I need some help to study some source code of functions like "warp transform" in Gimp

I want to use and learn the “Move Pixels” function in gimp.I note it uses GEGL and I have run some demos in GEGL project by using gegl node,but I can’t figure out how to realize the image warping with gegl node.Can someone provide some help like a demo ,websites or some articles about that function.
I’m sorry for my poor English and bothering you guys.
Thanks in advance.

Hi, you are more likely to receive help regarding the code on irc.

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