Dweets by u/marc8

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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marc8

function u(t) {

c.width=628
for(i=-4;i<5;i+=.03){x.fillStyle=(i+4)%2<1?'blue':'tan'
for(j=77;j<549;)x.fillRect(++j,200+C(j/99)*i*(j<158||j>467?22:28),1,1)}

Jan 17 2021 7:00 PM UTC

}// 140/140

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Ceci n'est pas un bonbon

u/marc8

#candy

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marc8

function u(t) {

c.width=w=1920
p=t?p:Array(w).fill(0)
with(Math)for(m=min(...p),i=w;i;)p[random()*w|0]++,x.lineTo(i,(p[i--]-m)/(max(...p)-m)*1e3)
x.stroke()

Jul 1 2019 8:54 PM UTC

}// 140/140

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This is your PRNG distribution (let it run)

u/donbright

neat
u/joeytwiddle

#random

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marc8

function u(t) {

c.width=e=1920
t%=10
x.font='99px courier'
r=(a,b,z)=>`${z}`.repeat(e).slice(a,b)
x.fillText(r(f=t*e,f+12,u)+r(27,27+t,x)+r(f,f+21,c),0,600)

Jun 25 2019 9:06 PM UTC

}// 140/140

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Finding password as it happens in the movies

u/katkip

#text cool

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marc8

remix of d/14032 by u/marc8

function u(t) {

with(Math){a=-t;b=t;f=X=>1/cosh(X)
w=c.width|=p=i=0
s=w/frame
for(k=(b-a)/w;p<w;)x.fillRect(p+=s,q=w/4,s,-q*(y=f(a+k*p)),i+=k*s*y)
throw(i)}

May 21 2019 7:18 AM UTC

}// 140/140

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Infinity integration limits: use ±t for ±∞. Convergence not guaranteed.

u/13thptr

great
u/13thptr

#math

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marc8

function u(t) {

with(Math){a=1/E;b=E;f=X=>log(X)
w=c.width|=p=i=0
s=w/frame
for(k=(b-a)/w;p<w;)x.fillRect(p+=s,q=w/4,s,-q*(y=f(a+k*p)),i+=k*s*y)
throw(i)}

May 20 2019 9:08 PM UTC

}// 138/140

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Have fun integrating your functions from a to b. Use Math, but not my fault if you exceed the 140 chars ;)

u/Jezza

a=-1;b=1;f=X=>X*X*X-X
u/pavel

a=0;b=Math.PI;f=C
u/vinca

a=1/E;b=E;f=X=>S(X*9|t)
u/13thptr

#math

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marc8

function u(t) {

c.width|=0
with(x)for(j=3;j;j--){beginPath()
for(i=-4;i<9-C(t)*10;i+=.02)arc(a=i*99,q=-150+j*350,j*50,i-.01,i)
arc(a,q,99,i,i+6)
stroke()}

Mar 31 2019 5:06 PM UTC

}// 138/140

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Curtate, common and prolate throcoid

u/joeytwiddle

#math

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marc8

remix of d/12844 by u/marc8

function u(t) {

c.width|=p=-.5
g=(a,b)=>{for(i=6.28;i>0;){z=S(b*t+i*20+a/340)
x.arc(a,550,999+90*(z>p?z>1+p?1+p:z:p),i-=.01,i)}}
g(0,-6)
x.fill(g(2e3,6))

Mar 24 2019 5:23 PM UTC

}// 137/140

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Better shaped gears thanks to your suggestions

u/katkip

Awesome! even if I don't understand anything of the code
u/katkip

#gear
u/Qwitter

Mesmerizing

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marc8

function u(t) {

c.width|=d=.01
function g(a,b,n,r){for(i=6.28;i>0;)x.arc(a,550,r+50*(S(b*t+i*n)>0),i-=d,i)}x.fill(g(1400,9,14,300));x.fill(g(600,-9,21,450))

Mar 20 2019 10:39 PM UTC

}// 140/140

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Very rough gears. Don't try this at home.

u/tomxor

With an arrow function there is enough space for some tapered gears :) g=(a,b,n,r)=>{ then i-=d,i+.05)
u/tomxor

Arrow function seems to need a space after the } though !
u/somebody

c.width+=0 and replacing d with .1 directly saves two bytes. might be able to improve the tapering or something
u/katkip

#gear
u/aleamb

amazing!

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marc8

function u(t) {

c.width|=r=300
with(x){lineWidth=9
for(i=0;i<9;i++)fillRect(z=400+i*100+C(t)*r,400,50,200)
arc(z,h=500,10,0,7)
arc(310,h,r,t,t+6)
stroke()}

Mar 16 2019 2:48 PM UTC

}// 139/140

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#default engine

u/katkip

WOW
u/katkip

Genius idea
u/katkip

This deserves an awesome
u/f8f82804

#mechanism

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marc8

function u(t) {

c.width=480
z=99
for(j=-2*z;j<2*z;j++)
{k=j<-z?j+z:j>z?z-j:0
for(i=0;i<9;i++)x.fillRect(z+i*25+S(t)*75+2*k*C(t+k/z),z+j/4,12+10*k/z,1+k/z)}

Mar 15 2019 4:00 PM UTC

}// 140/140

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#default

u/Xen

nice
u/tomxor

Eery, feels like some kind of swimming creature!

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