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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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prawnwarp

remix of d/2577 by u/prawnwarp

function u(t) {

c.width|=0;for(i=-960;i<960;i+=48){for(j=-540;j<540;j+=48){s=S(i*0.005+t*0.005*j)*24;x.fillRect(960+i-s,540+j-s,s*2,s*2);
}}

May 2 2017 2:00 AM UTC

}// 124/140

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magna

remix of d/2635 by u/magna

function u(t) {

c.width|=0
x.globalCompositeOperation='xor'
for(i=55;i--;x.lineWidth=30,x.stroke())x.beginPath(),x.arc(960,540,i*20,a=t*5+i/9,a+Math.PI)

Apr 30 2017 1:31 AM UTC

}// 136/140

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u/donbright

groovy
u/magna

#spiral

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magna

remix of d/2630 by u/magna

function u(t) {

for(i=c.width=w=192;i--;)for(j=w;j--;b=i%8^(X+Y&1^f)*7,'ĒőäƈÓäŉĊ'.charCodeAt(j&7)-w&1<<b^f<<b&&x.fillRect(i,j,1,1))X=i>>3,Y=j>>3,f=t*X/Y&1

Apr 28 2017 3:43 PM UTC

}// 138/140

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saschavoid

remix of d/2606 by u/New_Core

function u(t) {

i=h=c.width|=0;d=~~(h-t%30*60);while(i--)x.fillRect(i,a=700+200*T(t+i/599)*T(t+i/-10),1,h),i==d?b=a:0;

Apr 28 2017 11:33 AM UTC

}// 102/140

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I just find it mesmerazing.

u/donbright

remix https://www.dwitter.net/d/2644

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rileyjshaw

remix of d/2619 by u/rileyjshaw

function u(t) {

c.width|=0
x.globalCompositeOperation=C(t*=2)<0&&'xor'
for(i=2;i--;x.fill())
x.beginPath(),x.arc(960-S(t)*540*i,540,(2-i)*100,0,7)

Apr 27 2017 3:47 PM UTC

}// 130/140

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Bit of golf…

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rileyjshaw

remix of d/2608 by u/rileyjshaw

function u(t) {

c.width|=0
for(i=-9;i++<99;x.globalCompositeOperation='xor')x.fillRect(i*30,0,S(t/3)*99,2e3)
while(i--)x.fillRect(0,i*15-99,2e3,C(t/5)*40)

Apr 26 2017 8:59 PM UTC

}// 138/140

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Looks nice with themes, eg:

u/rileyjshaw

c.style.background='#000';x.fillStyle='#080'

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MrM@_S

function u(t) {

W=c.width=255;for(i=96;i--;j=i>>2,x.fillText((u+x)[t&W],j?X=(3*j%8*33*t+i*W)%W:W/2,j?Y=j*9:Z*9))!t||j==Z&&(X-W/2)**2<W*4?Z=0:onclick=e=>Z++

Apr 26 2017 4:20 PM UTC

}// 139/140

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[Quine Game]? based off of https://www.dwitter.net/d/2559

u/joeytwiddle

I was not expecting that!

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sfz

remix of d/2515 by u/sfz

function u(t) {

c.width|=w=213
h=120
d=t?~~(t*60)%9?d:new Date%4:0
x.x=x.x||w
x.y=x.y||h
x.x+=d<2?2*d-1:0
x.y+=d>1?2*d-5:0
x.fillRect(x.x%w*9,x.y%h*9,99,99)

Apr 18 2017 7:43 AM UTC

}// 140/140

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Bit shoddy roomba

u/sfz

Or a cat toy!
u/Polyducks

It's alive!

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sfz

function u(t) {

w=213
h=120
d=t?~~(t*60)%9?d:new Date%4:0
x.x=x.x||w
x.y=x.y||h
x.x+=d<2?d<1?1:-1:0
x.y+=d>1?d>2?1:-1:0
x.fillRect(x.x%w*9,x.y%h*9,9,9)

Apr 18 2017 1:27 AM UTC

}// 135/140

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eruonna

function u(t) {

a=[0,-9,0,9,0]
if(!t){n=0;d=0;b=380;c=830;x.moveTo(a,b)}
d+=((n&-n)<<1)&n++?1:3;d%=4
b+=a[d];c-=a[d+1]
x.lineTo(b,c);x.stroke()

Apr 17 2017 10:36 PM UTC

}// 127/140

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Totally different dragon curve implementation with 13 fewer bytes and it correctly draws the first segment

u/eruonna

okay, not sure if it is worth kicking out yet another version to get the positioning right
u/eruonna

okay, not sure if it is worth kicking out yet another version to get the positioning right
u/donbright

color - - a=[0,-9,0,9,0] if(!t){n=0;d=0;b=380;c=830} d+=((n&-n)<<1)&n++?1:3;d%=4 b+=a[d];c-=a[d+1] x.fillStyle=R(128+n%256,64+n%128) x.fillRect(b,c,9,9)