Top dweets of all time

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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euvl

function u(t) {

c.width|=0;f=t%2/2;for(i=0;i<10;i++){j=i-f;m=j/9;n=(9-j)/9;x.globalAlpha=0.1-f*(i==0?0.1:0.0002);x.fillRect(960*m, 540*m, 1920*n, 1080*n);}

Feb 22 2017 2:10 AM UTC

}// 139/140

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sfz

function u(t) {

c.width|=0;s=60;tt=t*360;tx=tt%1950;ty=tt%1210;c.style.background='#333';x.fillStyle='#0f8';x.beginPath();x.arc(0+tx,0+ty,s,0,7);x.fill()

Feb 22 2017 1:43 AM UTC

}// 137/140

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fufuhaaa

function u(t) {

c.width=2e3;r='';for(i=0,l=1;i<1e9;){m=i;i+=l;l=m;r+=i}for(i=0;i<200;)x.fillRect((r[++i]*192+(t*1e4)/(1+r[++i]))%2e3,(r[++i]*100),9,9);

Feb 22 2017 1:30 AM UTC

}// 135/140

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The Fibonacci numbers concatenated may not be the best way of generating random numbers, but it's the only short one that came to mind.

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pilow

function u(t) {

c.width=704;x.filter="blur("+Math.sqrt(1e4-((t%6)*1800))+"px)";i=new Image();i.src='https://pilow.fr/r.jpg';x.drawImage(i,0,0,704,396);

Feb 14 2017 7:25 PM UTC

}// 135/140

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iverjo

remix of d/627 by u/cristea

function u(t) {

c.width=960;for(i=20;i--;)for(j=12;j--;)x.fillRect(50*i-7*S(A=4*t+i),50*j+7*C(A),W=32+C(A)/.3,W),x.fillStyle=i<7?'#027':i<13?'#fd1':'#c12'

Jan 15 2017 11:43 AM UTC

}// 138/140

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More precise colors and more movement

u/iverjo

#flag
u/katkip

#romania

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iverjo

function u(t) {

c.width=1920;x.beginPath();x.beginPath();x.arc(960,500,199,t*4+2*C(t),t*4+3.2+2*S(t));x.lineWidth=40;x.strokeStyle='#5592FB';x.stroke();

Jan 14 2017 4:48 PM UTC

}// 136/140

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Android-style loading spinner

u/iverjo

119 characters: c.width^=0;x.beginPath();x.arc(960,500,199,t*4+2*C(t),t*4+3.2+2*S(t));x.lineWidth=40;x.strokeStyle='#5592FB';x.stroke()
u/iverjo

#loading #spinner

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Run

function u(t) {

x.fillStyle=R(S(t/3)*255,S(1+t/3)*255,S(2+t/2)*255);
t*=10;
x.fillRect(960+460*S(t/4)*t/270,540+460*C(t/4)*t/270,55,55);

Jan 14 2017 4:34 PM UTC

}// 120/140

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iverjo

remix of d/302 by u/sigveseb

function u(t) {

(F=Z=>{for(W=4e3/Z,x.fillStyle=R(W,W/4,W/2),i=Z*Z*2;n=i%Z,m=i/Z|0,i--;n%2^m%2&&x.fillRect((n-t%2-1)*W,(t%2-3+m)*W,W,W));Z&&F(Z-6)})(36)

Jan 14 2017 4:06 PM UTC

}// 135/140

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#recursive

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iverjo

remix of d/596 by u/iverjo

function u(t) {

c.width=1920;for(i=-2;i<2;i+=.05)for(j=-4;j<4;j+=.05)a=j-3*S(t),1/(j*j+i*i)+1/(a**4+i**4)>1&&x.fillRect(j*240+960,i*240+540,12,12)

Jan 14 2017 3:46 PM UTC

}// 130/140

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This may not work in FireFox at the time of writing, because of the new ** operator (exponential). Works in Chrome though :)

u/donbright

yup, blank in firefox
u/Polyducks

This is so gorgeous. Well done
u/iverjo

#metaballs

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iverjo

remix of d/580 by u/iverjo

function u(t) {

t>7?(x.fillStyle='#fff',x.fillRect(209+(t|0)*99,220,15,15)):(X=S(S(t*4)*1.5)*.6,x.lineTo(960+512*X*X*X,480-32*(13*C(t)-4*C(2*t))),x.fill())

Jan 3 2017 10:53 AM UTC

}// 139/140

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Wait for it

u/iverjo

Alien?
u/joeytwiddle

a Japanese lady