Implement enemy AI and handler; add placeable radar object; enhance maze functionality

game/enemy/handler.rb

@@ -0,0 +1,28 @@
+require_relative 'base'
+
+class EnemyHandler
+  def initialize
+    @enemies = []
+  end
+
+  def update
+    spawn!
+    @enemies.each(&:update)
+  end
+
+  def spawn!
+    # For now, just spawn a single enemy at a fixed location
+    start_room_coords = $bus.get(:start_room_coords)
+    if @enemies.empty?
+      @enemies << Enemy.new((start_room_coords[0] + 4) * 60 + 30, (start_room_coords[1] + 4) * 60 + 30)
+    end
+  end
+
+  def draw
+    @enemies.each(&:draw)
+  end
+
+  def collides?(rect)
+    @enemies.any? { |enemy| enemy.collides?(rect) }
+  end
+end