feat(physics): added area & inertia calculations for the shape and circles

Engine.Physics2D/Abstract/ICollider2D.cs

@@ -30,6 +30,16 @@ public interface ICollider2D : IBehaviour
     /// </summary>
     IRigidBody2D? RigidBody2D { get; }
 
+    /// <summary>
+    /// The area of the <see cref="ICollider2D"/>.
+    /// </summary>
+    float Area { get; }
+
+    /// <summary>
+    /// The geometric inertia of the <see cref="ICollider2D"/>.
+    /// </summary>
+    float GeometricInertia { get; }
+
     /// <summary>
     /// The value indicating whether the <see cref="ICollider2D"/> is a trigger.
     /// </summary>

Engine.Physics2D/Collider2DBase.cs

@@ -20,6 +20,9 @@ public abstract class Collider2DBase : Behaviour2D, ICollider2D
     public IRigidBody2D? RigidBody2D { get; protected set; } = null;
     public bool IsTrigger { get; set; } = false;
 
+    public abstract float Area { get; }
+    public abstract float GeometricInertia { get; }
+
     public void Recalculate()
     {
         if (!NeedsRecalculation)

Engine.Physics2D/Collider2DCircle.cs

@@ -15,7 +15,15 @@ public class Collider2DCircle : Collider2DBase, ICircleCollider2D
         }
     } = Circle.UnitCircle;
 
-    public override void CalculateCollider() => CircleWorld = Transform.Transform(CircleLocal);
+    private float area = 0f; public override float Area => area;
+    private float geometricInertia = 0f; public override float GeometricInertia => geometricInertia;
+
+    public override void CalculateCollider()
+    {
+        CircleWorld = Transform.Transform(CircleLocal);
+        area = CircleWorld.Area;
+        geometricInertia = CircleWorld.GeometricInertia;
+    }
 
     public Collider2DCircle() { }
     public Collider2DCircle(Circle circle) => CircleLocal = circle;

Engine.Physics2D/Collider2DShape.cs

@@ -15,7 +15,16 @@ public class Collider2DShape : Collider2DBase, IShapeCollider2D
         }
     } = Shape2D.Square;
 
-    public override void CalculateCollider() => ShapeLocal.Transform(Transform, ShapeWorld);
+    private float area = 0f; public override float Area => area;
+    private float geometricInertia = 0f; public override float GeometricInertia => geometricInertia;
+
+    public override void CalculateCollider()
+    {
+        ShapeLocal.Transform(Transform, ShapeWorld);
+
+        area = ShapeWorld.Area;
+        geometricInertia = ShapeWorld.GetGeometricInertia(Transform.Position);
+    }
 
     public Collider2DShape() { }
     public Collider2DShape(Shape2D shape) { ShapeLocal = shape; }