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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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Xen

remix of d/14933 by u/username

function u(t) {

x.drawImage(c,0,7);for(j=2e3;j--;x.fillRect(j,0,j,7))x.fillStyle=`hsl(${2e2*t^j},61%,50%)`

Jul 7 2019 9:35 PM UTC

}// 90/140

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#rainbow #xor

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rodrigo.siqueira

remix of d/12440 by u/rodrigo.siqueira

function u(t) {

t||(a=b=0)
for(i=5e3;i--;)x.fillStyle=R(C(a)*200,S(a)*b/3,t*42),x.fillRect(960+b*S(a*.8),540-b*C(a*.8),1,1),a+=1.9*C(2.5*a)+C(t/5),b+=.00076

Jul 7 2019 9:15 PM UTC

}// 140/140

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Feigenbaum Flower. Homage to Mitchell Feigenbaum (1944-2019). He demonstrated the universal character of dynamical non-linear systems, which has made possible the systematic study of chaos. In 1975, using the small HP-65 calculator, he discovered that the ratio of successive distances between bifurcation events tends to a constant δ ≈ 4.66920... This "ratio of convergence" of period-doubling bifurcations is now known as the first Feigenbaum constant. #bifurcation #attractor #fractal #chaos #math

u/taupelink

This is a great tribute. RIP.
u/donbright

really nice
u/artfarnaa

Rodrigo - are you working full time on this fractal stuff? Super impressive if its only a hobby. Great work.
u/rodrigo.siqueira

#tribute

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katkip

remix of d/14942 by u/katkip

function u(t) {

c.width*=1;for(j=299;j--;){for(i=3;i--;)x.beginPath(),x.arc(960+i*200*T(t+i),540+S(t+i)*299,999/j,0,7),x.stroke()}

Jul 7 2019 9:42 AM UTC

}// 114/140

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2 black holes avoiding another black hole

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katkip

function u(t) {

c.width*=1;for(j=99;j--;){for(i=2;i--;)x.beginPath(),x.arc(960+i*500*S(t+i),540,4000/j,0,7),x.fill();x.globalCompositeOperation='xor'}

Jul 7 2019 9:38 AM UTC

}// 134/140

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Gravity fields (not actual physics) #xor #arc

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katkip

function u(t) {

eval(unescape(escape`𩡯𬠨𪠽𜠱𞱪𛐭𞰩𩡯𬠨𪐽𜠲𞱩𛐭𞰩𮱸𛡢𩑧𪑮𤁡𭁨𚀩𛁸𛡦𪑬𫁓𭁹𫁥👒𚀩𛁸𛡡𬡣𚁩𚠹𜀬𜰰𚱪𚠵𜀬𪠪𝐬𜀬𝰩𛁸𛡦𪑬𫀨𚐻𮀮𩡩𫁬𤱴𮑬𩐽𙱷𪁩𭁥𙰻𮀮𨡥𩱩𫡐𨑴𪀨𚐬𮀮𨑲𨰨𪐪𞐰𚰴𝠬𝀵𜀫𪠪𝐰𛁪𚠵𛀰𛀷𚐬𮀮𩡩𫁬𚀩𯐠`.replace(/uD./g,'')))

Jul 7 2019 9:21 AM UTC

}// 129/140

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that manga effect

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taupelink

function u(t) {

j=t?j+!(frame%30):0;for(i=32;i--;)x.fillStyle=`hsl(${99*i%360},99%,${(i%8+2*(i>>3)+t%7|0)&j?5:50}%)`,x.fillRect(i%8*240,(i>>3)*270,235,266)

Jul 7 2019 1:50 AM UTC

}// 139/140

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Colored squares, just modular arithmetic

u/donbright

mona lisa was just paint

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username

remix of d/13029 by u/username

function u(t) {

t*=9
for(i=3e3;i--;x.fillStyle=`hsl(${t*42},54%,50%`)K=(i&2)-t*t/i,X=S(i)+S(i)*K/t*9,Y=C(i)-C(i)*K/t*9,x.fillRect(960+X*150,640+Y*150,8,8)

Jul 6 2019 8:05 PM UTC

}// 138/140

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u/magna

Psychedelic!

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taupelink

remix of d/14855 by u/taupelink

function u(t) {

c.width=500;p=37;a=(t|0)%(p-1)+1;for(n=0,m=a;++n<=p;m*=a,m%=p)x.fillStyle=R((n-1)%(p-1)?0:255,0,(n-p+1)?0:255),x.fillText(n,12+m*12,7+n*7)

Jul 6 2019 6:29 PM UTC

}// 138/140

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Powers of a=1, 2, 3, ..., 36 modulo 37, arranged in rows. The 36th power is always 1; the 37th is a.

u/taupelink

#math #numbertheory Fermat's little theorem https://en.wikipedia.org/wiki/Fermat's_l…
u/DataMeta

Cool!

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username

remix of d/1385 by u/tbroadley

function u(t) {

eval(unescape(escape`睩瑨⡸⥦潲⡣⹷楤瑨帽椽㌻椫⬼㈹㭳瑲潫攨⤩扥杩湐慴栨愽椪匨琩⼴⤬慲挨㤶〬㔴〬㐰⩩Ⱘ戽琫愩㸨朽戫愫愩㽧㩢Ɫ㹧㽢㩧⤬汩湥坩摴栽椪㤬獴牯步却祬攽恨獬⠤筩⨪㉽ⰵ〥ⰵ〥总`.replace(/u(..)/g,"$1%")))

Jul 6 2019 4:38 PM UTC

}// 127/140

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#randomremix no 18 - golfed a lot but not enough :(

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username

remix of d/9095 by u/Agnes

function u(t) {

F=n=>C(n)^T(n/t|0);x.drawImage(c,0,l=9);for(j=214;j--;)x.fillStyle=`hsl(${(j+9)**t%3e2^-t%1},61%,50%`,x.fillRect(j*l,0,l,l)

Jul 6 2019 2:24 PM UTC

}// 123/140

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#randomremix no 17 - it looks so random duh