New #dither 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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Current theme challenge: #Opposites

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loktar

function u(t) {

for(r=100,!t&&x.scale(20,20),i=0;i<r*r;i++)X=i%r,Y=i/r,V=X-r,W=Y-r,d=V*V+W*W,x.fillStyle=R(d%(250*C(t)),0,d%(250*S(t))),x.fillRect(X,Y,1,1);

Jun 20 2019 11:54 PM UTC

}// 140/140

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Started as something completely different, thought this looked neat and fit in the limit.

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KilledByAPixel

function u(t) {

for(i=1080;i--;)x.fillRect(i^9*i/t,i,1,1)

Apr 18 2019 2:27 AM UTC

}// 41/140

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Super Tiny Fractal Part 2

u/DataMeta

#dither #fractal
u/joeytwiddle

Very nice #tiny
u/username

it is not a fractal though
u/KilledByAPixel

It is though... Also interesting if you change the ^ to a | or & it becomes an ordinary sierpinski triangle (also a fractal).
u/username

I agree with the Sierpinski triangle, but the other one is not a fractal on my screen.

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andrea270872

remix of d/12689 by u/andrea270872

function u(t) {

c.width|=q=25
p=q*q*t%2e3
D=(c,d)=>4e3/((z-c)**2+(w-d)**2)**.5
for(i=0;i++<q*q;)x.fillRect(z=~~(i/q)*95,w=i%q*60,m=D(p,450)+D(800,p),m)

Mar 21 2019 2:47 PM UTC

}// 135/140

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2 swimming magnets (ver2)

u/f8f82804

#halftone #dither

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andrea270872

function u(t) {

c.width|=q=25
p=q*q*t%2e3
D=(c,d)=>4e3/Math.sqrt((z-c)**2+(w-d)**2)
for(i=0;i++<q*q;)x.fillRect(z=~~(i/q)*95,w=i%q*60,m=D(p,450)+D(800,p),m)

Mar 8 2019 9:51 AM UTC

}// 140/140

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2 swimming magnets

u/13thptr

#metaballs
u/andrea270872

I see what you mean :) I was thinking of Coulomb law
u/f8f82804

#halftone #dither

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andrea270872

function u(t) {

I=t*3320%2e3;J=(t*94)%1e3
i=A=I/520-2;B=J/520-1
while((A*A+B*B<4)*(i++<40))[A,B]=[A*A-B*B+.3,2*A*B+.02]
x.globalAlpha=.6
x.fillRect(I,J,i,i)

Mar 7 2019 6:22 PM UTC

}// 140/140

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Ghost of Julia ver4 (with alpha!)

u/f8f82804

#dither #halftone #fractal

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andrea270872

remix of d/12677 by u/andrea270872

function u(t) {

I=(t*3350)%2e3;J=(t*94)%1e3
A=I/900-1;B=J/500-1
i=0;while(((A*A+B*B)<4)&&(i<25))[A,B]=[A*A-B*B-.8,2*A*B+.2,i++]
x.fillRect(I,J,i*=2,i)

Mar 7 2019 5:38 PM UTC

}// 134/140

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Ghost of Julia ver3

u/f8f82804

#dither #halftone #fractal

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andrea270872

function u(t) {

I=(t*3350)%2e3;J=(t*94)%1e3
A=I/1e3-1;B=J/600-1
i=0;while(((A*A+B*B)<4)&&(i<25))[A,B]=[A*A-B*B-.8,2*A*B+.2,i++]
x.fillRect(I,J,i,i)

Mar 7 2019 5:29 PM UTC

}// 131/140

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Ghost of Julia ver2

u/andrea270872

/* LOGIC The point (I,J) depends on t and scans the screen from top-left to bottom-right, then restarts. It also hops of circa 50 pixels in both directions. The point (A,B) is a scaled and translated version of (I,J); (A,B) is centered arund (0,0) and goes approximately from -1,5 to +1.5 in both directions. The loop is a simplified version of the Julia iterated fractal loop: - i starts from 0, and goes max to 25 iterations, and the point starts at z=A+i*B - the function being computed is: Z=Z^2+(-0.8,+0.2) separating real and imaginary part, the formula is: A = A*A-B*B-.8 AND B = 2*A*B+.2 and the notation [A,B] saves me from using a temp variable. The loop exits if: - i is 25 or - distance of (A,B) from (0,0) is more than 2 */
u/f8f82804

#dither #halftone #fractal

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@.+

function u(t) {

c.width^=0;
for(i=0;i<2000;i+=10){
for(j=0;j<1200;j+=10){
g=(a,c)=>S(Math.hypot(a-j,a-i)/100-5*t)*5;
m=g(200)+g(600);
x.fillRect(i,j,m,m);}}

Dec 28 2017 12:35 AM UTC

}// 140/140

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u/Xen

pretty sexy...
u/joeytwiddle

Looks good
u/joeytwiddle

#plasma #dither
u/magna

Cool!

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