zhengxuan

说明：  图形程序设计及其应用 在屏幕上出现一个圆心沿正弦曲线轨迹移动的实心圆，而且，每隔四分之一周期，圆的填充色和圆的周边颜色都发发生了变化(颜色自己选取)，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
(Graphics program design and its application in a center along a sinusoidal trajectory solid circle appears on the screen, and every quarter of a cycle, the fill color of the circle, and the circle surrounding color hair occurrence changes (color select) Meanwhile, the radius of the circle in the fourth cycle of the sinusoidal amplitude of 0.2 to 0.6 times the linear growth)