New #rainbow dweets

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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Xen

function u(t) {

x.translate(1920,0)
x.scale(-1,1)
x.fillRect(1e3+C(t)*599,500+S(t^1)*499,t,9)
x.drawImage(c,S(t),C(t*.3))
x.fillStyle=`hsl(${t*99},50%,50%)`

Apr 25 2019 10:12 PM UTC

}// 140/140

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inkblot

u/Xen

#inkblot #rainbow #trippy

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katkip

remix of d/13374 by u/katkip

function u(t) {

r=Math.random;for(i=999;i--;)p=r()*7,R=r()*p*99,x.fillStyle=`hsl(${p*p*R/9} 99%${R/9}%)`,x.fillRect(960+(X=C(p)*R),540+(Y=S(p)*R),9,9)

Apr 22 2019 11:41 AM UTC

}// 134/140

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Fibonacci rainbow #random #color #rainbow

u/katkip

Also shows protons flying near a black hole

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katkip

function u(t) {

r=Math.random;for(i=999;i--;)p=r()*7,R=r()*600,x.fillStyle=`hsl(${p*360/3.14/2} 99%${R/5}%)`,x.fillRect(960+(X=C(p)*R),540+(Y=S(p)*R),9,9)

Apr 22 2019 11:39 AM UTC

}// 138/140

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Hue wheel

u/katkip

#color #random #rainbow

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Xen

remix of d/13337 by u/vinca

function u(t) {

for(i=1e3;i--;x.fillRect(i*2,0,3,9))x.fillStyle=`hsl(${1e3*S(t+i/4+C(2*t/9)/9)+i+t*1e3},80%,80%,.1`;x.drawImage(c,0,9)

Apr 21 2019 8:39 PM UTC

}// 118/140

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Enjoy the trip

u/Xen

#trippy #rainbow

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f8f82804

remix of d/12142 by u/f8f82804

function u(t) {

with(x)t||fillRect(t,t,a=5e3,a),setTransform(9,0,0,9,960,540),rotate(w=t&&w<a?w+2.4:1),fillStyle=`hsl(${t}rad 95% 50%`,fillRect(w**.5,0,2,2)

Feb 4 2019 7:57 PM UTC

}// 140/140

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#rainbow #phyllotaxis with #squares -- thanks to u/pavel

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f8f82804

remix of d/12080 by u/stellartux

function u(t) {

with(x)setTransform(u=30*C(w=t&&w<469?w+2.4:1),v=30*S(w),-v,u,960,540),beginPath(),fillStyle=`hsl(${t}rad 95%50%`,fill(arc(w**.5,0,1.2,0,7))

Feb 4 2019 5:33 PM UTC

}// 140/140

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#rainbow #phyllotaxis

u/f8f82804

I'd wanted to do this without any trig, using rotate() and save()/restore(), but it was about 4 bytes too long.
u/pavel

135 with(x)setTransform(30,0,0,30,960,540),rotate(w=t&&w<469?w+2.4:1),beginPath(fillStyle=hsl(${t}rad 95% 50%),fill(arc(w**.5,0,1.2,0,7))

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stellartux

function u(t) {

with(x)t?(r=++n**.5,a=n*2.4,fillStyle=`hsl(${a},99%,50%)`,beginPath(),arc(34*r*C(a),34*r*S(a),25,0,7),fill()):(n=0,translate(960,540))

Feb 1 2019 5:30 PM UTC

}// 134/140

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#rainbow #phyllotaxis

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robbyg

function u(t) {

c.width|=0
x.shadowBlur=200
for(i=9;i--;x.fillRect(520+X,440,50,200))X=S(t)*400+i*100,x.shadowColor=x.fillStyle=`hsl(${X/4},70%,55%)`

Jan 11 2019 9:31 PM UTC

}// 133/140

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The rainbow behind #default

u/joeytwiddle

#rainbow

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katkip

remix of d/11595 by u/katkip

function u(t) {

eval(unescape(escape`挮獴祬攮扡捫杲潵湤㵒⠩Ⱳ㴨堬夬猩㴾筩昨猾㌩砮晩汬却祬攽恨獬⠤筳⩴紬㤰┬㐰┩怬砮晩汬剥捴⡘⵳ⱙ⵳ⱳ⨲ⱳ⨲⤬爨堭猬夭猬猯㈩Ⱳ⡘⵳ⱙ⭳ⱳ⼲⤬爨堫猬夭猬猯㈩Ⱳ⡘⭳ⱙ⭳ⱳ⼲⥽㭲⠹㘰ⰵ㐰ⰴ㠰⤻`.replace(/u(..)/g,"$1%")))

Dec 31 2018 11:36 AM UTC

}// 138/140

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T-square #fractal #recursion #recursive #rainbow

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chatmasta

function u(t) {

c=(y)=>Math.floor(255*S(Math.PI*(t+y/3))**2);
x.fillStyle = R(c(0),c(1),c(2));
x.fillRect(0+(t*2000),0,t*2000,1000/t*t);

Nov 30 2018 5:29 AM UTC

}// 121/140

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u/katkip

#rainbow

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