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.

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

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tomxor

function u(t) {

c.width=w=96
for(i=5e3;X=i%w,Y=i/w,i--;x.fillRect(X+2*Z,Y+4*Z,.6,1))Z=(.5+S(i/15+t*2)/2)*S(S(Y/8+t)+S(X/24+t)+t),Z=C(2*Z+S((X&Y)/(1+Z*Z))/8)

Mar 2 2019 7:46 PM UTC

}// 140/140

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Fractal Lake

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Xen

remix of d/12619 by u/Nexrem

function u(t) {

z=950;for(c.width|=i=2e3;i--;x.lineTo(z+C(i-1)*z,540+S(t+i/3)*540))x.moveTo(z+C(i)*z,540+S(t-i/.6)*540);x.stroke()

Mar 5 2019 1:24 PM UTC

}// 114/140

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u/Nexrem

Nice, I tried something similar but didnt have enough chaes to scale the timing down for a smooth animation

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Porpr

function u(t) {

c.width^=0;l=0;k=t;f=S(t);a=300+f*99;for(i=0;i<300;i++){k+=4.71+(f*S(t*0.1)*0.005);l+=i%5;a-=f;x.lineTo(660+C(k)*l+a,600+S(k)*l)}x.stroke()

Mar 6 2019 12:43 AM UTC

}// 139/140

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Rotamid

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f8f82804

remix of d/12658 by u/qm3ster

function u(t) {

for(r=Math.random,i=1e4;i--;x.fillRect(p[0]+=2-4*r(),p[1]+=2-4*r(),2,2))p=u[z=i%2e3]=u[z]||[a=z,b=r()*1080,R(a/8,b/4)],x.fillStyle=p[2]

Mar 7 2019 12:16 AM UTC

}// 135/140

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A little golf and a color tweak to get some room to play with performance. it seems like the limit is just in drawing; Math.random() seemingly can't be improved on. I'd like to look at putImageData as suggested by https://stackoverflow.com/a/4901604 because it's possible that color parsing is a big overhead cost.

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qm3ster

remix of d/12641 by u/qm3ster

function u(t) {

t||(x.strokeStyle='#FF0')
x.filter=`hue-rotate(${t/=3}rad)`
r=540
x.beginPath()
while(r>0)x.lineTo(--r*S(t-=.01)+960,r*C(t)+540)
x.stroke()

Mar 5 2019 10:54 PM UTC

}// 139/140

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Debian. JK, it's a candy.

u/13thptr

Nice colors :o

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Nexrem

function u(t) {

c.width^=0;e=Math.floor;z=950;for(i=0;i<2000;i++){x.moveTo(z+C(i)*z,540+S(i*e(t))*540);x.lineTo(z+C(i+1)*z,540+S((i+1)*e(t))*540)}x.stroke()

Mar 5 2019 12:17 AM UTC

}// 140/140

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u/lionleaf

Nice one! Welcome to Dwitter :)
u/rodrigo.siqueira

Same result with just 77 characters, using ~~ instead of Math.floor; No need to x.moveTo; c.width can be together with other elements to avoid "0" in "^=0" and other shortcuts: for(c.width^=i=0;i<2e3;i++)x.lineTo(950+C(i)*950,540+S(i*~~t)*540);x.stroke()
u/Xen

Love it

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f8f82804

remix of d/12681 by u/f8f82804

function u(t) {

eval(unescape(escape`景爨椽ㅥ㐻椭ⴻ砮灵瑉浡来䑡瑡⠮⸮畛稽椥㉥㍝㴨畛穝籼孮敷⁉浡来䑡瑡⡕楮琸䍬慭灥摁牲慹⹯昨稯㠬〬戽爨⤪㈵㔬㈵㔩ⰱ⤬稬截㑝⤮浡瀨⡶ⱪ⤽㹪㽶⬲ⴴ⩲⠩㩶⤩⥲㵍慴栮牡湤潭`.replace(/u(..)/g,"$1%")))

Mar 7 2019 6:52 PM UTC

}// 127/140

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I see a 3x speedup using putImageData over fillRect

u/f8f82804

for(i=1e4;i--;x.putImageData(...u[z=i%2e3]=(u[z]||[new ImageData(Uint8ClampedArray.of(z/8,0,b=r()*255,255),1),z,b*4]).map((v,j)=>j?v+2-4*r():v)))r=Math.random

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rodrigo.siqueira

remix of d/12645 by u/rodrigo.siqueira

function u(t) {

t||(X=Y=Z=1)
for(i=4e3;i--;)x.fillStyle=`hsl(${Z*3.5},50%,45%,50%)`,X+=(Y-X)/4.5,Y+=X-X*Z/80,Z+=(X*Y-Z)/17,x.fillRect(960+Y*30,Z*10-200,1,1)

Mar 6 2019 4:02 PM UTC

}// 140/140

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Lorenz symmetry #attractor #lorenz

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andrea270872

function u(t) {

K=55
T=t*60*K
I=T%2e3
J=(T/2e3*K)%1e3
A=I/1e3-1,B=J/600-1
for(i=0;i<15;i++)[A,B]=[A*A-B*B-.8,2*A*B+.2]
if((A*A+B*B)<99)x.fillRect(I,J,K,K)

Mar 7 2019 12:47 PM UTC

}// 138/140

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Ghost of Julia

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qm3ster

remix of d/12626 by u/qm3ster

function u(t) {

for(r=Math.random,w=i=2e3;i--;x.fillRect(p[0]+=2-4*r(),p[1]+=2-4*r(),2,2))p=u[z=i%500]=u[z]||[a=w*r(),b=w*r(),R(0,a/8,b/4)],x.fillStyle=p[2]

Mar 6 2019 11:08 AM UTC

}// 140/140

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Multiple steps per particle per frame, fit thanks to u/pavel's golf