程序使用windows GDI 完成了十个圆在屏幕上随机移动，每个圆的填充色随机生成，当多个圆有重合部分时，重合部分用这些圆的混合色填充。用于帮助对GDI区域的理解。-Program uses the windows GDI completed 10 randomly moving circle on the screen, the fill color of each round randomly generated, when the two circles are overlapping