Dweets awesomed by u/donbright

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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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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donbright

remix of d/1857 by u/donbright

function u(t) {

w=128,c.width=2*w;for(i=w;i--;)for(j=w;j--;)c=S(t/3)*i*i+S(t/4)*j*j+S(t/5)*2*i*j,c=(c%w+w)%w,x.fillStyle=R(c,c,c),x.fillRect(64+i,8+j,1,1)

Mar 4 2017 8:07 AM UTC

}// 139/140

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As with 1857 this is an attempt to show the relation between Binary Quadratic Forms and the Circles and Squares pseudo fractal and Moiré pattern. This takes the basic ingredients of the Quadratic Form, x*x, y*y, and 2*x*y, and mixes them together, but slowly varies the amount of each ingredient over time with the Sine function. It is possible to see how all variations of the Quadratic Form result in similar patterns, transitioning from crcles to ovals to hyperbola patterns. Inspiration from this site and NJ Wildberger's rational geometr, Paul Bourke's http://paulbourke.net/fractals/circlesquares/ and Santiago Zubeta

u/donbright

https://twitter.com/zubie7a
u/SpecialAgent

wow! fascinating and purty :)

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donbright

remix of d/479 by u/lionleaf

function u(t) {

c.width=256;for(i=128;i--;)for(j=128;j--;){c=i*i+S(t)*j*j;c=(c<0?-c:c)%128;x.fillStyle=R(S(t+3.1)*c+c,0,S(t)*c+c);x.fillRect(64+i,8+j,1,1)}

Mar 4 2017 7:17 AM UTC

}// 140/140

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A transition from x*x+y*y (the Blue geometry, circles) to x*x-y*y (the Red geometry, hyperbolas). This shows a linkage between Binary Quadratic Forms and the Circles and Squares pseudo Fractal / Moiré pattern. By transitioning between two different Binary Quadratic Forms slowly, I hoped to show that the forms themselves are what form these patterns, not simply circles or hyperbolas or trig functions. Inspiration from many dweets on this site and Wildberger's Chromogeometry.

u/donbright

Binary Quadratic Forms are where you take any combination of x*x, y*y, and 2*x*y, for example 3*x*x+2*y*y (an ellipse), of x*x-y*y/2 (a squished hyperbola)

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SpecialAgent

function u(t) {

if(!t)x.translate(960,542),w=1e3,s=42;for(i=0;i<t%90;i++)X=i*s,W=w-X,x.fillStyle=`hsl(${i*t*64},99%,70%)`,x.rotate(1),x.fillRect(0,0,W,42)

Mar 4 2017 7:04 AM UTC

}// 138/140

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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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Memis

function u(t) {

for(i=0;i<8;i++){x.fillStyle=`hsl(${S(t/1.5)*255},100%,50%)`;x.fillRect(S(t*3.1415/4)*500+950,S(i*t/2)*500+500,5,5)}

Mar 4 2017 12:56 AM UTC

}// 116/140

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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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