Dweets awesomed by u/nic

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: #ScaryMovies

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gabeu

function u(t) {

w=c.width=2e3;for(i=0;i<99*S(t)*S(t);i++){x.arc(1e3+143*C(i*0.0635),5e2+143*S(i*0.0635),Math.abs(w*S(i*0.03+t))/7,0,6);x.stroke()}

Dec 30 2017 5:38 PM UTC

}// 130/140

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DwittererInChief

function u(t) {

c.width=r=j=2e3;for(;j--;){if(j*t%1>t/9)x.fillRect(0,j,r,5);x.font='4em a';x.fillText((21+[7,-7,2,-8,2,9,-8,-7][j%8]).toString(36),j*69,99)}

Dec 30 2017 5:33 PM UTC

}// 140/140

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Simonster

remix of d/4845 by u/Simonster

function u(t) {

z=300
c.width=z*4
j=t/z/3
x.translate(z*2,z+40)
x.rotate(t*2)
for(i=z*3;i--;)a=T(j*i)*z,x.fillStyle=R(z,0,z),x.fillRect(S(i)*a,C(i)*a,5,5)

Dec 30 2017 5:29 PM UTC

}// 138/140

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Xen

function u(t) {

x.globalCompositeOperation='xor',Y=c.width=99;for(i=2e4;i--;)x.fillRect(i%Y,i/Y,X=S(i-C(t)*Y)-1,X*S(X*t))

Dec 30 2017 4:36 PM UTC

}// 105/140

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u/nic

Damn, lemme adjust the antenna... :)

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xem

function u(t) {

r=z=>Math.random()*255
y=z=>R(r(),r(),r(),r()/99)
if(t-~~t<.15)c.style=`transition:1s;background:${y()}radial-gradient(${[y(),y(),y(),y()]}`

Dec 30 2017 3:40 PM UTC

}// 140/140

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u/farter

t%1

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joeytwiddle

remix of d/4805 by u/Jezza

function u(t) {

c.width=640;d=-2.1;e=1.9;for(i=l=j=t;i<6e4;i++)k=S(d*l)+C(t)*C(j*d),m=S(e*j)+S(t)*C(l*e),j=k,l=m,x.fillRect(320+j*100,180+l*70,.3,.3)

Dec 30 2017 3:29 PM UTC

}// 133/140

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u/xem

Splendid
u/joeytwiddle

I do like adding alpha to other people's attractors http://bit.ly/2pZCrOg http://bit.ly/2DDaPjO
u/joeytwiddle

This version is easier to resize: https://www.dwitter.net/d/5336
u/joeytwiddle

Please do give Jezza an upvote. They did most of the work here!
u/katkip

#attractor

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joeytwiddle

remix of d/4827 by u/New_Core

function u(t) {

for(c.width=99,i=9;i--;x.fillRect(40+35*S(t-i),19-14*C(t*i),20,20))x.filter='blur(5px)contrast(1%)',x.globalCompositeOperation="lighter"

Dec 30 2017 1:49 PM UTC

}// 136/140

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Shaded metaballs

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u/joeytwiddle

I was actually trying to threshold but ended up with something unexpected
u/joeytwiddle

Can anyone explain it ... ? lol
u/sigveseb

Sweet metaballs
u/joeytwiddle

blur(0px) helps to show what's going on.
u/joeytwiddle

Something similar but more beautiful: https://www.dwitter.net/d/5321
u/joeytwiddle

Another funny wobbly thing: d/5446
u/joeytwiddle

This is what I had been trying to reproduce: https://codepen.io/aswhipple/pen/xpywbO
u/joeytwiddle

Programmatic metaballs by sop: d/7488
u/iverjo

#metaballs
u/katkip

#cells
u/joeytwiddle

NewCore has done this technique right: d/17584
u/rodrigo.siqueira

#cell

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New_Core

remix of d/3510 by u/New_Core

function u(t) {

for(a=c.width|=i=9;i--;x.fillRect(740+650*S(t*.9+i*4),350+280*C(t+i),400,400))x.filter='blur(100px)',x.globalCompositeOperation="lighter"

Dec 30 2017 10:16 AM UTC

}// 138/140

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u/joeytwiddle

This is very heavy on my laptop! Remixed here: #4841
u/joeytwiddle

Very nice though. It plays tricks on my eyes, seems to be always growing.
u/New_Core

Sometimes dwitts gets heavy here also scrolling down the list.. most times it help to copy the share link and look at it alone, but yea this one can be heavy, running lots of filters and "gCO"'s
u/13thptr

#heavy #metaballs -like effect

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indjev99

remix of d/4804 by u/indjev99

function u(t) {

D=b=>45*S((i*i+b*b)**.5-3*t);for(i=96;i--;)for(j=54;j--;)d=D(-j)+D(27-j)+D(54-j)+128,x.fillStyle=R(d,d,d),x.fillRect(i*20,j*20,20,20)

Dec 30 2017 9:38 AM UTC

}// 133/140

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Jezza

function u(t) {

c.width=1920;d=-2.1;e=1.9;for(i=l=j=t;i<9e3;i++)k=S(d*l)+C(t)*C(j*d),m=S(e*j)+S(t)*C(l*e),j=k,l=m,x.fillRect(960+j*400,540+l*250,2,2)

Dec 30 2017 5:02 AM UTC

}// 133/140

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Newbie here. Would have loved to add some alpha but no room :)

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u/Jezza

Heavily inspired by: http://paulbourke.net/fractals/clifford/
u/sigveseb

A trick for alpha is to fillrect with a width < 1 ;)
u/joeytwiddle

You can save 3 chars with: c.width|=e=1.9 (doesn't seem for work for negative d)
u/joeytwiddle

I did you a low-res remix: https://www.dwitter.net/d/4842
u/Jezza

Thanks for the tips and this remix!
u/joeytwiddle

jonathan_b has also done a remix: d/5348

dwitter.net | nic (3731)