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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Current theme challenge: #Opposites

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Jezza

function u(t) {

f=C(t),g=100,k=3**f-2*C(4*t)-S(t/12)**5,x.fillStyle=`hsla(${t*g},100%,50%,.1)`,x.arc(960+S(t)*k*g,540-f*k*g,20,0,7),x.fill(),x.beginPath();

Jan 29 2018 10:05 AM UTC

}// 139/140

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Watercolour butterfly!

u/Punky

Cute!
u/donbright

:)
u/joeytwiddle

#rainbow #butterfly #cute

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firegodjr

remix of d/8393 by u/firegodjr

function u(t) {

with(x)for(c.width|=i=1e3;i--;beginPath())fillStyle='hsla('+i+',99%,50%,10%',x.arc(S(t+i/50)*i+960,C(t*2+i/50)*i+540,i/9+2,0,7),fill()

Jun 20 2018 4:10 PM UTC

}// 134/140

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u/magna

WOW!
u/magna

#spiral
u/firegodjr

credit goes to u/BirdsTweetCodersDweet for the og spiral ^^
u/joeytwiddle

#rainbow

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iverjo

remix of d/1791 by u/Run

function u(t) {

t*=4;c.width*=1;for(i=0;i<1550;i++)x.fillRect(X=i+S(t+i)*300,400+200*C(t+i)+200*S(X/300+t),50,50),x.fillStyle=`hsl(${X/7+t*90},80%,50%)`

Mar 2 2017 10:53 PM UTC

}// 136/140

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u/donbright

the happiest sandworm on dune
u/iverjo

#worm
u/iverjo

#colors #rainbow
u/iverjo

#sine

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joeytwiddle

remix of d/3116 by u/yokljo

function u(t) {

c.width|=k=150;for(j=k*6;j--;x.fillRect(300+i*9,180+b*k-i+(S(i**1.33/k-t*7))*i**.7,9,k))i=j/6|0,x.fillStyle=`hsl(${18*(b=j%6)**1.8},70%,55%`

Sep 5 2017 4:17 PM UTC

}// 140/140

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Pride Flag (unlit)

u/joeytwiddle

which coincidentally uses the exact same colours as the Mac spinner
u/joeytwiddle

This larger version has lighting and extra wobble: https://codegolf.tk/a/168
u/iverjo

#flag
u/f8f82804

#rainbow #pride

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richev

function u(t) {

x.lineCap='round'
x.lineWidth=20*t
x.beginPath()
c=6.28*t-1.5
x.strokeStyle=`hsl(${t*72},99%,60%)`
x.arc(960,540,270,c,c+.2)
x.stroke()

Aug 5 2018 6:54 AM UTC

}// 135/140

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Expanding rainbow loop

u/lionleaf

Very satisfying to watch #rainbow #donut

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robbyg

remix of d/8556 by u/Xen

function u(t) {

t&&x.drawImage(c,0,3)
for(Z=i=360;i--;x.fillRect(i*9-C(t+t-S(i/19))*Z-Z,0,Z,3))x.fillStyle=`hsl(${S(i)*Z},${z=25+i%55}%,${z*.8}%)`

Jun 12 2018 9:12 PM UTC

}// 130/140

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u/Xen

looks tasty, makes me hungry!
u/joeytwiddle

Yes, yummy. #rainbow

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Xen

remix of d/1201 by u/bligglenuber

function u(t) {

x.fillStyle=`hsl(${(t*=5e2)/2},80%,50%)`
x.globalCompositeOperation='difference'
x.fillRect(t%1920,t%1080,9,9)
x.drawImage(c,0,9)

Nov 3 2017 8:09 PM UTC

}// 129/140

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it's raining rainbow sierpinski triangles!

u/zanella

I just did https://www.dwitter.net/d/4677, but yours kicked the hell out of mine. :D
u/Xen

thank you :-)
u/f8f82804

#rainbow #fractal

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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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Xen

remix of d/14716 by u/username

function u(t) {

with(x)for(k=i=2e3;i---99;beginPath(fill(arc((i**3+p)%2e3,(i*i+p)%k,k/(i/(9+S(p)*8)),0,7))))fillStyle=`hsla(${i+(p=t*i)},99%,60%,.01`

Jun 24 2019 7:14 AM UTC

}// 133/140

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rainbow clouds

u/Xen

#waitforit
u/joeytwiddle

Variations: change i*i+p to i**t+p (fine) or i^p+t (coarse)
u/joeytwiddle

On iOS, slay the grey with 65% rainbow
u/Xen

#clouds #rainbow

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f8f82804

remix of d/9185 by u/f8f82804

function u(t) {

c.width=500;a=29;for(i=240;α=C(T=i/a-t),i--;)for(j=6;j--;x.fillRect(i,a+j*a+S(T)*7,1,30))x.fillStyle=`hsl(${a*j**1.4} 99%${9+a*(0<α)*α**2}%`

Aug 9 2018 9:22 PM UTC

}// 140/140

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Remix #rainbow #flag with improved palette and #phong #shading with better shadows- - #pride #pbr

u/f8f82804

Correct shadows are implemented with the 0<α factor. To golf this in, I had to drop the diffuse reflection term and reuse constants. Palette improvements just took tweaking without extra characters.
u/f8f82804

Loop restructuring also give a very slight FPS improvement.

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