在WINCE中实现图形的一些特殊显示，如水平向左扫描，水平向右扫描，水平百叶窗，竖直百叶窗，水滴效果等显示。-In WINCE graphics to achieve some special shows, such as the level of the left scanning, scan to the right level, horizontal blinds, vertical blinds, water droplets show effects.