added simple activeElements list

Scenes/main.tscn

@@ -6,9 +6,7 @@
 
 [node name="Main" type="Node2D"]
 script = ExtResource("1_k1i8e")
-DebugVisualization = true
 BrushSize = 2
-TextureResolution = 0.35
 
 [node name="CanvasLayer" type="CanvasLayer" parent="."]
 

Scripts/Chunk.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using FOU.Scripts.Elements;
 using Godot;
 
@@ -15,6 +16,7 @@ public class Chunk {
     private readonly Image image;
     private readonly int sizeX;
     private readonly int sizeY;
+    private readonly List<Element> activeElements = new List<Element>();
 
     public Chunk(int x, int y, int index) {
         Index = index;
@@ -33,11 +35,14 @@ public class Chunk {
     }
 
     public void Update() {
-        for (int x = 0; x < sizeX; x++) {
+        // for (int x = 0; x < sizeX; x++) {
-            for (int y = 0; y < sizeY; y++) {
+        //     for (int y = 0; y < sizeY; y++) {
-                if (Elements[x,y] != null)
+        //         if (Elements[x,y] != null)
-                    Elements[x,y].Update();
+        //             Elements[x,y].Update();
-            }
+        //     }
+        // }
+        foreach (Element e in activeElements) {
+            e.Update();
         }
     }
 
@@ -52,12 +57,15 @@ public class Chunk {
                 int Y = Mathf.Clamp(y + j, 0, sizeY-1);
                 object o = Activator.CreateInstance(type, X, Y, this);
 
-                if (Elements[X,Y].GetType() != type)
+                if (Elements[X,Y].GetType() != type) {
                     Elements[X, Y] = o as Element;
+                    activeElements.Add(Elements[X, Y]);
+                }
             }
         }
     }
 
+    // TODO: use this function and stitch together partial images in Level
     public Image DrawLevel() {
         for (int x = 0; x < sizeX; x++) {
             for (int y = 0; y < sizeY; y++) {
@@ -67,6 +75,15 @@ public class Chunk {
         return image;
     }
 
+    public void SetElementActive(Element e, bool active) {
+        if (e.Active == active) return;
+
+        if (active)
+            activeElements.Add(e);
+        else
+            activeElements.Remove(e);
+    }
+
     public void Swap(Element what, Vector2I pos) {
         Swap(what, Get(pos));
     }

Scripts/Elements/Element.cs

@@ -38,6 +38,7 @@ public class Element {
         get => active;
         set {
             active = value;
+            Chunk.SetElementActive(this, active);
 
             if (active)
                 Color = originalColor;
@@ -98,5 +99,4 @@ public class Element {
         originalColor = c;
         return c;
     }
-
 }