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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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magna

remix of d/2419 by u/magna

function u(t) {

c.width|=0;for(j=9;j--;)for(i=100;i--;s=S(t),X=i%5+j*10+s*30,Y=i/5|0,x.fillRect(400+X*10+s**8*Math.random()*3,400+Y*10,10,10));

Apr 5 2017 9:50 PM UTC

}// 127/140

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#default #noise

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magna

function u(t) {

c.style.background=R(w=960,w*S(t))
e=(X,Y,S)=>x.fill(new Path2D(`M${X} ${Y} h${S} l${-S/2} ${S/1.2}`))
e(w,0,w*2)
e(-w,0,w*2)
e(630,540,660)

Apr 3 2017 6:53 AM UTC

}// 140/140

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Another Triforce. Tried fitting a linear gradient, but couldn't.

u/magna

(Note: in case it's not obvious, I'm creating the Triforce by masking the background with huge triangles instead of actually drawing the Triforce's triangles.)
u/magna

#triforce

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cantelope

remix of d/2391 by u/mxfh

function u(t) {

c.width|=s='l280 485h-560'
x.fillRect(0,0,2e3,2e3)
x.fillStyle=`hsl(${t*300},99%,50%`;
x.fill(new Path2D(w=`M960 55${s+s}m840-485`+s))

Apr 2 2017 6:32 PM UTC

}// 134/140

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nowaythisisyourregisterform...

function u(t) {

!c.r&&(c.r=1,c.addEventListener('mousemove',e=>x.lineTo(e.x*c.width/c.offsetWidth,e.y*c.height/c.offsetHeight)&x.stroke()))<!-- Draw :D -->

Apr 2 2017 2:17 PM UTC

}// 140/140

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u/lionleaf

Oh nice! It works in fullscreen too :D
u/lionleaf

haha, your name :P
u/Jenky

Unforunately as I found, e.x/e.y aren't yet implemented in some browsers; if you switch for something like e.pageX/e.pageY they seem to be fine :D - remix with added button-press drawing: https://www.dwitter.net/d/2394
u/nowaythisisyourregisterform...

@lionleaf that register form man...

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AkdM

function u(t) {

with(x)font='15em s',fillStyle=fillText('🤡',830,650),drawImage(c,-20,-10,(1960+(T(t)))+S(t*3),1100)

Mar 29 2017 3:15 PM UTC

}// 99/140

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u/cantelope

this is what i see when i go drinking at the circus

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z3vin

function u(t) {

r=(n)=>Math.random()*n;h=w=1920;with(x)beginPath(),moveTo(0,0),lineTo(r(w),r(h)),stroke(),fillStyle='#fff',fillRect(r(w),r(h*2.5),r(99),h)

Mar 27 2017 4:33 PM UTC

}// 138/140

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A new dawn... a new day

u/mxfh

no need for setting a white fillstyle when there is clearRect
u/z3vin

@mxfh oh yeah I forgot to change that because I was initially trying to work in other colors... duh :(

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tapgiles

function u(t) {

with(x)!t?translate(960,a=540):0,beginPath(),moveTo(a,0),rotate(Math.random()*2-1),lineTo(a,0),strokeStyle=`hsl(${t*100},100%,50%)`,stroke()

Mar 26 2017 7:25 PM UTC

}// 140/140

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joseprio

remix of d/2274 by u/joseprio

function u(t) {

Q=98+(19*C(t)|0)*2;for(c.width=i=1e3;i--;)x.fillStyle=i%2?"#300":"#030",x.setTransform(1,.5-i%2,0,1,i%Q*Q-i,1.5*i),x.fillRect(0,i%2*Q/2,Q,Q)

Mar 23 2017 2:32 PM UTC

}// 140/140

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alech

function u(t) {

c.width=1920;
  for(i=0;i<64;i++){
  x.fillStyle = R(0,t*i%4*64,255*Math.abs(S(t)));
  x.fillRect(30+i*30+S(t)*50,500+(i%16)*20*S(t),20,20)}

Mar 22 2017 4:43 PM UTC

}// 140/140

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mxfh

function u(t) {

i=~~t%4
x.setTransform(a=32,d=i&2?18:0,d?0:57,a,960,540)
x.fillStyle=(b=i&1)?"#C12":"#007"
x.fillRect([6,0,5,-3][i],d?b?0:3.3:5.5,b?i+3:a,a)

Mar 20 2017 5:18 AM UTC

}// 140/140

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Quarter Union Jack in 16:9 ratio

u/mxfh

two more: "9380"[i]-3
u/mxfh

#flag