windows moblie 绘制圆角矩形框。半透明效果,Drawing rounded rectangular windows moblie box. Translucent effect

GDI+绘图基本操作，包括绘制直线、矩形、椭圆以及绘制填充的基本图形，并可以把绘制的图形保存为位图-GDI+ graphics basic operations, including drawing a straight line, rectangle, ellipse, and fill the basic graphics rendering, and rendering can be saved as a bitmap graphics