Dweets awesomed by u/LimeLaser

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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WasifBoomz

function u(t) {

z=1920
if(t==0)a=0
a++
x.fillRect(Math.random()*z,Math.random()*1080,a,a)
x.fillStyle=R(a,a,a)
if(a>350)a=0

Mar 3 2019 2:26 AM UTC

}// 107/140

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sdavey

function u(t) {

c.width=4000;c.height=2100;x.font='99px x';
for(i=0;i<1190;i++)
x.fillText(String.fromCharCode(180+i),i*Math.sqrt(i*t),t/i-C(t+i)*690+1000);

Mar 1 2019 10:51 PM UTC

}// 140/140

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Xen

remix of d/12582 by u/nini1294

function u(t) {

c.width|=0,x.translate(960,540)
for(i=59;i--;x.arc(C(t*17+i/7)*9,S(t*9+i/2)*9,19*i,0,x.lineWidth=7))x.beginPath(x.stroke())

Mar 1 2019 5:35 PM UTC

}// 123/140

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u/katkip

Once I had eyes

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pavel

function u(t) {

for(c.width|=p=300;e=p--**.9%1;x.fillRect(960+r(0)/z,200+99/z,s=9*e/z,s))r=d=>p/(1+e*C(a=t/4+p))*C(a+p+d)+2*p/(1/e-e)*C(p+d),z=.5+r(1.6)/800

Feb 28 2019 6:54 AM UTC

}// 140/140

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Galaxy

u/pavel

300 bodies which individually only interact with an infinite mass at the center
u/pavel

Each body moves around an ellipse, the orbits are accurate. However, the movement speed is a very rough approximation.
u/pavel

Naively drawing an ellipse centers it around one of the focal points, however moving a body on this path slows the body down near this focal point and speeds it up near the other one.
u/pavel

The opposite effect is needed. So this code still moves a body around an ellipse but it re-centers the ellipse on the 'other' focal point.
u/pavel

In polar coordinates the difference between the x and y coordinates is a phase shift of pi/2 ~ 1.6

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digi_bytes

function u(t) {

for(i=-24;i++;){s=S(t);n=960;b=540;c=C(t)
x.fill(x.strokeRect(n+s*n,b+c*b,s*i,T(t*i*t)*i))
x.fill(x.strokeRect(n+s*260,b+c*180,s*i,s*12))}

Feb 27 2019 10:39 PM UTC

}// 138/140

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Got the eyeball down to under 140 chars!

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LimeLaser

function u(t) {

r=Math.random
p=t?p:Array(999).fill().map(z=>({x:1920*r(),y:1080*r()}))
p.forEach((z)=>{x.fillRect(z.x,z.y,1,1);z.x+=6-12*r();z.y+=4-8*r()})

Feb 5 2019 6:19 AM UTC

}// 140/140

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Mold Growth Via 999 Random Walkers

Show more comments…
u/katkip

Wow, nice technique.
u/LimeLaser

Thank you! I used the array instantiation from a dweet I've seen before, but couldn't find again. Your dweets are awesome, btw!
u/pavel

119 r=Math.random;p=t?p:Array(1e3).fill().map(z=>[2e3*r(),1080*r()]);p.map(z=>x.fillRect(z[0]+=6-12*r(),z[1]+=4-8*r(),1,1))
u/donbright

so awesome
u/qm3ster

115 r=x=>x*Math.random() p=t?p.map(([a,b]=[r(1920),r(1080)])=>[a+6-r(12),b+4-r(8),x.fillRect(a,b,1,1)]):[...Array(999)]
u/qm3ster

115 r=x=>x*Math.random();p=t?p.map(([a,b]=[r(1920),r(1080)])=>[a+6-r(12),b+4-r(8),x.fillRect(a,b,1,1)]):[...Array(999)]
u/qm3ster

112 r=Math.random;p=t?p.map(([a,b]=[1920*r(),1080*r()])=>[a+6-12*r(),b+4-8*r(),x.fillRect(a,b,1,1)]):[...Array(999)]. How do I delete comments?

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LimeLaser

function u(t) {

r=Math.random;(p=window.p||Array(6000).fill(0).map(()=>({x:1920*r(),y:1080*r()}))).map((d)=>{d.x=d.x>1920?0:d.x+1;x.fillRect(d.x,d.y,1,1)})

Dec 14 2018 7:19 AM UTC

}// 139/140

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Fade to Black / Persisting Values POC (CPU Intensive)

u/katkip

It is satisfying to watch

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