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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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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pythech

remix of d/8575 by u/New_Core

function u(t) {

with(x)for(b=c.width|=i=40;i--;fill())ellipse(i*199%b+99*S(a=t+i),1200-a*i*20%1300,77,99,0,!beginPath(fillStyle=`hsl(${i*i},99%,50%,.9)`),9)

Jun 13 2018 1:26 AM UTC

}// 140/140

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added transparency, hsl trick doesn't work on Safari it seems

u/joeytwiddle

Instead of hsl(...) you can use hsla(... which will work in Safari
u/pythech

yeah but then you'll exceed the character limit, oh well
u/pythech

the other browsers silently accept the 4th parameter when they should not. That's a bit trickery for me, or at least that's what I meant. I could phrase it a better it seems, thanks for helping anyway, my bad :D

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pythech

remix of d/8528 by u/BirdsTweetCodersDweet

function u(t) {

for(i=2;i--;x.fill())x.beginPath(x.fillStyle=R(i?a=S(t*2)*129+129:0,0,i||a))|x.arc(960+80*S(i?π=t*5:n),540+80*C(i?n=π+3:π),80-30*S(t*8),0,7)

Jun 11 2018 12:32 AM UTC

}// 140/140

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golfed version of a=S(t*2) variation, which was mentioned under the comments by OP

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veubeke

function u(t) {

r=Math.random
!t||(p|q)>>10|x.getImageData(p+d*2,q+e*2,1,1).data[3]?p=r(d=C(_=r(q=r()*1e3)*7|0),e=S(_))*1e3:x.fillRect(p+=d*2,q+=e*2,2,2)

Jun 8 2018 8:21 PM UTC

}// 137/140

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Tried to create a random city map. It doesn’t work as intended but is still nice to look at. ;)

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firegodjr

remix of d/5179 by u/JonasPeeters

function u(t) {

c.width=150
d=new Date
b=5
f=(a)=>{for(i=0;i<60;i++){x.fillText(a==i?i:" "+i,b*16,50-(i-a)*9)}b--}
f(d%6e4/1e3|0)
f(d%6e5/6e4|0)

Jun 7 2018 7:05 PM UTC

}// 128/140

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golfed to 128

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vincent

function u(t) {

r=Math.random
for(a=2e3;a--;x.fillRect(a,b,1,1))_=r(b=r()*1000)*200>Math.hypot(a-1960,b-40)-23,x.fillStyle=R(s=(_?7:r()+2)*4,s,220+_*r()*20)

Jun 7 2018 2:20 PM UTC

}// 140/140

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firegodjr

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(new Date/1000)*300,400,50,200) // draw 50x200 rects

Jun 7 2018 2:27 AM UTC

}// 124/140

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#default with variable framerate!

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firegodjr

function u(t) {

v=new Date%2000
c.width=1920
x.fillRect(v-50,500,50,200)

Jun 7 2018 1:59 AM UTC

}// 56/140

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Total framerate freedom!

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sukkamehu

remix of d/8456 by u/sukkamehu

function u(t) {

c.width|=0;for(i=f=450;i--;)x.fillRect(f+S((i+t*9)/64)*f*S((i+t*5)/12)+f,i*5,5,5*i)

Jun 6 2018 10:52 PM UTC

}// 83/140

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andc2600

remix of d/8376 by u/andc2600

function u(t) {

c.width=99
x.fillRect(0,0,99,99)
x.fillStyle="green"
x.fillText((new Date).toLocaleString(),2,32)

Jun 6 2018 8:43 PM UTC

}// 97/140

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Xen

remix of d/8391 by u/E-Mouse

function u(t) {

for(c.width|=i=2e3;i--;)x.fillRect(S(t*i+i/t)*i+960,C(t*i+i/t)*i+540,i/8,i/9)

Jun 4 2018 11:53 PM UTC

}// 77/140

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DnB Remix