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# File 'bgatari.rb', line 223

def check_bg_hit(x, y, dir = ADJUST_NONE, floor_only = false)
  @continue_tile = false
  x = x.to_i
  y = y.to_i
  hx = x % @map_width
  hy = y % @map_height
  tx = (hx / @tilewidth).to_i
  ty = (hy / @tileheight).to_i
  code = @mapdata[ty][tx]

  # �Ō�ɓ�������BG�A�^���ԍ��������L�^�����ق���������������Ȃ��c�H
  @bg_code = code if code != @nullcode
  # @bg_code = code

  return nil if code == @nullcode

  unless floor_only
    # �Ԃ牺����_�Ȃǂ́A�����R�[�h�Ƃ��Ĉ���
    return nil if @no_floor_start <= code and code <= @no_floor_end
  end

  ymin, ymax = @atari_tbls[code][0][hx % tilewidth]
  return nil if ymin == nil or ymax == nil
  chky = hy % tileheight
  return nil if chky < ymin or ymax < chky

  case dir
  when ADJUST_NONE
    # �������Ă邱�Ƃ�����Ԃ�
    return true

  when ADJUST_UP
    # ������ւ̕␳�l��Ԃ�
    hosei = ymin - chky - 1
    @adjust_x = x
    @adjust_y = y + hosei
    @continue_tile = true if ymin == 0
    return hosei

  when ADJUST_DOWN
    # �������ւ̕␳�l��Ԃ�
    hosei = ymax - chky + 1
    @adjust_x = x
    @adjust_y = y + hosei
    @continue_tile = true if ymax == (@tileheight - 1)
    return hosei

  else
    # ���A�������͉E�����ւ̕␳�l��Ԃ�
    xmin, xmax = @atari_tbls[code][1][hy % tileheight]
    return nil if xmin == nil or xmax == nil
    chkx = hx % tilewidth

    # �{���A�ȉ��̏�������͐������Ȃ��͂������c�O�̂��߂ɓ���Ă����B
    # �����ł������𑬂��������Ȃ�R�����g�A�E�g
    return nil if chkx < xmin or xmax < chkx

    case dir
    when ADJUST_LEFT
      # �������ւ̕␳�l��Ԃ�
      hosei = xmin - chkx - 1
      @adjust_x = x + hosei
      @adjust_y = y
      @continue_tile = true if xmin == 0
      return hosei

    when ADJUST_RIGHT
      # �E�����ւ̕␳�l��Ԃ�
      hosei = xmax - chkx + 1
      @adjust_x = x + hosei
      @adjust_y = y
      @continue_tile = true if xmax == (@tilewidth - 1)
      return hosei

    end
  end
  return true
end

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# File 'bgatari.rb', line 369

def dump_tile_atari_data
  self.atari_tbls.keys.sort.each do |i|
    puts "\n"
    puts "# code = #{i}"
    p self.atari_tbls[i]
  end
end

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# File 'bgatari.rb', line 199

def get_bg_code(x, y)
  tx = ((x.to_i % @map_width) / @tilewidth).to_i
  ty = ((y.to_i % @map_height) / @tileheight).to_i
  @bg_code = @mapdata[ty][tx]
  return @bg_code
end

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# File 'bgatari.rb', line 146

def make_tile_atari_table(img)
  tbls = []
  w, h = img.width, img.height

  # �㉺�Ŏg���A�^������p�e�[�u�����쐬
  tbl = []
  w.times do |x|
    ymin = nil
    ymax = nil
    h.times do |y|
      unless ymin
        # �h�b�g������H
        ymin = y if img[x, y][0] > 128
      end
      unless ymax
        # �h�b�g������H
        ymax = ((h - 1) - y) if img[x, (h - 1) - y][0] > 128
      end
    end
    tbl.push([ymin, ymax])
  end
  tbls.push(tbl)

  # ���E����̃A�^������p�e�[�u�����쐬
  tbl = []
  h.times do |y|
    xmin = nil
    xmax = nil
    w.times do |x|
      unless xmin
        # �h�b�g������H
        xmin = x if img[x, y][0] > 128
      end
      unless xmax
        # �h�b�g������H
        xmax = ((w - 1) - x) if img[(w - 1) - x, y][0] > 128
      end
    end
    tbl.push([xmin, xmax])
  end
  tbls.push(tbl)

  return tbls
end