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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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Xen

remix of d/18671 by u/nml

function u(t) {

for(c.width|=i=1e3;i--;x.fillRect(i*99-(t*i*99%99),0,50,2e3))x.fillStyle=`hsl(${i*9+t*99},50%,50%)`

May 8 2020 11:57 PM UTC

}// 99/140

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Golf and test

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AOctavio

function u(t) {

c.width=1920
x.fillStyle=(R(99*S(t),99*C(t),99*T(t)))
for(i=0;i<9;i++)
x.fillRect(300+S(i*11)*100+T(t)*30,550,100*C(t),500*C(t))

May 8 2020 5:57 PM UTC

}// 128/140

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I made it wackier

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wing_clover

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<13;i++)
x.fillRect(800+i*S(t)*30,(C(t)+i)*90,50*i,50) // draw 50x200 rects

May 6 2020 2:29 PM UTC

}// 117/140

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floating bridge

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bandaloo

remix of d/13300 by u/bandaloo

function u(t) {

c.width|=0;for(i=1952;i-=32;x.fillStyle=R((1+C(i))/2*255,0,155))for(j=3;j--;)x.fillRect(i+j,536+C(i+j+t)*50,32,8)

May 5 2020 2:18 AM UTC

}// 113/140

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golfed version of my first dweet

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WasifBoomz

function u(t) {

x.strokeRect(0,0,1920-t*20,1080-t*20)
x.fillStyle=R(255-10*t,255-10*t,255-10*t)
x.fillRect(0,0,1920-t*20,1080-t*20)

May 3 2020 5:23 AM UTC

}// 115/140

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#cavern

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trusktr

function u(t) {

eval(unescape(escape`𨰿𚁣𛡰𨑲𩑮𭁎𫱤𩐮𬁲𩑰𩑮𩀨𙱭𫱶𩐠𫑯𭑳𩐧𚐬𨰽𜀬𭠽𜀬𫱮𫑯𭑳𩑭𫱶𩐽𩐽🡻𭠽𝑥𛐴𚡥𛡣𫁩𩑮𭁘𯐩𞠰𒡷𪑴𪀨𮀩𩡯𬠨𪐽𞀰𞱩𛐭𞱦𪑬𫀨𚐩𨡥𩱩𫡐𨑴𪀨𚐬𨑲𨰨𞐶𜀫𪐪𝐪𤰨𪐫𭀩𛀶𜀰𛁩𚠲𜀬𨐽𜠫𭠪𤰨𪐯𞐫𭀩𛁡𚰴𛠲𚐬𩡩𫁬𤱴𮑬𩐽𤠨𜀬𪐪𝐬𪐪𝠩`.replace(/u../g,'')))

May 2 2020 11:52 PM UTC

}// 140/140

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Remix of d/18574 with mouse movement

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rodrigo.siqueira

function u(t) {

for(i=2e3;i--;)x.fillRect(940+S((t-4)*i/80*t)*i,580+(t-4)*145,1,2)

Apr 30 2020 8:25 PM UTC

}// 66/140

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Simple Trigonometric Patterns in 66 bytes.

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Xen

function u(t) {

t?x.strokeStyle="#"+(49*t|0):x.fillRect(0,0,Z=2e3,Z)
x.strokeRect(7*t*Z%Z,t*Z%Z/2,69,69)
x.drawImage(c,C(t)/2,S(t)/2)

Apr 30 2020 3:32 PM UTC

}// 117/140

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just an effects test

u/KilledByAPixel

it has potential try a larger line width!
u/rodrigo.siqueira

May be something like this? x.lineWidth=9;t?x.strokeStyle=hsl(${t*99},90%,60%:x.fillRect(0,0,Z=2e3,Z);x.strokeRect(S(t*Z)*Z%Z,t%2*540,69,69);x.drawImage(c,S(t),C(t))
u/rodrigo.siqueira

(missing backtick around hsl in comment)

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myro

remix of d/18548 by u/myro

function u(t) {

w=c.width=1e3
for(i=0;i<w;i++){
r=240**S(i+t/2)
a=8*T(i+t/8e9)
u=2*r*C(a)
v=r*S(a)
x.fillStyle=R(a,r,w*C(t))
x.fillRect(u+w/2,v+w/4,20,20)}

Apr 29 2020 11:55 PM UTC

}// 139/140

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blossom

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Whimpers

function u(t) {

x.fillRect(960+C(t)*(h=300-(t>6.28&&t*11)),540+S(t)*(h),C(t)*300,S(t)*300)

Apr 28 2020 11:19 PM UTC

}// 74/140

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#circlechallenge