列表框的使用，旋转按钮最小步长0.1，类与类的数据传输，GDI内存作图，画圆，填充颜色，鼠标形状变幻，随机函数，类似打地鼠的小游戏程序-Use the list box, spin buttons minimum step size 0.1, data transfer between classes, GDI memory mapping, Circle, fill color, shape of the mouse changes, random function, similar to t