说明：  C烟花效果，可惜一开始没能画成圆,所以整个过程都是菱形的变换,希望大家多多指教,能够想办法把初始状态就围成一个圆.
(C fireworks effect, but did not start painting into a circle, so the whole process of transformation are diamond-shaped, I hope the exhibitions we can think of ways to the initial state on a circle surrounded.)