制作火焰文字

运行时文字周围有火焰闪动，颇为好看。

基本思想：

对于给定的文字，其周围的三原色分量值往外依次减去一个随机量

（该随机量随时间改变，造成动画效果），直到减到0为止。在文

字周围即可看到比文字颜色淡的火焰。如果忽略蓝色分量，并使黄

色分量减的快一些，即可得到真实的火焰效果。

-text characters running around a flame flicker, rather pretty. Basic idea : For a given language, around magenta-money overseas minus a random order quantity (the amount of random change with the times. create animation effects), until reduced to 0 so far. In the text can be seen around the text color than the desalination of flame. If neglected blue, yellow-minus enable the faster, can be real flame effect.