Top 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) {

with(x)for(i=24;--i;fill())for(beginPath(n=k=i+2);k--;arc(960,540,i==2?70:50*i,a=Math.PI*(2*k+t)/(n-1),a))fillStyle=R(a=(1-i/23)**2*300,a,a)

Nov 18 2018 10:45 PM UTC

}// 140/140

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Polygons #beesandbombs

u/andregn

You could consider Math.PI = 22/7
u/pavel

When I have chars left I sometimes write out the full precision constants.

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pavel

function u(t) {

for(c.width|=r=i=300;j=i--/46;f(),f(d=1.1+j),f(-d),f(X,d),f(X,-d))s=i?3:9,f=(a=X=S(A=j+3*t),b=C(A))=>x.fillRect(960+r*a-s,540+r*b-s,2*s,2*s)

Nov 8 2018 7:03 AM UTC

}// 140/140

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u/twitter

Ooh, nice! #trigonometry #educational
u/joeytwiddle

#math

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pavel

function u(t) {

for(i=1e4;i--;x.fillRect(660+u+v,220+u-v,32,32))r=(50*i-i*i/200)**.5,u=i/17+r/2*S(a=i/4+32*frame),v=r*C(a),x.fillStyle=`hsl(${a/7},69%,50%`

Dec 5 2021 9:39 PM UTC

}// 139/140

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u/vain

Well done! Try to change "v,32,32" to "v,32,.02" or "v,32,.05" or "32,.2" to archive some interesting effects.
u/KilledByAPixel

you probably already know but you can remove the hsl comas to save a byte hsl(${a/7} 69%50%
u/pavel

That does not work in Safari, the color will always be black.
u/f8f82804

#sphere

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pavel

function u(t) {

c.width|=f=(X,Y,r)=>r>1&&x.moveTo(X+r,Y)+x.arc(X,Y,r,0,7)+f(X+r*C(a=(S(b=5*t)-b)/4),Y,r/2)+f(X,Y+r*S(a),r/2)
f(960,540,270)
x.fill`evenodd`

Oct 13 2021 9:44 PM UTC

}// 139/140

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Some nice math for the 270 initial radius: The half-height is 540, this must equal r+r/2+r/4+r/8+...=r(1+1/2+1/4+1/8+...). Think about the bit in the brackets in terms of pizzas. You have a whole pizza, plus half a pizza, plus a quarter (half the remaining half), plus an eighth (half the remaining), etc. You have two pizzas! So 540=r*2.

u/pavel

Remix of d/11587. I remixed my other remix but that one was boring so I deleted it.
u/ciaccodavide

nice!
u/cantelope

i think about everything in terms of pizzas

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pavel

remix of d/23980 by u/primo

function u(t) {

for(c.width&=i=10368;i--;x.fillRect(i&127,i>>7,f(.6),1))f=n=>6-n*i/3e3-6*n>S(Math.hypot(i/64%2-1,i/5e3-2.2+1/n)*12*n-8*t)?f(n+.02):n/.7-.7

Oct 3 2021 11:54 PM UTC

}// 138/140

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#raytracing z = sin(sqrt(x*x + y*y) - t)

u/pavel

Also a pretty generic ray tracing 'engine.' Change f to trace other things.
u/pavel

Style remix, no idea how the code I'm remixing works yet. It does not look to do ray tracing so its clearly better.
u/primo

The original uses z + ∂/∂y z for saturation, which looks about right tilted at or near ~26.5°.
u/pavel

for(c.width&=i=10368;i--;x.fillRect(i&127,i>>7,f(.7),1))f=n=>(z=5-i/3e3-3*n)>S(Math.hypot(i/64%2-1,i/5e3-n)*9-6*t)?f(n+.03):--z*.4 is a better one, no weird view prism.

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pavel

remix of d/23093 by u/KilledByAPixel

function u(t) {

for(j=c.width|=0;i=--j>>2;x.fillRect(960+7*s/C(a>>=3)+j%4*s,1080,s,9*s*(S(a*a)-1)))s=6e3/i,a=i+60*t,x.fillStyle=R(b=i*.7+j%4*5-a%8*7,b,b)

Jun 29 2021 3:43 AM UTC

}// 137/140

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This too shall pass

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pavel

remix of d/18577 by u/trusktr

function u(t) {

c.parentNode.style='perspective:4in';onmousemove=e=>c.style=`background:tan;transform:rotateY(${e.x-284}deg)rotateX(${160-e.y}deg)scale(.7)`

May 3 2020 2:29 AM UTC

}// 140/140

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Tan plane looking at your mouse

u/pavel

#interactive #mouse
u/pavel

I tried doing this in js but its just too hard to fit!
u/pavel

168 c.width|=onmousemove=e=>T=e;b=.6-T.y/264;e=g=>C(i)*g(1-T.x/264);f=g=>S(i)*g(b)+e(S)*g(b-1.6);for(i=.8;i<6;x.fill(x.lineTo(960+e(C)/z,540-f(C)/z)))i+=1.57,z=(2+f(S))/960
u/pavel

This post looks better with rotation angles divided by 2 but I couldn't figure out how to fit it.

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pavel

function u(t) {

for(c.width=i=640;i--;i&25&&x.beginPath(x.stroke()))X=i+t%1*32-320,r=i&1||-1,z=.8+r/9*S(a=X/69*S(t)),x.arc(320+X/z,180+36*r*C(a)/z,5/z,0,7)

Apr 5 2020 11:21 PM UTC

}// 139/140

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#dna coil

u/katkip

Smooth
u/sigveseb

Warping train tracks

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pavel

function u(t) {

X=450
c.width|=f=(r,a,o)=>r>9?f(r/=2,a-o,-o)+f(r,a,o)+f(r,a+o,-o):(t-=.02)>0&&x.lineTo(X+=r*C(a*=355/339),Y+=r*S(a))
f(Y=1e3,0,1)
x.stroke()

Jan 17 2020 3:27 AM UTC

}// 140/140

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One stroke #sierpinski

u/tylertoomey

Wow, this is phenomenal!
u/katkip

#curve #sfcurve

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pavel

remix of d/13902 by u/KilledByAPixel

function u(t) {

for(c.width|=S*S<2e4|C*C+9*C>55?onclick=_=>v=-20:S=v=m=0,C=64-m++%98,S+=v++,i=3;i--;)x.fillRect(591+!!i*C*25,[S+491,0,720][i],s=i?360:98,s)

May 17 2019 4:24 AM UTC

}// 139/140

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Click to flap #interactive #game

Show more comments…
u/pavel

Should give you plenty of characters for an improved compressed version
u/KilledByAPixel

amazing
u/joeytwiddle

Fantastic!
u/username

well, it is not like Flappy Bird anymore. it is just two squares at the same position all the time instead of tubes at random heights
u/username

and I feel like it is constructed in a way that makes any improvements very hard
u/KilledByAPixel

it's a demake of a demake. some really good ideas though, i've already used them to chip off a few more bites from my version
u/pavel

#physics
u/IV

needs the airwolf theme tune :)
u/pavel

#flappybird

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