Hot dweets by u/FireFly

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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FireFly

function u(t) {

for(c.width|=i=0;i<40;i+=.025)R=S(t)/4+.25,r=.7-R,x.fillRect((A=R+r*S(D=i%1*44+88))*C(E=i+t/10)*480+960,(B=A*S(E)+r*C(D))*340+510,W=4-B*3,W)

Mar 6 2017 12:46 PM UTC

}// 140/140

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Torus-sphere thing

u/donbright

good one
u/SpecialAgent

excellent

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FireFly

remix of d/1853 by u/sebbert

function u(t) {

for(c.width|=a=b=z=0, w = 300; z < 400; z += .1)
  a = C(a+b+t) + C(z*3+t),
  b = C(z*1.56),
  x.fillRect(a*w + 900, b*w + w + w, 3,3)

Mar 5 2017 9:52 PM UTC

}// 134/140

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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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FireFly

remix of d/1690 by u/FireFly

function u(t) {

s=t?t<.1?s.replace(/\d/g,i=>+i?'-0+1+0-':'+1-0-1+'):s:'0';c=s[t*60|0];c<2?x.translate(0,16,x.fillRect(0,0,3,16)):x.rotate(c+1.05)

Mar 3 2017 4:49 PM UTC

}// 129/140

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Same as parent, but golfed and abusing time for the first 6 frames to evaluate/expand the L-system. The straight line at the start is an artifact of this and the particular choice of system.

u/donbright

love this method
u/SpecialAgent

love this series
u/katkip

#fractal

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FireFly

function u(t) {

t || x.translate(960, 540)
for (i=40; i--; x.rotate(S(t)))
 x.fillStyle = 'hsla('+i*t+',90%,50%,'+1/t+')',
 x.fillRect(v=i*20, v, i*t, i*t)

Mar 1 2017 8:05 PM UTC

}// 139/140

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Colour mania

u/iverjo

Nice!
u/Woodmouth

Ohh, if you wait long enough it goes grey, but then if you wait even longer, it quite suddenly goes back to color, and then suddenly even more grey
u/joeytwiddle

After that it ends up resting on a kind of shiny brushed metal pattern. Amazing!
u/joeytwiddle

#shiny
u/joeytwiddle

#color #rainbow (sorry for spamming the comments)

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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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FireFly

function u(t) {

for(s='0',i=5;i--;c=s[t*60|0])s=s.replace(/\d/g,i=>['0-1+0+1-0',11][i]);c<2?x.translate(0,32,x.fillRect(0,0,3,32)):+c||x.rotate(c+120/57.3)

Mar 1 2017 5:43 PM UTC

}// 139/140

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[Team dweet with u/PeCaN] L-system visualizer! Change initial state (s), #iterations (i), transition rules (['0-1+0+1-0',11]), which digits correspond to 'draw and move forward' (c<2), angle (120) to your own L-system ruleset. Digits 0-9 correspond to variables/constants (for each constant, add a rule that maps it to itself, i.e. to 'i').

u/5Mixer

Ha awesome! I was surprised when I saw this, I'd seen it on the internet before and was idly scribbling on the back of my book in a boring class today. Dope stuff :D

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FireFly

function u(t) {

if (!t) x.translate(X=960, 540)
x.fillStyle = 'hsl('+t*20+',90%,50%)'
x.fillRect(0, 0, X/t, X/t)
x.strokeRect(0, 0, X/t, X/t)
x.rotate(16/t)

Feb 28 2017 5:40 PM UTC

}// 140/140

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Rainbow flower

u/SpecialAgent

so pretty. good use of translation.

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FireFly

function u(t) {

f = (c, y, s) => x.fillRect(t*120, 540 + y*120, s, s, x.fillStyle = c)
f('#999', 0, 2)
f('#F00', S(T(S(T(S(t))))), 4)
f('#00F', T(C(t)), 4)

Mar 1 2017 3:02 PM UTC

}// 139/140

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Two interesting functions. T(C(x)) in particular looks a lot like a rounded triangle wave, which is pretty handy… mostly posting this as a meta-dweet/for reference. :)

u/sigveseb

perfect stuff for putting a community wiki!

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FireFly

function u(t) {

for(i=t?9:x.translate(960,540);i--;x.rotate(t))x.fillRect(i,t*69,2,9)

Mar 1 2017 6:41 PM UTC

}// 69/140

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Filing this one in the 'half-dweet' category

u/lionleaf

Hardcore
u/khalkeus

this is very pleasant to watch!
u/5Mixer

Crazy and yet very simple. Love the output :)

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