Dweets by u/f8f82804

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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #ScaryMovies

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f8f82804

function u(t) {

x.lineWidth=4
t||x.strokeRect(712,492,496,96)
x.fillStyle=`hsl(${t}rad 90% 50%)`
x.fillRect(720+120*(t%4),500,2,80)

Jul 23 2019 4:38 PM UTC

}// 115/140

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#rainbow #progress -- inspired by https://reddit.com/r/oddlysatisfying/comment…

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f8f82804

remix of d/13115 by u/Xen

function u(t) {


x.fillText(code,c.width=-1,9);

Apr 9 2019 5:05 PM UTC

}// 32/140

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#32bytes #dwitterquine

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f8f82804

function u(t) {





x.font=(c.width|=0)/22+'px 🇪🇺'
f=y=>s=>x.fillText(s,960-x.measureText(s).width/2,y)
f(420)`COPYRIGHT NOT DETECTED`
f(666)`Article 13`

Mar 26 2019 7:49 PM UTC

}// 138/140

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🇪🇺

u/katkip

sad

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f8f82804

remix of d/12681 by u/f8f82804

function u(t) {

eval(unescape(escape`景爨椽ㅥ㐻椭ⴻ砮灵瑉浡来䑡瑡⠮⸮畛稽椥㉥㍝㴨畛穝籼孮敷⁉浡来䑡瑡⡕楮琸䍬慭灥摁牲慹⹯昨稯㠬〬戽爨⤪㈵㔬㈵㔩ⰱ⤬稬截㑝⤮浡瀨⡶ⱪ⤽㹪㽶⬲ⴴ⩲⠩㩶⤩⥲㵍慴栮牡湤潭`.replace(/u(..)/g,"$1%")))

Mar 7 2019 6:52 PM UTC

}// 127/140

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I see a 3x speedup using putImageData over fillRect

u/f8f82804

for(i=1e4;i--;x.putImageData(...u[z=i%2e3]=(u[z]||[new ImageData(Uint8ClampedArray.of(z/8,0,b=r()*255,255),1),z,b*4]).map((v,j)=>j?v+2-4*r():v)))r=Math.random

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f8f82804

remix of d/12670 by u/f8f82804

function u(t) {

for(r=Math.random,i=1e4;i--;x.fillRect(p[0]+=2-4*r(),p[1]+=2-4*r(),1,1))p=u[z=i%2e3]=u[z]||[a=z,b=r()*1080,R(a/8,b/4)],x.fillStyle=p[2]

Mar 7 2019 6:30 PM UTC

}// 135/140

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drawing smaller points doesn't help; this suggests the overhead is in color parsing

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f8f82804

remix of d/12658 by u/qm3ster

function u(t) {

for(r=Math.random,i=1e4;i--;x.fillRect(p[0]+=2-4*r(),p[1]+=2-4*r(),2,2))p=u[z=i%2e3]=u[z]||[a=z,b=r()*1080,R(a/8,b/4)],x.fillStyle=p[2]

Mar 7 2019 12:16 AM UTC

}// 135/140

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A little golf and a color tweak to get some room to play with performance. it seems like the limit is just in drawing; Math.random() seemingly can't be improved on. I'd like to look at putImageData as suggested by https://stackoverflow.com/a/4901604 because it's possible that color parsing is a big overhead cost.

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f8f82804

remix of d/12295 by u/f8f82804

function u(t) {

with(x)for(c.width|=0,scale(9,9),i=12;j=i--*1.57;beginPath(fill()))arc(107+45*C(A=j-t+i/2),60+45*S(A),14,(a=(t+j)%6)-2,a)

Feb 11 2019 9:49 PM UTC

}// 121/140

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#crab #dance

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f8f82804

remix of d/12261 by u/due

function u(t) {

for(c.width|=p=6.2832,x.scale(9,9),x.lineJoin='round',i=13;j=i--*p/4;x.arc(107+45*C(A=j-t+i*p/12),60+45*S(A),14,(a=(t+j)%p)-1,a));x.stroke()

Feb 11 2019 5:56 PM UTC

}// 140/140

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remixed with cleaner line joins

u/rnbw

reminds me of kanizsa's triangle for some reason

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f8f82804

remix of d/12142 by u/f8f82804

function u(t) {

with(x)t||fillRect(t,t,a=5e3,a),setTransform(9,0,0,9,960,540),rotate(w=t&&w<a?w+2.4:1),fillStyle=`hsl(${t}rad 95% 50%`,fillRect(w**.5,0,2,2)

Feb 4 2019 7:57 PM UTC

}// 140/140

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#rainbow #phyllotaxis with #squares -- thanks to u/pavel

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f8f82804

remix of d/12080 by u/stellartux

function u(t) {

with(x)setTransform(u=30*C(w=t&&w<469?w+2.4:1),v=30*S(w),-v,u,960,540),beginPath(),fillStyle=`hsl(${t}rad 95%50%`,fill(arc(w**.5,0,1.2,0,7))

Feb 4 2019 5:33 PM UTC

}// 140/140

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#rainbow #phyllotaxis

u/f8f82804

I'd wanted to do this without any trig, using rotate() and save()/restore(), but it was about 4 bytes too long.
u/pavel

135 with(x)setTransform(30,0,0,30,960,540),rotate(w=t&&w<469?w+2.4:1),beginPath(fillStyle=hsl(${t}rad 95% 50%),fill(arc(w**.5,0,1.2,0,7))

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