Dweets awesomed by u/baon

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: #Food

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pavel

function u(t) {

for(j=t?1e3:a=b=0;j--;x.fillRect(960+450*a,540+450*b,1,1))s=Math.random()<.5?-1:1,A=(Math.hypot(a,++b)+a)/2,b=(b<0?-s:s)*(A-a)**.5,a=s*A**.5

Feb 13 2019 9:09 PM UTC

}// 140/140

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IFS #julia attractor for c=i. Play with adding different constants to a and b in the Math.hypot call

u/pavel

a+=.123,b+=.745 is called Douady's rabbit fractal
u/katkip

How! Amazing
u/13thptr

#fractal

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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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pavel

function u(t) {

with(x)for(c.width|=j=88,scale(9,9);i=j-->>3;arc(107+3*(9-i)*S(p/2),60,6*i,A=(j%8-6||beginPath(stroke()))*11/7+p/4,A))p=S(a=5*t-i/5)+a

Feb 9 2019 11:07 PM UTC

}// 134/140

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Square dance #beesandbombs

u/katkip

#loop

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pavel

remix of d/12230 by u/pavel

function u(t) {

for(c.width|=p=2*Math.PI,x.scale(9,9),i=13;j=i--*p/6;x.arc(107+45*C(A=j-t/4+i*p/12),60+45*S(A),14,a=(t+j)%p,a));x.stroke()

Feb 8 2019 8:33 PM UTC

}// 122/140

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I like how the corners are "walking"

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rodrigo.siqueira

remix of d/11965 by u/pavel

function u(t) {

for(x.fillRect(0,0,i=3e3,i);Q=S(--i*i);x.clearRect(960+150*(S(b)*4+S(i+t)*Q),540+150*(C(i*i)-(t%4>2?T(b+t):S(b+t))),4,4))b=i%6+t+(t%2>1?0:i)

Jan 28 2019 2:40 PM UTC

}// 140/140

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Torus, spheres, flow and bubbles

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u/rnbw

now THIS is a demo!
u/katkip

Yeah he win
u/13thptr

woah
u/joeytwiddle

Superb! Golf the end with i*(t%2>1) or i*!(t&1)
u/rodrigo.siqueira

Thanks @joeytwiddle for the golf trick. i*(t&1) also works and it's even shorter. And I found that t%4>2?... can be converted to t&2?... It works as a counter to change the function each 2 seconds.
u/yonatan

Also, since T and S take the same arguments (t%4>2?T(b+t):S(b+t)) can be (t&2?T:S)(b+t)
u/lionleaf

Wow! Now we're talking
u/vain

Wow, three fx in this tiny code? Great!

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joeytwiddle

remix of d/11968 by u/joeytwiddle

function u(t) {

c.width|=0;o=t*7%15.7-22/7;j=o>0;w=(99-j*80-j*o*1.6)*S(!j*o+j*o*4);x.ellipse(920,850-j*600*S(o/4)-w,200-w,200+w,0,0,7);x.fill()

Jan 27 2019 5:54 AM UTC

}// 127/140

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New_Core's bouncing ball + squash = jumping jack

u/katkip

Nice
u/katkip

#physics #jelly
u/DataMeta

Delightful!
u/joeytwiddle

Change o*4 to o*3 for a slower wobble

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joeytwiddle

remix of d/2754 by u/New_Core

function u(t) {

P=200;A=Math.abs;t?c.width|=0:a=1;d=A(500*S(t));a=d<5?20:a<0?0:a-.1;x.ellipse(P+A(P*t%3040-1520),840-d,a*S(t*9)+P,a*C(t*9)+P,0,0,7);x.fill()

Jan 27 2019 5:39 AM UTC

}// 140/140

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New_Core's bouncing ball + walls

u/13thptr

great #bounce #ball

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pavel

function u(t) {

t?c.width|=0:(i=A=240,j=B=80,p=q=-9)
x[f='fillRect'](i+=p=i<7*A?p:-p,840,A,A)
x[f](j+=q=j>0?q:-q,1e3,B,B)
j>i-B&&(j=i-B,p+=s=(q-p)/5,q-=s*9)

Jan 24 2019 10:56 PM UTC

}// 140/140

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Perfect elastic collision #physics #simulation

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u/pavel

Big block is 9x the weight of the little block
u/katkip

This is impressive. Idea from 3blue1brown?
u/iverjo

Wow!
u/bekfast2390

This is like ping-pong!
u/joeytwiddle

Some context: https://www.youtube.com/watch?v=HEfHFsfGXjs 3Blue1Brown
u/katkip

hi, PI
u/Undefined

A fellow 3b1b fan, I see :D
u/joeytwiddle

#3b1b
u/ivylab

I always wait until the big one gets way up to the left side and it goes bam bam bam bam bam :)

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cantelope

remix of d/11465 by u/pavel

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡦楬汒散琨〬〬挮睩摴桼㵩㴵ⰲ攳⤬獣慬攨㤬㤩ⱱ㵃⠵⩴⤻椭ⴻ晩汬⡳瑲潫攨⤩⥳瑲潫敓瑹汥㵦楬汓瑹汥㵠⍦〸怬浯癥呯⡘㴷㈫ㄷ⩩ⰰ⤬慲挨堭㘵⩓⡡㴨焾〿椺椭㐩㽱⼵〺焩ⰶ㔪䌨愩ⰸⱡⴱ⸵㜬㜩`.replace(/u(..)/g,"$1%")))

Dec 20 2018 7:24 PM UTC

}// 139/140

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u/katkip

More #physics?

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pavel

function u(t) {

for(c.width|=i=16,x.scale(2,2);i--;x.moveTo(480,0),x.arc(480-r*S(a=C(40*t/r**.5)),r*C(a),r/16,a-11/7,9))r=4e4/(9+i)**2;x.stroke();x.fill()

Dec 20 2018 7:18 AM UTC

}// 138/140

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#pendulum #waitforit

u/katkip

Nice
u/cantelope

can save a byte by nesting x.fill(x.stroke())
u/katkip

It's better than d/6440

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