Refactor event bus to use non-retrievable events;

update collision handling and add new inventory initialization;
add torch lighting in fog shader;

game/character.rb

@@ -37,9 +37,13 @@ class Character
     @current_animation = :idle_front
     @facing = :front
 
-    $bus.on_retrievable(:player_position) do
+    $bus.on(:player_position) do
       next [@world_x, @world_y]
     end
+
+    $bus.on(:collides?) do |rect|
+      next collides?(rect) ? :character : nil
+    end
   end
 
   def rect
@@ -95,13 +99,13 @@ class Character
     steps.times do
       # X axis
       @world_x += step_dx
-      if ($bus.get(:collides?, rect) & [:wall, :object])&.any?
+      if ($bus.get_all(:collides?, rect) & [:wall, :object])&.any?
         @world_x -= step_dx
       end
 
       # Y axis
       @world_y += step_dy
-      if ($bus.get(:collides?, rect) & [:wall, :object])&.any?
+      if ($bus.get_all(:collides?, rect) & [:wall, :object])&.any?
         @world_y -= step_dy
       end
     end

game/enemy/ai.rb

@@ -19,7 +19,7 @@ class EnemyAI
     player_tile = [(player_x - 90) / 120, (player_y - 90) / 120].map(&:round)
     enemy_tile  = [(@enemy.x - 90) / 120, (@enemy.y - 90) / 120].map(&:round)
 
-    return if $bus.get(:collides?, @enemy.rect)&.include?(:character)
+    return if $bus.get_all(:collides?, @enemy.rect)&.include?(:character)
 
     object_in_tile = $bus.get(:object_at, enemy_tile[0], enemy_tile[1])
 
@@ -134,7 +134,7 @@ class EnemyAI
     @enemy.x += dx
     @enemy.y += dy
 
-    if $bus.get(:collides?, @enemy.rect)&.include?(:character)
+    if $bus.get_all(:collides?, @enemy.rect)&.include?(:character)
       # Attack player
     end
   end

game/enemy/base.rb

@@ -10,6 +10,10 @@ class Enemy
     @h = 30
 
     @ai = EnemyAI.new(self, :chase)
+
+    $bus.on(:collides?) do |rect|
+      next collides?(rect) ? :enemy : nil
+    end
   end
 
   def rect

game/maze.rb

@@ -6,9 +6,13 @@ class Maze
     @spritesheet = Gosu::Image.load_tiles("assets/images/walls.png", 20, 40, retro: true)
     puts @spritesheet.size
 
-    $bus.on_retrievable(:maze_solve) do |x1, y1, x2, y2|
+    $bus.on(:maze_solve) do |x1, y1, x2, y2|
       next @maze.solve(x1, y1, x2, y2)
     end
+
+    $bus.on(:collides?) do |rect|
+      next collides?(rect) ? :wall : nil
+    end
   end
 
   def collides?(rect)

game/placeables/base.rb

@@ -12,6 +12,14 @@ class Placeable
     @y = y
     @frames_count = 0
     @spritesheet = nil
+
+    $bus.on(:object_at) do |x, y|
+      next @x == x && @y == y ? self : nil
+    end
+
+    $bus.on(:collides?) do |rect|
+      next collides?(rect) ? :object : nil
+    end
   end
 
   def collides?(rect)
@@ -54,26 +62,42 @@ class Radar < Placeable
   end
 end
 
+class Torch < Placeable
+  def initialize(x, y)
+    super(x, y)
+    @frames_count = 4
+    @spritesheet = Gosu::Image.load_tiles("assets/images/torch.png", 20, 20, retro: true)
+
+    $bus.on(:torch_position) do
+      next rect
+    end
+  end
+end
+
+class Chest < Placeable
+  def initialize(x, y)
+    super(x, y)
+    @frames_count = 1
+    @spritesheet = Gosu::Image.load_tiles("assets/images/chest.png", 20, 20, retro: true)
+  end
+end
+
 class ObjectHandler
   attr_reader :objects
 
   def initialize
     start_room_coords = $bus.get(:start_room_coords)
-    @objects = [Radar.new(start_room_coords[0] / 2 - 1, start_room_coords[1] / 2 - 1)]
-
-    $bus.on_retrievable(:object_at) do |x, y|
-      next @objects.find { |obj| obj.x == x && obj.y == y }
-    end
+    @objects = [
+      Torch.new(start_room_coords[0] / 2 - 1, start_room_coords[1] / 2 - 1),
+      Torch.new(start_room_coords[0] / 2 + 3, start_room_coords[1] / 2),
+      Torch.new(start_room_coords[0] / 2, start_room_coords[1] / 2 - 1),
+    ]
   end
 
   def add(object)
     @objects << object
   end
 
-  def collides?(rect)
-    @objects.any? { |obj| obj.collides?(rect) }
-  end
-
   def update
     @objects.each(&:update)
   end

game/scene.rb

@@ -27,18 +27,9 @@ class Game < Scene
       @camera = pos
     end
 
-    $bus.on_retrievable(:camera_pos) do
+    $bus.on(:camera_pos) do
       next @camera
     end
-
-    $bus.on_retrievable(:collides?) do |rect|
-      collisions = []
-      collisions << :wall if @maze.collides?(rect)
-      collisions << :character if @character.collides?(rect)
-      collisions << :enemy if @enemies.collides?(rect)
-      collisions << :object if @objects.collides?(rect)
-      next collisions
-    end
   end
 
   def draw
@@ -74,13 +65,19 @@ class Game < Scene
   def draw_fog!
     cam_x, cam_y = @camera
     cell = 10
-    i_radius = 90.0
-    o_radius = 400.0
+    p_i_radius = 80.0
+    p_o_radius = 350.0
+    t_i_radius = 10.0
+    o_radius = 160.0
 
     # Player screen position
     px = SCREEN_SIZE[0] / 2.0
     py = SCREEN_SIZE[1] / 2.0
 
+    # Collect all light sources (player + torches)
+    torches = $bus.get_all(:torch_position)
+    torch_lights = torches.map { |t| [t[0] - cam_x, t[1] - cam_y] }
+
     tiles_x = (SCREEN_SIZE[0] / cell) + 2
     tiles_y = (SCREEN_SIZE[1] / cell) + 2
 
@@ -89,21 +86,44 @@ class Game < Scene
         sx = i * cell
         sy = j * cell
 
-        dist = Math.sqrt((sx - px)**2 + (sy - py)**2)
+        light_strength = 0.0
 
-        if dist < i_radius
-          next  # fully clear
-        elsif dist > o_radius
-          alpha = 255
+        d = Math.sqrt((px - sx)**2 + (py - sy)**2)
+        if d < p_i_radius
+          light_strength = 1.0
+        elsif d < p_o_radius
+          t = (d - p_i_radius) / (p_o_radius - p_i_radius) # 0..1
+          light_strength = 1.0 - t
+        end
+
+        torch_lights.each do |lx, ly|
+          d = Math.sqrt((sx - lx)**2 + (sy - ly)**2)
+
+          if d < t_i_radius
+            strength = 1.0
+          elsif d < o_radius
+            t = (d - t_i_radius) / (o_radius - t_i_radius) # 0..1
+            strength = 1.0 - t
           else
-          t = (dist - i_radius) / (o_radius - i_radius)  # 0..1
+            strength = 0.0
+          end
+
+          light_strength += strength
+        end
+
+        light_strength = light_strength.clamp(0.0, 1.0)
+
+        t = 1.0 - light_strength
+
         world_x = (sx + cam_x) * 0.005
         world_y = (sy + cam_y) * 0.005
-          # Sample noise at world position so it scrolls with camera
-          # Add time-based offsets for animation
-          noise = (@noise[world_x + Gosu.milliseconds / 5000.0, world_y + Gosu.milliseconds / 6000.0] + 1.0) / 2.0
+
+        noise = (@noise[
+          world_x + Gosu.milliseconds / 5000.0,
+          world_y + Gosu.milliseconds / 6000.0
+        ] + 1.0) / 2.0
+
         alpha = (t * (1.0 + noise) * 255).to_i.clamp(0, 255)
-        end
 
         Gosu.draw_rect(sx, sy, cell, cell, Gosu::Color.new(alpha, 0, 0, 0), 10000 + sy)
       end

game/state.rb

@@ -4,4 +4,35 @@ class State
   # also their health, stealth, and memory bars
   # it can handle mouse input for inventory management and item usage
   # it can also handle keyboard input for quick item usage
+
+  def initialize
+    @inventory = {
+      # basic resources
+      :wood => 0,
+      :metal => 0,
+      :science => 0,
+
+      # nuetrals
+      :torch => 0,
+      :radar => 0,
+
+      # placeable weapons
+      :landmine => 0,
+      :shrodingers_mine => 0,
+      :event_horizon => 0,
+
+      # attack weapons
+      :occams_razor => 0,
+      :quantum_bow => 0,
+      :blade_of_recursion => 0,
+
+      # utility weapon
+      :lorentz_field => 0
+    }
+    @inventory_selected = :wood
+    @upgrades = []
+    @health = 100
+    @stealth = 100
+    @memory = 256
+  end
 end

main.rb

@@ -20,7 +20,7 @@ class Window < Gosu::Window
 
     $bus.on(:quit_game) { close! }
 
-    $bus.on_retrievable(:mouse_pos) do
+    $bus.on(:mouse_pos) do
       next mouse_relative(mouse_x, mouse_y)
     end
 

utils/bus.rb

@@ -2,12 +2,11 @@ class EventBus
   def initialize
     # store callbacks with owner: {event => [ {callback:, owner:} ] }
     @events = Hash.new { |h, k| h[k] = [] }
-    @retrievable_events = {}
   end
 
   # Emit an event
   def emit(event, *args)
-    @events[event].each do |h|
+    @events[event].dup.each do |h|
       h[:callback].call(*args)
     end
   end
@@ -28,30 +27,34 @@ class EventBus
     on(event, owner: owner, &wrapper)
   end
 
+  # Unsubscribe from an event
   def off(event, &callback)
     @events[event].reject! { |h| h[:callback] == callback }
   end
 
-  # Register a retrievable event (only one allowed)
-  def on_retrievable(event, owner = nil, &callback)
-    owner ||= callback.binding.eval("self")
-    @retrievable_events[event] = { callback: callback, owner: owner }
-  end
-
-  # Get data from a retrievable event
+  # For events that return a value (e.g. queries), get the first non-nil response
   def get(event, *args)
-    if @retrievable_events[event]
-      @retrievable_events[event][:callback].call(*args)
-    else
+    @events[event].dup.each do |h|
+      result = h[:callback].call(*args)
+      return result unless result.nil?
+    end
     nil
   end
+
+  # For events that return multiple values (e.g. queries), get all non-nil responses
+  def get_all(event, *args)
+    results = []
+    @events[event].dup.each do |h|
+      result = h[:callback].call(*args)
+      results << result unless result.nil?
+    end
+    results
   end
 
-  # Unsubscribe from an object's events
-  def unlisten_owner(owner)
+  # Unsubscribe all events for a given owner (e.g. when an object is destroyed)
+  def remove_owner(owner)
     @events.each do |event, handlers|
       handlers.reject! { |h| h[:owner] == owner }
     end
-    @retrievable_events.delete_if { |_, h| h[:owner] == owner }
   end
 end

utils/maze.rb

@@ -15,14 +15,14 @@ class MazeData
 
     return if standalone
 
-    $bus.on_retrievable(:start_room_coords) do
+    $bus.on(:start_room_coords) do
       next @start_room ? [@start_room[0] * 2 + 1, @start_room[1] * 2 + 1] : nil
     end
 
     return unless DEBUG
 
     print_debug
-    $bus.on_retrievable(:boss_room_coords) do
+    $bus.on(:boss_room_coords) do
       next @boss_rooms.first ? [@boss_rooms.first[0] * 2 + 1, @boss_rooms.first[1] * 2 + 1] : nil
     end
   end

utils/scene.rb

@@ -14,6 +14,6 @@ class Scene
   end
 
   def close
-    $bus.unlisten_owner(self)
+    $bus.remove_owner(self)
   end
 end