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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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Current theme challenge: #Food

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wuqiooo

function u(t) {

l=c.width+=i=0;h=400;for(;++i<200;)for(j=a=(t+C(i))%2;j++<50;)x.fillRect(l*C(i*i)+~~a*(w=a*h-h)*C(j),(~~a?h:a*h)*(C(i)*C(i)+2)+w*S(j)/4,3,3)

Dec 27 2017 10:46 AM UTC

}// 140/140

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u/Sven

So cool! I love the puddle effect

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jaemiejaemie

function u(t) {

c.width=640;x.beginPath();for(i=0;i<640;i++){a=180;for(j=1;j<t*60%60;j+=~~(t)%2+1){a+=S((i+t*60)*j/20)*50/j}x.lineTo(i,a)}x.stroke()

Dec 27 2017 10:31 AM UTC

}// 132/140

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demonstration of basic fourier curves (square/saw)

Show more comments…
u/sigveseb

Very cool!
u/joeytwiddle

Nice. DSP hero!
u/iverjo

Kudos!
u/RomanW

Excellent!
u/joeytwiddle

#math
u/katkip

#fourier

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justinjw1

remix of d/3713 by u/bobdunn

function u(t) {

c.width=1920; 
  for(i=0;i<1000;i++)
  x.fillRect(i*18, 475 + C(23333333333*t+(i*3))*375, 32, 200)

Dec 27 2017 10:23 AM UTC

}// 98/140

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itsjustmustafa

function u(t) {

x.fillRect(0,0,1920,1080);x.font="99px a";for(i=6;i>-1;i--)x.fillText(["🌞","🌍","👽","🚀","🛰️","🌌"][i],880+i*150*S(t*i),590+i*90*C(t*i))

Dec 27 2017 10:21 AM UTC

}// 134/140

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u/iverjo

+1 for the concept ;)
u/joeytwiddle

#emoji in #space #planet

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lurifax

remix of d/3262 by u/lurifax

function u(t) {

for(x[f='fillRect'](i=0,0,2e3,2e3);i++<(w=255);x.fillStyle=R(a=(w-i)*2,a/2.5,50,1.2-i%w/w))x[f](960-S(i+t)*i*3,540-C(i+t)*i*2,d=t/4*i%18,d)

Dec 27 2017 10:15 AM UTC

}// 139/140

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Light swirl - Warning if you stare to long in the middle your vision might be temporary impaired :)

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agentorange

function u(t) {

// my first dweet
c.width=w=1920;h=1080;
x.fillRect(w/2, h/2, S(t)*w/2, C(t)*h/2);

Dec 27 2017 10:02 AM UTC

}// 82/140

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jcy

remix of d/3995 by u/jcy

function u(t) {

c.width|=0;for(i=1;i<140;i++){b=2*t+i;o=10-(S(b+5)*126)%256;x.fillStyle=R(0,o,0,1);x.fillRect(940+((i/60)%1)*S(b)*200,400+i*6%400,8,8);}

Dec 27 2017 9:59 AM UTC

}// 137/140

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jcy

remix of d/3760 by u/sadropol

function u(t) {

c.width|=0;for(i=1;i<140;i++){b=2*t+i;o=100-(S(b+5)*126)%256;x.fillStyle=R(0,o,0,1);x.fillRect(940+((i/60)%1)*S(b)*200,400+i*6%400,8,8);}

Dec 27 2017 9:59 AM UTC

}// 138/140

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@xlatd7

function u(t) {

c.width=1920;n=7;for(i=0;i<n;i++){x.fillStyle=R(190+i/n,64+S(t),255*i/n);x.fillRect(400+i*100+S(t*2*C(i*t/10))*300,500+C(t*i*2)*100,50,50)}

Dec 27 2017 9:59 AM UTC

}// 139/140

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wind on my sin...

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juicetan

function u(t) {

c.width^=0;w=(C(t)+1)*200;x.fillStyle=R(0,0,0,0.2+(C(t)+1)/2);x.fillRect(w,(S(t)+1)*490,1920-2*w,50);

Dec 27 2017 9:53 AM UTC

}// 101/140

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