonly float Evaluate(float value) => value * value; }
-public readonly struct EaseOutQuad : IEasing { public readonly float Evaluate(float value) => 1f - (1f - value) * (1f - value); }
-public readonly struct EaseInOutQuad : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? 2f * value * value : 1f - Core.Math.Pow(-2f * value + 2f, 2f) * .5f; }
+public readonly struct EaseInQuad : IEasing { public readonly float Evaluate(float x) => x * x; }
+public readonly struct EaseOutQuad : IEasing { public readonly float Evaluate(float x) => 1f - (1f - x) * (1f - x); }
+public readonly struct EaseInOutQuad : IEasing { public readonly float Evaluate(float x) => x < .5f ? 2f * x * x : 1f - Core.Math.Pow(-2f * x + 2f, 2f) * .5f; }
 
-public readonly struct EaseInCubic : IEasing { public readonly float Evaluate(float value) => value * value * value; }
-public readonly struct EaseOutCubic : IEasing { public readonly float Evaluate(float value) => 1f - Core.Math.Pow(1f - value, 3); }
-public readonly struct EaseInOutCubic : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? 4f * value * value * value : 1f - Core.Math.Pow(-2f * value + 2f, 3) * .5f; }
+public readonly struct EaseInCubic : IEasing { public readonly float Evaluate(float x) => x * x * x; }
+public readonly struct EaseOutCubic : IEasing { public readonly float Evaluate(float x) => 1f - Core.Math.Pow(1f - x, 3f); }
+public readonly struct EaseInOutCubic : IEasing { public readonly float Evaluate(float x) => x < .5f ? 4f * x * x * x : 1f - Core.Math.Pow(-2f * x + 2f, 3f) * .5f; }
 
-public readonly struct EaseInQuart : IEasing { public readonly float Evaluate(float value) => value * value * value * value; }
-public readonly struct EaseOutQuart : IEasing { public readonly float Evaluate(float value) => 1f - Core.Math.Pow(1f - value, 4f); }
-public readonly struct EaseInOutQuart : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? 8 * value * value * value * value : 1f - Core.Math.Pow(-2f * value + 2f, 4f) * .5f; }
+public readonly struct EaseInQuart : IEasing { public readonly float Evaluate(float x) => x * x * x * x; }
+public readonly struct EaseOutQuart : IEasing { public readonly float Evaluate(float x) => 1f - Core.Math.Pow(1f - x, 4f); }
+public readonly struct EaseInOutQuart : IEasing { public readonly float Evaluate(float x) => x < .5f ? 8f * x * x * x * x : 1f - Core.Math.Pow(-2f * x + 2f, 4f) * .5f; }
 
-public readonly struct EaseInQuint : IEasing { public readonly float Evaluate(float value) => value * value * value * value * value; }
-public readonly struct EaseOutQuint : IEasing { public readonly float Evaluate(float value) => 1f - Core.Math.Pow(1f - value, 5); }
-public readonly struct EaseInOutQuint : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? 16 * value * value * value * value * value : 1f - Core.Math.Pow(-2f * value + 2f, 5) * .5f; }
+public readonly struct EaseInQuint : IEasing { public readonly float Evaluate(float x) => x * x * x * x * x; }
+public readonly struct EaseOutQuint : IEasing { public readonly float Evaluate(float x) => 1f - Core.Math.Pow(1f - x, 5f); }
+public readonly struct EaseInOutQuint : IEasing { public readonly float Evaluate(float x) => x < .5f ? 16f * x * x * x * x * x : 1f - Core.Math.Pow(-2f * x + 2f, 5f) * .5f; }
 
-public readonly struct EaseInSine : IEasing { public readonly float Evaluate(float value) => 1f - Core.Math.Cos(value * Core.Math.PI * .5f); }
-public readonly struct EaseOutSine : IEasing { public readonly float Evaluate(float value) => Core.Math.Sin(value * Core.Math.PI * .5f); }
-public readonly struct EaseInOutSine : IEasing { public readonly float Evaluate(float value) => -(Core.Math.Cos(Core.Math.PI * value) - 1f) * .5f; }
+public readonly struct EaseInSine : IEasing { public readonly float Evaluate(float x) => 1f - Core.Math.Cos(x * Core.Math.PI * .5f); }
+public readonly struct EaseOutSine : IEasing { public readonly float Evaluate(float x) => Core.Math.Sin(x * Core.Math.PI * .5f); }
+public readonly struct EaseInOutSine : IEasing { public readonly float Evaluate(float x) => -(Core.Math.Cos(Core.Math.PI * x) - 1f) * .5f; }
 
-public readonly struct EaseInExpo : IEasing { public readonly float Evaluate(float value) => value == 0 ? 0 : Core.Math.Pow(2f, 10f * value - 10f); }
-public readonly struct EaseOutExpo : IEasing { public readonly float Evaluate(float value) => value == 1f ? 1f : 1f - Core.Math.Pow(2f, -10f * value); }
-public readonly struct EaseInOutExpo : IEasing { public readonly float Evaluate(float value) => value == 0 ? 0 : value == 1f ? 1f : value < 0.5f ? Core.Math.Pow(2f, 20 * value - 10f) * .5f : (2f - Core.Math.Pow(2f, -20 * value + 10f)) * .5f; }
+public readonly struct EaseInExpo : IEasing { public readonly float Evaluate(float x) => x == 0f ? 0f : Core.Math.Pow(2f, 10f * x - 10f); }
+public readonly struct EaseOutExpo : IEasing { public readonly float Evaluate(float x) => x == 1f ? 1f : 1f - Core.Math.Pow(2f, -10f * x); }
+public readonly struct EaseInOutExpo : IEasing { public readonly float Evaluate(float x) => x == 0f ? 0f : x == 1f ? 1f : x < .5f ? Core.Math.Pow(2f, 20f * x - 10f) * .5f : (2f - Core.Math.Pow(2f, -20f * x + 10f)) * .5f; }
 
-public readonly struct EaseInCirc : IEasing { public readonly float Evaluate(float value) => 1f - Core.Math.Sqrt(1f - Core.Math.Pow(value, 2f)); }
-public readonly struct EaseOutCirc : IEasing { public readonly float Evaluate(float value) => Core.Math.Sqrt(1f - Core.Math.Pow(value - 1f, 2f)); }
-public readonly struct EaseInOutCirc : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? (1f - Core.Math.Sqrt(1f - Core.Math.Pow(2f * value, 2f))) * .5f : (Core.Math.Sqrt(1f - Core.Math.Pow(-2f * value + 2f, 2f)) + 1f) * .5f; }
+public readonly struct EaseInCirc : IEasing { public readonly float Evaluate(float x) => 1f - Core.Math.Sqrt(1f - Core.Math.Pow(x, 2f)); }
+public readonly struct EaseOutCirc : IEasing { public readonly float Evaluate(float x) => Core.Math.Sqrt(1f - Core.Math.Pow(x - 1f, 2f)); }
+public readonly struct EaseInOutCirc : IEasing { public readonly float Evaluate(float x) => x < .5f ? (1f - Core.Math.Sqrt(1f - Core.Math.Pow(2f * x, 2f))) * .5f : (Core.Math.Sqrt(1f - Core.Math.Pow(-2f * x + 2f, 2f)) + 1f) * .5f; }
 
-public readonly struct EaseInBack : IEasing { public readonly float Evaluate(float value) => EaseConstants.c3 * value * value * value - EaseConstants.c1 * value * value; }
-public readonly struct EaseOutBack : IEasing { public readonly float Evaluate(float value) => 1f + EaseConstants.c3 * Core.Math.Pow(value - 1f, 3) + EaseConstants.c1 * Core.Math.Pow(value - 1f, 2f); }
-public readonly struct EaseInOutBack : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? Core.Math.Pow(2f * value, 2f) * ((EaseConstants.c2 + 1f) * 2f * value - EaseConstants.c2) * .5f : (Core.Math.Pow(2f * value - 2f, 2f) * ((EaseConstants.c2 + 1f) * (value * 2f - 2f) + EaseConstants.c2) + 2f) * .5f; }
+public readonly struct EaseInBack : IEasing { public readonly float Evaluate(float x) => EaseConstants.c3 * x * x * x - EaseConstants.c1 * x * x; }
+public readonly struct EaseOutBack : IEasing { public readonly float Evaluate(float x) => 1f + EaseConstants.c3 * Core.Math.Pow(x - 1f, 3f) + EaseConstants.c1 * Core.Math.Pow(x - 1f, 2f); }
+public readonly struct EaseInOutBack : IEasing { public readonly float Evaluate(float x) => x < .5f ? Core.Math.Pow(2f * x, 2f) * ((EaseConstants.c2 + 1f) * 2f * x - EaseConstants.c2) * .5f : (Core.Math.Pow(2f * x - 2f, 2f) * ((EaseConstants.c2 + 1f) * (x * 2f - 2f) + EaseConstants.c2) + 2f) * .5f; }
 
-public readonly struct EaseInElastic : IEasing { public readonly float Evaluate(float value) => value == 0 ? 0 : value == 1f ? 1f : -Core.Math.Pow(2f, 10f * value - 10f) * Core.Math.Sin((value * 10f - 10.75f) * EaseConstants.c4); }
-public readonly struct EaseOutElastic : IEasing { public readonly float Evaluate(float value) => value == 0 ? 0 : value == 1f ? 1f : Core.Math.Pow(2f, -10f * value) * Core.Math.Sin((value * 10f - 0.75f) * EaseConstants.c4) + 1f; }
-public readonly struct EaseInOutElastic : IEasing { public readonly float Evaluate(float value) => value == 0 ? 0 : value == 1f ? 1f : value < 0.5f ? -(Core.Math.Pow(2f, 20 * value - 10f) * Core.Math.Sin((20 * value - 11.125f) * EaseConstants.c5)) * .5f : Core.Math.Pow(2f, -20 * value + 10f) * Core.Math.Sin((20 * value - 11.125f) * EaseConstants.c5) * .5f + 1f; }
+public readonly struct EaseInElastic : IEasing { public readonly float Evaluate(float x) => x == 0 ? 0 : x == 1f ? 1f : -Core.Math.Pow(2f, 10f * x - 10f) * Core.Math.Sin((x * 10f - 10.75f) * EaseConstants.c4); }
+public readonly struct EaseOutElastic : IEasing { public readonly float Evaluate(float x) => x == 0 ? 0 : x == 1f ? 1f : Core.Math.Pow(2f, -10f * x) * Core.Math.Sin((x * 10f - .75f) * EaseConstants.c4) + 1f; }
+public readonly struct EaseInOutElastic : IEasing { public readonly float Evaluate(float x) => x == 0 ? 0 : x == 1f ? 1f : x < .5f ? -(Core.Math.Pow(2f, 20f * x - 10f) * Core.Math.Sin((20f * x - 11.125f) * EaseConstants.c5)) * .5f : Core.Math.Pow(2f, -20f * x + 10f) * Core.Math.Sin((20f * x - 11.125f) * EaseConstants.c5) * .5f + 1f; }
 
-public readonly struct EaseInBounce : IEasing { public readonly float Evaluate(float value) => 1f - new EaseOutBounce().Evaluate(1f - value); }
+public readonly struct EaseInBounce : IEasing { public readonly float Evaluate(float x) => 1f - new EaseOutBounce().Evaluate(1f - x); }
 public readonly struct EaseOutBounce : IEasing
 {
-    public readonly float Evaluate(float value)
+    public readonly float Evaluate(float x)
     {
         const float n1 = 7.5625f;
         const float d1 = 2.75f;
 
-        if (value < 1 / d1)
-            return n1 * value * value;
+        if (x < 1f / d1)
+            return n1 * x * x;
 
-        if (value < 2 / d1)
-            return n1 * (value -= 1.5f / d1) * value + 0.75f;
+        if (x < 2f / d1)
+            return n1 * (x -= 1.5f / d1) * x + .75f;
 
-        if (value < 2.5 / d1)
-            return n1 * (value -= 2.25f / d1) * value + 0.9375f;
+        if (x < 2.5f / d1)
+            return n1 * (x -= 2.25f / d1) * x + .9375f;
 
-        return n1 * (value -= 2.625f / d1) * value + 0.984375f;
+        return n1 * (x -= 2.625f / d1) * x + .984375f;
     }
 }
-public readonly struct EaseInOutBounce : IEasing { public readonly float Evaluate(float value) => value < 0.5f ? (1f - new EaseOutBounce().Evaluate(1f - 2f * value)) * .5f : (1f + new EaseOutBounce().Evaluate(2f * value - 1f)) * .5f; }
+public readonly struct EaseInOutBounce : IEasing { public readonly float Evaluate(float x) => x < .5f ? (1f - new EaseOutBounce().Evaluate(1f - 2f * x)) * .5f : (1f + new EaseOutBounce().Evaluate(2f * x - 1f)) * .5f; }

Engine.Systems/Tween/IEasing.cs

@@ -2,6 +2,6 @@ namespace Syntriax.Engine.Systems.Tween;
 
 public interface IEasing
 {
-    float Evaluate(float value);
+    float Evaluate(float x);
 }
 

README.md

@@ -1,12 +1,13 @@
 # Work In Progress
 
-This engine is still in development but the implemented features include:
+This engine is still in development so there **WILL** be breaking changes, but the implemented features include:
+
 - Modular Systems
 - Behaviour System
 - 2D Physics Engine(**Not Fully Completed, but usable**)
-    - Rigid Body Simulations
-    - Collision Detection (Convex Shape & Circle)
-    - Collision Resolution (**Not Fully Completed**)
+  - Rigid Body Simulations
+  - Collision Detection (Convex Shape & Circle)
+  - Collision Resolution (**Not Fully Completed**)
 - Vector2D, AABB, Circle, Line, LineEquation, Projection & Shape Data Types
 - General Math