Split of viewport code into its own Node

scene/GameScene.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=7 format=2]
+[gd_scene load_steps=8 format=2]
 
 [ext_resource path="res://scene/EscapeMenu.tscn" type="PackedScene" id=1]
 [ext_resource path="res://src/Cursor.cs" type="Script" id=2]
@@ -6,12 +6,18 @@
 [ext_resource path="res://gfx/cursor.png" type="Texture" id=4]
 [ext_resource path="res://scene/Player.tscn" type="PackedScene" id=5]
 [ext_resource path="res://scene/Block.tscn" type="PackedScene" id=6]
+[ext_resource path="res://src/Viewport.cs" type="Script" id=7]
 
 [node name="Game" type="Node"]
 script = ExtResource( 3 )
 Player = ExtResource( 5 )
 Block = ExtResource( 6 )
 
+[node name="Viewport" type="Node" parent="."]
+script = ExtResource( 7 )
+
+[node name="Network" type="Node" parent="."]
+
 [node name="HUD" type="CanvasLayer" parent="."]
 
 [node name="Cursor" type="Node2D" parent="HUD"]

src/Game.cs

@@ -1,42 +1,21 @@
 using Godot;
-using System;
 
 public class Game : Node
 {
-    [Export] public Vector2 PreferredScreenSize { get; set; } = new Vector2(640, 360);
+    [Export] public Vector2 RoomSize { get; set; } = new Vector2(32, 18) * 16;
 
     [Export] public PackedScene Player { get; set; }
     [Export] public PackedScene Block { get; set; }
 
     public override void _Ready()
     {
-        GetTree().Connect("screen_resized", this, "OnWindowResized");
-        OnWindowResized();
-
         SpawnPlayer();
         SpawnBlocks();
     }
 
-    private void OnWindowResized()
-    {
-        var viewport = GetViewport();
-
-        var scaleX = OS.WindowSize.x / PreferredScreenSize.x;
-        var scaleY = OS.WindowSize.y / PreferredScreenSize.y;
-        var scale  = Math.Max(1, Mathf.RoundToInt(Mathf.Min(scaleX, scaleY)));
-
-        viewport.Size = (OS.WindowSize / scale).Ceil();
-
-        // This prevents the viewport from being "squished" to fit the window.
-        // The difference is only a few pixels, but it results in distortion
-        // around the center horizontal and vertical lines of the screen.
-        viewport.SetAttachToScreenRect(new Rect2(0, 0, viewport.Size * scale));
-    }
-
     private void SpawnPlayer()
     {
         var player = (Player)Player.Instance();
-        player.Position = PreferredScreenSize / 2;
         AddChild(player);
     }
 
@@ -50,15 +29,15 @@ public class Game : Node
         }
 
         // Top and bottom.
-        for (var x = 16; x <= (int)PreferredScreenSize.x - 16; x += 16) {
+        for (var x = (int)RoomSize.x / -2; x <= (int)RoomSize.x / 2; x += 16) {
-            SpawnBlockAt(x, 20);
+            SpawnBlockAt(x, (int)RoomSize.y / -2);
-            SpawnBlockAt(x, (int)PreferredScreenSize.y - 20);
+            SpawnBlockAt(x, (int)RoomSize.y /  2);
         }
 
         // Left and right.
-        for (var y = 36; y <= (int)PreferredScreenSize.y - 36; y += 16) {
+        for (var y = (int)RoomSize.y / -2 + 16; y <= (int)RoomSize.y / 2 - 16; y += 16) {
-            SpawnBlockAt(16, y);
+            SpawnBlockAt((int)RoomSize.x / -2, y);
-            SpawnBlockAt((int)PreferredScreenSize.x - 16, y);
+            SpawnBlockAt((int)RoomSize.x /  2, y);
         }
     }
 }

src/Viewport.cs

@@ -0,0 +1,33 @@
+using Godot;
+using System;
+
+public class Viewport : Node
+{
+    [Export(PropertyHint.Range, "0,8")] public int Scale { get; set; } = 0;
+    [Export] public Vector2 PreferredScreenSize { get; set; } = new Vector2(640, 360);
+
+    public override void _Ready()
+    {
+        GetTree().Connect("screen_resized", this, "OnWindowResized");
+        OnWindowResized();
+    }
+
+    private void OnWindowResized()
+    {
+        var viewport = GetViewport();
+
+        var scale = Scale;
+        if (scale <= 0) {
+            var scaleX = OS.WindowSize.x / PreferredScreenSize.x;
+            var scaleY = OS.WindowSize.y / PreferredScreenSize.y;
+            scale      = Math.Max(1, Mathf.RoundToInt(Mathf.Min(scaleX, scaleY)));
+        }
+
+        viewport.Size = (OS.WindowSize / scale).Ceil();
+
+        // This prevents the viewport from being "squished" to fit the window.
+        // The difference is only a few pixels, but it results in distortion
+        // around the center horizontal and vertical lines of the screen.
+        viewport.SetAttachToScreenRect(new Rect2(0, 0, viewport.Size * scale));
+    }
+}