#===============================================================================
# Walking charset, for use in text entry screens and load game screen
#===============================================================================
class TrainerWalkingCharSprite < Sprite
  def initialize(charset, viewport = nil)
    super(viewport)
    @animbitmap = nil
    self.charset = charset
    @animframe      = 0   # Current pattern
    @frame          = 0   # Frame counter
    self.animspeed  = 5   # Animation speed (frames per pattern)
  end

  def charset=(value)
    @animbitmap&.dispose
    @animbitmap = nil
    bitmapFileName = sprintf("Graphics/Characters/%s", value)
    @charset = pbResolveBitmap(bitmapFileName)
    if @charset
      @animbitmap = AnimatedBitmap.new(@charset)
      self.bitmap = @animbitmap.bitmap
      self.src_rect.set(0, 0, self.bitmap.width / 4, self.bitmap.height / 4)
    else
      self.bitmap = nil
    end
  end

  def altcharset=(value)   # Used for box icon in the naming screen
    @animbitmap&.dispose
    @animbitmap = nil
    @charset = pbResolveBitmap(value)
    if @charset
      @animbitmap = AnimatedBitmap.new(@charset)
      self.bitmap = @animbitmap.bitmap
      self.src_rect.set(0, 0, self.bitmap.width / 4, self.bitmap.height)
    else
      self.bitmap = nil
    end
  end

  def animspeed=(value)
    @frameskip = value * Graphics.frame_rate / 40
  end

  def dispose
    @animbitmap&.dispose
    super
  end

  def update
    @updating = true
    super
    if @animbitmap
      @animbitmap.update
      self.bitmap = @animbitmap.bitmap
    end
    @frame += 1
    if @frame >= @frameskip
      @animframe = (@animframe + 1) % 4
      self.src_rect.x = @animframe * @animbitmap.bitmap.width / 4
      @frame -= @frameskip
    end
    @updating = false
  end
end