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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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New_Core

function u(t) {

a=c.width=2e3;for(j=15;j--;){q=j*9;for(i=50;i--;)x.lineTo(i*(40+q),(99-j*5)*S(t*j*.5+i)+300+j*60);x.lineTo(0,a);x.lineTo(a*2,a);x.stroke()}

Apr 21 2017 12:08 PM UTC

}// 139/140

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a quick paralx idea, ofcourse would been nicer filled in colors ;) wonder if it can be shorten enough for that.

u/donbright

remix https://www.dwitter.net/d/2547
u/lionleaf

Reminds me of https://www.dwitter.net/d/113
u/joeytwiddle

More sine waves here https://www.dwitter.net/d/1509 ;)
u/13thptr

#parallax

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eruonna

remix of d/2522 by u/magna

function u(t) {

c.width|=0
t?0:n=0
onkeyup=e=>n++
x.font='50px monospace';
((u+'').slice(0,n%154)+' |'[t&1]).split('\n').map((r,i)=>x.fillText(r,0,++i*50))

Apr 18 2017 6:27 PM UTC

}// 139/140

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Hacker typer

u/sigveseb

nice
u/magna

Can be used when your boss catches you looking at dwitter.net at work.

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eruonna

function u(t) {

for(c.width&=i=-9;i<9;i++,x.fillStyle=`hsl(${9*i},99%,50%`,x.beginPath(),r=i*40,x.arc(960+r*S(t/Math.abs(i)),540+r*C(t/i),20,0,6),x.fill());

Apr 14 2017 8:43 PM UTC

}// 140/140

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u/donbright

fascinating that they dont seem to overlap (ever?)

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Woodmouth

function u(t) {

if(t==0){a=99;b=a;d=0}
m=Math
x.fillRect(a+=9*m.sin(d),b+=9*m.cos(d),9,9)
d+=m.random()-.5
if(b>1080)d=3
if(b<0)d=0
if(a>1920)d=5
if(a<0)d=2

Apr 11 2017 6:16 PM UTC

}// 140/140

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Let me know if you find a better way to keep the "fly" within the canvas. (Other than 4 if-statements i mean)

Show more comments…
u/reportbase

You should use fillstyle to vary the color a little i think.
u/Artfarnaa

You can use C instead of m.c.
u/donbright

t?x.fillRect(a+=9*S(d),b+=9*C(d),9,9):(b=a=99,d=0) d+=Math.random()-.5 d=b>1080?3:(b<0?0:(a>1920?5:(a<0?2:d)))
u/donbright

that will free up 30 characters. line split before d+ and d=b
u/joeytwiddle

Nice compass movement! I like don's if?then:else but i think his (parentheses) can be left out
u/joeytwiddle

An alternative is to wrap around: fillRect(a=(1920+a+9*S(d))%1920,b=(1080+b+9*C(d))%1080,9,9)
u/z3vin

this is so frickin' cool! combo of joey n dons 96 chars: t?x.fillRect(a=(1920+a+9*S(d))%1920,b=(1080+b+9*C(d))%1080,9,9):(b=a=99,d=0),d+=Math.random()-.5
u/Woodmouth

Thanks, that looks really good. Still looking for an actual boarder though, just because of how cute it is when it keeps bumping into the wall.
u/Woodmouth

Ohh, nvm, Donbright does that. (I was just looking that the combo)
u/New_Core

maybe a x% less chance going the direction against a border the closer it gets to it could make a nice pattern. (just an idea, dont know how to do it)
u/donbright

nice work @joeytwiddle is correct abt my parenthesis

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shapes

remix of d/2431 by u/shapes

function u(t) {

r=480;c.width=r*4;λ=0;for(φ=a=1.56;φ>-a;φ-=1.56/r){λ+=a;x.lineTo(C(φ)*S(λ-t/2)*r+2*r,(C(t=t+φ/r)*S(φ/4)+S(λ)*C(t/2)*C(λ-t))*r+r)}x.stroke()

Apr 6 2017 5:49 PM UTC

}// 139/140

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u/magna

Love it!

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magna

remix of d/2367 by u/magna

function u(t) {

c.width=w=400
with(x)filter=`blur(${t&2}px)sepia(1)contrast(2`,font='15em a',fillText('🚃🚃',0,w/2+t%3),fillRect(Math.random()*w,X=0,1,w)

Apr 1 2017 4:40 PM UTC

}// 135/140

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u/codeslaw

Like an old tv :D
u/magna

Works best on Chrome on macOS
u/donbright

didn't know they made speed 3
u/magna

#film #train

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donbright

remix of d/2372 by u/cantelope

function u(t) {

x.globalAlpha=.08
半=500
x.fillRect(0,0,i=w=2e3,w)
for(i=500;i--;){
Math.random()>.9998?T=t-.19:T=t
x.clearRect(2*半+i*C(T),半+i*S(T),8,8)
}

Apr 1 2017 1:55 PM UTC

}// 137/140

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99 luftballons

u/magna

Will golf this a bit to open up some space for the possibility of making this in green.
u/magna

Still not enough: https://www.dwitter.net/d/2375
u/magna

The time warping is a genius idea BTW!
u/donbright

thanks good luck on green
u/donbright

update to future ppl: see @mxfh https://www.dwitter.net/d/2408

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magna

remix of d/2352 by u/sfz

function u(t) {

c.width=w=512
with(x)filter='sepia(1',fillRect(0,h=240,w,w),font='9em a',fillText('🚃',w-(t*w&1023),h+(t&4)),fillRect(Math.random()*w,0,1,w)

Apr 1 2017 2:09 AM UTC

}// 139/140

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u/cantelope

all aboard the steampunk trolly!
u/nonce

ahahaha
u/magna

Challenge: Add vignette, film grain and random scratches.
u/magna

#film

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sfz

function u(t) {

c.width|=h=540
D=new Date
for(i=h;i--;)I=S(t-i),O=C(t-i),o=!t?u[i]={x:D*i%h,y:D/i%h}:u[i],x.fillRect(2*h+2*o.x*O-o.y*I,h-o.y*O-o.x*I/3,7,4)

Mar 28 2017 7:48 AM UTC

}// 139/140

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Negative galaxy timelapse

u/sfz

if you want to get a laugh and ruin the magic, remove the -i from I and Our :}
u/sfz

*O
u/donbright

lol nice

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jick

function u(t) {

x.drawImage(c,C(t)*.2-2,S(t)*.2-2,1924,1084);
x.fillStyle=`hsl(${t*15},50%,50%)`
x.fillRect(940+S(t)*300,550+C(t)*290,20,20)

Mar 26 2017 2:02 AM UTC

}// 124/140

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u/donbright

great colors, really cool
u/Finianb1

This is such a trip