Dweets awesomed by u/Xen

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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sandromiccoli

function u(t) {

x.strokeStyle=R(0,0,0,0.1);for(i=0;i<9;i++){r=t*i/100000;x.rotate(r);s=20+t*25*i;x.strokeRect(c.width/2-s/2,c.height/2-s/2,s,s)}

Jan 4 2018 2:16 AM UTC

}// 128/140

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u/magna

Pause, print, sell prints, profit!
u/sandromiccoli

<3

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lowpoly

function u(t) {

c.width=l=2e3;for(Y=0;Y<2e3;Y+=9,l=t+Y/99)for(w=5;w--;)x.fillRect((S(l)*Y/98-w/2+20)*50,Y,w*50,2e3,x.fillStyle=`hsl(${Y*4},100%,${5-w}0%)`)

Jan 4 2018 2:02 AM UTC

}// 139/140

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Another old effect

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p01

function u(t) {

for(c.width=n=128;n-=r=i=1/64;x.fillRect(n%2*64,n/2,k/32,1))for(Y=1-n*i,X=n%2-1,k=32;--k/r;i=j)j=2*r*i+X*S(t)-Y*C(t),r=r*r-i*i+Y*S(t)+X*C(t)

Jan 3 2018 9:41 PM UTC

}// 140/140

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Spinning Mandelbrot set

u/magna

We're going to need a bigger CPU.
u/iverjo

Nice effect! 22 FPS on my machine, in Firefox. Surprisingly, it runs much slower in Chrome and Edge (4 FPS)
u/sigveseb

Screeching by at 4FPS on my machine too :D nice mandelbrot though
u/donbright

feel like standing up and applauding. unbelievable.
u/rodrigo.siqueira

#mandelbrot #fractal

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veubeke

function u(t) {

t*60&127?0:T=[0,L=.001]
S=[c.width^=0]
T.map((_,i)=>S[i*2-1]=(_+T[i-1])/2+(Math.random(x.fillRect(i,540-_,2,S[i*2]=_))-.5)/L)
T=L<2?S:T
L*=2

Jan 3 2018 8:09 PM UTC

}// 140/140

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Simple terrain generation using midpoint displacement

u/iverjo

Nice alternative to perlin noise!
u/sigveseb

Very nice! And with the horizontal flat line we can pretend that is the sea level; everything above is a mountain and everything below is the sea :)
u/iverjo

#random

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M1T0

function u(t) {

t?x.fillStyle=`hsl(${t*99},90%,50%)`:c.width=350
for(i=199;i--;)x.fillRect(i+i*C(t-i),i+i*S(t+i),9,i)

Jan 3 2018 7:25 PM UTC

}// 101/140

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Messing with some code that Xen gave me

u/M1T0

Thanks to Xen for teaching me some JS
u/Xen

no worries mate ;-)

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lowpoly

function u(t) {

for(y=c.width=c.height=n=80;y--;)for(z=n;z--;)x.fillRect(z,y,1,1,x.fillStyle=((Math.sqrt(z*z+y*y))^(Math.atan2(y,z)*n+t*n))&8?'#4a8':'#445')

Jan 3 2018 6:44 PM UTC

}// 140/140

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Experimenting with a "classical" formula

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fourier.space

remix of d/5263 by u/fourier.space

function u(t) {

t||(y=Array(1e3).fill(1))
x.fillStyle='#eee'
y=y.map((y,r)=>(x.fillRect(y*2e3,4*r-3e3,2,2),r*S(3*y)/1e3))
x.drawImage(c,S(t),C(t),1921,1081)

Jan 3 2018 6:24 PM UTC

}// 140/140

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Snowy Mountains

u/fourier.space

Also remix of d/978
u/Xen

smooth

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hoplite

function u(t) {

t=C(t*9)*255
x.fillStyle=R(t+30,t,t+99,.1)
x.fillRect(C(t)*9+954,S(t)*9+534,9,9)
x.drawImage(c,-48,-27,2016+S(t),1134+C(t))

Jan 3 2018 12:18 PM UTC

}// 124/140

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u/Xen

nice, reminds me of Dr.Who
u/joeytwiddle

the theme tune was playing in my head as I read Xen's comment!

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Zolden

function u(t) {

c.width|=0;for(k=0;k++<1999;){j=k%20;q=j*j;
i=k/20;p=255-q*j/30;x.fillStyle=R(p,p,p,1);x.fillRect((q+75)*i-q*(t+8)*3,q*2,q/2,j*40)}

Jan 2 2018 11:29 PM UTC

}// 131/140

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Xen

remix of d/5282 by u/travistx

function u(t) {

x.globalAlpha=.1
x.lineWidth=99
x.strokeStyle=`hsl(${(Z=t*t/8)*7},100%,50%)`
x.beginPath()
x.fill(x.arc(960,540,Z%2*600,Z-1,Z+1))
x.stroke()

Jan 2 2018 10:59 PM UTC

}// 140/140

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little remix

u/crimbles

Trippy

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