Top #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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Calada2

function u(t) {

b=500
x.beginPath()
x[c='lineTo'](a=S(t*9)*200+960,C(t*9)*200+b)
x[c](S(t)*b+960,C(t)*b+b)
x.strokeStyle=`hsl(${a},50%,70%`
x.stroke()

Apr 29 2020 8:28 PM UTC

}// 134/140

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#Rainbow #Star

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Xen

remix of d/14933 by u/username

function u(t) {

x.drawImage(c,0,7);for(j=2e3;j--;x.fillRect(j,0,j,7))x.fillStyle=`hsl(${2e2*t^j},61%,50%)`

Jul 7 2019 9:35 PM UTC

}// 90/140

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#rainbow #xor

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Xen

function u(t) {

for(c.width|=i=8e2,x.translate(960,540);i--;x.fillRect(i,i,99,99))x.fillStyle=`hsl(${i*T(t)},99%,45%,.1)`,x.rotate(t/49)

May 24 2019 8:24 PM UTC

}// 120/140

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#rainbow #trippy #waitforit

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Xen

remix of d/13722 by u/vinvol

function u(t) {

x.drawImage(c,0,9)
for(i=299;i--;x.fillRect(i*9,0,9,9))x.fillStyle=`hsla(${t*99^i*2},70%,50%)`

May 11 2019 4:13 PM UTC

}// 94/140

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#scroll #xor #rainbow

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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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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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rbong

remix of d/10574 by u/rbong

function u(t) {

for(n=200;n-=1/64;x.fillStyle=`hsl(${t*k*30},99%,50%)`,x.fillRect(n%3*666,n*5,16,16))for(r=i=0,k=28;--k/r;i=j)j=2*r*i+1-n/99,r=r*r-i*i-(n%3)

Oct 21 2018 3:46 PM UTC

}// 140/140

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Rainbow Cycling Mandelbrot

u/rbong

#rainbow #fractal #mandelbrot
u/rbong

This version has true color cycling, an animated Julia set, and is centered, but it's 18 characters over:
u/rbong

for(n=200;n-=1/64;x.fillStyle=\`hsl(${t*999+k*22},99%,50%)\`,x.fillRect(n%3*666,n*5,16,16))for(r=C(t*3),i=S(t*4),k=28;--k/r;i=j)j=2*r*i+1-n/99,r=r*r-i*i+1-(n%3)

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katkip

function u(t) {

for(i=0;i<2e2;i++)x.fillStyle=`hsla(${i*2+t*99},99%,50%)`,x.fillRect(960+S(t)*9*i,540+C(t)*9*i,C(t)*i*C(i+t),S(t)*i*C(i+t))

Aug 31 2018 8:23 AM UTC

}// 123/140

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3, 2, 1... SHOOT! #target #rainbow

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CocoMeister

function u(t) {

for(i=0;i<1920;i++){
y=t*i*Math.random()
x.fillStyle="hsl("+y/3 +","+i+"%,50%)"
x.fillRect(i*Math.random(),y,15,15)
}

Apr 24 2018 6:53 PM UTC

}// 117/140

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#rainbow

u/CocoMeister

#color

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Yogeshp3

remix of d/6244 by u/RUNIE

function u(t) {

c.width|=v=32
for(l=0;l<572;l++)d=l%v*v,x.fillStyle=`hsl(${t*150-d},99%,65%)`,x.fillRect(960+S(r=(1/C(t-d/5))+l/v*.35)*d,540+C(r)*d,v,24)

Jan 22 2018 4:19 PM UTC

}// 137/140

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washing machine swirel

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