Dweets awesomed by u/fervour

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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DirtyDan

function u(t) {

for(c.width+=i=0;i++<99;x.globalCompositeOperation='xor')x.beginPath(x.fill()),x.arc(960+i*T(a=3*S(t)),540+3*C(T(i/120+(a<0?t:-t))),i*5,0,7)

Mar 25 2018 6:22 PM UTC

}// 140/140

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If you want to remix, for extra space delete "a=" and replace "(a<0?t:-t)" with t. That stuff just reverses the direction of the ripple depending on what side it's on.

u/magna

Awesome!
u/DirtyDan

check out d/6724
u/DirtyDan

* d/6812

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Agnes

function u(t) {

with(x)for(w=c.width|=i=0,translate(w/2,540);i++<500;r=2*w/i,rotate(o=S(t/35)),fillStyle=`hsl(${o*45*i},100%,50%)`,fillRect(m=-r/2,m,r,r));

Mar 25 2018 6:13 PM UTC

}// 139/140

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yonatan

remix of d/7461 by u/Agnes

function u(t) {

c.width|=0
a=Math.abs
for(i=99,s=400;i--&&s>10;s/=a(C(t))+a(S(t)))x.setTransform(A=S(t*i),B=C(t*i),-B,A,960,540),x.strokeRect(-s,-s,s*2,s*2)

Mar 25 2018 5:08 PM UTC

}// 140/140

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https://askalice.me/twojs-paradox-fractal/

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Agnes

function u(t) {

with(x)for(w=c.width=1920,i=100,translate(w/2,540);i--;r=w/i,rotate(T(t/30)),strokeRect(m=-r/2,m,r,r));

Mar 25 2018 4:46 PM UTC

}// 103/140

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(Looks way better in full screen.)

u/joeytwiddle

#tunnel #spiral #mercury #timeless #doctor_strange

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magna

remix of d/7457 by u/magna

function u(t) {

c.width=960
for(j=60;j--;)for(i=240;i--;x.fillRect(i*4,j*9,4,9))x.fillStyle=`hsl(${120*i},99%,${(S(i*j+t*9)+1)*25}%`

Mar 25 2018 3:59 PM UTC

}// 116/140

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#crt

u/magna

#rgb

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prplz

function u(t) {

x.fillStyle=`hsl(${t*=66},50%,50%)`
for(X=120;X--;)for(Y=60;Y--;)((X-60)**2+(Y-30)**2+t)**.45%1>.95&&x.fillRect(X*16,Y*16,16,16)

Mar 25 2018 10:04 AM UTC

}// 128/140

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jylikangas

remix of d/7410 by u/fujimotos

function u(t) {

for(c.width=i=250;i--;x.fillStyle="#"+i*19)x.fillRect(0,0,6,-49,h=(H=i/9-t)<0&&H,x.setTransform(K=C(z=h>-1?h:-1),-S(z),S(z),K,99*(H+2),99))

Mar 25 2018 7:24 AM UTC

}// 139/140

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Fujimotos original now with colors as suggested

u/fujimotos

The use of x.fillStyle here is very very clever. I love it.
u/fujimotos

#dominoes

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function u(t) {

for(j=0;j<6;j++) for(i=0;i<6;i++) {x.fillRect(450+i*200+S(t)*50,550+10*j/t*1/S(t)+C(t)*50,5,5),x.fillStyle=R(255-i*30,150-i*30,120+i*30)}

Mar 25 2018 12:18 AM UTC

}// 137/140

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alien

function u(t) {

c.width=w=320
for(i=30;i--;x.stroke())for(j=20;j--;x.fillRect(C(t)*i*5+w/2,S(.1*i*t)*j*5+w/4,2,2)){x.fillStyle=R(i**j,0,C(j*i)*w,w)}

Mar 24 2018 10:01 PM UTC

}// 138/140

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AbsoluteBlank

remix of d/7415 by u/L1Z1X

function u(t) {

y=200
w=525
z=b=>(S(b)*400+128)|0
for(i=0;i<845;i++){x.fillStyle=R(z(i),z(i-2),240,10)
x.fillRect(i*5+S(-t*i/y)*w,w+C(t*i/y)*w,-y,-y)}

Mar 24 2018 7:06 PM UTC

}// 134/140

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