Add pivot offset for rotations.

DaggerFramework/Source/SceneGraph/Entities/Drawable2d.cs

@@ -1,12 +1,14 @@
+using System.Numerics;
 using DaggerFramework.Rendering;
 
 namespace DaggerFramework.SceneGraph
 {
     public abstract class Drawable2d : Entity2d, IDrawable
     {
+        public Vector2 PivotOffset { get; set; }
         public void Draw(Renderer renderer)
         {
-            renderer.SetTransform(Position);
+            renderer.SetTransform(Position, PivotOffset, Rotation);
             OnDraw(renderer);
         }
 

DaggerFramework/Source/SceneGraph/Entities/Entity2d.cs

@@ -5,5 +5,6 @@ namespace DaggerFramework.SceneGraph
     public class Entity2d : Entity
     {
         public Vector2 Position { get; set; }
+        public float Rotation { get; set; }
     }
 }

DaggerFramework/Source/SceneGraph/Entities/Particles2d.cs

@@ -31,7 +31,7 @@ namespace DaggerFramework.SceneGraph
                 var scale = MathUtils.Lerp(_settings.ScaleEnd, _settings.ScaleBegin, t);
                 var color = MathUtils.LerpColor(_settings.ColorEnd, _settings.ColorBegin, t);
 
-                renderer.SetTransform(particle.Position, particle.Rotation);
+                renderer.SetTransform(particle.Position, Vector2.Zero, particle.Rotation);
                 renderer.DrawRectangle(Vector2.One * scale, color);
             }
         }

DaggerFramework/Source/SceneGraph/Entities/RectangleShape2d.cs

@@ -9,6 +9,7 @@ public class RectangleShape2d : Drawable2d
     public Color Color { get; set; } = Color.White;
     public override void OnDraw(Renderer renderer)
     {
+        PivotOffset = Size / 2;
         renderer.DrawRectangle(Size, Color);
     }
 }