{{{
    "planted": "11/17/2020",
    "repotted": "1/4/2026",
    "nobreak": "true"
}}}

* Anyone up for a game of snake? wait a minute...

    I made an implementation of FABRIK inverse kinematics in a #pico8 #tweetcart! (source in replies)
    #tweetjam

![](media/11_17_2020.gif)

<div class="code"><p>
poke(24365,1)x={}y={}z=16for i=0,32do
x[i]=0y[i]=0end::_::cls()for j=1,-1,-2do
for i=z-z*j+j,z+z*j,j do
a=x[i]-x[i-j]b=y[i]-y[i-j]l=(a*a+b*b)^.5a/=l
b/=l
x[i]=x[i-j]+a*4y[i]=y[i-j]+b*4end
end
for i=0,32do
circfill(x[i],y[i],2,i%8+8)end
x[0]=stat(32)y[0]=stat(33)flip()goto _
</p></div>

* This implementation was based on a great cart and writeup by [@2DArray](https://twitter.com/2DArray), which can be found here!
    [https://lexaloffle.com/bbs/?pid=42900](https://lexaloffle.com/bbs/?pid=42900)

*gardener's note: I love the simplicity of this algorithm. It's really satisfying that such a complex problem can be approximated with such basic constraint solving.*