Dweets awesomed by u/walsh9

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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walsh9

function u(t) {

c.width|=Y=(d,e,a,l)=>l?(x.moveTo(d,e),x.lineTo(d+=l*9*C(a),e+=l*9*S(a)),Y(d,e,a-S(t),--l),Y(d,e,a+S(t),l)):0;Y(960,999,4.71,14),x.stroke()

Mar 4 2017 5:56 PM UTC

}// 140/140

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fullscreen recommended

u/donbright

unbelievable!!!! wow
u/SpecialAgent

wonderful!
u/CocoMeister

#fractal

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Pyrofoux

function u(t) {

t||(k=0,i=s=1);for(a=9e4;a--;)s+=(i*=-1)/(++k+k+1)
c.width^=0;x.font="150px A";x.fillText("π = "+4*s,200,510)

Mar 4 2017 4:51 PM UTC

}// 110/140

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We can get a lot more decimals with Ramanujan, but I couldn't make it fit in a 140bytes

u/donbright

c.width|=M=Math;(26390*n+1103)/M.pow(396,4)
u/donbright

oops sorry wrong textarea!!!!
u/donbright

so uhh looks like Ramanujan maxes out the JS floating point type after about n=4
u/donbright

unless u calc pi using an 'nth digit' formula i guess.......
u/Pyrofoux

Yep, that's what I meant by "more decimals" :)

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SpecialAgent

function u(t) {

w=c.width=64;for(i=w*w;i--;)X=i%w,Y=i/w>>0,P=128+128*(S(X/8+t)+S(Y/8+t)+t),x.fillStyle=`hsl(${P},99%,50%)`,x.fillRect(X,Y,1,1)

Mar 4 2017 12:03 PM UTC

}// 128/140

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Old school plasma effect

u/iverjo

Good stuff
u/joeytwiddle

#plasma

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farter

function u(t) {

t||(f=s=1);s<<8&f||s>>24&255?(f|=s,s=1<<new Date,f>>24==-1&&(f<<=8)):s<<=8;c.width=63;for(i=32;i--;)(f|s)&1<<i&&x.fillRect((i&7)*8,i&~7,7,7)

Mar 4 2017 11:43 AM UTC

}// 140/140

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Show more comments…
u/parabola

Awesome!
u/iverjo

Tetris! Any way we could slow it down?
u/FireFly

Very nice! (i&7)*8 → i%8*8 should save you two bytes, btw
u/farter

@iverjo in fact at first i tried, but if it's slowed down, you'll see some wrong but minor behavior, due to saving bytes. and @FireFly thx, and the two bytes allowed me to solve one of them!
u/Renaud___

I am trying to do anything like that since 4 days ... with 180 char, cant golf it... full respect farter :)
u/joeytwiddle

#game #tribute
u/Cloud

#tetris

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scottglz

function u(t) {

c.width^=0;x.lineWidth=1080;x.setLineDash([110+S(t*3)*100,110+S(t*2)*100]);x.strokeRect(0,0,1920,1080)

Mar 4 2017 5:24 AM UTC

}// 102/140

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u/iverjo

+1 for the novel technique

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sebbert

function u(t) {

c.width=999;for(a=b=z=0,w=140;z<400;z+=.1)a=S(a*2.4-t)*S(t*2)+C(a+b+t)+C(z*2.34+t),b=C(z*1.56),x.fillRect(a*w+500,b*w+w+w,2,2)

Mar 4 2017 12:59 AM UTC

}// 126/140

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Show more comments…
u/donbright

woah!
u/SpecialAgent

Energize!
u/FireFly

This one is really cool o.o
u/FireFly

I would love an explanation or pointer about the maths going on here… in particular I don't understand why the 1.56 constant for the b= is so sensitive. It looks like an approximation of π/2, but all of π/2, 1.57 and 1.5 behave vastly differently/more chaotically. So what's the relationship between these numbers/how is 1.56 derived?
u/tapgiles

What the... @.@ Looks so detailed!
u/joeytwiddle

Some other constants with similar behaviour: 1.17, 2.34, 3.12, 3.51, 3.90, 4.68, 6.24
u/joeytwiddle

And a few with different behaviour: 3.08, 6.05 (!), 6.35

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dh7

function u(t) {

c.width+=0;for(i=-2;i<2;i+=.05)for(j=-4;j<4;j+=.05){
k=5*C(j/2)*C(j/2)+S(3.3*j-5.4*t)*C(4.2*i-4.1*t);x.fillRect(j*240+960,-i*240+540,k,k)}

Mar 4 2017 12:00 AM UTC

}// 140/140

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u/iverjo

Nice halftone smoke. This technique deserves more attention, in my opinion

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gormisdomai

remix of d/1273 by u/gormisdomai

function u(t) {

w=99;for(X=-30;X<w;X++)
for(Y=-30;Y<w;Y++){
x.fillStyle=R(99*(X%2),99*(Y%3),0);;
x.fillRect((X+S(t)*Y)*w-200,(Y+C(t)*X)*w-200,w,w)}

Mar 3 2017 10:46 PM UTC

}// 131/140

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Dislocation #4

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sigveseb

function u(t) {

A=Z=>{W=1920/Z;for(U=Z;U--;)for(V=Z;V--;x.fillRect(U*W,V*W,W,W))x.fillStyle=R(B=Math.random()*255,B,B,1/128);Z&&A(Z-1)};t||A(128)

Mar 3 2017 10:23 PM UTC

}// 129/140

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fake perlin noise

u/SpecialAgent

ah very good :)
u/iverjo

Nice texture
u/sfz

I'd tried to do this but couldn't fit it, nice squeeze!
u/sigveseb

#texture #perlin

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sfacci

remix of d/1093 by u/sfacci

function u(t) {

c.width=1920;
for(i=0;i<400;i++)for(j=0;j<6;j++){
x.fillRect(300*(j-S(t-i/j)),
150*(j-C(j-i))*j/i*t,
10,10)}

Mar 3 2017 9:49 PM UTC

}// 108/140

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