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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katkip

function u(t) {

t||(a=b=1);for(i=999;i--;)a+=S(b*C(t)+1),b+=C(a-S(b-a)),x.fillRect(60+a*500,1340+b*500,2,2)

Feb 14 2019 6:30 PM UTC

}// 91/140

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Black hole and white hole #attractor and now the space-time tranfer is visible

u/katkip

b+=C(a-C(b+a)/2) is interesting too
u/tomxor

I've never played with attractors, they are so simple and pretty :)
u/katkip

Exactly

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23_Skidoo

remix of d/12320 by u/23_Skidoo

function u(t) {

for(s=24,i=4e3;i--;f=((X-t*3)^Y)/9-t,x.fillStyle=`hsla(${S(f/128)*360} 75% ${s+C(f/s)*C(f*7+t)*70}%`)x.fillRect(X=i%82*s,Y=~~(i/82)*s,s,s)

Feb 13 2019 2:16 AM UTC

}// 138/140

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u/joeytwiddle

This is my favourite, smoothed: f=(X^Y)/9+t

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katkip

function u(t) {

q=259+t;t||(a=b=1);for(i=9;i--;)a+=S(b-C(t+i/3999)+C(i/9)/39),b+=C(a+S(t+i/3999)+S(i/9)/39),x.fillRect(540+a*q,540+b*q,5,5)

Feb 14 2019 4:06 PM UTC

}// 123/140

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#donut

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pavel

function u(t) {

eval(unescape(escape`𫐽𚁸𛁹𛁤👡𚡡𚱢𚡢𚐽🡛𨐬𨡝👛𚁹𚡢𚱸𚡡𚐯𩀬𚁹𚡡𛑸𚡢𚐯𩁝𞱦𫱲𚁪👴🰲𩐳𞡡👢👩🐰𛁳🐳𚠪𛠵𞱪𛐭𞱸𛡦𪑬𫁒𩑣𭀨𞐶𜀫𜐴𜀪𨐬𝐴𜀫𜐴𜀪𨠬𜐬𪐫𚰾𜑥𜰩𚑩𩠨𨐽𜐫𬰭𨐬𫐨𜰬𜀩𛁡𚰽𜐭𬰬𬠽𣑡𭁨𛡲𨑮𩁯𫐨𚐪𝀭𜡼𜀩𫐨𛐮𝐬𬠪𬰯𜠩`.replace(/u../g,'')))

Feb 13 2019 4:42 AM UTC

}// 135/140

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Apollonian gasket via an iterated function system

u/pavel

184 m=(x,y,d=a*a+b*b)=>[a,b]=[(y*b+x*a)/d,(y*a-x*b)/d];for(j=t?2e3:a=b=i=0,s=3**.5;j--;x.fillRect(960+140*a,540+140*b,1,i++>1e3))if(a=1+s-a,m(3,0),a+=1-s,r=Math.random()*4-2|0)m(-.5,r*s/2)

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23_Skidoo

remix of d/12291 by u/23_Skidoo

function u(t) {

for(s=24,d=360,i=4e3;i--;f=(C(X)*s+Y)/d-t,x.fillStyle=`hsla(${S(f)*d} 66%${C(f*9)*C(f*s+t)*51+Y/d*8}%`)x.fillRect(X=i%82*s,Y=~~(i/82)*s,s,s)

Feb 11 2019 9:11 AM UTC

}// 140/140

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u/pavel

FYI the trick of not putting a delimiter between s and l in the hsl call does not work in Safari, its all just black.
u/sigveseb

Kinda looks like a knitted sweater :)

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WasifBoomz

function u(t) {

//WasifBoomz is a pretty dang cool person if you ask him!
c.width=1800-t*50
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,500,50,S(t)*5000)

Feb 16 2019 4:18 AM UTC

}// 140/140

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u/katkip

....

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WasifBoomz

remix of d/12389 by u/WasifBoomz

function u(t) {

x.fillStyle=R(t*2,t*19,t*5)
x.fillRect(1000,0,Math.round(S(t)*10) * 200,5000)

Feb 16 2019 4:15 AM UTC

}// 78/140

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WasifBoomz

function u(t) {

x.fillStyle=R(0,t*1,t*1)
x.fillRect(0,0,Math.round(S(t)*10) * 200,5000)

Feb 16 2019 4:14 AM UTC

}// 73/140

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WasifBoomz

function u(t) {

c.width=t*5
x.strokeStyle=R(0,Math.random()*255,Math.random()*255)
x.strokeRect(35,15,S(t)*25.5,S(t)*25.5)
x.fillRect(35,15,S(t)*25,S(t)*25)

Feb 16 2019 3:43 AM UTC

}// 140/140

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WasifBoomz

function u(t) {

c.width=1920
x.fillStyle=R(255,0,0)
x.fillRect(0,500,5000,S(t)*500)
x.strokeRect(0,500,S(t)*5000,500)

Feb 16 2019 3:33 AM UTC

}// 101/140

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