From b45a10b6764685a4e6bb104a05b707e26873af11 Mon Sep 17 00:00:00 2001
From: Michel Fedde <michel.game.de.f@gmail.com>
Date: Sat, 27 Mar 2021 18:07:52 +0100
Subject: [PATCH] Sorts objects by Transformation

---
 SMCode/SM2D/Scene/ItemCollection.cs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/SMCode/SM2D/Scene/ItemCollection.cs b/SMCode/SM2D/Scene/ItemCollection.cs
index 51f7f0d..ff86581 100644
--- a/SMCode/SM2D/Scene/ItemCollection.cs
+++ b/SMCode/SM2D/Scene/ItemCollection.cs
@@ -1,7 +1,9 @@
 #region usings
 
+using System;
 using SM.Base.Scene;
 using SM.Base.Types;
+using SM.Base.Window;
 using SM2D.Types;
 
 #endregion
@@ -16,5 +18,28 @@ namespace SM2D.Scene
         {
             Transform.Size = new CVector2(1);
         }
+
+        public override void Draw(DrawContext context)
+        {
+            this.Sort(Comparitor);
+
+            base.Draw(context);
+        }
+
+        private int Comparitor(IShowItem a, IShowItem b)
+        {
+            if (a is ITransformItem<Transformation> ta)
+            {
+                if (b is ITransformItem<Transformation> tb)
+                {
+                    return (int)((ta.Transform.GetMatrix()[3, 2] - tb.Transform.GetMatrix()[3, 2]) * Transformation.ZIndexPercision);
+                }
+                else return 1;
+            }
+            else
+            {
+                return -1;
+            }
+        }
     }
 }
\ No newline at end of file