function RotateRadian(self, radian)
        if type(radian) ~= "number" then
            error("Usage: Texture:RotateRadian(radian) - 'radian' must be number.", 2)
        end
 
        if not self.__OriginTexCoord then
            self.__OriginTexCoord = {self:GetTexCoord()}
            self.__OriginWidth = self.Width
            self.__OriginHeight = self.Height
        end
 
        while radian < 0 do
            radian = degree + 2 * math.pi
        end
        radian = radian % (2 * math.pi)
 
        local angle = radian % (math.pi /2)
 
        local left = self.__OriginTexCoord[1]
        local top = self.__OriginTexCoord[2]
        local right = self.__OriginTexCoord[7]
        local bottom = self.__OriginTexCoord[8]
 
        local dy = self.__OriginWidth * math.cos(angle) * math.sin(angle) * (bottom-top) / self.__OriginHeight
        local dx = self.__OriginHeight * math.cos(angle) * math.sin(angle) * (right - left) / self.__OriginWidth
        local ox = math.cos(angle) * math.cos(angle) * (right-left)
        local oy = math.cos(angle) * math.cos(angle) * (bottom-top)
 
        local newWidth = self.__OriginWidth*math.cos(angle) + self.__OriginHeight*math.sin(angle)
        local newHeight = self.__OriginWidth*math.sin(angle) + self.__OriginHeight*math.cos(angle)
 
        local ULx   -- Upper left corner X position, as a fraction of the image's width from the left (number)
        local ULy   -- Upper left corner Y position, as a fraction of the image's height from the top (number)
        local LLx   -- Lower left corner X position, as a fraction of the image's width from the left (number)
        local LLy   -- Lower left corner Y position, as a fraction of the image's height from the top (number)
        local URx   -- Upper right corner X position, as a fraction of the image's width from the left (number)
        local URy   -- Upper right corner Y position, as a fraction of the image's height from the top (number)
        local LRx   -- Lower right corner X position, as a fraction of the image's width from the left (number)
        local LRy   -- Lower right corner Y position, as a fraction of the image's height from the top (number)
 
        if radian < math.pi / 2 then
            -- 0 ~ 90
            ULx = left - dx
            ULy = bottom - oy
 
            LLx = right - ox
            LLy = bottom + dy
 
            URx = left + ox
            URy = top - dy
 
            LRx = right + dx
            LRy = top + oy
        elseif radian < math.pi then
            -- 90 ~ 180
            URx = left - dx
            URy = bottom - oy
 
            ULx = right - ox
            ULy = bottom + dy
 
            LRx = left + ox
            LRy = top - dy
 
            LLx = right + dx
            LLy = top + oy
 
            newHeight, newWidth = newWidth, newHeight
        elseif radian < 3 * math.pi / 2 then
            -- 180 ~ 270
            LRx = left - dx
            LRy = bottom - oy
 
            URx = right - ox
            URy = bottom + dy
 
            LLx = left + ox
            LLy = top - dy
 
            ULx = right + dx
            ULy = top + oy
        else
            -- 270 ~ 360
            LLx = left - dx
            LLy = bottom - oy
 
            LRx = right - ox
            LRy = bottom + dy
 
            ULx = left + ox
            ULy = top - dy
 
            URx = right + dx
            URy = top + oy
 
            newHeight, newWidth = newWidth, newHeight
        end
 
        self:SetTexCoord(ULx, ULy, LLx, LLy, URx, URy, LRx, LRy)
        self.Width = newWidth
        self.Height = newHeight
    end