hierarchy rework

fixed swap

Scripts/Level.cs

@@ -46,7 +46,7 @@ public class Level {
 
     private void MakeItRain(float rainAmount) {
         if (GD.Randf() < rainAmount) {
-            WritePixel<Snow>((int)(GD.Randi() % SizeX), 0, 1);
+            WritePixel<Water>((int)(GD.Randi() % SizeX), 0, 1);
         }
     }
 
@@ -69,20 +69,25 @@ public class Level {
     public Image DrawLevel() {
         for (int x = 0; x < SizeX; x++) {
             for (int y = 0; y < SizeY; y++) {
-                // if (_elements[x,y] == null) continue;
-
                 mImage.SetPixel(x,y, _elements[x,y].Color);
             }
         }
         return mImage;
     }
 
-    public void Swap(Element what, Vector2I swapTo) {
-        Element old = Get(swapTo);
-        Set(old, what.Position);
-        Set(what, swapTo);
+    public void Swap(Element what, Element swapTo) {
+        Element swap = new Element(what);
+
+        what.Position = swapTo.Position;
+        _elements[swapTo.Position.X, swapTo.Position.Y] = what;
+
+        swapTo.Position = swap.Position;
+        _elements[swap.Position.X, swap.Position.Y] = swapTo;
     }
 
+    public void Swap(Element what, Vector2I pos) {
+        Swap(what, Get(pos));
+    }
 
     public Element Get(Vector2I where) {
         if (where.X < 0 || where.X >= SizeX) return null;
@@ -98,10 +103,10 @@ public class Level {
         return _elements[x,y];
     }
 
-    private void Set(Element what, Vector2I where) {
-        if (what == null) return;
+    public bool IsEmpty(Vector2I pos) {
+        if (pos.X < 0 || pos.X >= SizeX) return false;
+        if (pos.Y < 0 || pos.Y >= SizeY) return false;
 
-        what.Position = where;
-        _elements[where.X, where.Y] = what;
+        return Get(pos).GetType() == typeof(Element);
     }
 }