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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Agnes

function u(t) {

q=5*(1+C(t));for(i=c.width=c.height=100;i--;)for(j=100;j--;)with(x)fillStyle=`hsl(${q*t*(i+1)*(j+1)},50%,50%)`,fillRect(i-q,j-q,2*q,2*q);;

Mar 1 2018 10:06 AM UTC

}// 138/140

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jellyedwards

function u(t) {

c.width|=r=550
with(x)for(j=S(t)/.11;z=j--*35;stroke(),beginPath(),y=r-(1e5-z*z)**.5,lineTo(r+z,y),arc(r,r,z,0,3),lineTo(r-z,y))lineWidth=20

Feb 27 2018 1:01 PM UTC

}// 140/140

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dots and loops album cover (https://en.wikipedia.org/wiki/Dots_and_Loops…)

u/zanella

Do Sgt. Pepper's Lonely Hearts Club Band next. :)
u/jellyedwards

it doesn't fit but I had a go! with(x)for(font="99px a",fillStyle='red',b=0,i=a=80;i--;fillText('BEATLES'[b=i%7],580+a*b,980+i/4))fillText(String.fromCodePoint(i&1?0x1F468+b%2:0x1F9D1,0x1F3FB+i%3),i%20*a,a+5*(i+b))

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akm

remix of d/7083 by u/DirtyDan

function u(t) {

c.width|=i=50
with(x)for(globalCompositeOperation='xor';i--;)beginPath(arc(985+S(a=t*i/17)*700,240+i*t+C(a)*230,i,0,7),i%2?stroke():fill())

Feb 26 2018 11:34 PM UTC

}// 139/140

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dwardu

function u(t) {

x.drawImage(c,0,0,1920,1080,8+16*S(t/5)**2,t%32,w=1888,h=1048)
x.strokeStyle=R(z=255*S(t)**2,z,z)
x.lineWidth=32
x.strokeRect(16,16,w,h)

Feb 28 2018 9:26 PM UTC

}// 136/140

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drawImage() arguments 0,0,1920,1080 may be dropped!

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jylikangas

function u(t) {

c.width=W=800;for(o=9;o--;)for(i=-39;i<39;)for(j=0,X=i++;j<300;j+=45,X/=.8)x.fillRect(o*99+X*S(o+t),99+99*C(o)+Math.atan(i*i/90)*99+j,7,i/7)

Feb 26 2018 6:12 AM UTC

}// 140/140

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Dancing forest. :)

u/lionleaf

Nice! Potential for a great christmas tree when that time comes :D
u/iverjo

#trees

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dwardu

function u(t) {

z=128+128*S(t*15)
x.fillStyle=R(z,z,z,1)
x.fillRect(0,0,20,1080)
x.setTransform(0.99,0,0,1,0,0)
x.drawImage(c,0,0,1920,1080,20,0,1920,1080)

Feb 27 2018 10:29 PM UTC

}// 139/140

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dwardu

function u(t) {

x.setTransform(100,0,0,100,960,540)
x.rotate(t)
x.fillRect(1+S(T(t)*t),2+C(4*t),.05,.05)

Feb 28 2018 9:18 AM UTC

}// 88/140

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DirtyDan

remix of d/7009 by u/DirtyDan

function u(t) {

c.width+=0
with(x)for(globalCompositeOperation='xor',i=1;i++<50;)beginPath(arc(960+S(a=t*i/11)*230,540+C(a)*230,i%5*60,0,7),fill())

Feb 26 2018 8:40 PM UTC

}// 131/140

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dwardu

function u(t) {

r=n=>Math.floor(Math.random()*n)
for(i=0;i<200;i++){z=r(256)
x.fillStyle=R(z,z,z,1)
x.fillRect(r(40)*48,r(22)*48,48,48)}

Feb 27 2018 7:27 PM UTC

}// 120/140

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zanella

remix of d/7069 by u/BuRRak

function u(t) {

t?g?c.width|=g=0:onkeydown=e=>self[e.key]+=10:a=s=k=l=g=m=n=b=v=0;x.fillStyle=R(m-n,m-n,m-n);x.fillRect(s-a,l-k,b-v+10,b-v+10)

Feb 27 2018 6:01 PM UTC

}// 126/140

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Etch a Sketch 2.0: AS - left knob CCW and CW, KL - right knob CCW and CW, G - shake, MN - change color, BV - change pen size

u/zanella

Shouts to u/snydej for the awesome code golf in the original dweet!
u/donbright

amazing