Top dweets by u/robbyg

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: #Opposites

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robbyg

remix of d/15668 by u/mildlybean

function u(t) {

for(c.width=X=20;X--;)for(Y=11;Y--;)x.fillRect(X,Y,a=S(X+t-Y),C(Y+t+a))

Sep 12 2019 8:51 PM UTC

}// 71/140

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Beats me. I just thought it looked pretty.

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robbyg

remix of d/15346 by u/robbyg

function u(t) {

P=Math.PI*2
for(y=12;y--;)x.fillStyle=R(0,h=y*20,h),x.fillRect(960+C(n=t/5+P/3*(y/4|0))*300+C(m=P/4*y+t)*200,540+S(n)*300+S(m)*200,4,4)

Aug 9 2019 6:24 PM UTC

}// 135/140

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Golfed and colorized for more visual interest.

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robbyg

function u(t) {

P=Math.PI*2
for(z=3;z--;)for(y=4;y--;)x.fillRect(960+C(n=P/3*z+t/5)*300+C(m=P/4*y+t)*200,540+S(n)*300+S(m)*200,4,4)

Aug 9 2019 1:00 PM UTC

}// 115/140

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Visualizing the paths of the cars on a ride at the local amusement park. 🎠

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robbyg

function u(t) {

c.width|=0
A=(h,v,r)=>x.beginPath(x.fill(x.arc(h,v,r,0,7)))
P=r=>[960+C(z=t*99/r)*r,540+S(z)*r]
A(960,540,50)
A(...P(99),9)
A(...P(250),20)

Mar 18 2019 1:35 PM UTC

}// 139/140

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A fairly inaccurate #orbit thingie.

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robbyg

function u(t) {

c.width|=0
for(r=9;r--;)for(p=50*r/5,q=6.28/p;p--;x.fill(),x.beginPath())x.arc(960+C(z=p*q-t/9)*60*r,540+S(z)*60*r+C(t*4+z*11)*r*4,9,0,7)

Feb 28 2019 2:59 PM UTC

}// 137/140

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(very) loosely based on https://twitter.com/beesandbombs/status/1061…

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robbyg

remix of d/7574 by u/robbyg

function u(t) {

c.width^=0
for(i=h=540;i--;)x.lineTo(960+C(i)*h*S(t-i**4),h+S(i)*h*C(t+i**4))
x.fill('evenodd')

Feb 12 2019 2:55 PM UTC

}// 95/140

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The void is staring back.

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robbyg

function u(t) {

for(h=192;h--;)for(v=108;v--;)x.fillStyle=R(z=~~(h*h-C(t+t)*3*(h|v)+v*v)%255,z,z),x.fillRect(h*10,v*10,10,10)

Feb 1 2019 8:51 PM UTC

}// 109/140

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robbyg

remix of d/8503 by u/robbyg

function u(t) {

X=Y=t;for(i=2e3;i--;x.fillStyle=`hsl(${C(X+Y)*360},50%,50%)`)h=X,x.fillRect(X=950+(S(1*Y)-C(2*X))*440,Y=550+(S(3*h)-C(4*Y))*230,1,1)

Feb 1 2019 4:59 PM UTC

}// 132/140

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Reworked my #attractor based on the excellent examples from @thorbear and @rodrigo.siqueira

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robbyg

remix of d/8103 by u/robbyg

function u(t) {

x.font='2em arial';for(i=63;i--;)x.fillText('◢◣◤◥'[~~(Math.random()*4)],i*32,t*1920)

May 17 2018 9:08 PM UTC

}// 84/140

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#truchet tiles

u/firegodjr

#charmatrix

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robbyg

function u(t) {

w=2e3,x.fillRect(0,0,w,w);for(a=c.d=c.d||[...Array(w)].map((y,i)=>Math.random()*w),i=0;i<w;i++)x.clearRect(a[i]+C(a[i]+t)*15,(i+t*60)%w,5,5)

Feb 1 2018 3:04 PM UTC

}// 140/140

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Remix of https://www.dwitter.net/d/5404 (with a deleted step in between).

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