Dwitter - javascript demos in 140 characters

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: #Food

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butcherfly

function u(t) {

for(i=0;i<20;i++){
x.fillStyle=R(S(t*i)*255)
x.beginPath()
x.arc(960, 540, 500- 20 * i, 0, 2 * Math.PI)
x.fill()
}

Feb 8 2019 11:43 AM UTC

}// 116/140

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katkip

function u(t) {

a='',s="ȺǹɎȍɎǹ ǴɉǪȿɄǹȰ";for(c of s)a+=String.fromCharCode(c.charCodeAt(0)/5/**/+C(c.charCodeAt(0)+t*2)*2/**/);throw a

Feb 9 2019 11:12 AM UTC

}// 117/140

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find the secret message #interactive

u/joeytwiddle

#puzzle

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New_Core

function u(t) {

for(i=840;i--;)x.fillStyle=`hsl(${(i*S(S(t)*S(t*2+i*.157))*C(i/520)+i*9)/(.05*C(t)+1)},99%,50%`,x.fillRect(i%40*50,~~(i/40)*50,50,50)

Feb 6 2019 12:46 PM UTC

}// 133/140

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ds0

function u(t) {

r=c.width*=1
for(i=9;i--;){Q=4*t+i
x.beginPath()
x.ellipse(r*(i+1)/10,540+300*S(Q),90,Math.abs(90*C(Q)),0,0,6.3)
C(Q)>0?x.fill():x.stroke()}

Feb 7 2019 3:32 PM UTC

}// 140/140

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katkip

remix of d/12244 by u/katkip

function u(t) {

eval(unescape(escape`昽⡘ⱙⱳ⤽㹻楦⡳㸱〩砮扥杩湐慴栨⤬砮汩湥呯⡘ⱙ⵳⼳⤬砮汩湥呯⡘⭳⼲ⱙ⭳⼲⤬砮汩湥呯⡘⵳⼲ⱙ⭳⼲⤬砮晩汬⠩ⱦ⡘ⱙ⵳⼲ⱳ⼲⤬昨堫猯㈬夫猯㈮㔬猯㈩ⱦ⡘⵳⼲ⱙ⭳⼲⸵ⱳ⼲⥽㭦⠹㘰ⰵ㐰ⰵ〰⤻`.replace(/u(..)/g,"$1%")))

Feb 8 2019 5:21 PM UTC

}// 137/140

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A x.fillTriangle would be perfect ;( #recursion Weirdinski triangle

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katkip

function u(t) {

c.width^=0;f=(X,Y,s)=>{if(s>10)x.lineTo(X,Y),f(X+S(t+s)*s/5,Y+C(t+s)*s/5,s/(1.01+t/250))}
x.lineWidth=5;f(960,540,500),x.stroke()

Feb 8 2019 5:04 PM UTC

}// 129/140

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#organic things that does this #recursive

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katkip

remix of d/12241 by u/katkip

function u(t) {

s=123456;c.width*=1;{f=(X,Y,p)=>{S((X&Y)+s*C(s*s))<0?x.fillRect(X,Y+25,30,5):x.fillRect(X,Y,5,25)};for(i=77;i--;)for(j=43;j--;)f(i*25,j*25)}

Feb 8 2019 4:44 PM UTC

}// 140/140

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Seeded maze! 6 digits seed! change the s constant!

u/robbyg

#maze

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vnf

remix of d/12275 by u/katkip

function u(t) {

a=C(t)<.5;s=S(t)<.5;b=480+(a?1:-1)*50+(s?1:-1)*100;y=270+(!s?1:-1)*50+(a?1:-1)*100;x.fillRect(860,440,200,200);x.drawImage(c,b,y,960,540)

Feb 10 2019 4:30 PM UTC

}// 137/140

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f-fractal, slow but gets there eventually #fractal

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rnbw

function u(t) {

for(c.width^=i=0;i++<45;)for(j=-6;j++<23;x.fillStyle='#ac6'+(4+(i+j)%2*2))x.fillRect((i*(b=99+C(t)*35))+(a=S(t)*600%b)-500,(j*b)+a,d=b*.9,d)

Feb 7 2019 3:57 PM UTC

}// 140/140

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zooming tiles without transform! doesn't perform very well, though

u/rnbw

(i'm surprised that that hastily-made alpha adjustment worked...)

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vnf

remix of d/12270 by u/katkip

function u(t) {

x.font='50px monospace',r=Math.random;for(j=100;j--;)i=r()*192|0,j=r()*32|0,x.fillText('EVEX'[r()*4|0],30*i,35*j)

Feb 10 2019 3:43 PM UTC

}// 113/140

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for r/EVEX

u/katkip

um ok