How is the arm linkage of NetEase's sleeping position competition realized?

problem description

it is said that the game was very popular a long time ago, but I suddenly saw it some time ago. It was fun to play, and then I thought about how to achieve this kind of arm linkage

first of all, both arms and legs are divided into two parts (if they are not divided into two parts, they really don"t know how to bend). Moving the upper arm or lower arm will cause the whole arm to move together (the legs are similar)

the environmental background of the problems and what methods you have tried

without relevant experience, there is no way to start

related codes

/ / Please paste the code text below (do not replace the code with pictures)
not yet

what result do you expect? What is the error message actually seen?

not available for the time being

attach address NetEase sleeping position contest

Javascript pixijs tween.js

Apr.01,2021

this kind of animation is called bone animation and requires some physical knowledge.
https://www.cnblogs.com/zhang.

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