We also set a condition which resets the id to 1 when id becomes greater than 100. This is done to keep the names of the duplicated clips small.
- random() is a function which takes a number as its argument. random(3) will yield either 0,1 or 2. Similarly, random(2) will yield either 0 or 1.
- _root["trail"+id]._x+=random(20) is the same as _root["trail"+id]._x=_root["trail"+id]._x+random(20)
- Similarly,_root["trail"+id]._y+=random(20) is the same as _root["trail"+id]._y=_root["trail"+id]._y+random(20)
The above two statements randomize the location of the duplicated MovieClips to give a spread effect. You can omit the two statements if you want a simple linear trail.
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