简单屏幕烟花程序。

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.-Simple screen fireworks program. Unfortunately, she did not draw into a round, so the whole process is the diamond transformation, we hope the exhibitions, to think of ways to the initial state formed a circle.