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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veubeke

function u(t) {

c.width^=0
for(i=3;i--;)
$=i<2,s=16+$*(S(t/2)*(10-i*20)),x.font=s+'em"',
x.fillText(['🌷','🌻','🌧️'][i],1260-600*($?i:C(t/2)<0)-8*s,$?900:400)

Feb 10 2020 12:49 PM UTC

}// 140/140

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#growth

u/tomxor

#cute :D

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Xen

remix of d/17569 by u/andrea270872

function u(t) {

c.width=69
d=x.getImageData(0,0,69,39)
D=d.data
for(i=D.length;i--;D[K+1]=255)D[K=i*4+2]=255*S(i*K+t*7)
x.putImageData(d,0,0)

Feb 11 2020 8:31 PM UTC

}// 125/140

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paint by colors with a Vengeance

u/andrea270872

nice pattern

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BevisHalPerry

function u(t) {

for(i=0;i<1000;i++)
r = Math.random()*1000
x.rotate(10)
x.fillStyle=R(r)
x.beginPath()
x.fill(x.arc(960+r, 540, (t*3)%i*10%r, r, 2*Math.PI))

Feb 12 2020 3:39 PM UTC

}// 140/140

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u/lionleaf

Nice first dweet! Welcome! :)

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rodrigo.siqueira

remix of d/17579 by u/pavel

function u(t) {

c.style.filter=`blur(.2vh)sepia()hue-rotate(${t*5}rad)invert(`
for(c.width=198,k=99;k=--k;x.arc(99,56,k*k,a=t*k,a));x.stroke()

Feb 12 2020 3:29 PM UTC

}// 126/140

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Polygonal spiral #hypnotic

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bandaloo

function u(t) {

x.font=`174px'`;x.fillStyle=R(x.fillText((C()+" "+{}.z+" "+1/0+" "+typeof{}).toLowerCase(),-85,t**18),t**14)

Feb 12 2020 12:51 AM UTC

}// 108/140

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(n)an undefined infinity object

u/bandaloo

i'm sure somebody else can be more clever about this. still not shorter than the string "an undefined infinity object" but that's not really the point
u/pavel

You can do [C(),''+u.z,1/0,typeof{}].join` ` to save two chars

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andrea270872

function u(t) {

x.strokeStyle='#2615'
x.lineWidth=.1
for(i=480;i-->0;x.beginPath()){x.arc(i%30*65+C(t),20+i*2.2,((t+i**.33)%6)**2,0,7);x.stroke()}

Feb 10 2020 7:29 PM UTC

}// 130/140

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Petri Dish growth v0.6

u/andrea270872

Wrong caption... :( Petri Dish growth 0.7 (green alga wall)
u/Xen

#growth nice style!

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andrea270872

function u(t) {

x.strokeStyle='#531'
x.lineWidth=C(t*7)
for(i=12;i-->0;x.beginPath()){x.arc(i*170+13*C(t),i%3*460,((t+i)%4)**4,0,7);x.stroke()}

Feb 10 2020 6:53 PM UTC

}// 127/140

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Petri Dish growth v0.6

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New_Core

function u(t) {

t?0:a=[]
for(i=9;i--;)a.push(~~(Math.random()*300)),x.fillRect(960+(b=99+(a.filter(i=>i===(d=a[a.length-1])).length)*9)*S(d),540+b*C(d),9,9)

Feb 9 2020 8:47 PM UTC

}// 140/140

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#growth

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andrea270872

remix of d/17568 by u/andrea270872

function u(t) {

c.width=99
d=x.getImageData(0,0,40,30)
D=d.data
for(i=D.length;i-->0;D[K+2]=255)D[K=i*4+1]=255*S(t+i**2)
x.putImageData(d,24,9)

Feb 11 2020 7:28 PM UTC

}// 127/140

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paint by colors 2 - kryptonite

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andrea270872

function u(t) {

c.width=48
d=x.getImageData(0,0,48,27)
D=d.data
for(i=D.length;i-->0;D[K+3]=255)D[K=i*4]=S(t*i)*255
x.putImageData(d,0,0)

Feb 11 2020 7:17 PM UTC

}// 121/140

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paint by colors ;)