请大神帮我看看这为什么会绘制两个矩形 - Project1

Red = Color.new(255,0,0)
class Sprite_Card < Sprite
#--------------------------------------------------------------------------
# ● 初始化对象
#--------------------------------------------------------------------------
def initialize(viewport =@viewport)
super(viewport)
create_bitmap
update
end
#--------------------------------------------------------------------------
# ● 释放
#--------------------------------------------------------------------------
def dispose
self.bitmap.dispose
super
end
#--------------------------------------------------------------------------
# ● 生成位图
#--------------------------------------------------------------------------
def create_bitmap
self.bitmap = Bitmap.new(480, 960)
end
#--------------------------------------------------------------------------
# ● 更新画面
#--------------------------------------------------------------------------
def update
super
update_bitmap
update_position
end
#--------------------------------------------------------------------------
# ● 更新源位图（Source Bitmap）
#--------------------------------------------------------------------------
def update_bitmap
redraw
end
#--------------------------------------------------------------------------
# ● 重绘
#--------------------------------------------------------------------------
def redraw
#self.bitmap.clear
self.bitmap.fill_rect(self.x,self.y,self.x+120,self.y+180,Red)
end
#--------------------------------------------------------------------------
# ● 更新位置
#--------------------------------------------------------------------------
def update_position
self.x = 60
self.y = 60
self.z = 200
end
end

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