Dweets awesomed by u/pavel

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: #Opposites

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pavel

function u(t) {

for(f=c=>Math.tanh((r>1?3:13)*S(9*c/d)),Y=t/3-1,i=2e3;i--;x.fillRect(i,t*180,(1+f(X)*f(Y))*(d/2+Y/3.6),3))X=i/540-16/9,r=X*X+Y*Y,d=r>1||C(r)

Apr 22 2020 6:18 AM UTC

}// 140/140

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Experimenting with #raytracing. I finally figured out why the cosine trick from d/1112 works.

u/Cloud

WOW!

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rodrigo.siqueira

remix of d/18339 by u/rodrigo.siqueira

function u(t) {

for(i=2e3,f=(X,Y,n=-20)=>Y<i?f(X*X-Y*Y-.8,2*X*Y+.2,n+2):x.fillStyle=`hsl(${C(n/9)*55} 90% ${n}%`;i--;x.fillRect(i,t*90,1,i))f(i/490-2,1-t/6)

Apr 20 2020 6:00 PM UTC

}// 140/140

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Purple yellow #Julia Set #fractal with black background. Now with the Safari correction pointed out by u/pavel

u/pavel

Damn that looks nice
u/DataMeta

Beautiful!!

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rodrigo.siqueira

remix of d/18323 by u/pavel

function u(t) {

for(i=2e3,f=(X,Y,n=89)=>X<9?f(X*X-Y*Y-.8,2*X*Y+.2,n+2):x.fillStyle=`hsl(${n*2} 90%${n/2}%`;i--;x.fillRect(i,t*90,1,900))f(i/490-2,1-t/6)

Apr 19 2020 9:13 PM UTC

}// 136/140

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Color #Julia Set #fractal purple blue rays

u/pavel

Broken on Safari because of the missing space in the hsl
u/katkip

satisfying to watch
u/rodrigo.siqueira

Here is a version (with other colors) working on Safari: https://www.dwitter.net/d/18352

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rodrigo.siqueira

remix of d/18323 by u/pavel

function u(t) {

for(let i=2e3,f=(x,y,n=256)=>x*y<n?f(x*x-y*y-.6,2*x*y+.5,n-1):1-n/256;i--;x.fillRect(i,t*180,1,3))x.fillStyle=R(f(i/490-2,1-t/3)*i,0,i/14)

Apr 18 2020 6:34 PM UTC

}// 138/140

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Color #julia set for c = -0.6 + 0.5i #fractal

u/sigveseb

Nice colors

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Whimpers

function u(t) {

for(i=2e3,c.width=-1;v=26,p=i%3*3,i--;x.fillRect(150+p*S(P=i**.7)+v*C(V=i**.5),78+p*C(P)+v*S(V)*C(!p*i),1,1))c.style.filter=`sepia()invert(`

Apr 18 2020 5:14 PM UTC

}// 140/140

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u/katkip

#biology #virus #bacteria #organic
u/Xen

love it!
u/tomxor

Nice, I think this is a remix of d/17964 ? I recognise ye old p from saturn :P which I originally used it in

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pavel

remix of d/18322 by u/pavel

function u(t) {

for(let i=1920,f=(x,y,n=256)=>x*y<n?f(x*x-y*y-.8,2*x*y+.156,n-1):1-n/256;i--;x.fillRect(i,t*180,1,3))x.globalAlpha=f(i/540-16/9,1-t/3)

Apr 18 2020 8:32 AM UTC

}// 134/140

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#julia set for c = −0.8 + 0.156i

Show more comments…
u/pavel

Using x*y<n instead of the normal n&&x*x+y*y<2 is much shorter and creates the black whisps that look pretty cool.
u/pavel

This version makes it easy to play with different values of c. You can find some in https://en.wikipedia.org/wiki/Julia_set#Quad…
u/pavel

https://en.wikipedia.org/wiki/Julia_set#Quad…
u/pavel

Is link pasting broken?
u/Xen

Sexy!
u/katkip

wow
u/katkip

https://en.wikipedia.org/wiki/Julia_set
u/rodrigo.siqueira

Awesome and fast. I am remixing it to add color schemes and colorization methods.
u/Qwitter

SO FAST!

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pavel

function u(t) {

for(let i=1920,f=(x,n=420,a=0,b=0)=>a*a+b*b<n?f(x,n-1,a*a-b*b+x,2*a*b+.1133-t/4615):n/420;i--;)x.fillRect(i,180*t,f(i/8e5-.7467),3)

Apr 18 2020 5:59 AM UTC

}// 131/140

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(X=-0.7453, Y=0.1127, R=6.5e-4) section of the #mandelbrot set

u/pavel

This version draws 1x3 pixels to speed up rendering. for(let i=2e3,f=(x,n=420,a=0,b=0)=>a*a+b*b<n?f(x,n-1,a*a-b*b+x,2*a*b+.1133-t/13845):n/420;i--;)x.fillRect(i,60*t,s=f(i/8e5-.7467),s) looks better in fullscreen but is 3x as slow.
u/pavel

let and the automatic scoping of args in f makes this _really_ quick. I can increase the loop to 4e3 iterations and still have 60fps on my machine. Would be interesting to speed this up by rendering multiple rows per frame.
u/katkip

all dweets made by u/pavel are genius
u/Xen

godlike!
u/Qwitter

agreed !!!!

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pavel

function u(t) {

with(x)for(c.width|=f=i=>C(i/.647)+S(i),i=128;i--;fill(arc(960+f(t*2)*s*3,540+f(t+=.03)*s,s,0,7)))beginPath(fillStyle=R(s=1e4/(79+i),i%3*s))

Apr 18 2020 1:20 AM UTC

}// 140/140

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#snake ?

u/joeytwiddle

Certainly too long for a caterpillar. https://codegolf.dweet.net/a/271
u/pavel

Hah, nice

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iznax

function u(t) {

for(c.width|=i=9;i--;x.fillText([..."🌻🌹🌼🌷🐝"][i?i%4:4],i?-500+(i+t)*450%2400:1e3+C(t*3)*99,i?1e3:600+S(t*8)*40))x.font=(i?8:5)+"cm'"

Apr 18 2020 12:18 AM UTC

}// 131/140

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Bee Flower #Dancing

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pavel

remix of d/12336 by u/pavel

function u(t) {

for(i=t?w=600:a=b=0;i--;x.fillRect(w*b,w-w*a,1,1))[a,b]=[[3.4*a+b/6,a-b,b-a,0][q=Math.random()**t*4|0]/4,[3.4*b-a/6+2,a+b+1,a+b+.5,b][q]/4]

Apr 17 2020 11:24 PM UTC

}// 139/140

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Barnsley #fern #fractal #leaf #uncompressed

u/pavel

This version is also #improved with a #grow effect and a cap on how dark the image gets if you leave it for a while.
u/Xen

nice!

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