float speed_y; /**< scroll-speed in vertical direction */
std::auto_ptr<Surface> image_top; /**< image to draw above pos */
std::auto_ptr<Surface> image; /**< image to draw, anchored at pos */
float speed_y; /**< scroll-speed in vertical direction */
std::auto_ptr<Surface> image_top; /**< image to draw above pos */
std::auto_ptr<Surface> image; /**< image to draw, anchored at pos */