ขอสคริป ระยะการมองเห็นกะสอนแก้ไขระยะ ทีครับ

Code:
#===============================================================================

# ■ Hero Detection

#-------------------------------------------------------------------------------

# ver 1.00 (15/11/2008) by Plugz

#-------------------------------------------------------------------------------



class Hero_Detection

   

   def initialize(event_id)

      @event_id = event_id

   end

   

   def distance(location = true)

      if location

         return (($game_player.x - $game_map.events[@event_id].x) ** 2 + ($game_player.y - $game_map.events[@event_id].y) ** 2).to_f ** 0.5

      else

         return ($game_player.x - $game_map.events[@event_id].x) ** 2 + ($game_player.y - $game_map.events[@event_id].y) ** 2

      end

   end

   

   def circle(r, switch = nil)

      r *= r

      if distance(false) <= r

         unless switch.nil?

            key = [$game_map.map_id, @event_id, switch]

            $game_self_switches[key] = true

            $game_map.events[@event_id].refresh

         end

         return true

      end

   end

   

   def eclipse(width, long, switch=nil)

      @x_event = $game_map.events[@event_id].x

      @y_event = $game_map.events[@event_id].y

      @x = $game_player.x

      @y = $game_player.y

      width = width.to_f/2

      long = long.to_f/2

      distance = (width**2-long**2).to_f**0.5

      @direction = $game_map.events[@event_id].direction

      

      if @direction == 2

         @x_foyer = @x_event

         @y_foyer = @y_event + distance * 2

      elsif @direction == 8

         @x_foyer = @x_event

         @y_foyer = @y_event - distance * 2

      elsif @direction == 4

         @x_foyer = @x_event - distance * 2

         @y_foyer = @y_event

      elsif @direction == 6

         @x_foyer = @x_event + distance * 2

         @y_foyer = @y_event

      end

      

      @equation = (((long ** 2 + distance ** 2).to_f ** 0.5) * 2).round

      @distance_hero = distance(true) + ((@x_foyer-@x) ** 2 + (@y_foyer-@y) ** 2).to_f ** 0.5

      @distance_hero = @distance_hero.round

      

      if @distance_hero <= @equation

         unless switch.nil?

            key = [$game_map.map_id, @event_id, switch]

            $game_self_switches[key] = true

            $game_map.events[@event_id].refresh

         end

         return true

      end

   end

   

end