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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/3381 by u/sniok

function u(t) {

c.width=570;l=20;f=30;for(j=l;j--;)for(i=f;i--;x.fillStyle=R(i*l,j*l,C(t)*255),x.fillRect(S(t/2+5*j)*2+i*l-l,j*l+T(t/2+5+l/i)*l-40,f,f)){}//

Aug 5 2018 11:37 AM UTC

}// 140/140

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stiaje

remix of d/9115 by u/richev

function u(t) {

c.width|=0
x.stroke()
x.translate(960,540)
h=l=>x.fillRect(-5,-50,9,l)
r=a=>x.rotate(a)
r(7*t+3)
h(500)
r(t/17-t*7+7)
h(350)

Aug 5 2018 11:16 AM UTC

}// 124/140

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Golfed by removing a lot of accuracy.

u/richev

nice!

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stiaje

remix of d/9108 by u/magna

function u(t) {

with(x)for(i=300;i--;stroke())beginPath(strokeStyle=`hsl(${290-i},99%,60%`),arc(960,1e3,390+i,0,7),font="9em A",fillText('☁️     ☁️',99,250)

Aug 5 2018 11:07 AM UTC

}// 140/140

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Squeezed in some clouds based on golfing by u/magna and the cloud code from u/richev

u/stiaje

Any ideas for more interesting positioning of the clouds?

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joeytwiddle

function u(t) {

['#000','#ff0','#39f','#fff'].map((C,i)=>x.beginPath(x.fillStyle=C)|x.arc(i%2?1050*i-1490:960,i<3?540:840,2310-1305*i+195*i*i,0,7)|x.fill())

Aug 5 2018 9:45 AM UTC

}// 140/140

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James W. Cadle's Flag of _____, with help from mycurvefit.com #flag

u/joeytwiddle

I think this might have been drawn on Dwitter before, but I can't find that dweet right now. I love the simple design!
u/katkip

Me too! It's minimalistic.
u/joeytwiddle

A fun TED talk about flag design: https://www.youtube.com/watch?v=pnv5iKB2hl4

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richev

function u(t) {

c.width|=0
q=6.28
x.stroke()
x.translate(960,540)
h=l=>x.fillRect(-5,-50,10,l)
r=a=>x.rotate(a)
r(q*t+q/2)
h(500)
r(t*q/120-t*q+q);
h(350)

Aug 5 2018 8:21 AM UTC

}// 138/140

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Fast clock hands...ran out of characters to draw the outline of the clock face.

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katkip

remix of d/9112 by u/katkip

function u(t) {

F=n=>{return(t*frame/n%2<1/2)};x.drawImage(c,0,9);for(j=214;j--;)x.fillStyle=F(j^t*60)?"green":"blue",x.fillRect(j*9,0,9,9);time+=1337

Aug 5 2018 7:41 AM UTC

}// 134/140

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Fractalands!

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katkip

function u(t) {

r=q=>(frame/time*1e14)%q;
if(Math.floor(t)%3==0)
{c.width+=0; x.font='3in V';x.fillText(r(10)+1,890,650);}
{return;}

Aug 5 2018 7:33 AM UTC

}// 116/140

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#number #guess #game ! r=q=>(frame/time*1e14)%q; is a random number generator. Try to guess the next number.

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katkip

remix of d/9083 by u/katkip

function u(t) {

F=n=>{return(C(n)^T(n/13.37)*t)%3-1<1};x.drawImage(c,0,l=9);for(j=214;j--;)x.fillStyle=F(j^t*60)?"#362":"#dedbef",x.fillRect(j*l,0,l,l)

Aug 5 2018 7:12 AM UTC

}// 135/140

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The ruins of the temple

u/lionleaf

Looks like a PCB

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richev

function u(t) {

x.lineCap='round'
x.lineWidth=20*t
x.beginPath()
c=6.28*t-1.5
x.strokeStyle=`hsl(${t*72},99%,60%)`
x.arc(960,540,270,c,c+.2)
x.stroke()

Aug 5 2018 6:54 AM UTC

}// 135/140

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Expanding rainbow loop

u/lionleaf

Very satisfying to watch #rainbow #donut

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firegodjr

remix of d/9065 by u/firegodjr

function u(t) {

for(j=100;j--;)for(y=100;y--;)x.fillStyle=R(b=(Math.hypot(j+50*S(t),y+50*C(t))/50*(t*99+(j+y^y-j)))%99*2,b,b),x.fillRect(j*9,y*9,9,9)

Aug 5 2018 5:25 AM UTC

}// 133/140

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u/katkip

Finnaly it doesn't lag.
u/magna

Sweet!
u/fujimotos

#hypot This is the first dweet I ever see that utilizes Math.hypot()
u/aleamb

nice!