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.

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tylertoomey

function u(t) {

for(i=0;i<200;i++){
x.fillStyle=`hsl(${200+i/10},50%,${20+100/(200/i)}%,100%)`
x.fillRect(1000+C(t+i)*3*i*(C(t)*2),600+S(t+i)*i*4,10,10) 
}

Jan 5 2020 9:57 PM UTC

}// 139/140

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pavel

function u(t) {

for(i=c.width|=m=0;i--;m=1)x.globalAlpha=.3+m/3,z=C(i*i)-1.07,x.fillRect(m&&960*(z+2-(i**.2+t/3)%4)/z,540-m*32/z,s=m?i%9/z:2e3,32*s)

Jan 3 2020 1:46 AM UTC

}// 132/140

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Train ride

u/KilledByAPixel

👍
u/katkip

#perspective

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hotdogninja76

function u(t) {

c.width|=0
for(j=0;j<5;j++){x.fillStyle="#d"+(2*j)+(1+S(t)+"")[2]
for(i=0;i<1920;i+=10)x.fillRect(i,S(t+j*t+i/100)*500+540,10,50)}

Jan 7 2020 6:52 PM UTC

}// 130/140

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u/Xen

true fact: this is what them aliens2 rifle thingys did on the inside but a few billions times faster!
u/Xen

intensive business for the aliens but thats what you get for standing on the shootie end!!!

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rodrigo.siqueira

remix of d/17068 by u/pavel

function u(t) {

x.globalAlpha=.08
for(i=8;i--;x.stroke())x.beginPath(r=150*2/3*(i>1)),x.arc(960+t*r*C(a=i+t/5),540+t*t*r*S(a)/25,t*200*(i?1/3:1),0,7)

Jan 5 2020 4:22 AM UTC

}// 133/140

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Turning and folding

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robbyg

remix of d/17061 by u/robbyg

function u(t) {

for(c.width|=j=0;j<10;x.fillStyle=R(++j*30))for(i=540;i--;)x.fillRect(Math.acos(C(t+i*.9*j/1000))*520,i*2,i/2.5,2)

Jan 3 2020 7:40 PM UTC

}// 114/140

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u/katkip

fancy

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Jezza

remix of d/17065 by u/Jezza

function u(t) {

c.width|=0
for(i=0;i<t*9;i+=Math.PI/t**.7) {
 x.beginPath();
 x.ellipse(960+C(i)*i*4,540+S(i)*i*4,i**0.5,i**0.5,0,0,2*Math.PI)
 x.fill();
}

Jan 4 2020 2:33 AM UTC

}// 140/140

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katkip

function u(t) {

eval(unescape(escape`𭁼𯀨𩠽𦱝𚐻𩡯𬠨𪐽𫰽𞐹𞱩𛐭𞰩𮱘🐨𬠽𣑡𭁨𛡲𨑮𩁯𫐩𚀩𚠲𩐳𛁙👲𚀩𚠱𩐳𛁒👲𚁸𛡢𩑧𪑮𤁡𭁨𚀩𚐪𞐹𞱦𫱲𚁩𘁯𩠠𩠩𪑦𚀨𚁘𛑩𛡘𚐪𚠲𚰨𦐭𪐮𦐩𚠪𜠩𚠪𛠵🁩𛡒𚱒𚑯🐰𞱩𩠨𫰩𩠮𬁵𬱨𚁻𦀺𦀬𦐺𦐬𤠺𤡽𚐬𮀮𩡩𫁬𚁸𛡡𬡣𚁩𛡘𛁩𛡙𛁩𛡒𛀰𛀷𚐩𯐠`.replace(/uD./g,'')))

Jan 5 2020 4:33 PM UTC

}// 140/140

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a mathematical cow pattern. circles that don't overlap. replace eval with throw to see the code

u/veubeke

With some color: https://www.dwitter.net/d/11225

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Odog8

remix of d/17079 by u/Odog8

function u(t) {

d=2*C(t)**2;c.width=900;for(b=0;b<70;b+=.02)l=[100*S(4.01*b/3+t)*S(b),b],l=[l[0]*C(l[1]),l[0]*S(l[1])],x.fillRect(l[0]+450,l[1]+230,d,d)

Jan 6 2020 2:13 AM UTC

}// 136/140

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fading le ribbon

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Odog8

function u(t) {

c.width=1920;for(b=0;b<40;b+=0.02)l=[3*S(4.01*b/3+t)*S(b),b],l=[l[0]*C(l[1]),l[0]*S(l[1])],x.fillRect(100*l[0]+960,100*l[1]+540,6,6)

Jan 6 2020 1:30 AM UTC

}// 132/140

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le ribbon

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robotman_

function u(t) {

c.width^=0
for(i=0;i<314;i++)x.fillStyle=`hsl(${i},99%,50%`,x.fillRect(960+S(u=t-i/50)*(a=400+50*S(t*3+i)),540+C(u)*a,15,15)

Jan 5 2020 7:30 PM UTC

}// 124/140

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Circular Spiral (I don't know what happened)

u/pavel

http://mathworld.wolfram.com/Torus.html
u/pavel

Look at the parametric equations