图片切换效果，实现从右下角翻页，成3D效果，基于QT4写的，效果流畅-Picture transition effects, from lower right corner of page, into a 3D effect, based on QT4 written, the effect is smooth

利用CRgn类实现模拟翻页功能,产生翻页的动画效果。-Realize FlipPage function Using CRgn