feat: player sight radius configuration and update related logic

BlazorRogue.Tests/ConfigurationTests.cs

@@ -411,6 +411,7 @@ public void ParseLoadsGameConfigDefaults()
         var configuration = ParseConfiguration();
 
         Assert.Equal(0, configuration.StartingLevelNumber);
+        Assert.Equal(12, configuration.PlayerSightRadius);
         Assert.False(configuration.DebugMode);
         Assert.Equal(-1002, configuration.DebugLevelNumber);
     }

Data/game-config.json

@@ -1,5 +1,6 @@
 {
   "starting_level": 0,
+  "player_sight_radius": 12,
   "debug_mode": false,
   "debug_level": -1002
 }

Entities/Configuration.cs

@@ -124,6 +124,16 @@ public LiquidType LiquidTypeById(string id) =>
     /// </summary>
     public int StartingLevelNumber { get; private set; } = DefaultStartingLevelNumber;
 
+    /// <summary>Player sight radius when <c>game-config.json</c> doesn't say otherwise.</summary>
+    internal const int DefaultPlayerSightRadius = 6;
+
+    /// <summary>
+    /// How many tiles the player can see (and wake monsters) around themselves, from
+    /// <c>Data/game-config.json</c>'s <c>player_sight_radius</c>. Defaults to
+    /// <see cref="DefaultPlayerSightRadius"/>; must be positive.
+    /// </summary>
+    public int PlayerSightRadius { get; private set; } = DefaultPlayerSightRadius;
+
     /// <summary>
     /// Initial value for <see cref="Game.DebugMode"/> (verbose combat rolls in the message log),
     /// from <c>Data/game-config.json</c>'s <c>debug_mode</c>. Defaults to <c>false</c>; toggle it
@@ -361,6 +371,16 @@ void ParseGameConfig(JsonDocumentOptions options)
         {
             StartingLevelNumber = RequireNonNullInt(startingLevelElement, "starting_level");
         }
+        if (root.TryGetProperty("player_sight_radius", out var sightRadiusElement))
+        {
+            PlayerSightRadius = RequireNonNullInt(sightRadiusElement, "player_sight_radius");
+            if (PlayerSightRadius < 1)
+            {
+                throw new InvalidOperationException(
+                    $"game-config.json 'player_sight_radius' must be positive, but is {PlayerSightRadius}."
+                );
+            }
+        }
         if (root.TryGetProperty("debug_mode", out var debugModeElement))
         {
             DebugMode = debugModeElement.GetBoolean();

Pages/GamePage.razor

@@ -624,8 +624,9 @@ else
         windowYOffset = Math.Clamp(optimalYOffset, 0, game.Map.Height - windowHeight);
 
         // optional: keep move buffer proportional after resize
-        windowMoveBufferX = Math.Min(Map.PlayerSightRadius + 1, Math.Max(1, windowWidth / 3));
-        windowMoveBufferY = Math.Min(Map.PlayerSightRadius + 1, Math.Max(1, windowHeight / 3));
+        int sightRadius = game.Configuration.PlayerSightRadius;
+        windowMoveBufferX = Math.Min(sightRadius + 1, Math.Max(1, windowWidth / 3));
+        windowMoveBufferY = Math.Min(sightRadius + 1, Math.Max(1, windowHeight / 3));
     }
 
     private async Task ToggleRenderMode()
@@ -850,8 +851,9 @@ else
     // guarded on `session is null` so neither is dereferenced before that.
     Game game = null!;
 
-    int windowMoveBufferX = Map.PlayerSightRadius + 1;
-    int windowMoveBufferY = Map.PlayerSightRadius + 1;
+    // Placeholders until FitMapToViewportAsync derives them from the configured sight radius.
+    int windowMoveBufferX = BlazorRogue.Entities.Configuration.DefaultPlayerSightRadius + 1;
+    int windowMoveBufferY = BlazorRogue.Entities.Configuration.DefaultPlayerSightRadius + 1;
 
     int windowWidth = 25;
     int windowHeight = 20;

World/Generation/FenceGalleryMapGenerator.cs

@@ -151,7 +151,7 @@ protected override Tuple<int, int> CreateLayout()
         // twice) for a fresh goblin and try approaching more directly.
         _ = AddMonsterAt(enclosureX0 + 2, enclosureY0 + 1, configuration.MonsterTypes["goblin"]);
 
-        // Sight radius is only Map.PlayerSightRadius (6) - too small to see the whole gallery from
+        // Sight radius is only game-config.json's player_sight_radius - may be too small to see the whole gallery from
         // one spot regardless, but this puts the swatch row mostly in view on arrival, with the
         // enclosure a short walk south.
         return Tuple.Create(8, 6);

World/Map.cs

@@ -22,8 +22,7 @@ class Map
     // Set via AddPlayer() shortly after Map construction (DungeonGenerator always calls it before
     // the map is used); null! avoids forcing nullable-checks on every consumer of this property.
     public Moveable Player { get; private set; } = null!;
-    public const int PlayerSightRadius = 6;
-    public const int PlayerSightRadiusSquared = PlayerSightRadius * PlayerSightRadius;
+    public int PlayerSightRadius => Game.Configuration.PlayerSightRadius;
 
     public List<string> DebugInfo = [];