Dweets awesomed by u/andrea270872

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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katkip

function u(t) {

c.style.background="#205";x.beginPath(x.strokeStyle='#fff1');for(i=9;i--;)x.lineTo(960+C(-(q=i*i*t)%3+5)*360,540+S(-q%3+5)*360);x.stroke()

Jun 20 2019 2:19 PM UTC

}// 138/140

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#moon #realistic A realistic moon with patterns on it.

u/Xen

love it!
u/KilledByAPixel

That's no moon...
u/katkip

It's a space station then

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loktar

function u(t) {

eval(unescape(escape`𩡯𬠨𮐽𘑴𙠦𦰰𧑼𯁹𛁷🐲𩐳𛁨🐱𜀸𜀬𪐽𜐬𮀮𩁲𨑷𢑭𨑧𩐨𨰬𜀬𜀬𭰬𪀬𜀬𛐱𛁷𛁨𚐻𪐼𭰻𚑹𦱩𧐽𭀦𙠨𮑛𪑝𚰹𚡍𨑴𪀮𬡡𫡤𫱭𚀩𚱹𦱩𛐱𧐩𛰭𜡼𯀭𮑛𪐭𜑝𛁌🐲𜀪𮑛𪑝𛁸𛡦𪑬𫁓𭁹𫁥👠𬡧𨠨𜀬𙁻𣁽𛀤𮱌𯐩𨀬𮀮𩡩𫁬𤡥𨱴𚁩𛁨𛀱𛀭𮑛𪑝𚐬𪐫𚰻`.replace(/uD./g,'')))

Jun 19 2019 11:09 PM UTC

}// 138/140

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Just a random scroller original vs is from 2013, https://codepen.io/loktar00/details/BCEvp

u/KilledByAPixel

good texture
u/Xen

very nice!
u/katkip

looks like #waves
u/magna

#texture

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veubeke

function u(t) {

c.width^=0
for(X=80;X--;)for(Y=45;Y--;x.fillRect(X*24,Y*24,$/5,$/5))$=Math.hypot(X-40-S(t)*16,Y-22)*6,x.fillStyle=`hsl(${$*80},90%,50%)`

Jun 19 2019 11:35 AM UTC

}// 136/140

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pavel

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪁼👦👧🐾𚁫𙐱𝠦𙠱𚱫𙐲𚠮𝀱𝀩𚡧𚁡🐮𝰸𝐴𚠨𪰫𜠯𚀱𚰱𩐳𚠪𚁴𙐱𚠴𛑩𚐩𚐩𛁫🐵𝰻𪐽𛐭𪰾🠴𞱸𛡦𪑬𫁒𩑣𭀨𞐶𜀫𝰰𜀪𦀯𮠭𬰬𝐴𜀫𝰰𜀪𦐯𮠭𬰬𬰪🐲𛁳𚐩𦱘𛁙𛁚𧐽𦱘👦𚁃𚐬𪐭𜠬𩠨𤰩𛁘𛁩𛐲𧐮𬱬𪑣𩐨𭀥𜰩𛁺🐳𚱚𛁳🐹𞐯𮠯𮠻`.replace(/u../g,'')))

Jun 19 2019 3:43 AM UTC

}// 139/140

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Rubik's Cube Movement

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u/pavel

191 for(c.width|=f=g=>(k%16&&1+k%2*.414)*g(a=.7854*(k+2/(1+1e3**(t%1*4-i)))),k=57;i=--k>>4;x.fillRect(960+700*X/z-s,540+700*Y/z-s,s*=2,s))[X,Y,Z]=[X=f(C),i-2,f(S),X,i-2].slice(t%3),z=3+Z,s=99/z/z
u/katkip

too good.
u/username

Rubik's Cubes cannot move the middle layer
u/pavel

If you hold the sides the middle moves, no? How could it not!
u/pavel

Here are notation-only moves for(c.width|=f=g=>(k%16&&1+k%2*.414)*g(a=.7854*(k+y*2/(1+1e3**(t%1*4-i)))),k=57;i=--k>>4;x.fillRect(960+700*X/z-s,540+700*Y/z-s,s*=2,s))[X,Y,Z]=[y=i-2,X=f(C),f(S),y,X].slice(t%3),z=3+Z,s=99/z/z
u/username

Technically you are moving both sides at the same time in that case instead of moving the middle layer.
u/katkip

^
u/pavel

That's not what technically means. You have a mental model that only permits sides to move, and you have that model because adding middle rotations would be notationally redundant in that model. This does not mean middle rotations are somehow impossible or that they definitely consists of two side rotations.
u/username

Erm, the middle layer is attached to the core, that is what I mean. It is about the construction of a Rubik's Cube.
u/username

http://www.madehow.com/images/hpm_0000_0007_…
u/pavel

Still seems like this is a matter of perspective. You are chosing a perspective in which the core is always fixed, even though the motion I am describing specifically involves holding the two sides fixed and rotating the core... In my reference frame the core is rotating. So what if the core contains more parts than the side pieces when you take the cube apart?
u/13thptr

that escalated quickly
u/donbright

maybe they dont actually move like this... but they should!

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taupelink

function u(t) {

f=j=>x.fillRect(448+(j&255)*4,(j>>8)*4,4,4)
t||(p=Array(N=4**8).fill(n=1),f(0),f(1))
if(p[++n])for(i=1;(q=++i*n)<N;)p[q]=0,f(q),M=n;throw M

Jun 19 2019 2:39 AM UTC

}// 139/140

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Sieve of Eratosthenes. Throws primes less than 65536. Row Y Column X stays unfilled if 256*Y+X is prime. #math

u/Xen

clever
u/donbright

#primes #numbertheory
u/taupelink

maybe #sieve is a worthwhile hashtag too!

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Xen

remix of d/14525 by u/rodrigo.siqueira

function u(t) {

for(I=1e3;I;x.fillRect(I--,t*199,X>1,3))for(W=X=I/250-3,Z=Y=t-1.5,T=9;T--;Y=2*U*Y+Z)U=X,X=X*X-Y*Y+W

Jun 17 2019 6:28 PM UTC

}// 99/140

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99byte dwitter #mandelbrot #fractal

u/13thptr

!
u/Xen

massive shoutz to rodrigo, nice clean code, couldn't of golfed this without him!
u/katkip

97 for(I=1e3;I;x.fillRect(I--,t*199,X>1,3))for(W=X=I/250-3,Z=Y=t-2,T=9;T--;Y=2*U*Y+Z)U=X,X=X*X-Y*Y+W

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katkip

remix of d/14599 by u/katkip

function u(t) {

t||(q=-4)
for(i=108;i--;)q+=(i-54)%frame/99,x.fillStyle=R(q*128,q*9,18+S(q*q/9)*250),x.fillRect(10+frame*10,10*i,10,10)

Jun 14 2019 7:06 PM UTC

}// 119/140

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henrosaurus

function u(t) {

c.width|=f=S(t)* S(t);p=600
for(i=0;i<60;i++)
x.arc(f+p, f+p, Math.abs(S(t)*350), S(t)+i, S(t)*0.1*i+f)
x.lineWidth=9
x.stroke()

Jun 14 2019 5:33 PM UTC

}// 129/140

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jsut some rubber ball rollin'

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rodrigo.siqueira

remix of d/14525 by u/rodrigo.siqueira

function u(t) {

for(var I=960;I--;)for(var U=P=X=I/190-3,Q=Y=t/3-1.85,k=14;k--;)U=X,X=X*X-Y*Y+P,Y=2*U*Y+Q,X*X>2?x.fillRect(I*2,t*99,2,2):x.fillStyle=R(k**2)

Jun 14 2019 2:56 PM UTC

}// 140/140

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Red rays from the Mandelbrot Set #mandelbrot #fractal

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u/KilledByAPixel

Amazing.
u/artfarnaa

Is there a way to make these fractal examples render faster? Perhaps offload the calculations to web assembly?
u/username

"Red rays" also known as low iteration count
u/13thptr

u/artfarnaa wasm isn't much faster than js on most platforms and it takes a lot of space to set up
u/13thptr

see u/rbong's work on it
u/katkip

i don't understand this so awesome
u/rodrigo.siqueira

Artfarnaa, it is possible to make super fast, see this pure JS fast implementation: https://csl.name/mandelbrot/ There are many tricks specifically created to calculate Mandelbrot Set (e.g. avoid calculations in a rectangle inside the main set because all pixels are white and calculations in this white area is slower than other parts), but no speed optimization were used here because of space constraints. Some tricks to make it faster: do not use time variable to do calculations (because it is max 60 fps), do not plot each pixel, but store them in an array and plot at once using c.putImageData(img)...
u/KilledByAPixel

There is one way to make it very very fast. I just made a quick shader of it for you! https://www.shadertoy.com/view/wtjGz3
u/artfarnaa

Thanks guys, great inspiration.

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joeytwiddle

remix of d/9674 by u/f8f82804

function u(t) {

with(x)for(i=c.width^=0;beginPath(),i--;fill())arc(960+(i*960-i*i)**.5*S(a=t-i),48+i,9*(C(a)*S(i/306))**.3,0,7)

Jun 14 2019 2:15 PM UTC

}// 111/140

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Just a little remix

u/katkip

#d3
u/joeytwiddle

No perspective, but proper flattening: with(x)for(i=c.width^=0;i--;fill())beginPath(),C(a=t-i)>0&&ellipse(960+(i*960-i*i)**.5*S(a),48+i,15*C(a),15*S(i/306),0,0,7)
u/joeytwiddle

Spirals: with(x)for(i=c.width^=0;i--;fill())beginPath(),C(a=(t|0)*i-C(t))>0&&ellipse(960+(i*960-i*i)**.5*S(a),48+i,15*C(a),15*S(i/306),0,0,7)

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