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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metamero

function u(t) {

c.width^=0
p=Math.PI
r=300
for(i=0;i<8;++i){
  x.beginPath()
  x.arc(960+C(1.9*C(t)*t+i*p/4)*r,540+S(S(t)*t+i*p/4)*r,r/4,0,2*p)
  x.fill()
}

Nov 14 2018 2:12 PM UTC

}// 140/140

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circular movement

u/joeytwiddle

circles moving in circles?

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metamero

remix of d/888 by u/jczimm

function u(t) {

c.width^=3330;
for(i=0;i<300;i++)
  for(j=0;j<6;j++)
    x.fillRect(960+800*C(i)*C(T(t/5.1)+j/i),540+400*S(i*2),10,10)

Nov 14 2018 12:11 PM UTC

}// 118/140

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and3k5

function u(t) {

c.width^=0
x.font="10em s"
s=t*100;
w=1720
h=880
x.fillText("📀",Math.abs(s%w*2-w),150+Math.abs(s%h*2-h))

Nov 13 2018 6:18 AM UTC

}// 104/140

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waiting for that disk to hit the corner perfectly

u/pavel

I wish I could click it and it split into two :)
u/sigveseb

Haha nice
u/joeytwiddle

#bounce

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rodrigo.siqueira

remix of d/10993 by u/rodrigo.siqueira

function u(t) {

x.stroke()
x.arc(940-S(t*3)*640,540-C(t*2)*340,120,0,6)

Nov 16 2018 12:44 AM UTC

}// 55/140

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Tubular Bells

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Xen

function u(t) {

for(a=c=b="";a++<81;b+=a%9?" . ":"\n",a%9?0:c++)b+=(a+c)%9+1;throw b

Nov 15 2018 7:55 PM UTC

}// 68/140

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Simple Latin Square, Shoutz to u/rnbw for the idea

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jonathan-potter

function u(t) {

N=t%32
P=c.width=128
for(k=0;k<N;k++) {
 for(n=0;n<N;n++) {
  s=6.28*k*n/N
  x.fillStyle=R(P*C(s),P*S(s))
  x.fillRect(k*2,n*2,2,2)
 }
}

Nov 12 2018 6:28 PM UTC

}// 136/140

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#dftmatrix Fourier Transforms make me happy. red=real, green=imaginary

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MAxSaL

function u(t) {

o=100;for(i=0;i<200;i++){x.fillStyle=R(S(t*3)*t*5,S(t*3)*o,o+i*S(t*C(t+3)));x.fillRect(10*i,t*o,o,-o+i*S(t*S(i*3)))}

Nov 14 2018 10:57 AM UTC

}// 116/140

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No clue.

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veubeke

remix of d/10949 by u/veubeke

function u(t) {

for(i=12;i--;)
x.shadowBlur=200+S(_=t-i/4.5)*160,
x.shadowColor=`hsl(${S(_/2)*200},99%,50%)`,
x.fillRect(960-(w=89*i),540-(h=50*i),w*2,h*2)

Nov 13 2018 5:14 PM UTC

}// 139/140

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and3k5

function u(t) {

x.font="12em s"
x.fillText("😄",960+S(t*32)*1060,560+C(t*51)*560)
d=c.width/c.height;
x.drawImage(c,-4*d,-4,c.width+8*d,c.height+8);

Nov 13 2018 6:07 AM UTC

}// 131/140

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smileys!

u/katkip

Where did you get the idea from?
u/and3k5

Boredom

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anotherkitten

function u(t) {

with(x)for(c.width|=j=0;j++<4;stroke()){f=(lineWidth=8-(t+j*2)%8)**4;beginPath();for(i=0;i++<6;)lineTo(960+S(a=t+i+j**2)*f,540+C(a)*f)}

Nov 13 2018 5:38 AM UTC

}// 135/140

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you guys ever play super hexagon?

u/rnbw

yeah!! (i mostly played the open source clone of it, though. gimmicky af, but really cool. made a few level packs for it actually)