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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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katkip

remix of d/5042 by u/BackendForth

function u(t) {

f=(a,b,r)=>{x.lineTo(a,b,r/2,r/2);if(r>1){w=(r)/9+t,f(a+C(w)*r,b+S(w)*r,r/2),f(a+S(w)*r,b+C(w)*r,r/2)}},c.width=1920,f(960,540,250),x.fill()

Oct 5 2018 10:12 AM UTC

}// 140/140

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smtsjhr

remix of d/19958 by u/smtsjhr

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪁼👪🐱𝠻𪠭𛐻𚑻𮀮𫑯𭡥𥁯𚁵🐵𜀰𚠨𥀨𭀯𝰫𪠩𛐮𝐩𛁶👵𛰲𚰲𜀰𚡃𚁪𚱴𚐩𞱦𫱲𚁩🐵𞱩𛐭𞱸𛡬𪑮𩑔𫰨𭐫𚁷🐭𝐰𚱵𛰵𚐪𠰨𨐽𛠳𚱓𚀵𚡴𚰱𜀪𤰨𪠩𚐯𜐮𝐩𚡓𚀱𛠵𚡩𚐬𭠫𭰪𚁃𚀱𛠵𚡩𚐯𝐰𚱩𙐲𚡓𚁡𚐩𚐩𮱸𛡦𪑬𫀨𚑽𯐻`.replace(/u../g,'')))

Sep 15 2020 3:07 AM UTC

}// 134/140

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short looped variant of d/19958

Show more comments…
u/danny@hille.dk

for(c.width|=j=16;j--;){x.moveTo(u=500*(T(t/7+j)-.5),v=u/2+200*C(j+t));for(i=5;i--;x.lineTo(u+(w=-50+u/5)*C(a=.3+S(5*t+10*S(j))/1.5)*S(1.5*i),v+w*(C(1.5*i)/50+i%2*S(a)))){x.fill()}};
u/danny@hille.dk

Woops didn't mean to sumitt that :-)
u/danny@hille.dk

143b and still looks ok... ->for(c.width|=j=9;j--;)for(i=4,x.moveTo(u=500*(T(t/4+j)),v=u/i+9*C(t));i--;x.lineTo(u+j+v*C(a=S(5*t+S(j)))*S(1.4*i),v+v*(a/9+i%2*S(a))))x.fill()
u/danny@hille.dk

I can't shave of the last 3 bytes without messing it up :-(
u/danny@hille.dk

139b version ->for(c.width|=j=9;j--;)for(i=4,x.moveTo(u=555*(T(t/4+j)),v=u/i+9*C(t));i--;x.lineTo(u+j+v*C(a=S(5*t+S(j)))*S(1.4*i),v+v*(i%2*S(a))))x.fill()
u/smtsjhr

wow well done! very fair trade off removing that 'a/9' addition since its small: |a/9|<0.1
u/danny@hille.dk

Thanks, Im not going tell how long it took me to figure that out though :-)

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NoahPeeters

function u(t) {

c.width=1920
for(i=0;i<1000;i++){l=i/30*10*S(t*10)*(t/3+0.5)*3
a=(i%30)*0.2094395067+t*t
x.fillRect(960+S(a)*l,540+C(a)*l,20,20)
}

Jan 2 2018 10:11 PM UTC

}// 130/140

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rnbw

function u(t) {

for(c.width+=i=0;++i<3e3;x.fillStyle=`#5`+i/10)x.fillRect(940+i*S(t*2+i/99*S(t/3+i/400))/i*300,540+i*C(t*2+i/99*S(t/3-i/400))/i*300,7,7)

Jan 27 2020 3:44 PM UTC

}// 136/140

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implicit boundaries

u/rnbw

i just realized that i could have cut down on this a little, there are a few unnecessary operations (like i/i spread across functions a few times)

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rodrigo.siqueira

remix of d/17222 by u/tomxor

function u(t) {

for(a=b=0,i=1e5;i--;a+=(r-a+b*S(a*2.8)/2)/3,b+=C(a*3)/2-99*a/i)i&1&&(r=i*t/b&1,x.fillRect(a*1880,b*500+500,.1,t<6))

Sep 4 2023 7:55 PM UTC

}// 115/140

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Dense branches

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katkip

function u(t) {

c.width*=1;for(i=40;i--;)for(j=40;j--;)x.beginPath(),x.ellipse(i*50,j*26,26,0,t*9+(i&j),0,7),x.stroke();

Dec 9 2018 12:49 PM UTC

}// 104/140

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Can you see the #sierpinski?

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rileyjshaw

function u(t) {

if(!t)for(i=1e6;i--;X=i%1e3,Y=i/1e3,x.fillStyle=`hsl(${~~T(X*Y)},40%,40%)`,x.fillRect(460+X,40+Y,1,1));

Apr 27 2017 4:39 AM UTC

}// 103/140

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Film grain effect (may take a few seconds to render)

u/rileyjshaw

(Looks nicer fullscreen)

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magna

remix of d/22309 by u/magna

function u(t) {

for(i=3e3;i--;x.fillRect((X*2+1-v*v)*15,Y*30,v*v*30,30))X=i%64,Y=i>>6,v=S(t*3+(Y-18)*(X-32)/39),x.fillStyle=R(v*99+99,X+S(t/2)*99&63^Y,T(t))

Mar 31 2021 5:27 AM UTC

}// 140/140

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Composite effects

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slome

function u(t) {

while(true) {x.fillRect(300,400,50,200)} // draw 50x200 rects}

Nov 3 2018 11:02 AM UTC

}// 62/140

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initramfs

remix of d/22850 by u/New_Core

function u(t) {

for(i=a=500;i--;x.fillRect(960+(t*t*C(i*9.97+t)+a*S(v=i>>4)*3)*Z,800+(200-t*100)*Z,Z*9,Z))Z=199/(i%a+a/9),x.fillStyle="#105"

May 31 2021 5:38 AM UTC

}// 125/140

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