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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FloppyDiskO

function u(t) {

c.width=1920;v=Math.random()*255%255;x.fillStyle=R(v,v,v,v/100);for(i=0;i<99;i++)x.fillRect(Math.random()*2000,Math.random()*i/v*v*33,2,i);

Aug 18 2021 9:42 PM UTC

}// 139/140

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Rain

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ArthurThuczsec

remix of d/5405 by u/M1T0

function u(t) {

for(t?i=t|0:c.width=350;i--;x.fillStyle=`hsl(${t*i},90%,50%,.01)`)x.fillRect(i*C(t^i),i*S(t&i),i,i)

Aug 19 2021 9:08 PM UTC

}// 99/140

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Slowly... it happens!

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rodrigo.siqueira

remix of d/23566 by u/rodrigo.siqueira

function u(t) {

for(c.width=i=320;i--;)for(H=181;H--;x.fillRect(i,H,1,1))Y=H/47-2,r=((X=i/54-3)*X+Y*Y-1)/99,x.fillStyle=R(K=S(Y/r|X/r+t*99)*H+1/r,K/5)

Aug 16 2021 7:22 PM UTC

}// 134/140

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Sierpinksi solar flare #eclipse #sierpinksi

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lerc

remix of d/20904 by u/lerc

function u(t) {

eval(unescape(escape`𭁼𯀨𨰮𭱩𩁴𪀽𝀰𜀩𒡬👡🐾𚁸𛡤𬡡𭱉𫑡𩱥𚁣𛀭𭰬𛑨𚐬𤰨𭀪𨐩𚰱𚐊𮀮𬱥𭁔𬡡𫡳𩡯𬡭𚁁🐱𛠰𜐬𠠽𛠰𜐬𛑂𛁁𛁷🐲𜀰𚱓𚁴𚐪𚁑🐴𜀩𛁨🐹𞐫𠰨𭀩𚡑𚐊𮀮𩡩𫁬𤱴𮑬𩐽𤠨𜀬𜀬𪀪𫀨𜐮𝐩𚐊𮀮𩡩𫁬𤡥𨱴𚁵🐨𫀨𜠮𜐩𛑬𚀱𚐩𚡑𛀭𭐬𝀬𝀩𒠻`.replace(/u../g,'')))

Aug 16 2021 1:49 PM UTC

}// 135/140

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Night Flight

u/rep_movsd

The initial part looks like a rock

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FloppyDiskO

function u(t) {

c.width=1920;for(y=t%6*20*-1/0.2;y<c.height;y+=10){x.moveTo(0,y);x.lineTo(c.width,y);x.moveTo(y+200,0);x.lineTo(y+y,1100);x.stroke();}

Aug 19 2021 11:55 AM UTC

}// 134/140

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Moiré Pattern

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danny@hille.dk

remix of d/23526 by u/danny@hille.dk

function u(t) {

eval(unescape(escape`󨼮󭽩󩍴󪌽󭼽󞜹󞽦󫽲󚍭󟜶󩜳󞽭󛜭󞽸󛭦󪝬󫍓󭍹󫍥󟝒󚍲󟝢󚬹󚽓󚍡󛼹󚜪󤼨󨬯󞌫󭌪󞜫󪼩󚭷󛍲󚬮󝜩󚝸󛭦󪝬󫍒󩝣󭌨󨜽󫜥󭼬󨬽󫜯󭽼󜌬󜬬󜜭󚌨󦜽󛜱󚼲󚭡󛽷󚜪󚍯󟜨󜼭󚌴󛜵󚬨󩜽󚍘󟜱󛜨󪼽󤼨󭌥󜼮󜬩󚜭󜬪󨬯󭼩󚭘󚽙󚭙󚜩󚬪󛬵󚜯󚼫󩜩󚭷󚽴󚭷󙭷󧭘󚭯󚭷󙭷󚜯󭼩`.replace(/u../g,'')))

Aug 16 2021 6:39 PM UTC

}// 140/140

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bug fix & tweek remix

u/danny@hille.dk

#fire #ball #disco #inferno

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ArthurThuczsec

remix of d/16335 by u/katkip

function u(t) {

for(j=i=199;i--;x.fill())x.beginPath(x.fillStyle=R(j+S(q=t*t+i)*j,i,j-C(-q)*j,.02)),x.arc(960+S(t*77)*i*9,540+C(t*33)*i*9,j-S(t*t-i)*i,0,t)

Aug 18 2021 5:54 PM UTC

}// 139/140

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mxfh

remix of d/23551 by u/mxfh

function u(t) {

I=new ImageData(w=2048,w)
b=new Int32Array(I.data.buffer)
for(i=3e6;i--;b[i]=(i-Y&Y+i)*-t/i%i<<22)Y=i*w
x.putImageData(I,0,0)

Aug 15 2021 2:06 AM UTC

}// 125/140

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https://www.dwitter.net/d/23557 so with some space for setting up other buffer view, it speeds things up when treating rgba Uint8Clamped Array as single 32bit value

u/mxfh

wondering if we could store that buffer somwhere to do truly iterative fractal stuff
u/taupelink

trippy!

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taupelink

remix of d/23515 by u/taupelink

function u(t) {

for(i=q=65;--i;x.fillRect(3*q/X,720-q/Y,-i*q*v,i*i*Y*v))f=i*t,X=f*f%1,Y=X*f%2-1,x.fillStyle=R(q/=1+S(q/X),q=q%9*i,q+=i/Y/2,Y*Y/q*50),v=.6**t

Aug 17 2021 1:39 AM UTC

}// 140/140

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d/23574

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rodrigo.siqueira

remix of d/23562 by u/rodrigo.siqueira

function u(t) {

for(c.width=i=320;i--;)for(H=181;H--;x.fillRect(i,H,1,1))Y=H/65-1.4,r=((X=i/73-2.2)*X+Y*Y-1)/80,x.fillStyle=R(K=T(Y/r|X/r+t*700)*3,0,1/r)

Aug 16 2021 1:57 PM UTC

}// 137/140

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Black hole in the Sierpinksi universe #sierpinksi