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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.

Theme challenge of the month: #castle

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katkip

remix of d/17266 by u/katkip

function u(t) {

// do you feel good today? increase your depression by removing the following comment:

// eval(`loop(`.repeat(29)+')'.repeat(29))

Jan 17 2020 6:26 PM UTC

}// 130/140

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KilledByAPixel

function u(t) {

with(x)for(c.width|=i=18,scale(25,25);i--;i<9?fillText('♜DWITTER♜'[i],X,23.5,2,fillStyle='#FFF'):fillRect(X-36,16,2,8))X=16+i*4+S(t)*12

Jan 17 2020 5:36 PM UTC

}// 135/140

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KilledByAPixel: #castle #default

katkip: tight

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katkip

function u(t) {

t||(a=X=Y=0)
p=Math.PI/2
s=4
for(i=999;i--;)x.fillRect(999+(X+=S(a*p))*s,540+(Y+=C(a*p))*s,s,s),a+=(S(X)*C(Y)*5+4)^0

Jan 17 2020 5:11 PM UTC

}// 116/140

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katkip: just discovered a curve

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katkip

function u(t) {

r=w=>S(w*1.2+t/9);t||(X=Y=99);for(i=999;i--;)x.fillRect(960+X*500,540+Y*500,1,1),X=r(X-Y),Y=r(X+Y)

Jan 17 2020 4:32 PM UTC

}// 98/140

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ivylab

function u(t) {

c.style.background='gold'
V='X112131414224344415451626361828384849'
for(i=c.width=2e3;i;x.fillRect(V[i--]*Y+T(C(i)*t)*2,V[i--]*Y,Y,Y))Y=182

Jan 17 2020 3:24 PM UTC

}// 139/140

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ivylab: Getting to know T

katkip: lol

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liste

function u(t) {

c.width|=0
x.font='100px s'
f=()=>x.fillText('🏰',i%2120-100,(i/1920)*100)
for(i=2.5e4;i>0;f(),i-=500+t*9,f(),x.globalAlpha*=0.91);

Jan 17 2020 3:22 PM UTC

}// 130/140

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liste: Parallax #castle in snow

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katkip

remix of d/17232 by u/katkip

function u(t) {

c.width=400
f=(a,b)=>S(S(a*2)*C(b*2)+t*9)<C(a*2)-S(b*2)
for(i=200;i--;)for(j=113;j--;){x.fillStyle=R(f(i/8,j/8)*99),x.fillRect(i*2,j*2,2,2)}

Jan 17 2020 12:30 PM UTC

}// 140/140

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katkip: #loop

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ForkNet

function u(t) {

with(x)for(c.width|=i=400,translate(960,940);i--;scale(w=1.4,w))q=(a=i+t*60|0)%99!=0,fillStyle=R(i*q),fillText(q?'—':'🍩',0,(q+S(t)**2)*3)

Jan 17 2020 11:14 AM UTC

}// 137/140

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ForkNet: I’m new

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pavel

function u(t) {

for(x.beginPath([X,Y=X,r=X]=t?d.shift():d=[666]),i=4;i--;i&&d.push([X+p/2,Y-q/2,r/2]))p=r*S(b=i*2.094),q=r*C(b),x.lineTo(X+p,Y-q);x.stroke()

Jan 17 2020 3:48 AM UTC

}// 140/140

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pavel: Incremental #sierpinski

katkip: #fractal

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pavel

function u(t) {

X=450
c.width|=f=(r,a,o)=>r>9?f(r/=2,a-o,-o)+f(r,a,o)+f(r,a+o,-o):(t-=.02)>0&&x.lineTo(X+=r*C(a*=355/339),Y+=r*S(a))
f(Y=1e3,0,1)
x.stroke()

Jan 17 2020 3:27 AM UTC

}// 140/140

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pavel: One stroke #sierpinski

tylertoomey: Wow, this is phenomenal!
katkip: #curve #sfcurve

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