Hi Darius,
This kind of animation is time framed : Skeleton and geometric propagation (linear transformation an so on).
A good point to begin : The Spine
http://esotericsoftware.com
You will find "runtime" Pascal engine for the file product by spine here : http://esotericsoftware.com/spine-in-depth#Runtimes
Cheers,
P.s. : The Pascal Runtime has been writen by Dan.
http://www.pascalgamedevelopment.com/member.php?564-Dan
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