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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/3044 by u/rybar

function u(t) {

for(i=1e3;i--;x.fillRect(i%X*X,i/X*X,X,X))x.fillStyle=R(X=80,255*S(i/t),255*C(i/t))

Aug 9 2017 8:59 PM UTC

}// 83/140

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Xen

remix of d/2355 by u/cantelope

function u(t) {

x.save(),x.translate(y=960,540);for(i=69;i--;x.fillStyle=`hsla(${i*9+t},99%,40%,.1`,x.fillRect(a=i*9,a,-a,-a),x.rotate(C(t)*.4));x.restore()

Aug 6 2017 8:41 PM UTC

}// 140/140

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cagr30

function u(t) {

c.width=w=270
for(i=8;i--;)h=54*(3*t+i)%w,a=i<5,b=i>6,x.fillRect(w/2+(a?0:b?-7-45*S(t):w*(i-5.5)/2),a?h:b?96:5,b?20:3,5*(a?2:(b?9:2*w)))

Aug 1 2017 3:58 PM UTC

}// 137/140

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u/itsjustmustafa

3000th dweet, nice
u/ximavus

yay dweet 3000

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New_Core

remix of d/2962 by u/FireFly

function u(t) {

a=c.width|=0;for(i=40;i--;x.fill())i%2>0?a=500:a=0,x.fillStyle=`hsla(${i*9},99%,50%,.4)`,x.lineTo(960+a*S(i*.698+t),i>20?a:-a+999)

Jul 31 2017 6:25 PM UTC

}// 130/140

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Made my own little try to reduce the code a bit..

u/Xen

125b my try #2983
u/FireFly

Nice! the i%2>0 can be further simplified to i%2 for another -2ch (applies to xen's too)
u/13thptr

#diamond #d3

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FireFly

function u(t) {

for(Y=540,x.beginPath(c.width|=i=40);i--;x.lineWidth=8)x.lineTo(X=i*50,Y),x.lineTo(X,Y=540+C(i*99+t*4)*S(i/13)*400);x.fill()

Jul 31 2017 1:36 AM UTC

}// 124/140

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Corkscrew-like thingy!

u/FireFly

I realised with this one that the beginPath is actually redundant since we're resetting the canvas state each frame anyway… whoops

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jmf

function u(t) {

//From line to circle
a=6.2831
c.width=1920
x.beginPath()
for(i=0; i<a; i+=a/t){
x.lineTo(S(i)*300+960, C(i)*300+600 )
}
x.stroke()
x.fill()

Jul 30 2017 8:03 AM UTC

}// 140/140

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Rybar

function u(t) {

c.width=2e3;
  for(i = 0; i < 2e3; i++){
    o = 0.00314 * i,x.fillRect((960 + S(t-o)*500*C(i/3) ), 800*C(i/900) + C(t-o)*300, 10,10 )}

Jul 27 2017 2:02 PM UTC

}// 135/140

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Xen

remix of d/2012 by u/kchplr

function u(t) {

for(X=i=8;i--;r=T*2,x.fillText(i,960+S(T%7)*(r+=C(T*7)*t),540+C(T%7)*r))T=t*i

Jul 25 2017 4:13 PM UTC

}// 77/140

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u/cantelope

X= seems to be unused?
u/Xen

well spotted :-)

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kchplr

remix of d/2842 by u/alien

function u(t) {

c.width=120
for(j=0;j<68;j++)
for(i=0;i<120;i++){
q=(i*i*j*j*8+frame*8)&768
s=100*C(q)%255
s<0&&x.fillRect(i,j,1,1)}

Jul 24 2017 9:36 PM UTC

}// 117/140

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u/alien

:D!!!
u/Xen

95bytes for you: c.width=123;for(j=70;j--;)for(i=130;i--;s=C(q=(i*i*j*j*8+frame*9)&768)<0&&x.fillRect(i,j,1,1));
u/Xen

95bytes for you: c.width=123;for(j=70;j--;)for(i=130;i--;s=C(q=(i*i*j*j*8+frame*9)&768)<0&&x.fillRect(i,j,1,1));
u/kchplr

81bytes for me :p : for(c.width=i=130;i--;)for(j=70;j--;)x.fillRect(i,j,1,C(i*i*j*j*8+frame*8&768)<0)

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Xen

remix of d/1504 by u/innovati

function u(t) {

for(i=1e4;i--;x.fillRect(i,i/t,i/t,t)){x.fillStyle='hsl('+i*i+',99%,50%)'}

Jul 19 2017 6:28 PM UTC

}// 74/140

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u/innovati

Beautiful 🌈
u/Xen

Thank you, Plasma pillars :D