if true # << Make true to use this script, false to disable.
#===============================================================================
#
#  Trainer Sensor Script
#  Author     : Drimer
#
#===============================================================================

#===============================================================================
#                             **  Settings here! **
#
# RANGE sets the... range of detection! If it is set to 0 it will take the
# value x from 'Trainer(x)' (Event's name!)
#
# BAR_OPACITY is used to set the transparency to the focus bars.
#
# SELF_SWITCH is used to identify those trainers you already fought against of.
#
# BAR_HEIGHT sets the the focus bars' height value.
#
# BAR_GRAPHIC allows you to load your own graphic from 'Graphics/Pictures/'
# if it is set to "" or nil, the system will create them for you. If not, then
# the BAR_HEIGHT will be ignored as well as the BAR_OPACITY constant.
#===============================================================================
module TrainerSensor
  RANGE       = 0
  BAR_OPACITY = 255/2
  SELF_SWITCH = "A"
  BAR_HEIGHT  = Graphics.height/6
  BAR_GRAPHIC = ""
  # If you use EBS, a good option is set this value to "EBS/newBattleMessageBox"
end
  

#===============================================================================
# **  
#===============================================================================
module TrainerSensor
  @top = Sprite.new
  @top.z = 1
  @bottom = Sprite.new
  @bottom.z = 1
  @triggered = false
  @custom_graphic = false
  @created = false
  
  def self.create
    if ["", nil].include?(BAR_GRAPHIC)
      @top.bitmap = Bitmap.new(Graphics.width, BAR_HEIGHT)
      @top.bitmap.fill_rect(0,0,@top.bitmap.width,@top.bitmap.height,
        Color.new(-255,-255,-255, BAR_OPACITY))
    else
      @top.bitmap = BitmapCache.load_bitmap("Graphics/Pictures/#{BAR_GRAPHIC}")
      @top.ox = @top.bitmap.width/2
      @top.x = Graphics.width/2
      @top.y = -@top.bitmap.height
      @top.mirror = true
      @top.angle = 180
      @custom_graphic = true
    end
    @top.oy = @top.bitmap.height
    @bottom.bitmap = @top.bitmap.clone
    if @custom_graphic
      @bottom.ox = @bottom.bitmap.width/2
      @bottom.x = Graphics.width/2
    end
    @bottom.y = Graphics.height
    @created = true
  end
  
  def self.triggered?
    @triggered
  end
  
  def self.show
    self.create if !@created
    @triggered = true
  end
  
  def self.hide
    @triggered = false
  end
  
  def self.update
    return if !@created
    if @triggered
      if @top.y < (@custom_graphic ? 0 : (BAR_HEIGHT - 6) )
        @top.y += 6
        @bottom.y -= 6
      end
    else
      if @top.y > (@custom_graphic ? -@top.bitmap.height : 0 )
        @top.y -= 6
        @bottom.y += 6
      end    
    end
  end
  
  # Function to check if the player is in an event's range
  def self.InRange?(event, distance)
    distance = RANGE > 0 ? RANGE : distance
    return false if distance<=0
    rad = (Math.hypot((event.x - $game_player.x),(event.y - $game_player.y))).abs
    return true if (rad <= distance)
    return false
  end
end

module Graphics
  class << self
    alias trainer_detection_update update
    def update
      trainer_detection_update
      TrainerSensor.update if $scene && $scene.is_a?(Scene_Map)
    end
  end
end

# Change it to Events.StepTaken if you want this to scan the events on each step
# the player gives.
Events.onMapUpdate+=proc(){
  for event in $game_map.events.values
    if event.name[/^Trainer\((\d+)\)$/] && event.isOff?(TrainerSensor::SELF_SWITCH)
      distance=$~[1].to_i
      if TrainerSensor.InRange?(event, distance)
        TrainerSensor.show()
        break
      else
        TrainerSensor.hide() if TrainerSensor.triggered?
      end
    else
      TrainerSensor.hide() if TrainerSensor.triggered?
    end
  end
}

end # if