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

game/enemy/base.rb

@@ -0,0 +1,46 @@
+require_relative 'ai'
+
+class Enemy
+  attr_accessor :x, :y, :w, :h
+
+  def initialize(x, y)
+    @x = x
+    @y = y
+    @w = 25
+    @h = 30
+
+    @ai = EnemyAI.new(self, :chase)
+  end
+
+  def rect
+    [@x - @w / 2, @y - @h / 2, @w, @h]
+  end
+
+  def collides?(rect)
+    return true if intersects?(self.rect, rect)
+    false
+  end
+
+  def update
+    player_pos = $bus.get(:player_position)
+    @ai.update(*player_pos) if player_pos
+  end
+
+  def draw
+    cam_x, cam_y = $bus.get(:camera_pos) || [0, 0]
+
+    screen_x = @x - cam_x
+    screen_y = @y - cam_y
+
+    Gosu.draw_rect(
+      screen_x - @w / 2,
+      screen_y - @h / 2,
+      @w,
+      @h,
+      Gosu::Color::RED,
+      screen_y - @h / 2
+    )
+
+    @ai.draw
+  end
+end