Enhance enemy AI and introduce Force class: update speed dynamics based on Lorentz field effects, refactor enemy spawning to utilize Force, and add sprite loading for Force.

game/enemy/base.rb

@@ -3,6 +3,23 @@ require_relative 'ai'
 class Enemy
   attr_accessor :x, :y, :w, :h
 
+  def self.load(path, w, h, s)
+    # Once artwork is done need to load each animation here.
+    # But as artwork takes time, for now just load a single image.
+    @sprite = Gosu::Image.new(path, retro: true)
+    @i_w = w
+    @i_h = h
+    @s = s
+  end
+
+  def self.sprite
+    @sprite
+  end
+
+  def self.frame_size
+    [@i_w, @i_h, @s]
+  end
+
   def initialize(x, y)
     @x = x
     @y = y
@@ -36,15 +53,17 @@ class Enemy
     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
+
+    self.class.sprite.draw(
+      screen_x - self.class.frame_size[0],
+      screen_y - self.class.frame_size[1],
+      screen_y - self.class.frame_size[1],
+      self.class.frame_size[2],
+      self.class.frame_size[2]
     )
 
+    Gosu.draw_rect(screen_x - @w / 2, screen_y - @h / 2, @w, @h, Gosu::Color.new(0x40FF0000), Float::INFINITY) if $bus.get(:settings, :debug)
+
     @ai.draw
   end
 end