fixed stuck rain

refactoring

Scenes/main.tscn

@@ -9,7 +9,6 @@
 script = ExtResource("1_k1i8e")
 DebugMode = true
 BrushSize = 4
-RainAmount = 1.0
 
 [node name="CanvasLayer" type="CanvasLayer" parent="."]
 

Scripts/Chunk.cs

@@ -77,7 +77,7 @@ public class Chunk {
         object o = Activator.CreateInstance(type, x, y, this);
 
         // check if not empty and overwrite not allowed:
-        if (Elements[x,y].GetType() != typeof(Element) && !Main.Instance.AllowOverwrite) {
+        if (!Elements[x,y].IsEmpty() && !Main.Instance.AllowOverwrite) {
             return;
         }
 

Scripts/Elements/Element.cs

@@ -32,8 +32,7 @@ public class Element{
         Position.X = x;
         Position.Y = y;
         Chunk = chunk;
-        lastMove = Engine.GetFramesDrawn();
+        Active = true;
-        Active = false;
     }
 
     public bool Active {
@@ -43,6 +42,8 @@ public class Element{
 
             active = value;
             Chunk.SetElementActive(this, value);
+            lastMove = Engine.GetFramesDrawn();
+
             if (!active)
                 ResetColor();
             else
@@ -93,6 +94,7 @@ public class Element{
             Chunk.Swap(this, Position + Vector2I.Down);
     }
 
+    /// <returns>-1, 0 or 1</returns>
     protected Vector2I RandomDirectionDown() {
         int randomDirection = GD.Randi() % 2 != 0 ? 1 : -1;
 
@@ -133,4 +135,8 @@ public class Element{
     public void MarkForUpdate(bool mark = true) {
         markedForUpdate = true;
     }
+
+    public bool IsEmpty() {
+        return GetType() == typeof(Element);
+    }
 }

Scripts/Level.cs

@@ -84,8 +84,11 @@ public class Level {
         int rainDrops = (int)Math.Round(rainAmount);
 
         for (int i = 0; i <= rainDrops; i++) {
-            if (GD.Randf() < rainAmount)
+            if (GD.Randf() < rainAmount) {
-                WritePixel<Water>((int)(GD.Randi() % (chunkResX * chunksPerX)), 0, 1);
+                int d = (int)(GD.Randi() % (chunkResX * chunksPerX));
+                if (GetElement(d, 0).IsEmpty())
+                    WritePixel<Water>(d, 0, 1);
+            }
         }
     }
 
@@ -145,6 +148,13 @@ public class Level {
         }
     }
 
+    public Element GetElement(int x, int y) {
+        if (x < 0 || x > chunkResX * chunkResX) return null;
+        if (y < 0 || y > chunkResY * chunkResY) return null;
+
+        return chunks[x / chunkResX, y / chunkResY].Elements[x % chunkResX, y % chunkResY];
+    }
+
     public Image DrawLevel() {
         // chunk
         for (int cx = 0; cx < chunksPerX; cx++) {