#==============================================================================
# ■ Numset
#------------------------------------------------------------------------------
# 　定数全般のモジュールです。
#==============================================================================

module Numset
  WEATHER_MAX = 40                  # 天候画像の最大表示数
end

#==============================================================================
# ■ RPG::Weather
#------------------------------------------------------------------------------
# 　天候を扱うクラスです。
#==============================================================================

module RPG
  class Weather
    #--------------------------------------------------------------------------
    # ● 構造体
    #--------------------------------------------------------------------------
    # 順にファイル名、X移動ピクセル、Y移動ピクセル、不透明度変化、表示時間
    Type = Struct.new("Type", :name, :bitmap, :vektor_x, :vektor_y, :vektor_alpha, :duration)
    @weathers = []
    @weathers.push(Type.new("rain", nil, -2, 16, 8, 24))
    @weathers.push(Type.new("storm", nil, -8, 16, 12, 16))
    @weathers.push(Type.new("snow", nil, -2, 8, 8, 24))
    #--------------------------------------------------------------------------
    # ● 公開インスタンス変数
    #--------------------------------------------------------------------------
    attr_reacer :types
    attr_reader :max
    attr_reader :ox
    attr_reader :oy
    #--------------------------------------------------------------------------
    # ● オブジェクト初期化
    #--------------------------------------------------------------------------
    def initialize(viewport = nil)
      @type = 0
      @max = 0
      @ox = 0
      @oy = 0
      @sprites = []
      @types = Array.new(@weathers.size){0}
      @durations = Array.new(40){0}
      for weather in @weathers
        weather.bitmap = RPG::Cache.picture(weather.name)
      end
      for i in 0...Numset::WEATHER_MAX
        sprite = Sprite.new(viewport)
        sprite.z = 0
        sprite.visible = false
        sprite.opacity = 0
        @sprites.push(sprite)
      end
    end
    def dispose
      @sprites.each{|sprite| sprite.dispose}
    end
    def type=(size)
      return if @type == type
      @type = type - 1
      if @weathers[type] != nil
        bitmap = @weathers[type].bitmap
      else
        bitmap = nil
      end
      for i in 0...Numset::WEATHER_MAX
        sprite = @sprites[i]
        sprite.visible = (i <= @max)
        sprite.bitmap = bitmap
      end
    end
    def ox=(ox)
      return if @ox == ox
      @ox = ox
      @sprites.each{|sprite| sprite.ox = @ox}
    end
    def oy=(oy)
      return if @oy == oy
      @oy = oy
      @sprites.each{|sprite| sprite.oy = @oy}
    end
    def max=(max)
      return if @max == max;
      @max = [[max, 0].max, Numset::WEATHER_MAX].min
      (0...Numset::WEATHER_MAX).each{|i| @sprites[i].visible = (i <= @max)}
    end
    def update
      return if @type == 0
      for i in 0...@max
        sprite = @sprites[i]
        if @weathers[@type - 1] != nil
          base = @weathers[@type - 1]
          sprite.x += base.vektor_x
          sprite.y += base.vektor_y
          sprite.opacity -= base.vektor_alpha
          @durations[i] -= 1
          if base.name =~ /@(\d+)@(\d+)$/
            if ((base.duration - @durations[i]) % $2.to_i) == 0
              sprite.src_rect.width = sprite.bitmap.width / $1.to_i
              sprite.src_rect.x = (sprite.src_rect.x + sprite.src_rect.width) % sprite.bitmap.width
          end
        end
        x = sprite.x - @ox
        y = sprite.y - @oy
        if @durations[i] == 0
          sprite.x = rand(800) - 50 + @ox
          sprite.y = rand(800) - 200 + @oy
          sprite.z = sprite.y + 180 - @oy
          sprite.opacity = 255
          @durations[i] = base.duration
        end
      end
    end
  end
end