New #Spiral 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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Pjaerr

function u(t) {

c.style.background=R();x.fillStyle=R(...[S,C,T].map(_=>127*(_(t)+1)));a=137.5*frame;r=8*frame**.5;x.fillRect(r*C(a)+960,r*S(a)+540,8,8)

Dec 30 2017 7:50 PM UTC

}// 135/140

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A little bit of Phyllotaxis. http://algorithmicbotany.org/papers/abop/abo…

Show more comments…
u/Pjaerr

btw, changing the angle a from 137.5 to 137.3 or 137.6 produce different, albeit nice, patterns.
u/Bendoman

Second best thing on here by far.
u/dubistdu

WOW
u/trupples

Also.. shouldn't it be 137.5 * pi / 180 ~~ 2.39982772149 as the trigonometric functions take in radians?
u/trupples

137.5 also kind of "isolates" the spirals after a short while while 2.4 does not
u/Pjaerr

Yeah, that'll be it actually. I still thought it looked decent!
u/DiamondDrake

I was just working on a Phyllotaxis dweet, though i was trying to use ellipse that just needs way too many characters
u/@no_identd

Although the point about radians is fully correct, I'd like to point out that the most accurate IEEE single float approximation of this angle in degrees is 137.50777 (which internally becomes 137.5077667236328125)
u/lionleaf

#spiral #flower #plant #botany
u/fujimotos

This is amazingly beautiful.

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rikardlindstrom

function u(t) {

!t&&x.translate(980,540)
for(i=99;i;i--){x.fillStyle='#'+(4E5+(255<<(w=t*i))).toString(16).substr(-6)
x.rotate(.3)
x.fillRect(l=-w/2,l,w,w)}

Dec 30 2017 6:15 AM UTC

}// 140/140

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Cecidi

function u(t) {

c.width^=0;for(j=1;j<99;j++){for(i=0;i<9;i++){x.beginPath();e=2*i*3.1415/9+j*t/50;x.arc(960+j*C(e)*12,540+j*S(e)*12,j,0,2*3.14);x.fill()}}

Dec 28 2017 5:24 PM UTC

}// 138/140

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u/nystrand

oh nice!
u/iverjo

#spiral

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zkfrontman

function u(t) {

for(c.width|=0,i=1;i<129;i++)p=t+2*i,x.fillStyle=R(255*S(p+4),255*S(p+2),255),x.beginPath(),x.arc(15*i,600+150*C(p),4*S(p)+11,0,7),x.fill();

Dec 28 2017 2:44 AM UTC

}// 140/140

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u/joeytwiddle

Nice colours
u/zkfrontman

:) thanks
u/hoppla1232

stylish
u/d0n.key

ayy u foken thief
u/f8f82804

#spiral #d3

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Xen

remix of d/3473 by u/veubeke

function u(t) {

t?x.rotate(.2/Math.log(t)):x.translate(960,540)
x.beginPath(x.fillStyle=R(T=t*2,0,S(t*T)*299,.4))
x.arc(T/.3-C(T)*9,0,T,0,7,0)
x.fill()

Nov 7 2017 6:10 PM UTC

}// 135/140

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u/lionleaf

#spiral

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New_Core

remix of d/2822 by u/hamoid

function u(t) {

a=9*S(t)
b=9*C(t)
x.fillStyle=`hsl(${t*50},99%,50%`
for(i=11;i--;x.globalCompositeOperation='hue')x.fillRect(960+i*a+t*a,540+i*b+t*b,20,20)

Jul 2 2017 10:04 AM UTC

}// 139/140

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u/donbright

this looks great...
u/13thptr

#spiral

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magna

remix of d/2635 by u/magna

function u(t) {

c.width|=0
x.globalCompositeOperation='xor'
for(i=55;i--;x.lineWidth=30,x.stroke())x.beginPath(),x.arc(960,540,i*20,a=t*5+i/9,a+Math.PI)

Apr 30 2017 1:31 AM UTC

}// 136/140

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u/donbright

groovy
u/magna

#spiral

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cantelope

remix of d/2449 by u/cantelope

function u(t) {

x.globalAlpha=.1
x.fillRect(0,0,(w=960)*2,w*2)
for(i=99;i--;p=.2*i+t,x.clearRect(w+1/(Z=3+C(p))*(i-50)*w/20,540+S(p)/Z*w,s=199/(Z*Z),s));

Apr 9 2017 2:07 AM UTC

}// 137/140

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u/donbright

wow
u/magna

I love this series.
u/magna

Golfed down by 5 characters: https://www.dwitter.net/d/2454
u/lionleaf

#perspective #spiral

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kchplr

remix of d/2012 by u/kchplr

function u(t) {

for(i=99;i--;A=T%6.35,r=30+((T/6.35|0))**1.05*15,r+=S(A+S(T*6))*(r/9+C(T)*5),x.fillRect(960+S(A)*r,540+C(A)*r,2+r/99,2+r/99))T=t*9+i/99

Mar 10 2017 8:31 AM UTC

}// 135/140

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u/jsizzle

Cool!
u/DataMeta

#hiddengem #spiral #topology

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bga_

function u(t) {

for(n=16,W=c.width|=p=0;++p<64*n;)r=Math.exp(U=(p&64?63-p%64:p%64)/9),x.lineTo(W/2+S(a=U+t+6.28*(p>>6)/n)*r,c.height/2+C(a)*r);x.fill()

Mar 9 2017 5:25 PM UTC

}// 135/140

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Hypnos! n = count of segments / 2

u/iverjo

Very nice!
u/iverjo

#spiral #opticalillusion
u/384.cz

AWESOME
u/384.cz

AMAZING

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