Dweets by u/BackendForth

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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BackendForth

function u(t) {

c.width|=0
f=(m,n,r)=>{x.fillRect(m+960,n+540,r,r)
if(r>0){f(4*m,4*S(t)*n,r-1)
f(C(r)*m-S(r)*n,S(r)*n+C(r)*m,r-1)}}
f(0,1,13)

Feb 3 2022 6:26 PM UTC

}// 125/140

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BackendForth

function u(t) {

v=_=>Math.random()
if(v()<.1)a=960,b=540,d=309,x.moveTo(a,b)
x.lineTo(a,b)
x.stroke()
e=v()*3
if(e<1)a+=d
else a-=d/2,b-=.87*(e<2?d:-d)
d/=2

Dec 30 2021 9:40 PM UTC

}// 140/140

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BackendForth

function u(t) {

c.width|=0
for(i=b=960;i>-b;i--)x.fillRect(b+i,0,5,640-i*i/1999+(n=S(i/29)>0?59:0)),x.fillRect(b+i,640+250/(1+2**(-t+8))-i*i/999+n,5,2e9)

Oct 11 2021 6:42 PM UTC

}// 137/140

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Toothy smile? Jack 'o Lantern come to life? #ScaryMovies

u/tomxor

Oh, my first thought was the cheshire cat
u/BackendForth

Ooh, good call
u/sigveseb

nice timing!

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BackendForth

function u(t) {

c.width|=0
for(i=540;i-=9;)x.arc(960+99*S(i/199-t),i+540,200+i/8,0,7)
x.fill()
for(j=2;j--;)x.clearRect(910+j*99+99*S(-t),540,11,11)

Oct 11 2021 5:51 PM UTC

}// 132/140

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#ScaryMovies

u/BackendForth

hmm, maybe this is more cute than scary
u/FireFly

definitely cute :p but no less awesome for that

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BackendForth

function u(t) {

c.width|=0
v=(p,q)=>x.lineTo(p*C(q-t)+960,p*S(q-t)+540)
x.beginPath()
for(i=-596;i<599;i+=.1)v((i<0)?-t*(-i)**.5:i**.5*t,(i*i)**.5)
x.fill()

Oct 6 2021 6:32 PM UTC

}// 140/140

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Fermat spiral

u/andrea270872

I love what that is doing to my eyes! :D

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BackendForth

function u(t) {

v=_=>Math.random()*1080
f=(n,m)=>x.fillRect(n,m,9,9)
if(!t)b=v(),c=v(),f(0,a=640),f(a,b),f(2*a,c)
f(t*a,(d=t-1)*(e=t-2)/2*a-t*e*b+t*d/2*c)

Aug 27 2021 1:42 PM UTC

}// 138/140

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Lagrange interpolation

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BackendForth

function u(t) {

if(!t)a=b=0
c.onmousemove=(e)=>{x.beginPath()
x.moveTo(a,b)
x.lineWidth=a/b
x.lineTo(a-=(p=a-e.x/.3)/9+(q=b-e.y/.3)/5,b+=p/5)
x.stroke()}

Aug 21 2021 1:50 PM UTC

}// 137/140

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Mouseover to doodle

u/andrea270872

#interactive

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BackendForth

remix of d/23330 by u/BackendForth

function u(t) {

for(i=6999;i--;){v=Math.random
a=v()*1920
b=v()*1080
x.fillStyle=R(0,n=255*.99995**((T(t)*99+960-a)**2+(540-b)**2),n)
x.fillRect(a,b,9,9)}

Jul 15 2021 12:39 AM UTC

}// 138/140

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u/magna

Loving this technique!
u/donbright

me too

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BackendForth

function u(t) {

for(i=599;i--;){v=Math.random
a=v()*1920
b=v()*1080
x.fillStyle=R(255*.9999**((C(t)*600+960-a)**2+(S(t)*400+540-b)**2))
x.fillRect(a,b,9,9)}

Jul 14 2021 12:51 PM UTC

}// 140/140

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BackendForth

remix of d/22806 by u/BackendForth

function u(t) {

c.width|=0
for(a=1920;a-=192;)
for(b=1080;b-=108;)
{i=a,j=b
for(k=299;k--;){x.fillRect(i,j,2,2)
i+=S((j-540)*(h=S(t)/35))
j+=S((i-960)*h)}}

May 20 2021 5:13 PM UTC

}// 139/140

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Adjusting the zoom on a phase space

u/rep_movsd

Wow I had a very similar dweet when experimenting yesterday by sheer coincidence
u/BackendForth

Great minds think alike?
u/katkip

smooth
u/joeytwiddle

Nice novel style. #hiddengem

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