Dweets awesomed by u/RomanW

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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New_Core

remix of d/3512 by u/New_Core

function u(t) {

for(c.width|=i=50;i--;x.fillRect(1e3+i*20*S(t+i/99)-i*25,500+i*20*C(t+i/99)-i*25,x.shadowBlur=b=i*50,b))x.shadowColor="#f93",x.rotate(49)

Nov 13 2017 9:29 PM UTC

}// 137/140

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u/magna

Wow!
u/lionleaf

Amazing colours
u/artfarnaa

Spooky cool

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veubeke

function u(t) {

c.width=320
with(Math)for(H=hypot,b=60;b--;)for(a=80;a--;)H($=a-40)<30&&x.fillRect(a*4,b*3,4,H(C(A=atan2(_=b-30,$)*3)+$,_)<26?random()*3:3)

Nov 12 2017 1:10 PM UTC

}// 139/140

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cantelope

remix of d/3432 by u/cantelope

function u(t) {

for(q=99,w=i=2e3;i--;x.fillRect(i%w,Y,q,q))x.fillStyle=`hsla(${i/5},99%,${C(((960-i%w)**2+(540-(Y=i*81%1e3))**2)**(.5+S(t)/9)/q-t*6)*q}%,.1`

Oct 31 2017 5:09 AM UTC

}// 140/140

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mmastrac

function u(t) {

t?0:M=[];for(f=w=62,i=500;i--;)M[i]=x.fillRect(w*(i>>4),w*(i%16),w,w,x.fillStyle=R(e=M[i]))||t?f&&e>(z=M[i+1])?(M[f--,i+1]=e,z):e:i**6%256

Oct 30 2017 6:10 PM UTC

}// 138/140

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Bubble sort visualizer

u/sigveseb

really nice
u/lionleaf

Brilliant
u/katkip

Awesome

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Renaud___

function u(t) {

c.width+=i=0;z=30;for(;i<z*z;i++){s=t-i/9>2?2:t-i/9;s=s>0?s:0;r=(2-s)*z*z/2;v=s/2*z;a=9+r/2+(i%z)*v;b=9+r+~~(i/z)*v;x.fillRect(a,b,v-1,v-1)}

Oct 14 2017 6:16 PM UTC

}// 140/140

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u/cantelope

wat...
u/joeytwiddle

Cute :D
u/sb

I like it

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cantelope

remix of d/3246 by u/cantelope

function u(t) {

for(x.fillRect(0,0,i=(w=960)*3,i);i--;x.clearRect(w+(S(q=i/381+S(t)*2)*Z)/(Z=C(q)*Z-7)*w,540+S(p)*v/Z*w,6,6))Z=C(p=i/63.67)*(v=i%8/8+1)+3

Oct 5 2017 5:53 AM UTC

}// 137/140

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new dweet exporter site https://dweet.net/194/3252

u/innovati

Very nice!
u/cantelope

should probably have done 63.67+t
u/sigveseb

Nice!
u/joeytwiddle

#perspective #dots

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New_Core

function u(t) {

c.width|=V=960,H=560
s=2*C(t)
for(i=21;i--;)Z=S(t)+C(a=i*1.57+t)+4,x.lineTo(V+(S(a)+S(t/3))/Z*V,H+(i%5>1?(1+s):(-1+s))/Z*H)
x.stroke()

Aug 18 2017 10:17 AM UTC

}// 135/140

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#box #3d

u/13thptr

#d3
u/13thptr

#cube

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artfarnaa

function u(t) {

 for (c.width|=a=200;--a;x.arc(960+S(G+t)*400,
 540+C(t+G*1)*400,a%2*137*Math.abs(S(t))*4,0,
 6.2832))x.moveTo(G=a/2|0,0)
 x.fill('evenodd')

Aug 8 2017 1:52 AM UTC

}// 140/140

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Show more comments…
u/kchplr

Great !
u/sigveseb

Awesome!
u/ninerdelta

stupid question, but why c.width|=a=200? I was tinkering with this code and just made it a=200 and the fps drops significantly.
u/kchplr

ninerdelta: I think that the reason is that c.width|=something is not only clearing the canvas but also the 2d context. Without it each iterations keeps adding arcs to the current path, by the 10th frames there are 2000 arcs to redraw, by the 50th frames there are 10000, etc. In a, err, "non-cold golfing codebase" you could avoid this by using beginPath and closePath.
u/kchplr

"cold golfing", superb. I meant code golfing...
u/ninerdelta

ah that makes sense, thanks!
u/donbright

now this is fine work

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New_Core

function u(t) {

c.width|=0;for(i=40;i--;)a=i*50,x.translate(d=960,e=540),x.rotate(S(t)/50),x.lineWidth=10,x.translate(-d,-e/1.05),x.strokeRect(d-a/2,-e,a,a)

May 7 2017 1:25 PM UTC

}// 140/140

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u/MrM@_S

move the a=i*50 into the for loop to save a byte
u/dwitter

not sure if it's a twisting pyramid or a moving hole
u/includeRubiks

so cool!!!!!!!!!

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keithclark

function u(t) {

for(a=c.width|=0,G=36,J=S(t)/4;a--;'p}¶¼<¼¶}p'.charCodeAt(Y*C(t)+G-X*J&15)>>(X*C(t)+Y*J+t*G)%15&1&&x.fillRect(X*G,Y*G,G,G))X=a%53,Y=a>>6

May 3 2017 1:26 PM UTC

}// 138/140

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fullscreen rotozoom

u/joeytwiddle

#spaceinvaders #rotozoom #alien
u/yonatan

3-char shorter transposed bitmap (just posting so I won't forget it): 'ĄǼͶ߿׽ԅØ'

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