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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.

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

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LimeLaser

function u(t) {

X=o=>960+500*C(t+o)
Y=o=>540+500*S(t+o)
x.beginPath()
x.moveTo(X(1),Y(2))
x.bezierCurveTo(X(4),Y(8),X(16),Y(32),X(64),Y(128))
x.stroke()

Sep 1 2019 8:31 AM UTC

}// 136/140

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Curved Geometry Drawer

u/LimeLaser

This uses the bezierCurveTo method with different values to see what shapes it can draw.
u/marmph

slap a few sines and cosines together and BAM ART

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KilledByAPixel

remix of d/15572 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡣⹷楤瑨簽〬晩汬剥捴⠰ⰰⰲ攳ⰲ攳⤬杬潢慬䍯浰潳楴敏灥牡瑩潮㴧獣牥敮✬景湴㴧㤰敭∧Ⱪ㴳㭩ⴭ㭦楬汔數琨❃䡒位䅔䥃✬㐹⭩⨹ⰱ〲〬ㄸㄵ⤩晩汬却祬攽恨獬⠤筩⨱㈰⭴⨱㥽‹㤥㔰╠`.replace(/u(..)/g,"$1%")))

Aug 29 2019 9:56 PM UTC

}// 135/140

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Chromatic aberration v2

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LimeLaser

function u(t) {

x.beginPath(s=8e3,d=5)
p=[[C(t),0,d+t**.8],[0,S(t),d+t**.8]]
p.map(v=>x.lineTo(960+s*v[0]/v[2],540-s*v[1]/v[2]))
x.stroke()

Aug 29 2019 4:31 AM UTC

}// 123/140

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Grid Spiral

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mildlybean

function u(t) {

for(c.width+=j=0;10>j;j+=2.094)for(i=30;i--;)x.moveTo(n=960+S(t+j)*(g=S(t)*600),m=540+C(t+j)*g),x.arc(n,m,18*i,0,7);x.lineWidth=9;x.stroke()

Aug 23 2019 12:49 AM UTC

}// 140/140

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I spent hours on this one #moire

u/katkip

interesting

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rodrigo.siqueira

function u(t) {

η=.1
ℵ=1/t
for(X=-3;X<3;X+=.01){
y=X**3-X*2
ℵ=ℵ-η*(ℵ**3-2*ℵ)
x.fillRect(940+X*400,-y*100+500,5,5)
}
x.fillRect(910+ℵ*400,470,60,60)
throw(ℵ)

Aug 21 2019 1:45 PM UTC

}// 140/140

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Gradient Descent (iterative) algorithm used to calculate sqrt(2). The big dots are the two roots -sqrt(2) and +sqrt(2) of equation Y=X**3-X*2. The Gradient Descent is an optimization algorithm for finding a local minimum of a function near a starting point, taking successive steps in the direction of the negative of the gradient. x[n+1]=x[n]−η(∇f)xn where η is the "Learning Rate". Gradient Descent is widely used for training Machine Learning models. #neural #ai

u/rodrigo.siqueira

Simple version that calculates sqrt(2). If you change initial "x" to -1, it will converge to -sqrt(2), that is the other root of the equation Y=X**3-X*2. Code: x = 1; learning_rate = .1; for(i=0;i<50;i++) { x = x - learning_rate * (x**3 - 2*x) } throw(x);

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Benjiji

function u(t) {

c.width^=0
N=999*S(t/10)
for(i=0;i<N;)Z=2*i/N-1,Y=S(i*0.2)*Z*0.3,X=C(i++*0.2)*Z+Y*C(0.7),Y=Z+Y*S(0.7),x.fillRect(X*300+960,-Y*300+540,15,5)

Aug 19 2019 9:18 PM UTC

}// 139/140

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#hourglass #runningtime

Show more comments…
u/Benjiji

Did not find a way to get it to start over more quickly in 140...
u/13thptr

Multiplying by 0.2 is equivalent to dividing by 5 (gain 2 bytes each time) and cos(0.7rad) is roughly 0.76 which can be written .76
u/13thptr

also moving c.width^=0 to the first part of the for loop saves 2 bytes
u/13thptr

123 : N=999*S(t/10) for(c.width^=i=0;i<N;)Z=2*i/N-1,Y=S(i/5)*Z*.3,X=C(i++/5)*Z+Y*.76,Y=Z+Y*.64,x.fillRect(X*300+960,-Y*300+540,15,5)
u/13thptr

*126: N=999*S(t/10);for(c.width^=i=0;i<N;)Z=2*i/N-1,Y=S(i/5)*Z*.3,X=C(i++/5)*Z+Y*.76,Y=Z+Y*.64,x.fillRect(X*300+960,-Y*300+540,15,5)
u/Benjiji

Nice, thx!
u/atgz

you can also use .7 instead of 0.7, might come in handy next time

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TheYoungBard

remix of d/739 by u/donbright

function u(t) {

c.width=900;for(i=0;i<250;i++){x.fillRect(450+C(i*t/18)*i,250+S(i*t/18)*i,4,4)}

Aug 14 2019 1:08 PM UTC

}// 79/140

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Psychadelic Effect

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TheYoungBard

function u(t) {

c.width=1920
for(i=0;i<96;i++)
x.fillRect(850+S(t-i*3.14/16)*300,600+C(t-i*3.14/12)*300,9,9)

Aug 14 2019 12:21 PM UTC

}// 92/140

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Pretzel (Lissajous Curve)

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taupelink

remix of d/14962 by u/katkip

function u(t) {

c.width*=1;for(j=45;j--;){for(i=3;i--;)x.fillStyle=['navy','#900'][j%2],x.beginPath(),x.arc(i*960,1540,30*j,t*2+4+j,t*2+4.5+j),x.fill();}

Aug 11 2019 12:14 AM UTC

}// 137/140

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Adding a second color to https://www.dwitter.net/d/14962 , but mostly I want to draw attention to the original. Please go to the original and click Awesome!

u/katkip

Thx

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tomxor

remix of d/15357 by u/tomxor

function u(t) {

eval(unescape(escape`景爨愽戽〬椽ㅥ㐻椭ⴻ砮晩汬却祬攽恈卌⠤筡⨳㘰紬㤹┬㌳┩怬砮晩汬剥捴⠹㘰⬳㈰⩓⡡⨳⤪匨截㐩ⰵ㐰⬳㈰⩃⡡⨳⤬ㄬ⸰㔩⥲㴰簴⩍慴栮牡湤潭⠩ⱡ⬽⸴⨨爭愫截匨愪㌩⤬戫㴮㐪⠰ⵡ⩢⭃⡡⨳⤩`.replace(/u(..)/g,"$1%")))

Aug 9 2019 9:02 PM UTC

}// 134/140

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Colour Marbles

u/danny@hille.dk

#underrated