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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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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sfacci

remix of d/1844 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)),
450+400*(C(j-i))*S(t/j),
10,10)}

Mar 3 2017 9:51 PM UTC

}// 111/140

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sfz

remix of d/1839 by u/sawaxon

function u(t) {

A=p=>p>0?p:-p
m=49
l=40
for(j=l;j--;)for(i=l;i--;)x.fillStyle=R(l*A(S(t-j)+i/6),S(t/j)*l*j/(i/9+1),m*S(i)*C(t)+9*j),x.fillRect(i*m,j*m,m,m)

Mar 3 2017 7:25 PM UTC

}// 139/140

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u/donbright

very chilled out

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hamptonio

function u(t) {

r=540;m=t%99|0;for(n=1;n<m;n++){c.width=2e3;for(i=0;i<6.3*n;i+=.01){q=r*C(i*m/n);x.lineTo(2*r+C(i)*q,r+S(i)*q)}x.fill("evenodd");x.stroke()}

Mar 3 2017 6:12 PM UTC

}// 140/140

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u/iverjo

Kudos!
u/donbright

excellent

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sawaxon

function u(t) {

c.width=1920;S=p=>Math.abs(p)
for(j=0;j<20;j++)
for(i=0;i<20;i++){x.fillStyle=R(S(i)*25,S(j)*20,S(t+5)*40);x.fillRect(i*99,j*99,99,99)}

Mar 3 2017 6:12 PM UTC

}// 135/140

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brianholley

function u(t) {

t||x.translate(960,540);x.rotate(t);for(i=0;i<18;i++)x.fillStyle=`hsl(${20*i},60%,60%)`,x.fillRect(40+i*40,i*(40+C(t)),40,8)

Mar 3 2017 5:38 PM UTC

}// 124/140

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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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Pyrofoux

remix of d/1807 by u/fnurgel

function u(t) {

c.width^=0;for(i=2e3;i--;)x.fillStyle=`hsl(`+t*30+`,80%,50%)`,x.fillRect(0,i/2,2e3,S((T(t)*(1e3-i)/500)%360+i/100+S(t)+(i-i%100)*2)/1.5)

Mar 3 2017 4:44 PM UTC

}// 136/140

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hamptonio

remix of d/1830 by u/hamptonio

function u(t) {

w=c.width=1920;for(i=w;i--;){q=0;a=1;b=1;e=1+9*t%9;for(j=99;j--;){q+=a*C(b*(i-w/2)/100);a/=2;b*=e};x.lineTo(i,200*(2.5-q));x.stroke()}

Mar 3 2017 3:48 PM UTC

}// 135/140

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Animation of Weierstrass's 1872 example of a continuous function that becomes nowhere-differentiable when b>=7.

u/donbright

very interesting!!!! always felt like demoscene is a gateway to math

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hamptonio

function u(t) {

t?i++:i=0;q=0;a=1;b=1;for(j=99;j--;){q+=a*C(b*i/100);a*=.6;b*=8};x.lineTo(i,250*(2+q));x.stroke()

Mar 3 2017 3:31 PM UTC

}// 97/140

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From 1872, Weierstrass's first example of a continuous but nowhere-differentiable function.

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