Dweets by u/pavel

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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pavel

function u(t) {

t?x.strokeRect(a+=i=i*.99+C(d=Math.atan2(Y-b,X-a))/5,b+=j=j*.99+S(d)/5,5,5):(c.width=innerWidth,a=b=X=Y=i=j=0,onmousemove=e=>(X=e.x,Y=e.y))

Nov 17 2018 4:11 AM UTC

}// 139/140

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Orbit Decay #interactive

u/pavel

Try to write your name :)
u/katkip

#gravity #psyhics

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pavel

remix of d/10979 by u/cantelope

function u(t) {

for(i=c.width|=h=355/226,x.translate(w=960,540),x.rotate(o=S(t));--i;x.fillRect(S(i+t)*w/z/r,(w-i)/z,s=99/z/z,s))r=S(i%h+h/2),z=4-o-C(i+t)/r

Nov 16 2018 3:21 AM UTC

}// 140/140

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u/cantelope

nicely done :)
u/f8f82804

#d3 #perspective

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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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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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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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pavel

remix of d/10939 by u/veubeke

function u(t) {

for(c.width=2*(n=i=300);--i;x.fill(new Path2D('M0 2C8-5,8 8,0 0')))z=4/(2+C(A=t*i/n+i*i)),x.setTransform(C(A)*z,0,0,z,S(A)*99*z+n,i*i%n+9*z)

Nov 12 2018 1:04 AM UTC

}// 140/140

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u/iverjo

#fish

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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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pavel

remix of d/10922 by u/pavel

function u(t) {

with(x)for(c.width=960,s=270;s>2;stroke())rect(0,0,s*=.618,s),quadraticCurveTo(X=s*(.5+S(t)*.45),s-X,s,s),translate(s,s),rotate(T=S(t)*1.57)

Nov 10 2018 2:33 AM UTC

}// 140/140

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u/jonathan-potter

This is great! I spent some more time trying to use x.scale for sizing to make the math super pretty. It just ended up messier because linewidth needed modification :(

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pavel

remix of d/10921 by u/jonathan-potter

function u(t) {

with(x)for(c.width|=s=347,lineWidth=4;s>2;stroke())rect(!translate(s,s),!rotate(a=1.57*S(t)),s*=.62,s),quadraticCurveTo(X=s*(2+a)/4,s-X,s,s)

Nov 10 2018 1:07 AM UTC

}// 140/140

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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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