Dweets awesomed by u/sigveseb

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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mrmcrary

function u(t) {

c.width|=0
  n=new Date
  x.font='100px Arial'
  x.fillText('THE TIME IS:                        '+n.toString().split(' ')[4],100,600)

Dec 29 2017 10:16 AM UTC

}// 134/140

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quuxman

remix of d/4607 by u/quuxman

function u(t) {

x.beginPath()
r=1100
for(i=0;i<355;i+=3.14+C(t/200))x.lineTo(S(i)*r+960,C(i)*r+540)
x.fillStyle=R(c=(S(t)+1)*30,10,c*3)
x.fill('evenodd')

Dec 29 2017 7:36 AM UTC

}// 137/140

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full range of patterns takes ~10.5 minutes

u/iverjo

Impressive tunnel!

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jonathan_b

remix of d/4563 by u/jonathan_b

function u(t) {

for(c.width|=s=490,i=0;i<s*9;)for(j=2;j<16;)r=j*4,x.fillStyle=R(i/j,i/r,s/C(i),3/j),x.fillRect(970+s*C(++i)*C(T(t/++j)+j/r*i),s+s*S(i),r,r)

Dec 29 2017 6:05 AM UTC

}// 139/140

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u/joeytwiddle

#colors

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jonathan_b

remix of d/4592 by u/jonathan_b

function u(t) {

for(c.width|=s=500,i=1,q=s*2;i<q;)for(j=3;j<7;)x.fillStyle=R(i/j,r=j*9,q/C(i/j),24/r),x.fillRect(q+q*C(++i)*C(t*++j+j/j*i),s+s*S(i*j),r,r)

Dec 29 2017 5:08 AM UTC

}// 138/140

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travis575757

function u(t) {

h=o=g=p=a=44;
for(i=a*a;i--;h=i%a-1,g=i-h,o=g/a/a,p=h/a)
for(j=9;j--;o=o+-1*p+C(t),p=o*p+S(t),x.fillStyle=R(o,p,t,1),x.fillRect(g,h*a,a,a));

Dec 29 2017 2:13 AM UTC

}// 140/140

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eskimofo

remix of d/4573 by u/eskimofo

function u(t) {

c.width|=0;r=400
for(i=0;i++<1e3;){y=i*2*Math.PI/t
x.lineTo(960+r/C(y-t),560+r/S(y+t))}x.stroke()

Dec 29 2017 1:57 AM UTC

}// 98/140

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CliffJonesJr

function u(t) {

c.width=96
for(i=0;i++<96;)
for(j=0;j++<54;){
x.fillStyle=R((2-C(t*t*i))*99,(2-S(t*j))*80,(2-C(t*(i+j)))*128)
x.fillRect(i,j,1,1)
}

Dec 29 2017 1:46 AM UTC

}// 131/140

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Technicolor plaid.

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Flopster

function u(t) {

w='white'
for(i=23;i--;)for(j=13;j--;)v=(j<7&&i<11?(i+j)%2?R(0,0,220):w:j%2?w:'red'),x.fillStyle=v,x.fillRect(i*83,j*83+S(t*2+i/3)*7,83,83)

Dec 29 2017 12:41 AM UTC

}// 139/140

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UnacceptableUse

function u(t) {

c.width=1920;
for(i=0;i<1920;i++)
x.fillRect(i,T(t*(i/100))*1000,50,50);

Dec 29 2017 12:09 AM UTC

}// 72/140

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u/berti

72 chars ftw! go you.
u/magna

Golfed down to 56: https://www.dwitter.net/d/4605

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FENRIR

function u(t) {

c.width|=0
c.style.background=R()
x.fillStyle="#fff"
for(i=1e2;i--;p=1e5*S(i),r=9/(4-(p+t)%3),x.fillRect(C(i)*360*r+960,r*i*r,r,r));

Dec 28 2017 11:48 PM UTC

}// 134/140

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