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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Protowalker

function u(t) {

c.width=800;if(t==0){d=-.01;a=0}
z=(o,z)=>{x.beginPath();x.arc(400,250,100,o,z);x.fill()}
z(3,a);z(-a,3);
a+=d;if(-a>1.5|a>=0){d=-d;a+=d}

Jun 15 2018 7:45 AM UTC

}// 137/140

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Pacman. Just a WIP. Need to go to bed.

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magna

remix of d/8576 by u/magna

function u(t) {

onmousemove=(e)=>T=e
x.beginPath(c.width|=0)
for(i=500;--i;)x.arc(S(k=i*(T.x*T.y>>2)/32+t)*C(i)*400+900,C(k)*400+500,19,0,7)
x.fill()

Jun 12 2018 7:43 PM UTC

}// 133/140

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Move mouse to explore patterns! #interactive

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Xen

remix of d/8544 by u/firegodjr

function u(t) {

t?x.drawImage(c,0,3):x.fillRect(0,0,2e3,2e3)
for(Z=i=350;i--;x.fillRect(i*9-C(t+t-S(i/19-t))*Z-Z,0,Z,2-C(t)))x.fillStyle=R(f=S(i+t)*Z,i,f+i)

Jun 11 2018 7:01 PM UTC

}// 140/140

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u/iverjo

Kudos! Interestingly, this looks very different in fullscreen, without the moiré patterns

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Xen

remix of d/8572 by u/firegodjr

function u(t) {

for(c.width|=Z=i=550;i--;x.beginPath(x.strokeStyle=`hsl(${i*t^Z},90%,20%)`))for(j=2;j--;x.stroke())x.lineTo(2e3*j,Z+C(t+i-j*S(t)*2)*Z)

Jun 12 2018 8:43 PM UTC

}// 134/140

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magna

function u(t) {

c.width|=0
x.font='66px"'
for(Y=16;Y--;)for(X=29;X--;)x.fillText([...'🌑🌘🌗🌖🌕'][(S((X&Y)+t*9)+1)*2.5|0],X*66,Y*66+66)

Jun 13 2018 1:08 PM UTC

}// 115/140

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lazyguyy

function u(t) {

                       t*=6.27;a=(2+C(5*t));b=a*S(3*t);a*=C(3*t);x.fillStyle=R(a*100,b*100,255-a*100);x.fillRect(960+a*280,540+b*170,15,15)

Jun 12 2018 2:51 PM UTC

}// 139/140

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simple colorful torus knot

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firegodjr

function u(t) {

x.beginPath()
c.width|=0
x.stroke()
for(i=500;--i;)x.lineTo(S(k=i*400001+t)*C(i)*400+900,C(k)*400+500)
x.fill("evenodd")

Jun 11 2018 3:52 PM UTC

}// 120/140

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Crystalline

u/pythech

Nice! I was having trouble finding a good constant for evenodd
u/Xen

love it
u/DataMeta

Very cool

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firegodjr

function u(t) {

t?0:x.fillRect(0,0,2e3,2e3)
for(i=26;i--;)
x.fillStyle=R(f=S(i+t)*255,f,f),
x.fillRect(i*100-C(t)*300-300,0,50,2)
x.drawImage(c,0,1)

Jun 11 2018 4:33 PM UTC

}// 132/140

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Liquid Steel

u/Xen

nice style

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firegodjr

function u(t) {

c.width=1920
x.lineWidth=.1
for(i=0;i<900;i++,x.stroke(),x.beginPath())for(j=0;j<2;j++)
x.lineTo(1920*j,500+S(t+i+j*S(t/2)*3)*300)

Jun 12 2018 3:03 PM UTC

}// 130/140

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Smooth curves from straight lines

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magna

remix of d/8592 by u/magna

function u(t) {

c.width|=0
x.font='66px"'
for(Y=16;Y--;)for(X=29;X--;)x.fillText([...'🌑🌘🌗🌖🌕🌔🌓🌒🌑'][(S(X/Y+t*9)+1)*4.5|0],X*66,Y*66+66)

Jun 13 2018 1:19 PM UTC

}// 117/140

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