Dweets awesomed by u/alexcodev

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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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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New_Core

function u(t) {

t?t%2<1.98?0:Z=Z*1.4:Z=.1
for(i=22;i--;x.fillRect(300+b*50,0,C(a+b),182))b=t*60%2,x.setTransform(d=Z*S(a=t/7+i/3.5),e=Z*C(a),e,-d,999,540)

Nov 14 2020 3:55 PM UTC

}// 138/140

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alexcodev

function u(t) {

if (Math.trunc(t)%3 == 0) {c.width=1920}
x.font = '300px serif';
x.strokeText('Hello world', 200+(t*20), 600+(t*20));
x.rotate(S(t));

Nov 14 2020 3:53 PM UTC

}// 133/140

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u/DataMeta

welcome :) #helloworld

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femto113

function u(t) {

c.width=1920
X=960,Y=540,P=Math.PI,N=t/P%32,p=P/N
for(i=0;i<P;i+=p)x.fillRect(X+Y*(S(i+P)-S(i))/2*S(t+i),Y+Y*(C(i+P)-C(i))/2*S(t+i),19,19)

Nov 14 2020 8:31 AM UTC

}// 138/140

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linear motion rolling circle illusion

u/katkip

#illusion
u/DataMeta

nicely done
u/pavel

If you delete c.width=1920 you can see only the first dot move linearly
u/femto113

curves are a side effect of changing N with t, if you use a fixed value like N=16 you get straight lines

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