Dweets awesomed by u/DataMeta

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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katkip

function u(t) {

c.width^=d=[];q=50*t|0;for(k=q;k--;)d.push((C(k*k)*3))
for(i in d.sort(g=(a,b)=>a-b))x.fillRect(1920/q*i,540+S(d[i]*d[i]+t)*300,2e3/q,999)

Feb 10 2019 3:10 PM UTC

}// 138/140

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Fluid sin, thx u/Undefined for golf help

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geb

remix of d/12249 by u/pavel

function u(t) {

n=99;for(c.width|=p=710/113,x.scale(9,9),i=n;j=i--*p/n;x.arc(n+15*C(A=t/n+i*p/3),66+15*S(A),n/3,a=(j-t),a+1));x.stroke()

Feb 10 2019 12:48 PM UTC

}// 120/140

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katkip

function u(t) {

t||(X=0,Y=0,v=V=9);c.width^=0;x.fillRect(X,Y,39,39),x.fillRect(X-80,999,200,50),X+=V,Y+=v,Y>979?v=-9:0;Y<0?v=9:0;X<0?V=9:0;X>1890?V=-9:0;

Feb 10 2019 10:13 AM UTC

}// 137/140

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#default pong

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rodrigo.siqueira

function u(t) {

Xp=X=Y=t/800
x.globalAlpha=.1
for(i=2e3;i--;){
X=Xp*Xp-Y*Y+.9*Xp-.6013*Y
Y=2*Xp*Y+2*Xp+.5*Y
Xp=X
x.fillRect(1300+X*820,740+Y*400,2,2)
}

Feb 9 2019 3:14 PM UTC

}// 135/140

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Tinkerbell Map is a chaotic #attractor dynamical system, as described in https://en.wikipedia.org/wiki/Tinkerbell_map

u/rodrigo.siqueira

"Origin of the name: the graphical picture shows a similarity to the movement of Tinker Bell over Cinderella Castle, as shown at the beginning of Disney films."
u/katkip

You can replace Xp with p

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23_Skidoo

remix of d/12194 by u/23_Skidoo

function u(t) {

for(s=24,d=480,i=4e3;i--;f=C(X/d+t/2)/T(Y/d+s)+t,x.fillStyle=`hsla(${S(f/6)*d} 66%${40+S(f*6)*s}%`)x.fillRect(X=i%81*s,Y=~~(i/81)*s,s,s)

Feb 9 2019 5:58 AM UTC

}// 136/140

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pavel

remix of d/12230 by u/pavel

function u(t) {

for(c.width|=p=2*Math.PI,x.scale(9,9),i=13;j=i--*p/6;x.arc(107+45*C(A=j-t/4+i*p/12),60+45*S(A),14,a=(t+j)%p,a));x.stroke()

Feb 8 2019 8:33 PM UTC

}// 122/140

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I like how the corners are "walking"

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katkip

function u(t) {

for(c.width|=i=4;i--;f(960,540,99,i*11))f=(X,Y,s,n)=>s&&x.beginPath()|x.fill(x.arc(X,Y,s*2,0,7))|f(X+S(t+n)*s*3,Y+C(t+n)*s*3,s/2,-t*2)

Feb 8 2019 5:49 PM UTC

}// 134/140

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Thing that rotates #recursive thanks for u/Xen and u/metamero for help with golfing

u/DataMeta

Interesting

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pavel

function u(t) {

for(c.width|=p=710/339,x.scale(i=9,9);i--;x.arc(107+q*C(a=i%2*3+~~T*p),60+q*S(a),60-q,a-=p,a))T=t++/2%3,q=T%1*60
x.stroke()

Feb 7 2019 8:08 PM UTC

}// 123/140

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u/katkip

Nice!

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rnbw

function u(t) {

for(c.width^=i=0;i++<45;)for(j=-6;j++<23;x.fillStyle='#ac6'+(4+(i+j)%2*2))x.fillRect((i*(b=99+C(t)*35))+(a=S(t)*600%b)-500,(j*b)+a,d=b*.9,d)

Feb 7 2019 3:57 PM UTC

}// 140/140

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zooming tiles without transform! doesn't perform very well, though

u/rnbw

(i'm surprised that that hastily-made alpha adjustment worked...)

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ds0

function u(t) {

r=c.width*=1
for(i=9;i--;){Q=4*t+i
x.beginPath()
x.ellipse(r*(i+1)/10,540+300*S(Q),90,Math.abs(90*C(Q)),0,0,6.3)
C(Q)>0?x.fill():x.stroke()}

Feb 7 2019 3:32 PM UTC

}// 140/140

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