From 62e50aefc1b11f2af5ad29ac5af9eac658969686 Mon Sep 17 00:00:00 2001
From: Syntriax <Syntriax@gmail.com>
Date: Fri, 25 Oct 2024 23:10:32 +0300
Subject: [PATCH] feat: IPhysicsEngine2D Events

---
 Engine.Physics2D/Abstract/IPhysicsEngine2D.cs | 13 +++++++++++++
 Engine.Physics2D/PhysicsEngine2D.cs           |  6 +++++-
 Engine.Physics2D/PhysicsEngine2DCollector.cs  |  6 ++++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/Engine.Physics2D/Abstract/IPhysicsEngine2D.cs b/Engine.Physics2D/Abstract/IPhysicsEngine2D.cs
index 71d2003..cd54c09 100644
--- a/Engine.Physics2D/Abstract/IPhysicsEngine2D.cs
+++ b/Engine.Physics2D/Abstract/IPhysicsEngine2D.cs
@@ -5,6 +5,16 @@ namespace Syntriax.Engine.Physics2D.Abstract;
 /// </summary>
 public interface IPhysicsEngine2D
 {
+    /// <summary>
+    /// Event triggered when the <see cref="IPhysicsEngine2D"/> has done a single physics iteration.
+    /// </summary>
+    event OnPhysicsIterationDelegate? OnPhysicsIteration;
+
+    /// <summary>
+    /// Event triggered when the <see cref="IPhysicsEngine2D"/> has done a full physics step/>.
+    /// </summary>
+    event OnPhysicsStepDelegate? OnPhysicsStep;
+
     /// <summary>
     /// The number of iterations the <see cref="IPhysicsEngine2D"/> performs per step.
     /// </summary>
@@ -15,4 +25,7 @@ public interface IPhysicsEngine2D
     /// </summary>
     /// <param name="deltaTime">The time step.</param>
     void Step(float deltaTime);
+
+    delegate void OnPhysicsIterationDelegate(IPhysicsEngine2D sender, float iterationDeltaTime);
+    delegate void OnPhysicsStepDelegate(IPhysicsEngine2D sender, float stepDeltaTime);
 }
diff --git a/Engine.Physics2D/PhysicsEngine2D.cs b/Engine.Physics2D/PhysicsEngine2D.cs
index e333cbe..217396e 100644
--- a/Engine.Physics2D/PhysicsEngine2D.cs
+++ b/Engine.Physics2D/PhysicsEngine2D.cs
@@ -1,6 +1,5 @@
 using System.Collections.Generic;
 
-using Syntriax.Engine.Core;
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Physics2D.Abstract;
 
@@ -8,6 +7,9 @@ namespace Syntriax.Engine.Physics2D;
 
 public class PhysicsEngine2D : IPhysicsEngine2D
 {
+    public event IPhysicsEngine2D.OnPhysicsIterationDelegate? OnPhysicsIteration = null;
+    public event IPhysicsEngine2D.OnPhysicsStepDelegate? OnPhysicsStep = null;
+
     private readonly List<IRigidBody2D> rigidBodies = new(32);
     private readonly List<ICollider2D> colliders = new(64);
 
@@ -96,7 +98,9 @@ public class PhysicsEngine2D : IPhysicsEngine2D
                     }
                 }
             }
+            OnPhysicsIteration?.Invoke(this, intervalDeltaTime);
         }
+        OnPhysicsStep?.Invoke(this, deltaTime);
     }
 
     private static void StepRigidBody(IRigidBody2D rigidBody, float intervalDeltaTime)
diff --git a/Engine.Physics2D/PhysicsEngine2DCollector.cs b/Engine.Physics2D/PhysicsEngine2DCollector.cs
index c7eb131..d89c1b8 100644
--- a/Engine.Physics2D/PhysicsEngine2DCollector.cs
+++ b/Engine.Physics2D/PhysicsEngine2DCollector.cs
@@ -9,6 +9,8 @@ public class PhysicsEngine2DCollector : IPhysicsEngine2D, IAssignableGameManager
     public event IAssignable.OnUnassignedDelegate? OnUnassigned = null;
     public event IAssignableGameManager.OnGameManagerAssignedDelegate? OnGameManagerAssigned = null;
 
+    public event IPhysicsEngine2D.OnPhysicsIterationDelegate? OnPhysicsIteration = null;
+    public event IPhysicsEngine2D.OnPhysicsStepDelegate? OnPhysicsStep = null;
 
     private int _iterationPerStep = 1;
 
@@ -82,10 +84,14 @@ public class PhysicsEngine2DCollector : IPhysicsEngine2D, IAssignableGameManager
                     }
                 }
             }
+
+            OnPhysicsIteration?.Invoke(this, intervalDeltaTime);
         }
 
         foreach (IPhysicsUpdate physicsUpdate in physicsUpdateCollector)
             physicsUpdate.PhysicsUpdate(deltaTime);
+
+        OnPhysicsStep?.Invoke(this, deltaTime);
     }
 
     private static void StepRigidBody(IRigidBody2D rigidBody, float intervalDeltaTime)