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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New_Core

function u(t) {

for(i=130;i--;x.fill())r=Math.random()*500*S(t/2)+99,x.beginPath(),x.fillStyle=R(r,r/2,r/3,S(a=i*t)/30),x.arc(960+r*C(a),440+r*S(a),i/3,0,7)

Dec 30 2018 2:37 PM UTC

}// 140/140

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was messing around with some code and stumbled on this erupt of black smoke.

u/katkip

Paint?
u/katkip

Nvm, vulcano

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Undefined

function u(t) {

c.width^=0;for(i=360;i--;)x.globalAlpha=.5,x.beginPath(),x.ellipse(a=960+S(i+t)*100,b=540+C(i-t)*100,a%200,b%200,0,0,7),x.stroke()

Jan 2 2019 5:13 PM UTC

}// 130/140

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Accidentally made a 4D ring :D

u/katkip

Not really.
u/Undefined

It gets even more interesting if you change one of the radius values to a normal number, like 5...

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katkip

function u(t) {

c.width^=0;f=(X,Y,d)=>{if(d>30)x.arc(X,Y,d,0,7),f(X-d*C(d+t),Y,d/2),f(X,Y-d*S(d+t),d/2),x.stroke()}
f(960,540,300)

Dec 30 2018 12:21 PM UTC

}// 114/140

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Perfectly moving circles inside a circle #recursive

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JWinslow23

function u(t) {

P=t%18*60;if(P<1){c.width^=0;a=[1]}b=[];for(i=a.length;i--;){p=a[i];x.fillRect(960-P/2+i,P,p,p);b[i+1]^=p;b[i]=0^p}a=b

Dec 31 2018 7:53 AM UTC

}// 118/140

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My first Dweet! It's nothing too special, but I did as much golfing as I knew how to do.

u/katkip

Nice.
u/rodrigo.siqueira

It is possible to compress about 10% more with small goof tricks. 103 characters instead of 115: P=t*60;P<1?c.width^=a=b=[1]:0;for(i=a.length;i--;)p=a[i],x.fillRect(960-P/2+i,P,p,p),b[i+1]^=p,b[i]=0^p

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katkip

function u(t) {

eval(unescape(escape`挮睩摴桞㴰㭲㴨堬夬猩㴾筩昨猾㈩砮晩汬剥捴⡘ⱙⱳ⨲ⱳ⨲⤬爨堭猬夭猬猯㈩Ⱳ⡘⵳ⱙ⭳ⱳ⼲⤬爨堫猬夭猬猯㈩Ⱳ⡘⭳ⱙ⭳ⱳ⼲⥽㭸⹧汯扡汁汰桡㴮㔫䌨琪㈩⨮㌬爨㤶〬㔴〫䌨琩⨴㈰ⰴ㠰⤻`.replace(/u(..)/g,"$1%")))

Dec 31 2018 12:15 PM UTC

}// 131/140

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#infinite #sierpinski #recursion #layers #levels #grayscale #fractal #recursive

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katkip

remix of d/11581 by u/katkip

function u(t) {

eval(unescape(escape`挮睩摴桞㴰㭺㴨堬夬猩㴾筩昨猾㄰⥸⹦楬汒散琨堭猬夬猪㈬猯䌨琩⤬砮晩汬剥捴⡘ⱙ⵳ⱳ⼱〬猪㤩ⱺ⡘⵳ⱙⱳ⼲⤬稨堬夭猬猯㈩ⱺ⡘ⱙ⭳ⱳ⼲⤬稨堫猬夬猯㈩紻稨㤶〬㔴〬㈸〫䌨琪㈩⨲〩`.replace(/u(..)/g,"$1%")))

Dec 30 2018 9:35 AM UTC

}// 130/140

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Floating island of #fractal s #sierpinski

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ellisk1

function u(t) {

with(x)for(m=q=t*30|0;m-->q-99;fill(arc(960+(r=m**.5*20*C(m))*S(a=m**3),540+r*C(a),w,0,7)))beginPath(fillStyle=R((w=q-m)*2,0,0,1/w**1.48))

Dec 28 2018 1:29 AM UTC

}// 138/140

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VIRUS

u/katkip

#virus I hope this will not aggravate my cold.
u/BirdsTweetCodersDweet

:O

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13thptr

function u(t) {

c.width=w=400;x.fillText(x.font=m="17px Hello",0,19)
x.getImageData(0,0,w,j=99).data.map((e,i)=>e&&x.fillRect(j*C(i%w*.016-t)+j,i/w,3,3))

Dec 28 2018 11:13 AM UTC

}// 137/140

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Somewhat ambiguous because of implicit orthographic projection

u/13thptr

(first dweet :D)
u/13thptr

add |0 after i/w for a more solid look
u/lionleaf

Nice! Glad to see you make a first dweet :D
u/jylikangas

Welcome! Very nice 1st Dweet! Golfed to 131b -> c.width=w=400; with(x)getImageData(fillText(font="17px Hello",0,19),0,w,j=99).data.map((e,i)=>e&&fillRect(j*C(i%w/63-t)+j,i/w,3,3))
u/13thptr

thanks for the nice comments ! u/jylikangas cool tricks but it seems like inlining fillText in getImageData won't work in FF :(

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katkip

function u(t) {

r=(X,Y,s)=>{if(s>2)x.beginPath(),x.arc(X,Y,s*2,0,7),x.stroke(),r(X-s*2,Y,s/2),r(X+s*2,Y,s/2)}
r(960,540,230)

Dec 31 2018 12:02 PM UTC

}// 108/140

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only 108 bytes #recursion #recusive #circle #arc #fractal

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katkip

function u(t) {

c.width^=0;r=(X,Y,s)=>{if(s>3)x.fillRect(X-s,Y-s,s*2,s*2),r(X-s,Y-s,s/2),r(X-s,Y+s,s/2),r(X+s,Y-s,s/2),r(X+s,Y+s,s/2)}
r(960,540,t*99)

Dec 31 2018 11:27 AM UTC

}// 134/140

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T-square #fractal #recursion #recursive

u/katkip

Why this has no likes? wtf
u/joeytwiddle

It has two likes now. Is that above average? ^^