GDI可视化编程，设置一个定时器，每隔1秒整个屏幕由红绿蓝定时变换。-GDI visual programming, a timer is set, the screen every second time by the red, green and blue conversion.

编写一个程序，在屏幕上出现一个圆心沿正弦曲线轨迹移动的实心圆，要求每隔四分之一周期，圆的填充色和圆的周边颜色都发生变化，同时，圆的半径在四分之一周期之内由正弦曲线幅值的0.2倍至0.6倍线性增长-Write a program that appears on the screen a circle along a sinusoidal trajectory solid round, requiring every fourth cycle, a circle filled with color

在窗口中画一个旋转的风车，风车中有三个叶片，颜色分布为红黄篮，叶片外侧有个外接圆。-Painting in the window of a rotating windmill, windmill has three blades, the color distribution of red, yellow basket, outer leaves have a circumcircle.