請問如何以腳本,使圖片灰階化顯示? - Project1

#==============================================================================
# ■ Window_MenuStatus
#------------------------------------------------------------------------------
# 　显示菜单画面和同伴状态的窗口。
#==============================================================================
class Window_MenuStatus < Window_Selectable
#--------------------------------------------------------------------------
# ● 初始化目标
#--------------------------------------------------------------------------
def initialize
super(0, 0, 480, 480)
self.contents = Bitmap.new(width - 32, height - 32)
@actor_img = Array.new
for i in 0...$game_party.actors.size
actor = $game_party.actors[i]
@actor_img.push Sprite.new
bit = RPG::Cache.character(actor.character_name, actor.character_hue)
cw = bit.width / 4
ch = bit.height / 4
src_rect = Rect.new(0, 0, cw, ch)
@actor_img[i].bitmap = Bitmap.new(cw,ch)
@actor_img[i].bitmap.blt(0, 0, bit, Rect.new(0,0,cw,ch))
@actor_img[i].x = 122 + 64
@actor_img[i].y = 48 + i * 116
@actor_img[i].z = self.z + 1
end
refresh
self.active = false
self.index = -1
end
#--------------------------------------------------------------------------
# ● 刷新
#--------------------------------------------------------------------------
def refresh
self.contents.clear
img_update
@item_max = $game_party.actors.size
for i in 0...$game_party.actors.size
x = 64
y = i * 116
actor = $game_party.actors[i]
#draw_actor_graphic(actor, x - 40, y + 80)
draw_actor_name(actor, x, y)
draw_actor_class(actor, x + 144, y)
draw_actor_level(actor, x, y + 32)
draw_actor_state(actor, x + 90, y + 32)
draw_actor_exp(actor, x, y + 64)
draw_actor_hp(actor, x + 236, y + 32)
draw_actor_sp(actor, x + 236, y + 64)
end
end
#--------------------------------------------------------------------------
# ● 刷新光标矩形
#--------------------------------------------------------------------------
def update_cursor_rect
img_update
if @index < 0
self.cursor_rect.empty
else
self.cursor_rect.set(0, @index * 116, self.width - 32, 96)
end
end
def img_update
for i in 0...$game_party.actors.size
if i == @index
@actor_img[i].tone.gray = 0
else
@actor_img[i].tone.gray = 255
end
end
end
def dispose
super
@actor_img.each{|i| i.dispose}
end
end

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