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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line-o

remix of d/9759 by u/line-o

function u(t) {

for(I=i=240;i--;){F=t*i;y=F/I;s=8*(y*y%1);_=F%I;z=C(F/s)*40;
x.fillStyle=R(z+200,z+100,200-z,.2);x.fillRect(_*s,y*s,s,s)}

Sep 11 2018 1:23 PM UTC

}// 121/140

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next1

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donbright

function u(t) {

c.width=2e3
for(i=0;i<t*t;i++){Φ=Math.acos(1-2*i/t/t)
Θ=10.1664*i
x.fillRect(
500*(2+C(Θ)*S(Φ)*S(t)+C(Φ)*C(t)),
500*(1+S(Θ)*S(Φ)),9,9)}

Sep 7 2018 4:57 AM UTC

}// 135/140

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Evenly spaced points on a sphere, based on CR Drost's phyllotaxis sunflower cylyndrical equal area map in python: https://stackoverflow.com/questions/9600801/…

u/joeytwiddle

Useful! #sphere
u/Odog8

Love me a PHI sphere in the morning!

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prplz

remix of d/9514 by u/prplz

function u(t) {

x.setTransform(1,0,0,1,960,540)
x.strokeStyle=`hsl(${t*99},50%,50%)`
x.rotate(t)
q=t%9*99
x.strokeRect(-q,-q,q*2,q*2)

Sep 9 2018 1:32 AM UTC

}// 117/140

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u/DataMeta

Ooh, very nice!
u/DataMeta

#waitforit

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ArtyomShegeda

function u(t) {

c.width=2e3;for(i=0;i++<377;x.arc(a,b,r,0,6.3))x.moveTo((a=800+C(t+i/15)*400)+(r=50+S(t+i/5)*30),b=600+S(t+i/60)*300);x.stroke()

Sep 10 2018 10:12 PM UTC

}// 128/140

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Pulsing Lissajous curve animated

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f8f82804

remix of d/9740 by u/f8f82804

function u(t) {

with(x)c.width^=r=_=>rotate(4),x.l=translate,l(960,9),f=d=>d--&&save(fillText(d,0,99*S(t%1*2)))&r(l(0,99))&r(f(d))&restore(f(d));f(t%11+1|0)

Sep 10 2018 8:29 PM UTC

}// 140/140

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Tiny tweak, using the fact that x.l=translate,l(...),l(...) saves two characters. This is the equivalent of x[l='translate'](...),x[l](...) if you're already using with(x).

u/f8f82804

#golf

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cantelope

function u(t) {

eval(unescape(escape`景爨砮晩汬却祬攽怣㄰㌸怬砮晩汬剥捴⠰ⰰⱷ㴲攳ⱷ⤬椽㈰〬砮景湴㴧㜵灸⁡✻椭ⴻ砮晩汬呥硴⡓瑲楮朮晲潭䍯摥偯楮琨ㄲ㠱㔱⭩┹⤬⡶┱㜭ㄫ匨瀽⸳㔪瘩⨱⸵⤪ㄲ㠬⡶⼱㝼〩⨱㈸ⴲ㘴⭓⡰⤪ㄱ〩⥶㵩⭴⨸┱㠻`.replace(/u(..)/g,"$1%")))

Sep 8 2018 1:06 AM UTC

}// 140/140

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u/innovati

❤️🧡💛💚💙💜🖤❣️💕💞💓💗💖💘💝
u/iverjo

#hearts
u/donbright

wo;d
u/donbright

wild

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snail_

remix of d/2186 by u/snail_

function u(t) {

i=a=>Math.random()*a
x.fillStyle=R(i(256),i(256),i(256),.5)
x.beginPath()
x.arc(i(1920),i(1080),i(100)+50,0,Math.PI*2)
x.fill()

Sep 10 2018 6:04 AM UTC

}// 127/140

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just golfed

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joeytwiddle

remix of d/9780 by u/prplz

function u(t) {

c.width=-1;for(x.scale(X=15,15);X--;)for(Y=15;Y--;x.fill())for(x.beginPath(i=6);i--;)x.lineTo(C(a=(i*4.2+.5+t+C(t))/4)+X*2+Y%2,S(a)+Y*1.7)

Sep 12 2018 5:25 AM UTC

}// 138/140

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Hexagons, slowly spinning clockwise

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katkip

remix of d/9704 by u/katkip

function u(t) {

a=.2*9,b=9;c.width^=0;x.translate(960,540);for(τ=0;τ<2e3;τ++)x.rotate(t/1000),x.fillRect(S(τ*a)*1400,C(τ*b)*200,C(τ)*30,C(τ)*30)

Sep 9 2018 7:41 AM UTC

}// 128/140

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Orbits?

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prplz

remix of d/9771 by u/BalintCsala

function u(t) {

c.width=-1
for(x.scale(X=q=15,q);X--;)for(Y=q;Y--;x.fill())for(x.beginPath(i=6);i--;)x.lineTo(C(a=i*1.04+S(t)*1.57+1.57)+X*2+Y%2,S(a)+Y*1.7)

Sep 12 2018 2:24 AM UTC

}// 140/140

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for(x.scale(X=15,X);X--;)for(Y=15;