Dweets awesomed by u/3bl3gamer

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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icecuber

function u(t) {

c.width=1920;for(i=24;i--;)for(j=24;j--;)t+=1.7,s=S(t)*((j+i&1)*2-1),x.setTransform(C(t),s,-s,C(t),i*99,j%12*99),x.fillRect(-9,-49,19,99)

Apr 20 2016 4:54 PM UTC

}// 137/140

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u/lionleaf

Try following the "wave" with your eyes!
u/innovati

This is amazing!
u/vain

amazing and beautiful effect. Nice tricky illusion

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icecuber

function u(t) {

t?i++:i=0;for(j=1080;j--;){a=b=0;k=35;for(;k--&&a*a+b*b<4;)c=a*a-b*b+i/540-2,b=2*a*b+j/540-1,a=c;x.fillRect(i,j,1,S(k/9))}

Apr 13 2016 1:46 PM UTC

}// 122/140

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u/iverjo

115 bytes: for(j=1080;j--;a=b=0){for(k=35;k--&&a*a+b*b<4;a=y)y=a*a-b*b+t*60/540-2,b=2*a*b+j/540-1;x.fillRect(t*60,j,1,S(k/9))}
u/iverjo

Here's one that draws faster: for(i=4;i--;){for(j=1080;j--;a=b=0){for(k=35;k--&&a*a+b*b<4;a=y,l=t*240+i)y=a*a-b*b+l/540-2,b=2*a*b+j/540-1;x.fillRect(l,j,1,S(k/9))}}
u/iverjo

Nvm, they depend on various variables being defined. I was fooled.
u/myJS

How about colors? t?i++:i=0;for(j=1080;j--;){a=b=0;k=35;for(;k--&&a*a+b*b<4;)c=a*a-b*b+i/540-2,b=2*a*b+j/540-1,a=c;x.fillStyle=R(k,j,i);x.fillRect(i,j,1,S(k/9))}
u/sfz

Nice enhancement myJS!
u/lionleaf

#scanline #slow_render #fractal #fractals

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iverjo

function u(t) {

c.width=2e3;n=900;for(i=9;i<n;i+=2)s=3/(9.1-(t/2+i/99)%9),x.beginPath(),j=i*9,x.lineWidth=s*s*3,x.arc(n,240*(2+s)/s,s*99,j,j+.6),x.stroke()

Feb 21 2016 9:05 PM UTC

}// 139/140

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#tunnel

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iverjo

function u(t) {

n=c.width=2e3;for(i=9;i<n;i+=2)s=3/(9.1-(t+i/99)%9),x.beginPath(),j=i*7+S(i*4+t+S(t)),x.lineWidth=s*s,x.arc(960,540,s*49,j,j+.6),x.stroke()

Feb 21 2016 9:05 PM UTC

}// 139/140

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u/3bl3gamer

200% cooler in fullscreen mode
u/5Mixer

Woah, this is freaking impressive!
u/iverjo

#tunnel

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iverjo

function u(t) {

c.width=96;for(i=-1;i++<5184;)X=i%96,Y=0|(i/96),r=((t*(t+50)*i<<t*24)%1e5)/1e5,x.fillRect(X,Y,r+S(t),r+C(t))

Feb 21 2016 9:00 PM UTC

}// 108/140

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u/magna

Wild!
u/iverjo

#noise

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iverjo

function u(t) {

c.width=2e3;for(i=8e3;i--;)p=3*t+i/9e3+i%4/.637,d=C(p)-S(p),d>0&&x.fillRect(999+149*S(p)+790*S(t+i/9e3+i%3*4.5),i/6-2,149*d,2/(d+1))

Feb 21 2016 8:54 PM UTC

}// 132/140

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Twisters dancing through each other

u/iverjo

#twister

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iverjo

function u(t) {

c.width=2e3;for(i=4e3;i--;)s=149/(i*3+199),q=s*99,x.fillRect(2e3*(T(i/9)+s*t)%2100-q,540+540*S(s*2e3),q,q)

Feb 21 2016 8:49 PM UTC

}// 106/140

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Try this in full screen. Move your head close to the screen and focus on one of small, slow-moving dots. It probably feel like you are moving sideways.

u/iverjo

You brain might also trick you into believing that the smallest dots are moving right
u/iverjo

I mean left
u/aemkei

down to 87 bytes: https://www.dwitter.net/d/2180
u/iverjo

#parallax

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iverjo

function u(t) {

A=Math.abs;c.width=1920;for(i=24;i--;)x.fillRect(A(1900-(500*t-i*90)%3800),1060-900*A(C(t*2-i/5)),20,20)

Feb 21 2016 8:31 PM UTC

}// 104/140

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#bounce

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iverjo

function u(t) {

c.width=198;X=Y=99,a=0,d=9;for(i=0;i++<30;)x.beginPath(),x.moveTo(X,Y),x.lineTo(X-=d*S(a),Y-=d*C(a)),d*=.9,x.stroke(),a+=S(2*t-i/12)/3

Jan 8 2016 1:22 AM UTC

}// 134/140

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u/stiaje

Nice blurring!
u/iverjo

The blur wasn't meant as a part of the effect. I believe it was done as a compromise to save a few bytes at a point during the process of creating the dweet
u/katkip

#plant

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