Dweets awesomed by u/metamero

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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metamero

remix of d/888 by u/jczimm

function u(t) {

c.width^=3330;
for(i=0;i<300;i++)
  for(j=0;j<6;j++)
    x.fillRect(960+800*C(i)*C(T(t/5.1)+j/i),540+400*S(i*2),10,10)

Nov 14 2018 12:11 PM UTC

}// 118/140

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and3k5

function u(t) {

x.font="9em s"
x.globalCompositeOperation="xor"
s=t*100;
w=1420
h=880
a=Math.abs
x.fillText("And3k5",a(s%w*2-w),150+a(s%h*2-h))

Nov 13 2018 11:54 PM UTC

}// 128/140

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Smeary ugly/unreadable text

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pavel

function u(t) {

s=t?s:new Date;c.width|=0;x.font='8em"';['t',t,'system clock',w=(new Date-s)/1e3,'ratio',t/w].map((s,i)=>x.fillText(s,i%2*800,(2+i>>1)*99))

Nov 13 2018 10:06 PM UTC

}// 139/140

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Animation slowdown detector (does not handle pausing)

u/pavel

I've noticed animations being slower on my iphone. This dweet shows a ratio of 1 on my macbook but 0.558 on my phone!
u/pavel

This is a Safari issue; runs at .558 on phone and mac. Mac Chrome runs at 1.
u/prplz

Same result on my iPhone/safari too
u/magna

See also d/3307
u/katkip

Mine is 1.1 on pc

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and3k5

function u(t) {

c.width^=0
x.font="10em s"
s=t*100;
w=1720
h=880
x.fillText("📀",Math.abs(s%w*2-w),150+Math.abs(s%h*2-h))

Nov 13 2018 6:18 AM UTC

}// 104/140

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waiting for that disk to hit the corner perfectly

u/pavel

I wish I could click it and it split into two :)
u/sigveseb

Haha nice
u/joeytwiddle

#bounce

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pavel

function u(t) {

with(x)for(k=n=j=255;j--;k=2,fill())for(beginPath(fillStyle=R(T=(t^k)%2*128,T,i=4));i--;)arc((j%9-t%1)*n+T,(j>>4)*n+T,64*k,a=(i-t%1)*11/7,a)

Nov 13 2018 2:29 AM UTC

}// 140/140

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u/yonatan

arc?!
u/anotherkitten

oh you sly dog very well done
u/pavel

:)
u/jylikangas

Very cool! You can save 3 bytes by removing the unnecessary %1 from t when calculating a and also doing <<7 instead of *128. If someone is wondering how this works using a+1 instead of a at the end may help. :)
u/katkip

#beesandbombs
u/pavel

Removing %1 at the end breaks the animation on my iPhone.

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jonathan-potter

function u(t) {

c.width=960
f=(o,l,X=480,Y=270)=>{if(l>1){
x.fillRect(X,Y,2,2)
f(o+t*.1,l*.6,X+=l*C(o),Y+=l*S(o))
f(o-t,l*.75,X,Y)}}
f(t,99)
f(t+3,60)

Nov 12 2018 10:57 PM UTC

}// 134/140

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felt like doing some #selfsimilarity #recursion

u/katkip

cute #fractal

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pavel

function u(t) {

for(d=t<8,n=i=256;i--;x.fillRect(d?9*i:855+n*i*(i<2),!d*300,50,d?4:50))x.fillStyle=R(C((t|Math.abs(i-107))**.5*t)<0&&n)
x.drawImage(c,0,d*4)

Nov 12 2018 3:19 AM UTC

}// 140/140

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Demon

Show more comments…
u/magna

Amazing!
u/iverjo

Spot on!
u/katkip

nice idea
u/ndr3w221

this is awesome!
u/and3k5

i did not expect the last bit! scary!
u/aleamb

great! #waitforit
u/lionleaf

Amazing #demon

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logistikalism@gmail.com

function u(t) {

t*=Math.random()
x.arc(960,540,540-t,t,t-90)
x.stroke()
throw t

Nov 12 2018 2:04 AM UTC

}// 63/140

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anotherkitten

function u(t) {

e=(a,b)=>a/b&1?b-a%b:a%b;x.fillRect(0,0,j=2e3,j);x.globalAlpha=.1;for(;j--;x.clearRect(e(t*360*S(b),1911),e(t*360*C(b),1071),9,9))b=j/1200

Nov 9 2018 6:36 PM UTC

}// 138/140

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faster and cleaner version of linear ripple

u/katkip

I love this one!
u/iverjo

#waitforit

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pavel

remix of d/9174 by u/f8f82804

function u(t) {

with(x)for(N=i=300;A=S(a=i--/99);beginPath(fillStyle=`hsl(${i*N} 90% ${c**4}%`))c=A*S(b=t+i)+2,fill(arc(N*c,N*(A*C(b)/2-C(a)+2),70*A+9,0,7))

Nov 8 2018 11:00 PM UTC

}// 140/140

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u/katkip

I like the fact that it is so fast
u/iverjo

Nice! This reminds me of the spinning beachball of death (on Mac OS X)
u/aleamb

#colors #d3 #sphere
u/pavel

#uncompressed

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