Dwitter - javascript demos in 140 characters

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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Xen

remix of d/8815 by u/BuzzBee

function u(t) {

for(c.width|=i=99;i--;x.rotate(C(t)/1e3))x.fillRect(i*23,S(19*t-i/4+T(t)/9)*2e2+3e2,17,499)

Jul 6 2018 7:07 PM UTC

}// 91/140

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DataMeta

remix of d/8801 by u/Xen

function u(t) {

c.width|=0;for(i=17;i--;)x.lineWidth=i+6,x.stroke(),x.arc(960,540,356+180*S(i*t%i),t^i,t^i)

Jul 4 2018 1:36 AM UTC

}// 91/140

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u/magna

Awesome! So stylish!
u/hope4tg

so funky!

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micahcowan

function u(t) {

with(x)for(c.width|=j=50;--j;){for(i=m=28+4*j;--i;)r=25+i%2*25+45*j,lineTo(r*C(s=(1-j%2*2)*4*t/j+i*6.28/(m-2)),r*S(s))
stroke(),beginPath()}

Jul 6 2018 10:29 AM UTC

}// 140/140

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firegodjr

function u(t) {

with(x)for(x.m=e=>fillStyle=e,m("#0001"),fillRect(0,0,2e3,2e3),D=i=500;i--;)m("#f0f"),fillRect(S(i)*S(C(i)/1.27-t)*D+960,C(i)*D+530,10,10)

Jul 3 2018 5:03 PM UTC

}// 138/140

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Inspired to replicate https://www.reddit.com/r/loadingicon/comment…

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namklabs

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<c.height/20;i++)
x.fillRect(0,i*20,960+S(-t+i/10)*c.width/2,Math.max(2,Math.abs(S(t)*18)))

Jul 5 2018 10:09 PM UTC

}// 133/140

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L1Z1X

function u(t) {

x.fillStyle=`hsl(${t*100},100%,50%)`
x.arc(960,540,5,0,6.283185)
x.fill()
x.drawImage(document.getElementById('c'),-17.77,-10,1955.54,1100)

Jul 6 2018 1:03 PM UTC

}// 139/140

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jylikangas

function u(t) {

c.width|=P=(i,j,a,d)=>d&&x.stroke(new Path2D('M'+[i,j,i+=S(a)*99,j+=C(a)*99]))&P(i,j,a+C(d/2+t)/3,d-1)&P(i,j,a-C(t/2)/3,d-1);P(960,999,66,9)

Jul 1 2018 10:50 AM UTC

}// 140/140

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Fractal in the wind

u/micahcowan

Beautiful!
u/aleamb

#fractal #path2d
u/fujimotos

Looks like silver grass.

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nabbydude

function u(t) {

x.fillStyle=R(a=255-x.getImageData(...P).data[0])
x.fillRect(...P)
d+=(!a||-1)+4
d%=4
P[d%2]+=(d<2||-1)+h*2
P[d%2]%=h*2}P=[h=540,h,1,1]
{d=0

Jul 4 2018 5:26 PM UTC

}// 140/140

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Smallest I could pack Langston's ant

u/micahcowan

Ha. Is it kosher to break out of the function definition body like that? Seems like something u/lionleaf might have on his "to remove" list. :)

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DataMeta

remix of d/8474 by u/DataMeta

function u(t) {

c.width|=0;p=Math.PI;for(i=18;i--;)x.lineWidth=7,x.rotate(p*2),x.arc(960,540,(Math.abs(512*S(t*i/16))),t/i,i*t/p),x.stroke()

Jul 3 2018 5:18 AM UTC

}// 124/140

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t/i -> i for more uniform geometry

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davidsharp

remix of d/8796 by u/davidsharp

function u(t) {

with(x)for(i=n=23;--i;)F=(f,m)=>Math.abs(m-t*.7*f(i*1.5/n)*2e3%(2*m)),font='90px a',fillText('⚽️🏀🏈'.substr((i%3)*2,2),F(C,1920),F(S,1e3))

Jul 3 2018 8:54 AM UTC

}// 137/140

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Remixed from @micahcowan's https://www.dwitter.net/d/8781

u/davidsharp

swap .7 for speed, for crazy things like:with(x)for(i=n=90;--i;)F=(f,m)=>Math.abs(m-t*.4*f(i*1.5/n)*2e3%(2*m)),font='90px a',fillText('🌚🌝🍀'.substr((i%3)*2,2),F(C,1920),F(S,1e3))
u/micahcowan

Using u/magna's [...font] trick in d/8783, and removing an extra invisible character that appears in the list of balls (VARIATION SELECTOR - its absence may change the ball look for some people? didn't for me), it became possible to restore the screen-clearing. with(x)for(c.width|=i=n=23;--i;)F=(f,m)=>Math.abs(m-t*.7*f(i*1.5/n)*2e3%(2*m)),fillText([...font='90px ⚽🏀🏈'][5+i%3],F(C,1920),F(S,1e3))
u/davidsharp

That's a really neat trick 👌