added simple sleep state for elements

refactoring

Scripts/Elements/Element.cs

@@ -7,15 +7,19 @@ public class Element {
 
     public Vector2I Position;
     public int Density;
+    public int LastUpdate = -1;
+    public int LastMove = 0;
 
     public int DiffuseSpeed = 10;
     public const int MAX_DIFFUSE_SPEED = 100;
+    public const int STEPS_UNTIL_INACTIVE = 100;
 
     protected const float MAX_COLOR_VARIANCE = 0.1f;
     protected static readonly Vector2I VERTICAL_OPPOSITE = new Vector2I(-1, 1);
     protected readonly Level Level;
 
-    private int lastUpdate = -1;
+    private bool active = true;
+    private Color originalColor;
 
     public Element(Element e) {
         Position = e.Position;
@@ -28,14 +32,28 @@ public class Element {
         Level = level;
     }
 
+    public bool Active {
+        get => active;
+        set {
+            active = value;
+
+            if (active)
+                Color = originalColor;
+            else if (Main.Instance.DebugVisualization)
+                Color = new Color(0.2f, 0.2f, 0.2f);
+        }
+    }
+
     /// <summary>
     /// base update method, checks if anything is to do at all
     /// </summary>
     /// <param name="currentFrame"></param>
     /// <returns>false if there is nothing to do</returns>
     public virtual bool Update(int currentFrame) {
-        if (lastUpdate == currentFrame) return false; // already updated this frame
-        lastUpdate = currentFrame;
+        if (!Active) return false;
+
+        if (LastUpdate == currentFrame) return false; // already updated this frame
+        LastUpdate = currentFrame;
 
         return true;
     }
@@ -74,6 +92,8 @@ public class Element {
         c.R += (GD.Randf() - 1) * MAX_COLOR_VARIANCE;
         c.G += (GD.Randf() - 1) * MAX_COLOR_VARIANCE;
         c.B += (GD.Randf() - 1) * MAX_COLOR_VARIANCE;
+
+        originalColor = c;
         return c;
     }