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function u(t) {
} //
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u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas.
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TGY

function u(t) {

}//
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  • u/TGY
    Original idea involved mouse controls, but I was unlucky golfing it. Here is source for you to try golf&play c.width=568 t||(a=T=0,X=Y=99,onmousemove=e=>a=T?a:Math.atan2(e.y-Y,e.x-X),onclick=e=>T||=16) with(x)beginPath(translate(X-=C(a)*T,Y-=S(a)*T)),rotate(a),rect(t%1*9+9,-4,99,T?T--&0:8),fill(arc(0,0,9,0,7))

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u(t) is called 60 times per second. t: elapsed time in seconds. c: A 1920x1080 canvas. x: A 2D context for that canvas. S: Math.sin C: Math.cos T: Math.tan R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)