look at the effect:
http://www.flash8.net/bbs/UploadFile/2005-7/20057142031073.swf
Click here to download the source file
Production Method:
Draw a set of flame-burning cycle animation
This is the first one to notice the shape of a gourd in the middle of the flame
The neck of the gourd is narrow because the fire is burning and there is air pressure coming in.
Formed two flames, and a small flame overflowed.
Two flames completely apart.
Above the flames grew smaller below the flames were again burning up
The flames are going to disappear, and the flames continue to grow.
Flames grew up in the middle and began to appear inside the gourd shape development, this is the last figure it to and the first diagram of the link, now make the overall effect of the flame burning below to do some details: The flame is divided into ignition and external combustion, so we will add these up.
The other figure is the same, and then fill the color
Now it's just a separate flame, and to get better results, we can adjust the starting order of the above pictures, and then resize them together so that we can get a sense of disorderly burning, and finally, with the wood and the background to do it.