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

remix of d/11448 by u/carolinaphoenix

function u(t) {

for(w=i=c.width|=0;--i;x.fillRect(960+r*C(a=(i+i*5**.5)*Math.PI),540+r*S(a),9,9))r=(i+60*t)%w

Dec 17 2018 8:12 AM UTC

}// 93/140

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Sunflower seeds. The angles are integer multiples of the golden ratio. https://youtu.be/sj8Sg8qnjOg

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pavel

remix of d/11440 by u/jamespwilliams

function u(t) {

for(r=Math.random,i=2;i--;x.fillRect(i*r()*1920&-64,i*r()*1080&-64,s=i?64:2e3,s))x.fillStyle=`hsla(${r()*360},99%,${i*50}%,${i+.01})`

Dec 17 2018 2:34 AM UTC

}// 133/140

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pavel

function u(t) {

with(x)for(j=512;j--;fill())for(beginPath(l=3);l--;arc(325*((j>>6)+j%2/3)+r*S(9*t),j%8*165,r*4,a=(l+j/2%1)*2.09,a))fillStyle=R(r=j&56,r*4)

Dec 17 2018 2:13 AM UTC

}// 138/140

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u/magna

Nice!
u/cantelope

supercool

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pavel

remix of d/11432 by u/pavel

function u(t) {

t?c.width|=0:h=X=Y=99
frame%h-1?0:i=j=t%9
x[f='fillText']('🥕',~x.scale(9,9),h)
x[f]('🐇',X-=i*=X>0|i<0||-.7,Y=--j<Y-h?(i*=.9,j*=-.7,h):Y-j)

Dec 16 2018 4:22 AM UTC

}// 138/140

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u/Xen

never before have i used arm movements and shouting to interact with a dweet!
u/iverjo

#rabbit #carrot
u/13thptr

#emoji

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pavel

remix of d/11426 by u/Quant1um

function u(t) {

t?w=c.width|=onclick=e=>{i+=e.x/7-X/s,j+=e.y/7-Y/s}:s=i=j=X=Y=20
x.fillRect(X+=i*=(i<0?X>0:X<w)||-.7,Y=++j+Y>1e3?(i*=.9,j*=-.7,1e3):Y+j,s,s)

Dec 16 2018 3:34 AM UTC

}// 140/140

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pavel

remix of d/11421 by u/pavel

function u(t) {

for(x.fillRect(0,0,k=2e3,k);j=--k>>6;x.fillRect((i-j+4)*g,(8+C(i/4)*C((t*30-j|0)/4)*3)*g,s=g*g/200,s))i=k%64,x.fillStyle=R(4*i,g=960/(35-j))

Dec 15 2018 10:08 AM UTC

}// 140/140

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u/cantelope

impressive
u/iverjo

#perspective

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pavel

remix of d/11420 by u/cantelope

function u(t) {

j=t?j%6e3:P=[]
for(w=i=150;i--;c.width=-1)P[j++]=[40,8+S(i/4)*C(t*16)*3]
P.map((p,i)=>x.fillRect(w+(i%w-75)*(g=w/p[0]--),p[1]*g,s=g*g/23,s))

Dec 15 2018 7:17 AM UTC

}// 140/140

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u/katkip

#d3 #landscape Nice!!
u/pavel

#uncompressed

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pavel

remix of d/11391 by u/pavel

function u(t) {

for(a=t?b:{8256:1},i=frame%9==1&t<9.5&&(c.width|=b={},2e5);i--;x.fillRect(i&1017,i>>7,8,a[q]*8))k=i%8+5,b[q=i>>3]^=a[q+k%3*128+k/3%3-129|0]

Dec 15 2018 2:32 AM UTC

}// 139/140

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Fredkin Replicator (non-minified version)

Show more comments…
u/pavel

Using div/mod to store 128x128 pixel coordinates in a. 8256=128*64+64 is the middle pixel.
u/pavel

Using frame%9==1 to update the automata once every nine frames. Frames are 1 indexed.
u/pavel

i encodes three variables: lowest 3 bits is neighbor cell 'index', middle 7 is x, and upper 7 is y.
u/pavel

To get neighbor cells I do the div/mod trick on the 'index' but need to exclude (0,0) which has index 4. So I map cell index to i%8+5 which %9 is [5,6,7,8,0,1,2,3]
u/pavel

A cell is 'on' iff the parity of its 'on' neighbors is odd which is the same as the xor of neighbor states
u/pavel

I cheat a little. Y=i>>10 so my rect should use (i>>10)*8 but to save chars I use i>>7. The cells are slightly off-place vertically but its hard to notice.
u/pavel

i&1017 is a mistake, oops, should be i&1016, causes tiny visual glitch. 1016=0b1111111000 which is X*8
u/pavel

#uncompressed

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pavel

function u(t) {

eval(unescape(escape`琿〺愽笱㈳㐲㨱紻楦⡦牡浥┳〽㴰☦晲慭攼㌰⨳㌩笠景爨挮睩摴桼㵢㵻紬焽㉥㐻椽焭ⴾ㸷㭸⹦楬汒散琨㄰⩩ⰱ〪樬㄰ⱡ孱崪㄰⤩景爨樽焥ㄲ㠬欽㤻欭ⴻ⥢孱嵞㵫ⴴ㽡嬨椫欥㌭ㄩ⨱㈸⭪⬨欯㍼〩ⴱ崺〻愽扽`.replace(/u(..)/g,"$1%")))

Dec 11 2018 8:27 AM UTC

}// 137/140

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Fredkin Replicator

u/pavel

Cellular automaton. A cell turns on if it has an odd number of on neighbors and turns off otherwise.
u/pavel

First 32 generations
u/pavel

(starting with one on cell in the middle)
u/lucio

Awesome Numberphile contribution :-)

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pavel

function u(t) {

for(c.width|=i=60,x.scale(5,5);i--;x.ellipse(192,20+o*160,o?60:80,o?30:15,0,a=(i>>1)*(o-.5)*.42+S(3*t)*.7,a+7))o=i+i/2&1
x.stroke()

Dec 11 2018 1:37 AM UTC

}// 131/140

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Twisted Cylinder #beesandbombs

u/pavel

Single stroke call and only ellipse to draw. The lines are canvas connecting the various ellipse draw cal into a single stroke, I just manage the start angles.
u/pavel

o determines which ellipse, 0 is top and 1 is bottom. It goes: top, bottom, bottom, top. Four-cycle to draw two vertical lines and reset. The angle increments every 2 so top and bottom angle is the same.
u/jylikangas

Thanks for writing about the tricks in your dweets.

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