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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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Current theme challenge: #Food

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tactical_retard

remix of d/23621 by u/tactical_retard

function u(t) {

eval(unescape(escape`󡬽󫜽󟭭󙜲󟬱󟼨󫜥󜜭󛬵󚜪󜬺󚌱󚼭󫜥󜜭󛬵󚜪󜬊󬬽󚍍󟝍󨝴󪌩󛭲󨝮󩍯󫜊󩭯󬬨󪜽󨜽󜭥󜼻󪜭󛜻󣜮󨝢󬼨󦜭󝜰󜌫󡬨󦌯󦜩󚬵󜌰󚜾󝬰󚭴󙬦󚍸󛭦󪝬󫍒󩝣󭌨󦌬󦜬󜬰󛌲󜌩󚜩󦌽󬬨󚜪󨜬󦜽󬬨󮌮󩭩󫍬󤽴󮝬󩜽󨍨󬽬󚌤󮼶󜌪󭍽󛌹󞜥󛌳󝜥󨌩󚭡`.replace(/u../g,'')))

Sep 7 2021 3:41 PM UTC

}// 129/140

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better triangle wave function: F=m=>Math.abs(1-m%2)*2-1

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rodrigo.siqueira

remix of d/23711 by u/rodrigo.siqueira

function u(t) {

s=470,A=a=b=t/s
for(i=1e4;--i;b=A,A=a)x.fillRect(910+a*s,460+b*s,.7,t<3),a=Math.abs(A*.7+1/b/2e4)*(A/15+S(a+1)/.55)-b
x.fillStyle=R(b*s,s/9)

Aug 31 2021 9:48 PM UTC

}// 140/140

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Leaf veins

u/rep_movsd

#underrated

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TGY

remix of d/23702 by u/TGY

function u(t) {

u=.9
Y=X=Math.random()
for(i=1e3;i--;x.fillRect(X*400+700,Y*400+700,1,1))a=X,X=1+u*X*C(T=.4-6/(1+X*X+Y*Y))-u*Y*S(T),Y=u*a*S(T)+u*Y*C(T)

Aug 31 2021 2:48 PM UTC

}// 135/140

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Ikeda map

u/Xen

nice!

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e4494s

function u(t) {

with(x){c.width+=0;for(i=0;i<400;i++){T=-t+i*15;fillStyle=R(255,i*.7,0);beginPath();arc(960+i*3*C(T),540+i*3*S(T),100,0,7);fill()}}

Aug 31 2021 3:27 AM UTC

}// 131/140

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Flower tunnel

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TGY

function u(t) {

for(c.width|=w=i=214;i--;)
for(y=62+8*S(p=t+i/45)**2;y++<120;x.fillRect(9*i,9*y|0,9,9))
x.fillStyle=R(g=80+45*S(p+y/20)**2,g+y/9,3*g)

Aug 29 2021 1:02 PM UTC

}// 133/140

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#windows11

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ArthurThuczsec

remix of d/16349 by u/bencoveney

function u(t) {

for(i=200;i--;x.fillStyle=R(C(q)*i,S(-q)*i,S(q)*i))x.fillRect(980-i*4+C(q=i*t/9*t+i)*i,540-i*3+S(q)*i,8*i,6*i);

Aug 26 2021 6:17 PM UTC

}// 111/140

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ArthurThuczsec

remix of d/23641 by u/rodrigo.siqueira

function u(t) {

with(x)for(t?i=m:translate(m=986,540);i--;fillRect(i,z,m/2,4))fillStyle=R(z=6e4/i*S(t),z*S(t/i),z/C(t+i),.1),rotate(T-(T=i/2+t))

Aug 24 2021 11:02 PM UTC

}// 128/140

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128 Meganova.

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TGY

function u(t) {

t||(a=0)
for(i=c.width=60,onmousemove=e=>a=e.x/240;i--;x.fillRect(i,0,d,20/d))d=S(S(a+i/60))

Aug 23 2021 3:45 PM UTC

}// 92/140

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wolfeinstainy

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kmoseni

remix of d/4970 by u/doof

function u(t) {

t||x.translate(960,540)
x.rotate(1e-4/t)
x.drawImage(c,-980,-560,1960,1120)
x.fillStyle=`hsla(${t*60},50%,50%,.3)`
x.fillRect(0,0,1,1e5)

Aug 23 2021 3:43 PM UTC

}// 136/140

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Smooth spiral

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tactical_retard

function u(t) {

c.width=t*100
s=256+(2**~~t)
for(i=s*s;i--;x.fillRect(X,Y,1,1)){
X=0|i/s
Y=i%s
d=(X*X+Y*Y)**.5
b=X*d&Y*d
x.fillStyle=R(b,b,b)
}

Aug 20 2021 2:16 AM UTC

}// 127/140

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warped #sierpinski

u/384.cz

amazing