提供基本图形的绘制，如矩形，圆，椭圆，基本线条等，可以选择不同的颜色，可以很方便地各种流程图等，是学习vc++图形绘制的典型范例。-provide basic graphics rendering, such as rectangular, round, oval, the basic lines, and can choose a different color, it is easy to flowcharts, is a graphic study vc are typical examp