Dwitter - javascript demos in 140 characters

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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BOOSH

remix of d/15514 by u/pavel

function u(t) {

with(x)for(c.width|=i=2,translate(960,540);i--;fillRect(-2e3,-2,4e3,4))rotate(q=Math.PI/22),beginPath(fill(arc(S(t+i*q)*500,0,50,0,2)))

Aug 25 2019 12:08 PM UTC

}// 135/140

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u/katkip

fail

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16mm

function u(t) {

w=1920
z='translate'
l='lineTo'
d=960
e=d*.6
o=132
x.moveTo(d,e)
x[l](d-o,w)
x[l](d+o,w)
x.fill()
x[z](d,e)
x.rotate(Math.PI/10)
x[z](-d,-e)

Aug 23 2019 9:29 PM UTC

}// 140/140

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siemens star

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django

function u(t) {

w=c.width*=1
x.translate(w/2,540)
for(i=0;i<50;i++)for(j=0;j<50;j++)z=t+j+i,x.rotate(j-i+t/1e4),x.fillRect(S(z/2)*2+i*2,C(z/2)*450,5,5)

Aug 22 2019 7:29 AM UTC

}// 136/140

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Orbit

u/aleamb

cool!

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taupelink

function u(t) {

eval(unescape(escape`景爨椽搽攽昽朽㉥㌻椭ⴻ砮晩汬剥捴⡤⩺ⱥ⩺ⰱⰱ⤩孤ⱥⱦⱧ崽嬨爽䵡瑨⹲慮摯洨稽ㄷ⤪㌶ぼ〩⼳⭧⩃⡥⼹⭧⭲⤯昬爥ㄶ⨴⭦⩓⡥⼷⤯本爥⸹⭦⼲ⰱ⵲┮㤫术㉝ⱸ⹦楬汓瑹汥㵠桳氨⑻牽ⰹ〥ⰳ〥⥠`.replace(/u(..)/g,"$1%")))

Aug 23 2019 4:20 AM UTC

}// 134/140

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Compression by d/9207

u/taupelink

Testing asdf`
u/taupelink

for(i=d=e=f=g=2e3;i--;x.fillRect(d*z,e*z,1,1))[d,e,f,g]=[(r=Math.random(z=17)*360|0)/3+g*C(e/9+g+r)/f,r%16*4+f*S(e/7)/g,r%.9+f/2,1-r%.9+g/2],x.fillStyle=`hsl(${r},90%,30%)`

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taupelink

remix of d/15504 by u/taupelink

function u(t) {

for(i=d=e=f=g=1e3;i--;x.fillRect(z+d*z,495-e*z,1,1))[d,e,f,g]=[(r=Math.random(z=400)*8|0)/2+C(d+r)/f,f-r%3+g*T(d^r)/f,r%5/3+f/4,(r&4)/9+g/6]

Aug 23 2019 4:16 PM UTC

}// 140/140

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d/15505

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taupelink

remix of d/15512 by u/taupelink

function u(t) {

for(i=d=e=f=1e3;i--;x.fillRect(d*z|0,e*z|0,1+r%2,1+i%2))[d,e,f]=[(r=Math.random(z=99)*z|0)/5+(p=1+f)*C((q=d*3)+r/2),r%11+T(q)/p,i%7/5+1/p]

Aug 24 2019 2:40 PM UTC

}// 138/140

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metamero

remix of d/15479 by u/metamero

function u(t) {

throw T=~~T+1

Aug 21 2019 1:56 PM UTC

}// 13/140

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13B variable reuse init demo

u/taupelink

nice!
u/KilledByAPixel

tight, i was looking for something like this

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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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katkip

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀪🐱𞱩𩠨𘑴𚑻𬰽𦱝𞱦𫱲𚁩🐱𩐳𞱩𛐭𞰩𬰮𬁵𬱨𚁻𨐺𪐬𨠺𜐰𜁽𚑽𞱦𫱲𚁯𘁯𩠠𬰩𮀮𩡩𫁬𤡥𨱴𚀹𝠰𚱓𚁯𛡡𚐪𫰮𨠬𝐴𜀫𠰨𫰮𨐩𚡯𛡢𛁯𛡢𛰱𜀬𫰮𨠯𜐰𚐬𫰮𨐫👃𚁯𛡡𙠱𚐯𞐹𛁯𛡢𚰽𠰨𫰮𨐪𜰩`.replace(/uD./g,'')))

Aug 22 2019 5:54 PM UTC

}// 121/140

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3D chaos flower that grows symmetrically! isn't #chaos #cute ? #waitforit c.width*=1;if(!t){s=[];for(i=1e3;i--;)s.push({a:i,b:100})};for(o of s)x.fillRect(960+S(o.a)*o.b,540+C(o.a)*o.b,o.b/10,o.b/10),o.a+=C(o.a&1)/99,o.b+=C(o.a*3)

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username

remix of d/15452 by u/username

function u(t) {

t=t*t
eval(unescape(escape`朽挮睩摴桞㴰㭦潲⡪㴴㭪ⴭ㬩景爨椽朻ⴭ椻砮晩汬剥捴⡩ⰵ㐰⵷⼲⭓⡩⼴㌩⨹⬨焽㤶〭椩⼲⨨焾㸳ㄩ⨪椬㈬眩⥷㴮㐪⨨椯㤹⴨琫権⨶┲㜫㔩⨪㈪ㄶㄫ㤬砮晩汬却祬攽恨獬⠤筩⼶紬㘸┬㔰╠`.replace(/u(..)/g,"$1%")))

Aug 22 2019 5:44 PM UTC

}// 136/140

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watch this become beautiful