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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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tato

function u(t) {

//c.width=1920
for(i=0;i<1920;i++){
x.fillStyle=R(255*S(t*i/960), 255*C(t*i/480),255*S(t*4))
x.fillRect(i,540+540*C(t+S(i*4)), 8, 8)
}

May 21 2021 3:46 PM UTC

}// 134/140

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stripes

u/Xen

nice!

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Agnes

function u(t) {

P=3.14;for(c.width|=i=10;--i;x.fillRect(0,0,1,1))a=(i/3+t)%(2*P),x.setTransform(a<P/2||a>3*P/2?50*C(a):0,0,0,200,860+200*S(a),440)

May 17 2021 10:33 AM UTC

}// 130/140

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Cylindrical default

u/Agnes

#default

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TGY

function u(t) {

t?c.width=2e3:a=[]
c.onclick=e=>a.push(6e2)
x.fillStyle=R(54,23,78)
a.map((e,i)=>x.fill(x.arc(2e2+3*e,600,e&&(a[i]-=e/20),0,6.29)))

May 10 2021 11:22 AM UTC

}// 131/140

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click the canvas :-)

u/aleamb

#interactive

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Agnes

function u(t) {

with(x)for(M=2e3;--M;strokeStyle=`hsl(180,${M%99}%,50%)`,beginPath(stroke()))arc(960+M*S(t+M),540+M*C(M),M,0,7);

May 8 2021 10:26 AM UTC

}// 112/140

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Whirlpool

u/magna

Love the style!

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lerc

remix of d/22653 by u/Xor

function u(t) {

for(c.width=i=h=960;i-->0;){
n=C(i+t);q=S(i/152)
n>0?0:x.fillRect((i*h/2-i*i)**.5*S(i+t)+h/2,i,n*n*9*q,9*(q**.3))
}

Apr 30 2021 7:02 AM UTC

}// 115/140

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Did some tweaks for changing size of rects for maybe some 3d effect

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erin

remix of d/10794 by u/jylikangas

function u(t) {

for(c.width=i=v='-1';i++<7;v+=1)x[f='fillText'](`U`+v*.5,173-i*5,i*9),x[f](8,X=99-T(i*i+t/i)*99,345-X*2),x.fillRect(i*39,99+S(t+i)*9,39,1e3)

Apr 29 2021 7:21 AM UTC

}// 140/140

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i tried to make a waterpark but ended up just making the slide to lava in Hell.

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pavel

remix of d/22643 by u/Xor

function u(t) {

for(c.width|=i=11;i--;){
x.beginPath()
x.setLineDash([n=2**(i+t%1)])
x.lineWidth=n
x.lineTo(0,h=3*n/2)
x.lineTo(2e3,h)
x.stroke()
}

Apr 28 2021 7:59 PM UTC

}// 131/140

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Using setLineDash as otherwise its too slow to draw all the squares

u/Xor

Neat!

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Xor

function u(t) {

for(c.width=i=h=960;i-->0;)x.fillRect((i*h/2-i*i)**.5*S(i+t)+h/2,i,9,9)

Apr 28 2021 5:30 AM UTC

}// 71/140

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My Sphere

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Xor

function u(t) {

c.width=a=960;for(i=0;i<a;i+=5)x.fillRect(S(i+t)*i/2+a/2,i,9,9)

Apr 28 2021 4:55 AM UTC

}// 63/140

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Tree

u/Xor

Try incrementing by 4 or 6!
u/andrea270872

nice... for some reason 5.2 works also nicely :D

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lars-erik

remix of d/22616 by u/lars-erik

function u(t) {

c.width=w=110,f=Math.floor,o=f(t*20),b=120
c.style.filter=`blur(3px`
for(z=w;z--;)for(y=96;y--;)if(f((z+o)*y*2)%b==0)x.fillRect(z-1,y,3,3)

Apr 24 2021 1:37 PM UTC

}// 138/140

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I have no idea what I'm doing™ #4.4