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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KilledByAPixel

remix of d/34022 by u/KilledByAPixel

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*60,1,z/7+.5))for(z=0,j=9;--j;z+=F(Y=t*5/j-z+j,X=i/19/j)*(1-Y%1)+Y%1*F(Y+1))F=Y=>X%1*S(X^Y)+(1-X%1)*S(X-1^Y)

Jun 22 2025 3:16 PM UTC

}// 136/140

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Mountainous ⛰️

u/Joachim

Very impressive!
u/Xen

Top shelf dweet!
u/cantelope

wow. that's neat

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KilledByAPixel

remix of d/34036 by u/KilledByAPixel

function u(t) {

w=c.width|=i=16
with(x)for(rotate(z=95);i--;beginPath(fill(arc(1e3+z*S(t*3),(20*i-t%20-.5)*z-w,z*2.5,0,9))))fillRect(-w,(i*2-t%2)*z-w,6e3,z)

Jun 23 2025 6:58 PM UTC

}// 140/140

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Illusion Redux 👁️

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rodrigo.siqueira

remix of d/34033 by u/KilledByAPixel

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*60,1,z/10))for(z=0,j=9;--j;z+=F(Y=t/j-S(z+j)+j,X=i/20/j)+Y*F(Y)/9)F=Y=>S(X-Y)*C(X+Y)/5+S(X+Y)-S(Y)

Jun 23 2025 3:51 PM UTC

}// 127/140

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Plasma effect #plasma

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KilledByAPixel

remix of d/34034 by u/KilledByAPixel

function u(t) {

w=c.width|=t%=2
for(x.rotate(i=z=95);i--;)x.fillRect(1e3+z*S(t*3.14),(i+t)*z-w,i%2?w:-w,z)

Jun 22 2025 8:37 PM UTC

}// 90/140

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Split Lines Illusion 👀

u/cantelope

not sure i understand the "illusion" part
u/cantelope

nevermind. i looked at the others. looks side-to-side, then up-and-down

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rodrigo.siqueira

remix of d/33918 by u/rodrigo.siqueira

function u(t) {

x.fillRect(u=v=r=t/99-6,0,2e3,2e3)
for(k=i=70;i--;)for(j=k;j--;x.clearRect(980+u*k,540+v*k,2,2))u=C(P=i+v)+5*C(Q=r*i+u/5),v=S(P)+S(Q)*C(t)*5

Jun 21 2025 8:12 PM UTC

}// 140/140

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Orbits over the torus surface #torus

u/Odog8

Amazing!
u/joeytwiddle

donut universe theory

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KilledByAPixel

remix of d/34031 by u/KilledByAPixel

function u(t) {

w=c.width|=t%=4
for(x.rotate(i=z=95);i--;x.fillRect(...i<30?[d=-t*z,i*z*2-d-w,3e3,z]:[i*2125-85e3+b-z*(t>2?2:t),b-w+z*2,z*2,w]))b=t>2&&t%2*z

Jun 22 2025 3:54 PM UTC

}// 140/140

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Edge of Illusion 🧙

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KilledByAPixel

function u(t) {

w=c.width|=t%=4
for(x.rotate(i=z=95);i--;x.fillRect(...i?[d=-t*z,i*z-d-w,3e3,9]:[1e3+b-z*(t>2?2:t),b-w,z,3e3]))b=t>2&&t%2*z

Jun 22 2025 3:49 AM UTC

}// 123/140

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Line Motion Illusion ✨

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rodrigo.siqueira

remix of d/34012 by u/just_me_7k

function u(t) {

with(x)for(k=i=960;--i;m=i+t*k/4|0,fill(arc(k+(r=m%29?1e4/i:2e3/i)*S(m),540+C(m)*r,r/4,0,7)))beginPath(fillStyle=R(i,i/2,2*i))

Jun 20 2025 11:20 PM UTC

}// 126/140

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Vortex tunnel

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KilledByAPixel

remix of d/23348 by u/KilledByAPixel

function u(t) {

for(i=2e3;i--;x.fillRect(i,t*60,F(Y=t/2,X=i/99)*(1-Y%1)+Y%1*F(Y+1),1))F=Y=>X%1*S((a=X|0)*a^Y)+(1-X%1)*S(--a*a^Y)

Jun 20 2025 5:39 PM UTC

}// 112/140

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Tiny Gradient Noise

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rodrigo.siqueira

remix of d/33997 by u/zibx

function u(t) {

c.width=990;for(i=1e4;i--;x.fillRect(P*55-t%12*99+170,q+9*C(P*2-t*6)+260,1,.4))y=i/950,k=S(y*2-t)*3*C(i),e=y/8-11,q=S(y)*k*e,P=(k*k+e*e)**.6

Jun 20 2025 12:48 PM UTC

}// 140/140

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Small sea creature #fish

u/danny@hille.dk

That would be an excellent foe for a SMUP.
u/joeytwiddle

Reminds me of Ynglet