Refactor props handling and inventory logic; add ghost prop preview

game/props/handler.rb

@@ -58,8 +58,7 @@ class PropsHandler
       [start_room_x + 2, start_room_y + 2]
     ].sample
     chest = Chest.new(x, y)
-    @props << chest
-    @grid[[x, y]] = chest
+    add(chest)
   end
 
   def nearby_props(rect)
@@ -84,9 +83,7 @@ class PropsHandler
 
   def add(prop)
     @props << prop
-
-    key = [prop.x, prop.y]
-    @grid[key] = prop
+    @grid[[prop.x, prop.y]] = prop
   end
 
   def update(dt)
@@ -97,10 +94,59 @@ class PropsHandler
         @grid.delete([prop.x, prop.y])
       end
     end
+    if Gosu.button_down?(Gosu::KB_P) # place selected if it is a placeable item
+      selected_item = $bus.get(:selected_item)
+      if selected_item == :torch
+        player_x, player_y = $bus.get(:player_position) || [0, 0]
+        tile = [(player_x - 90) / 120, (player_y - 90) / 120].map(&:round)
+        torch = Torch.new(*tile)
+        return if @grid[[tile[0], tile[1]]] # can't place if something is already there
+        return if $bus.get_all(:collides?, torch.rect).include?(:character) # can't place if colliding with player
+        return unless $bus.get(:consume, :torch, 1)
+        add(torch)
+      elsif selected_item == :radar
+        player_x, player_y = $bus.get(:player_position) || [0, 0]
+        tile = [(player_x - 90) / 120, (player_y - 90) / 120].map(&:round)
+        radar = Radar.new(*tile)
+        return if @grid[[tile[0], tile[1]]]
+        return if $bus.get_all(:collides?, radar.rect).include?(:character)
+        return unless $bus.get(:consume, :radar, 1)
+        add(radar)
+      end
+    end
+  end
+
+  def button_down(id, pos)
+    #
   end
 
   def draw
     cam = $bus.get(:camera_pos) || [0, 0]
     nearby_props([*cam, *SCREEN_SIZE]).each(&:draw)
+    draw_ghost_prop!
+  end
+
+  def draw_ghost_prop!
+    # draw a ghost of the prop that would be placed if the player presses the place button,
+    # to give them a preview of where it would go, also tint it red if it can't be placed there for any reason
+    # or green if it can
+    selected_item = $bus.get(:selected_item)
+    return unless [:torch, :radar].include?(selected_item)
+    cam_x, cam_y = $bus.get(:camera_pos) || [0, 0]
+    player_x, player_y = $bus.get(:player_position) || [0, 0]
+    x, y = [(player_x - 90) / 120, (player_y - 90) / 120].map(&:round)
+    return if @grid[[x, y]]
+    return if $bus.get(:count, selected_item) < 1
+    world_x = x * 120 + 90
+    world_y = y * 120 + 90
+    screen_x = world_x - cam_x
+    screen_y = world_y - cam_y
+    possible = !$bus.get_all(:collides?, [world_x - 20, world_y - 20, 40, 40]).include?(:character)
+    color = possible ? Gosu::Color.new(255 * 0.7, 128, 239, 128) : Gosu::Color.new(255 * 0.7, 255, 116, 108)
+    if selected_item == :torch
+      Torch.ghost.draw(screen_x - 20, screen_y - 20, screen_y, 2, 2, color)
+    elsif selected_item == :radar
+      Radar.ghost.draw(screen_x - 20, screen_y - 20, screen_y, 2, 2, color)
+    end
   end
 end