Hey Duoas (or whoever else): how do you draw trees?

I noticed the Heapsort article of the C++ FAQ, and it has nice animations of trees.
I am interested to know what software was used to create those animations.


I ask mainly because I consider writing a big Data Structures article, covering all the good stuff that beginners sometimes post about.

Of course, I still have much studying to do, so even if I decide to write the article, it won't be completed very soon. (The "beginners shouldn't teach beginners" saying comes to mind, yes?)

Edit: grammar.
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You could make something like that using GIMP or Photoshop since it looks to be one set image and then each frame has different highlights/text added, just save it as a .gif. Though there might be better software out there for simple 2d animations.
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