Top dweets of all time

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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joeytwiddle

function u(t) {

t||(Y=0)
onmousemove=e=>{Y=e.pageY*.7}
c.width=568;for(y=320;y--;x.fillRect(0,y,568,1))x.fillStyle=`hsl(${30*((y-Y)/30|0)},99%,50%`

Jul 14 2019 5:01 AM UTC

}// 131/140

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Broken parallax scrolling effect (only works if you wiggle your mouse over the dweet while you scroll the page)

u/joeytwiddle

I tried various things but I couldn't find any way for the iframe to know when it has been scrolled. :-/
u/katkip

It impossible. Iframe's cursor doesn't update if mouse isn't moving inside iframe

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williambellwisdo

function u(t) {

c.width*=1;for(i=399;i--;x.globalAlpha=.3)x.beginPath(),x.ellipse(960+C(i)*70,540+S(i)*70,100,300,Math.floor(C(i/3+t)),0,7),x.stroke()

Jul 13 2019 7:59 AM UTC

}// 134/140

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Riff off of Katkip's great dweet two days ago. This is what happens if you floor the rotation angle.

u/joeytwiddle

Nice! If you edit another dweet you can hit Remix to post it.
u/katkip

^

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New_Core

function u(t) {

for(c.width|=j=24;j--;){x.beginPath()
for(i=5;i--;)x.lineTo(99*C(b=j+t/2)*S(a=i*2.52+t)+700*S(b)+960,540+99*S(b)*C(a)+99/C(b))
x.fill()
}

Jul 9 2019 6:02 PM UTC

}// 137/140

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u/13thptr

#stars

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New_Core

remix of d/14942 by u/katkip

function u(t) {

for(c.width|=i=99;i--;)x.arc(960+5*i*S(a=t+i%2*3.14),540,i**T(i/99)+i+50,0,7)
x.fill("evenodd")

Jul 8 2019 2:07 PM UTC

}// 95/140

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creating a wormhole

u/New_Core

99*i**T looks nice too
u/Xen

pretty cool

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taupelink

remix of d/14619 by u/taupelink

function u(t) {

for(i=w=2e3;i--;){X=(r=Math.random)()*w,Y=i*i/w/4
x.strokeStyle=`hsl(${X/40-60*C(t/3)+240},90%,${Y/8}%)`
x.strokeRect(X,w/2-2*Y,s=r()*99,4)}

Jul 6 2019 2:48 AM UTC

}// 140/140

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color oscillation thing

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katkip

remix of d/14863 by u/KilledByAPixel

function u(t) {

c.width|=c.style.background="#fff";for(j=2e3;j--;x.arc(960,540,430+60*S(j/20+a*9)*(C(a*9+t)/2+.6)**9,a,a))a=j/159+t/2,x.lineWidth=9
x.fill()

Jul 3 2019 4:06 PM UTC

}// 140/140

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veubeke

function u(t) {

with(x)t?(fillStyle='#fff',A=(Y,R,X=0)=>beginPath(arc(99+X,45+Y,R,0,7),fill(),stroke())||A,A(0,5)(1,5,10)(0,.5)(1,.5,9)(22,20)):scale(9,9)

Jul 1 2019 7:57 PM UTC

}// 138/140

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http://www.hurriyetdailynews.com/argentine-c…

u/joeytwiddle

#tribute
u/magna

:(

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donbright

remix of d/14804 by u/taupelink

function u(t) {

c.width=400
for(i=N=t>>33<<32;i>0;i--)
for(k=90;k--;){U=200+k*S(t+i)
V=99+k*C(t+i)
N%i?0:k>80?(x.fillText(i,U,V),k=80):x.fillRect(U,V,2,2)}

Jun 28 2019 11:57 PM UTC

}// 139/140

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prime o'clock in the morning

u/donbright

thanks to @taupelink for inspiration
u/taupelink

yay!
u/joeytwiddle

Fascinating! #primes #math U=200+k*S(a=i/1.91),V=99-k*C(a)

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KilledByAPixel

remix of d/14726 by u/KilledByAPixel

function u(t) {

c.width|=X=Y=Z=1
for(i=2e3;i--;x.lineTo(960+(X*C(t)-Y*S(t))*43,1160-Z*23))Z+=(X*Y-Z)/39,X+=(Y-X)/11,Y+=X*(27-Z)/96
x.lineWidth=9
x.stroke()

Jun 25 2019 3:04 PM UTC

}// 139/140

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3D #Lorenz Attractor 2

u/aleamb

#d3 #attractor
u/katkip

what is that rotation? clockwise or counter clockwise #illusion
u/katkip

not really 3D. the perspective is the save everywhere
u/katkip

it is 3D because the attractor is in space, but there is no perspective effect

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loktar

function u(t) {

for(S=10,D=750,x.scale(3,3),i=0;i<D*D;i+=S)!t&&x.fillText(~~(2*Math.random())?"╱":"╲",i%D,~~(i/D)*S);

Jun 25 2019 12:54 AM UTC

}// 101/140

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#c64 10 PRINT CHR$(205.5+RND(1)); : GOTO 10

Show more comments…
u/loktar

Always a bit longer in JS than on the Commodore.
u/loktar

If not for having to scale to make it viewable it can actually be smaller, removing scale and doing 2e3, vs 750 produces a nice result fullscreen.
u/loktar

#maze wow, some amazing implementations I'm glad I didn't check prior lol.
u/andrea270872

I learned programming with a C64! Ah, the nostalgia :)
u/loktar

@andrea270872 same here actually, although I've accumulated many more Commodores and various models since then haha
u/joeytwiddle

I just learned about that book today, through a different channel
u/joeytwiddle

C64 lovers might like this: http://www.oneliner64.com/