Dweets awesomed by u/joeytwiddle

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: #Food

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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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anotherkitten

function u(t) {

t=S(t)*1.7;for(c.width|=j=0;j++<9;)for(h=5;h-->-4;)for(i=5;i-->-4;x.fillRect(958+h*m*t-j*4,538+i*m*t-j*4,m+4,m+4))m=8*j,x.fillStyle=R(m,m*2)

Nov 13 2018 4:10 AM UTC

}// 140/140

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diced

u/aleamb

amazing!
u/joeytwiddle

Nice! Small tweak, just swinging left and right: for(c.width|=j=0;j++<9;)for(h=5;h-->-4;)for(i=5;i-->-4;x.fillRect(958+h*m*2-j*4+m*9*S(t),538+i*m*2-j*4,m+9,m+9))m=8*j,x.fillStyle=R(m,m*2)

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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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veubeke

function u(t) {

x.shadowBlur=200+S(t)*160
for(i=12;i--;x.fillRect(960-w/2,540-h/2,w,h))x.shadowColor=`hsl(${S(t/2-i/9)*200%360},99%,50%)`,w=178*i-20,h=100*i

Nov 12 2018 8:43 PM UTC

}// 140/140

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u/joeytwiddle

Launch when ready

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jonathan-potter

function u(t) {

N=t%32
P=c.width=128
for(k=0;k<N;k++) {
 for(n=0;n<N;n++) {
  s=6.28*k*n/N
  x.fillStyle=R(P*C(s),P*S(s))
  x.fillRect(k*2,n*2,2,2)
 }
}

Nov 12 2018 6:28 PM UTC

}// 136/140

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#dftmatrix Fourier Transforms make me happy. red=real, green=imaginary

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Xen

remix of d/10945 by u/pavel

function u(t) {

t?x.strokeRect(Z=1e3+C(t)*299,t%1<.5?500+S(t)*399:500+S(t*2)*159,9,9):x.fillRect(0,0,2e3,2e3,x.fillStyle="red")

Nov 12 2018 1:08 PM UTC

}// 111/140

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u/iverjo

Spiderman?
u/joeytwiddle

Yep, that's #spiderman :-D

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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

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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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veubeke

remix of d/10932 by u/veubeke

function u(t) {

for(c.height=i=$=960;i--;x.fill(new Path2D('M0 2C8-5,8 8,0 0')))x.setTransform(C(X=(Y=i*9+t)*i/$)*(_=(5+i%5)*(8-C(X))/9),0,0,_,S(X)*$+$,Y%$)

Nov 11 2018 6:34 PM UTC

}// 140/140

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katkip

function u(t) {

c.width*=1;for(i=9;i--;)(p=q=>x.fillRect(400-q+q*100+S(t)*300,400,50,200),p(i));x.fillStyle='#444';for(i=S(t)/7;i<8.5;i++)p(i+S(t)/9)

Nov 11 2018 11:01 AM UTC

}// 133/140

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Another method to create a 3D #default . #d3

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pavel

function u(t) {

p=i=>99*[0,0,3-i,1,6-i,2,i-5,i-7][~~i]
for(c.width|=t%=i=8,x.rotate(.8);i--;m+7&7&&x.fillRect(p(m?i:t)+904,p(m?6-i&7:8-t)-460,90,90))m=~~t-i

Nov 10 2018 7:44 AM UTC

}// 140/140

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This really wants to be faster but I'm out of bytes!

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u/jylikangas

This is challenging stuff!
u/Xen

137: p=i=>99*[0,0,3-i,1,6-i,2,i-5,i-7][~~i] for(x.rotate((c.width|=t%=i=8)/9);i--;m+7&7&&x.fillRect(p(m?i:t)+904,p(m?6-i&7:8-t),90,90))m=~~t-i
u/jylikangas

Full speed 138: p=i=>99*[0,0,3-i,1,6-i,2,i-5,i-7][~~i] for(c.width|=i=8,x.rotate(7);i--;m+7&7&&x.fillRect(p(m?i:T=t*5%8)+700,p(m?6-i&7:8-T),90,90))m=~~T-i
u/pavel

Nice! There is some flicker but you saved enough bytes to fix p=i=>99*[0,0,3-i,1,6-i,2,i-5,i-7][~~i];for(c.width|=i=8,x.rotate(7),T=8*t%8;i--;m+7&7&&x.fillRect(p(m?i:T)+450,p(m?6-i&7:8-T),90,90))m=~~T-i
u/jylikangas

This was fun. I also tried two totally different implementations but it seems your approach is the best.
u/katkip

Haha that's fun

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