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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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magna

function u(t) {

c.width|=i=64;for(;i--;)for(x.setTransform(1,0,0,1,i%8*240,(i>>3)*135),j=25;j--;)x.fillRect(120+C(t*i/19+j/(i+1))*50,67+S(t+j/4)*50,5,5)

Jan 26 2018 1:04 AM UTC

}// 136/140

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BirdsTweetCodersDweet

remix of d/6460 by u/njm

function u(t) {

x.fillStyle=`hsla(${t*90},50%,50%,.5)`;x.fillRect(910+t*15*T(t),490+t*15*S(t),50,50);x.font='120px x';x.fillText("treme", 1065, 567);

Jan 25 2018 10:55 PM UTC

}// 133/140

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Changed the shape, golfed a little, and added a little something from myself ;D

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sj_

function u(t) {

for(i=0;i<50;i++){x.fillStyle=`hsla(${30+i*10},70%,${50+i}%,.7)`
x.fillRect(-700-(C(t)*700)+80*i,-100+S(800*i)*t,50,50/t*50)}

Jan 25 2018 3:14 AM UTC

}// 125/140

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u/njm

Very cool idea! Hope you like my remix

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@no_identd

remix of d/6447 by u/DirtyDan

function u(t) {

c.width=1920
for(i=b=540;i>0;i-=.5)x.beginPath(),x.ellipse(a=960+i*S(t+i*2.5),((i**2.214297)/i+i+200)/2,i/b*200,i/b*50,0,0,44/9),x.stroke()

Jan 25 2018 1:56 AM UTC

}// 139/140

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This one has an illusion built in. You can mentally switch the rotation of what you see, which you may perceive as a 3D shape.

u/@no_identd

Also, if you add x.globalCompositeOperation='xor', like u/DirtyDan did here: https://www.dwitter.net/d/6430, you can STILL mentally flip it.
u/@no_identd

Actually, I've noticed, u/DirtyDan's original of this also has this illusion built in!

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Qwitter

function u(t) {

w=c.width^=0;for(i=12;i--;x.beginPath()){k=7*t+t*t;p=k+i*6.3/12;x.arc((125.6*k)%(2*w)-110,w/4,200,p,p+1/2);x.lineWidth=99;x.stroke();}

Jan 24 2018 9:16 PM UTC

}// 134/140

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Ludicrous Speed <i>GO!</i>. <sup>refresh</sup>

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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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yonatan

remix of d/6402 by u/yonatan

function u(t) {

x.drawImage(c,(q=S(t)*20)-40,-60,2e3+q,1200)
for(i=0;i++<1920;x.fillRect(i,540+S(i)*9,1,1))x.fillStyle=`hsl(${t*i*i%360},99%,50%`

Jan 24 2018 2:36 AM UTC

}// 130/140

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u/donbright

fascinating

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41407

function u(t) {

w=c.width;h=c.height;p=Math.random;x.fillStyle=~t%2==0?'purple':'teal';x.fillRect(p()*w,p()*h,7,7);x.drawImage(c,-10+p(),-5.1,w*1.01,h*1.01)

Jan 23 2018 6:42 PM UTC

}// 140/140

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u/donbright

thats quite interesting how it eventually evolves into little point lights
u/41407

Yeah, I came up with this trying to figure out how to implement a starfield type thing

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Qwitter

function u(t) {

w=500;c.width=4*w;for(i=150;i--;x.fillText('dweet',p*w*5,w+4*w*p*S(t+d)) ){d=i/10;p=1/(1+i+.4*S(7*t+i));s=p*w;x.font=s+'px courier new';}

Jan 23 2018 6:05 PM UTC

}// 137/140

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Xen

remix of d/6352 by u/BackendForth

function u(t) {

for(c.width|=i=96;i--;)for(j=54;j--;x.fillRect(i*20,j*19,g,g))g=9+9*S(((i-t)**2+(j-49)**2)**.3+S(t)*j*Math.atan2(j*t,i-t)+t*29)

Jan 23 2018 5:05 PM UTC

}// 127/140

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