extract segments

lib/centipede/enemy/segment.rb

@@ -0,0 +1,56 @@
+class Enemy::Segment < Enemy
+
+    has_score 10
+
+    def self.segment_tiles(window)
+      @segment_tiles ||= Gosu::Image.load_tiles(window, File.join(GAME_DIR, 'images', 'centipede', 'body.png'), 7, 8, true)
+    end
+
+    attr_accessor :segment
+
+    def initialize(window, owner, sx, sy)
+      super(window, sx, sy)
+      self.x = sx
+      self.y = sy
+      self.segment = Segment.segment_tiles(window)
+      self.moving_right = true
+      @current_frame = 0
+    end
+
+    def draw
+      self.segment[@current_frame].draw(x, y, Z_ORDER, 2, 2)
+      @current_frame += 1
+      if @current_frame >= self.segment.size
+        @current_frame = 0
+      end
+    end
+
+    def update(time)
+
+    end
+
+    include Enemy::Movement
+
+    def forced_move(dir)
+      check_method = "can_move_#{dir}?".to_sym
+      move_method = :"move_#{dir}"
+      if self.send check_method
+        self.send move_method
+      else
+        self.move_down
+      end
+    end
+
+    def head_moved(dir)
+      case dir
+      when :right
+        self.forced_move((self.moving_left?) ? :left : :right)                
+      else
+        self.forced_move((self.moving_right?) ? :right : :left)        
+      end
+    end
+
+  end
+
+
+