Dweets awesomed by u/SpecialAgent

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: #ScaryMovies

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SpecialAgent

remix of d/1727 by u/SpecialAgent

function u(t) {

w=1920,h=1080,Ψ=[[9,h-9],[w-9,h-9],[w/2,9]],α=9,β=h-10;for(n=1000;n--;)x.fillRect(α,β,1,1),Δ=Ψ[Math.random()*3>>0],α=(α+Δ[0])/2,β=(β+Δ[1])/2

Mar 2 2017 5:26 AM UTC

}// 140/140

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Another Sierpinski fractal, this time generated via a RNG method.

u/donbright

cool

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SpecialAgent

function u(t) {

if(!t)c.width=900;for(Y=450,X=(t*60)>>0;Y--;)if(X&Y)x.fillRect(X,Y,1,1)

Mar 2 2017 12:14 AM UTC

}// 72/140

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I woke up at 1AM and realized I never played with Sierpinski triangles. What a shame!

u/donbright

very nice and simple
u/alien

Hi what does if(!t) mean :) ?

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sortie

function u(t) {

for(X=1920;X--;x.fillStyle=R(8*n),x.fillRect(X,t*60,1,1))for(C=A=X/960-1.5,D=B=t/9-1,n=0;n<32&C*C+D*D<4;n++)E=C*C-D*D+A,D=2*C*D+B,C=E

Mar 1 2017 10:43 PM UTC

}// 133/140

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u/SpecialAgent

Nice fractal!
u/hamptonio

Very nice using the time more internally, this is much faster than others I've modified.
u/vonzo

wow
u/katkip

Wow! This #fractal looks awesome

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FireFly

remix of d/1689 by u/FireFly

function u(t) {

for(s='0',i=6;i--;c=s[t*60|0])s=s.replace(/\d/g,i=>['+1-0-1+','-0+1+0-'][i]);c<2?x.translate(18,0,x.fillRect(0,0,18,3)):x.rotate(c+60/57.3)

Mar 1 2017 5:45 PM UTC

}// 139/140

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L-system visualizer. Sierpiński arrowhead curve

u/donbright

brilliant.... any description of how it works?
u/donbright

n/m i see you explain it in 1688, thanks!
u/tomkh

haha... using translate/rotate is a cool hack! reminds me of LOGO turtle
u/FireFly

Hehe, it's handy to offload the job of keeping track of the turtle to the canvas.
u/katkip

#fractal

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Niklas

function u(t) {

for(c.width|=0,q=100,i=q;i--;)for(a=i*.031+t*5,j=q;j--;)b=j*.031+t*5,x.fillRect(500+10*i+q*C(b),240+5*j+q*S(a),3,3);

Mar 1 2017 1:29 PM UTC

}// 116/140

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u/SpecialAgent

nice cloth :)

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FireFly

function u(t) {

t||x.translate(X=960,540,c.onmousemove=e=>X=e.offsetX);for(i=80;i--;x.rotate(8))x.fillStyle=`hsl(${X},80%,${i}%)`,x.fillRect(i,S(t)*960,i,i)

Feb 28 2017 9:39 PM UTC

}// 140/140

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Interactive demo! Move your mouse to change colour!

Show more comments…
u/FireFly

Thanks to veubeke and p01 for golfing tips :)
u/lionleaf

Oh wow! That's amazing
u/sigveseb

really nice!
u/iverjo

Sick!
u/profit

really cool!
u/lionleaf

On mobile you can tap at different locations for different colors
u/sfacci

ridiculously awesome
u/SpecialAgent

Excellent! And packed full of useful technical tricks, double whammy!
u/Xen

Done Re-mi(X)en
u/jaemiejaemie

borrowed the code used for capturing the mouse x on #4296, thank you
u/iverjo

#interactive
u/lionleaf

#spiral

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SpecialAgent

function u(t) {

Λ=100;for(X=20;X--;)for(Y=20;Y--;)x.strokeStyle='hsl('+X*Y*19+',99%,50%)',x.strokeRect(X*Λ,Y*50,Λ,Λ)
x.drawImage(c,S(t)-2,T(t)-2,1924,1084)

Feb 28 2017 7:18 PM UTC

}// 139/140

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u/iverjo

Trippy. Nice colors

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SpecialAgent

remix of d/1582 by u/sawaxon

function u(t) {

c.width=1920;x.font='9em a';
for(i=0;i<300;i++)
x.fillRect(i*5,S(i*5+t*i/200)*400+600,30,30),
x.fillText(':',i*5,S(i*5+t*i/200)*400+600);

Feb 28 2017 6:17 PM UTC

}// 137/140

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SpecialAgent

function u(t) {

π=Math.PI;h=540;q=S(t)
x.beginPath()
x.arc(960,h,q*q*h,1*π,3*π)
x.stroke()

Feb 28 2017 5:13 PM UTC

}// 74/140

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u/iverjo

Some interesting moirè patterns there
u/donbright

resembles 'circles and squares' fractal a little bit

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SpecialAgent

function u(t) {

q=960;r=q/2;c.width^=0;x.font='9em a';for(i=50;i--;)x.arc(q,r,r,t,i),x.stroke(),x.fillText(String.fromCodePoint(i<<9),q+S(t+i)*q,r+C(t)*5*i)

Feb 28 2017 2:19 PM UTC

}// 140/140

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u/donbright

interesting

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