New #Attractor dweets

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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rodrigo.siqueira

remix of d/12037 by u/thorbear

function u(t) {

u=v=t,a=b=.2*S(t)+1.2,c=.7,s=250,x.globalAlpha=.2;for(i=4e3;--i;)w=S(a*v)-c*C(a*u),v=S(b*u)+C(b*v),u=w,x.fillRect(650+s*u*2.5,880+v*s*2,1,1)

Feb 1 2019 6:56 PM UTC

}// 140/140

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Brushstroke (Hassan Massoudy style). #attractor

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robbyg

remix of d/8503 by u/robbyg

function u(t) {

X=Y=t;for(i=2e3;i--;x.fillStyle=`hsl(${C(X+Y)*360},50%,50%)`)h=X,x.fillRect(X=950+(S(1*Y)-C(2*X))*440,Y=550+(S(3*h)-C(4*Y))*230,1,1)

Feb 1 2019 4:59 PM UTC

}// 132/140

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Reworked my #attractor based on the excellent examples from @thorbear and @rodrigo.siqueira

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SMON

remix of d/12066 by u/thorbear

function u(t) {

t?0:z=y=c=a=1.4,b=1.56,d=-6.56,x.globalAlpha=.01;
for(i=2e4;--i;)n=d*S(a*z)-S(b*y),y=c*C(a*z)+C(b*y),z=n,x.fillRect(z*125+950,y*200+500,4,4)

Feb 1 2019 1:48 PM UTC

}// 140/140

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Okay, now with the original parameters!

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thorbear

remix of d/12058 by u/SMON

function u(t) {

t?0:z=y=s=2e2,a=0.9,b=2.7,c=0.2,d=-3,x.globalAlpha=.01;
for(i=s;--i;)n=d*S(a*z)-S(b*y),y=c*C(a*z)+C(b*y),z=n,x.fillRect(z*s+900,y*s+500,4,4)

Feb 1 2019 10:29 AM UTC

}// 140/140

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The one ring - would look better in gold with black background

u/thorbear

#attractor
u/SMON

So did you just fiddle with the values? :)
u/SMON

Ah...just saw your other comments. ;)
u/SMON

And remixed again. ;)

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SMON

remix of d/12056 by u/SMON

function u(t) {

t?0:z=y=s=2e2,a=0.9,b=2.7,c=0.2,d=-3.2,x.globalAlpha=.01;
for(i=2e3;--i;)z=d*S(a*z)-S(b*y),y=c*C(a*z)+C(b*y),x.fillRect(z*s+900,y*s+500,4,4)

Feb 1 2019 7:34 AM UTC

}// 140/140

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Hm. Closer...

u/thorbear

you need to store the next x,y position update into variables xn,yn then assign after. Or. Just the x.
u/thorbear

made a remix: https://www.dwitter.net/d/12066
u/thorbear

#attractor
u/SMON

@thorbear: oh, really? I assumed the comma operator would take care of that!

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rodrigo.siqueira

remix of d/12039 by u/rodrigo.siqueira

function u(t) {

W=t;for(y=i=950;i--;)x.fillRect(X=950+(S(3*y)+C(W))*440,y=550+(S(3*W)+C(2*y))*230,1,1),W=X

Feb 1 2019 4:12 AM UTC

}// 90/140

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Golfed #attractor in 90 bytes

u/thorbear

nice!

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rodrigo.siqueira

remix of d/12039 by u/rodrigo.siqueira

function u(t) {

t||(X=[...Array(K=2e3).keys()],Y=[...X]);for(i=K;i--;)h=X[i],x.fillRect(X[i]=950+(S(1*Y[i])-C(1*h))*540,Y[i]=540+(T(2*h)-C(4*Y[i]))*260,1,1)

Feb 1 2019 12:58 AM UTC

}// 140/140

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Peter de Jong equation. "the legs" #attractor

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thorbear

remix of d/8394 by u/loni_art

function u(t) {

t?(d=X+.2*(Y-X),e=Y+.01*(X*(28-Z)-Y),Z+=.01*(X*Y-8/3*Z),X=d,Y=e,x.lineTo(Z*20+o,X*20+o),x.stroke()):(X=.2,Y=Z=2,d=e=o=550)

Jan 31 2019 10:05 PM UTC

}// 122/140

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lineTo Lorentz

u/thorbear

#attractor
u/thorbear

I like the t? trick to do the update and init if t==0

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thorbear

function u(t) {

i=2e3,u=v=t,a=b=1.7,c=0.6,d=1.2,s=240,x.globalAlpha=.01;for(;--i;)w=S(a*v)-c*C(a*u),v=S(b*u)+d*C(b*v),u=w,x.fillRect(960+s*u,540+v*s,4,4)

Jan 31 2019 9:20 PM UTC

}// 137/140

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actual Clifford

u/robbyg

#attractor
u/rodrigo.siqueira

Clifford #pickover Attractor

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thorbear

function u(t) {

i=2e3,x.fillRect(0,0,i,i),u=v=t,d=1.4,s=400,x.globalAlpha=.01;for(;--i;)w=d*S(d*u)-S(d*v),v=d*C(d*u)+C(d*v),u=w,x.clearRect(s+s*u,s+v*s,4,4)

Jan 31 2019 9:05 PM UTC

}// 140/140

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spacetractor

u/thorbear

#attractor

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