Top dweets by u/sfz

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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sfz

remix of d/2351 by u/nonce

function u(t) {

c.width=w=512
with(x)fillRect(0,h=240,w,w),clearRect(t*999%w-31,h+7,93,9),font='9em a',fillText(['🚗','🚃','🚙'][~~(t/2)%3],w-(t*w&1023),h)

Mar 31 2017 4:25 AM UTC

}// 136/140

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sfz

remix of d/672 by u/aemkei

function u(t) {

for(c.width=874,b=[d=this.b||0],i=5e3;i--;x.fillText(b[i]=d?a==3|d[i]&a==2:i%7%2,i%96*9,i/9))for(a=0,j=5;e=93*(2<j--)+j;)a+=d[i+e]+d[i-e]

Mar 1 2017 7:18 PM UTC

}// 137/140

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Life in Bits

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sfz

remix of d/1962 by u/sfz

function u(t) {

w=950
V=t%13+3
for(i=V;i>0;i-=2/w)x.fillStyle=`hsla(${7*t*i},66%,66%,.2)`,x.fillRect(w+w*S(t*i+2*V),w/2+w/2*S(V*i+2*t+3),V,V)

Mar 8 2017 7:22 PM UTC

}// 125/140

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Harmonograph II.2

u/donbright

i like these colors
u/sfz

I call it Mathematician's Plaid

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sfz

remix of d/2171 by u/sfz

function u(t) {

c.width=w=540;t*=7;for(i=l=129;i>69;t+=i--)for(j=7;j--;)h=t*i%w,a=h-l>l,x.fillRect(t%w+(a?9*S(t/j):0),a?w/2+h%7*C(t/j):h,h<w*.6,a||9)

Mar 18 2017 5:47 AM UTC

}// 133/140

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Bit rainy

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sfz

remix of d/2158 by u/sfz

function u(t) {

c.width=w=480;x.fillRect(0,0,w,w);t*=3;for(i=99;i--;t+=i)for(j=7;j>0;x.fillText((u+'')[~~t*j%137],t%w,t*i%w-i*j--))x.fillStyle=R(0,i?w:0)

Mar 17 2017 5:15 AM UTC

}// 137/140

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Metamatrix

u/donbright

i wonder if there is a way to mix this with Kalanchoe's technique from https://www.dwitter.net/d/1395
u/donbright

something like this r=Math.random t?o.push({X:480*r(),c:~~(r()*99),Y:0,ẏ:1}):(o=[]) c.width=480 o.map(a=>(x.fillText(String.fromCharCode(a.c++),a.X,a.Y+=a.ẏ)))
u/sfz

well, if you change the for loop to something like for(i=99;i>18;t+=i--) it gets rid of the clumpy crap on the left side, but I didn't figure that out until afte posting.
u/scottglz

The clumpy crap is my favorite part
u/joeytwiddle

#matrix

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sfz

remix of d/1479 by u/sfz

function u(t) {

c.width=w=2e3
d=new Date
t?!(d&9)&&o.push([d%w,0,0,d%9]):o=[]
o.map(a=>(x.font=a[3]+'em ø',x.fillText('❄',a[0],a[1]+=a[2]+=a[3]*a[3]/w)))

Feb 27 2017 11:03 PM UTC

}// 137/140

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Snowflakes with gravity acceleration and parallax

u/sfz

err, depth that is, small ones fall slower as if they're further away :P
u/joeytwiddle

#snow I think it's fair to call that parallax, just vertical

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sfz

function u(t) {

x.drawImage(c,-9,-4,1937.8,1089)
for(i=9;i--;)H=9*S(t),G=9*C(t),x.fillStyle=`hsl(${t+=9*i+t/9},90%,60%`,x.fillRect(960+i+G-H,470+i+H+G,6,6)

Mar 21 2017 8:48 AM UTC

}// 139/140

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Neutron

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sfz

function u(t) {

W=c.width|=0
for(i=q=20,h=q*9,H=3*h;i>0;i-=.01)N=C(t*q),O=C(i),V=3**O-2*C(4*i)-S(i/q)**5,x.fillText('🦋',W*t%4e3-H+h*O*V,H+h*(N+N*S(i)*V))

Mar 8 2017 7:06 AM UTC

}// 137/140

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Butterfly for my daughter

u/sfz

(Chrome only)
u/magna

Awesome!
u/sigveseb

Creative ^^
u/donbright

works in newer firefox!!!
u/sfz

woohoo

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sfz

function u(t) {

for(i=1,l=255;i<l;i++)j=t%9*i,k=i*t%l,m=S(t+j),x.font=j+'px a',x.fillStyle=R(i,k,l-i,m/i),x.fillText('❖',900+j*m*S(i*j),540+j*C(t+i)*S(t-j))

Feb 26 2017 7:38 AM UTC

}// 140/140

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u/sigveseb

watch this for a while, worth the wait!
u/iverjo

Fascinating

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sfz

remix of d/2376 by u/magna

function u(t) {

for(i=0;i<(半=500);i++)x.fillStyle=R(0,i?w:0),x.fillRect(i?2*半+i*C(T=t-(Math.random()<3e-4)*.2):x.globalAlpha=.1,i?半+i*S(T):0,z=i?8:w=2e3,z)

Apr 1 2017 4:12 PM UTC

}// 139/140

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Green, but the blips are harder to see

u/sfz

Increasing alpha helps see them, but makes the line sweep less cool
u/magna

They are ninjas. Harder to see.
u/donbright

lol nice

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