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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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yonatan

remix of d/6432 by u/yonatan

function u(t) {

t?c.width|=0:a=[]
for(i=z=960;i--;x.fillRect(X,Y,9,9))[X,Y,I,J,L]=a[i]||[],a[i]=L?[X+I,Y>z?z:Y+J,I,Y>z?J*-.8:J+1,L-1]:[z,z,J%2,-i%70,i*9]

Jan 24 2018 8:40 PM UTC

}// 138/140

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particle fountain

u/Qwitter

They seem so happy.
u/donbright

awesome awesome awesome
u/iverjo

#bounce

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yonatan

function u(t) {

t?c.width|=0:a=[]
for(i=z=960;i--;x.fillRect(X,Y,9,9))[X,Y,I,J,L]=a[i]||[],a[i]=L?[X+I,Y>z?z:Y+J,I,Y>z?J*-.8:J+1,L-1]:[z,0,S(i*t)*3,0,i*9]

Jan 24 2018 8:39 PM UTC

}// 138/140

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u/donbright

interesting way to do particles, looks really good
u/donbright

interesting way to do particles, looks really good

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21medals

function u(t) {

c.width^=0
x.globalCompositeOperation="xor"
for(i=0;i<40;)
x.fillRect(960,540,C(t*i/16)*i*13,S(t*i/16)*i++*13)

Jan 24 2018 8:32 PM UTC

}// 110/140

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u/Qwitter

Cool
u/DirtyDan

Cool, rectangle corners following a spiral pattern
u/innovati

Beautiful!

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DirtyDan

remix of d/6409 by u/DirtyDan

function u(t) {

c.width=1920
x.globalCompositeOperation='xor'
for(i=b=540;i>0;i-=3)x.beginPath(),x.ellipse(960+i*S(t+i),i*2,i/b*99,i/b*50,0,0,44/7),x.fill()

Jan 24 2018 8:25 PM UTC

}// 140/140

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u/Qwitter

Mercurial
u/Qwitter

like ⚚
u/donbright

snakes!

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bepisTM

function u(t) {

c.width=32;d=new Date();with(x)moveTo(9+6*S(H=d.getHours()/1.9),9-6*C(H)),lineTo(9,9),lineTo(9+9*S(M=d.getMinutes()/9.6),9-9*C(M)),stroke()

Jan 24 2018 8:00 PM UTC

}// 139/140

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(this is a fully functional clock)

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BirdsTweetCodersDweet

function u(t) {

c.width^=a=(~~t).toString(2).split('');a.forEach((v,i)=>+v&&x.fillRect(i*50,540,50,50))

Jan 24 2018 7:53 PM UTC

}// 87/140

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It's binary time! Literally... Enjoy this simple binary representation of t, in just 87 characters :O! Big thanks to u/bepisTM u/chobbit u/cuteness for the 117=>88 character slicing :D You guys are awesome...

u/veubeke

A bit shorter: c.width^=0;for(i=32;i--;)t>>i&1&&x.fillRect(i*50,540,50,50)
u/BirdsTweetCodersDweet

Yeah, but that goes backwards :P... But still - 59 CHARS :O...

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bepisTM

function u(t) {

for(c.width=X=96;X--;)for(Y=54;Y--;)x.fillRect(X,Y,Math.random()>.5?1:0,1)

Jan 24 2018 7:07 PM UTC

}// 74/140

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FrenchToast

function u(t) {

c.width = 2e3;
for(j=3000;j--;){
L=500 + 500*S(j/1000*t*t);
x.fillStyle=R(0,0,L%300);
x.fillRect(j,L,15,15);
}

Jan 24 2018 6:53 PM UTC

}// 110/140

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Blane

function u(t) {

c.width^=0;for(i=99;i--;x.fill())x.fillStyle='hsl('+29*(C(t+i))+',99%,50%)',x.beginPath(),x.arc(99*(t%31+i*.1)-1.1e3,540+99*S(t+i*.1),i,0,7)

Jan 24 2018 5:48 PM UTC

}// 140/140

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u/aleamb

great
u/Qwitter

life like... Im glad that thing swam away from me :)

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aleamb

function u(t) {

for(i=s=33;a=s*s,i--;)for(d=t*1e8&1<<i;a--;)m=a%s,n=a/s,x.fillStyle=R((m^n)*70),x.fillRect(((d?s-m:m)+s*i)*3,n*3,3,3);x.drawImage(c,0,96)

Jan 24 2018 3:55 PM UTC

}// 137/140

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Building an infinite maze.

Show more comments…
u/aleamb

I did not have space for Math.random, so i have used the decimals from t variable multiplying by 1e8 and then extract one variable bit for true/false condition. Thus it is not true random
u/aleamb

Better said, it is worst than Math.random
u/donbright

kewl
u/aleamb

#maze
u/rep_movsd

Similar ones I did (inspired by 10PRINT)
u/rep_movsd

Similar ones I did (inspired by 10PRINT)
u/rep_movsd

https://www.dwitter.net/d/15089 and https://www.dwitter.net/d/15107